Rozprawy doktorskie na temat „Sewage disposal Vietnam Management”

The study took place in Vietnam at Hanoi University of Science in the framework of the DAAD (German Academic Exchange Service) – “An advancement of the German-Vietnamese University partnerships”. The research has been supported by the program: “Wastewater and Solid Waste Management in Provincial Centers” and belongs to its technical component. The present diploma thesis elaborates the current situation of sewage sludge management in Vietnam and is dealing with sludge characteristics from both domestic sewage treatment facilities and septic tanks. During the research, different treatment components and treatment facilities have been analyzed to carry out a comprehensive survey of sewage sludge types. In this thesis, a guideline (draft) was developed as a main result, which can be helpful to bridge the legislative gap for sewage sludge re-use in Vietnam. In conclusion, an integrated concept has been developed, which recommends the application of selected proceeding elements to treat sewage sludge and the further utilization of re-useable materials in agriculture in a controlled and environmentally-safe manner
Die Diplomarbeit wurde im Rahmen des Deutsch-Vietnamesischem Auslandsaustauschprogramms an der „Hanoi University of Science“ verfasst. Dieses Vorhaben wurde unterstützt von dem DAAD (Deutschen Akademischen Austausch Dienst), und ist im technischem Bereich des Programms “Wastewater and Solid Waste Management in Provincial Centers“ einzugliedern. Die vorstehende Diplomarbeit beschäftigt sich mit dem aktuellen Klärschlammmanagement in Vietnam und liefert dabei detaillierte Resultate zu verschiedenen Klarschlammtypen aus kommunalen Abwasserbehandlungsanlagen. Bei den Untersuchungen wurden verschiedene Abwasser- und Klärschlammbehandlungsanlagen untersucht, um einen Überblick zu den gebräuchlichen Behandlungsmethoden in Vietnam zu erarbeiten. Zusätzlich wurden die institutionellen und rechtlichen Rahmenbedingungen überprüft. Der Entwurf einer Verordnung zur Verwertung von Klärschlamm in der Landwirtschaft wurde vorgelegt, um eine bestehende rechtliche Lücke in Vietnam zu schließen. Mit dieser Arbeit wurde ein integriertes Konzept entwickelt, welches mittels verschiedene verfahrenstechnische Elemente den Klärschlamm behandelt und darauffolgend das verwertbare Material in ausgewählten landwirtschaftlichen Flächen in einer kontrollierten und umweltschonenden Weise verwertet

Many complaints were received from the residential area around the Shatin Sewage Treatment Works (STSTW) about the presence of odour. The dominant odour marker H2S was selected to be studied. A review of the odour measurement and sampling methods, together with the specification of the standard limits and health effects were made. The formation process of H2S was investigated and the abatement and control measures in terms of physical, chemical and biological techniques were compared. The monthly rate of H2S emission in the atmosphere was calculated from the soluble sulfide and the measured wastewater flow at the inlet works, primary sedimentation tanks, aeration tanks, and sludge digestive and storage tanks, and the H2S mapping was carried out at the same places. Meteorological data including wind speed, wind direction, temperature and pressure were collected. The effect of temperature and pH on H2S generation is shown, and the effectiveness of odour control and deodourization processes was studied. A Gaussian dispersion model of Industrial Source Complex version 3 (ISC3) was applied in predicting the ground H2S level at various air sensitive receivers in the vicinity of STSTW. None of the places exceeded the recommended H2S concentration of World Health Organization (WHO) and the odour is a localized problem in STSTW of 35% area having H2S ranging in 0.01--‐0.023ppm. Recommendations are suggested in both short-term improvement in operation and maintenance practice and long-term design and construction of sewage treatment facilities.
published_or_final_version
Environmental Management
Master
Master of Science in Environmental Management

This creative nonfiction thesis tells a story of how water turns into waste. With Portland, Oregon as a base, the reader visits a wastewater treatment plant, several buried and lost streams, a high-tech sewage processor, stormwater education classes, a stormwater management conference, several "green" streets, sewage construction zones, and sewage-related parks. The thesis explores how Western sewage systems came to be, and how wastewater management might change in the future.

Thesis (Ph. D.)--West Virginia University, 2008.
Title from document title page. Document formatted into pages; contains viii, 118 p. : ill. (some col.), map. Includes abstract. Includes bibliographical references.

Thesis (MTech (Environmental Management))--Cape Peninsula University of Technology, 2017.
¹Odour nuisance is increasingly becoming one of the major environmental problems in various countries across the world, especially odour associated with wastewater (Alfonsin et al., 2015; Schlegelmilch et al., 2005; Gostelow et al., 2001). As a result, the management of odour from Wastewater Treatment Works (WWTW) has become one of the environmental challenges besetting these facilities in recent times. The dispersion of odour across the physical boundary of wastewater treatment facilities presents not only negative environmental impacts to the natural environment, but also constitute a nuisance to surrounding populations. The Athlone (WWTW) located in the urban City of Cape Town with high demographics and adjacent to sensitive communities is thus not immune to poor air quality associated with WWTW activities (Walton, 2005). The population growth due to rural-urban migration has further put severe pressure on the facility and thus worsening the odour problem in the area. As a result, complaints have been received by the City Council from the surrounding communities over the last 20 years. In response to these complaints, the management of the WWTW introduced an odour management system with a particular focus on the use of a biotrickling filter coupled with the use of odour masking sprays. This management intervention was adopted in order to control the odour emitted to the atmosphere from the facility (WWTW). While these measures are said to reduce the prevalence of odour to the surrounding environment, it was, however, not clear whether or not such management interventions have reduced odour emitted from the treatment plant. This research was premised on two postulations as an approach to analyse the effect of the odour management plan adopted by the Athlone WWTW’s management and these are: 1) the perceived experience of odour by the adjacent neighbouring communities and, 2) the understanding of the inherent atmospheric dynamics (such as wind velocity, atmospheric stability, inversion layer and ventilation) which influence odour dispersal in the area. The research project argues that these two factors should be taken into account to ensure that the management of odour is sustainable. It is within this background that the research aimed at assessing the management of odour at the Athlone WWTW and to find out, if at all, the inherent local atmospheric conditions in the area and views of the surrounding communities are incorporated into the management of odour from the plant. The methodological design adopted in the study was case study approach. However, the atmospheric data (wind speed and direction) was obtained from the South African Weather Service (SAWS). These variables were analysed qualitatively and experimentally by the use of wind diagrams to provide insight on 2atmospheric stability conditions, surface inversion and topographical properties, and how these phenomenon influences odour dispersion. The study also reviewed previous odour management reports produced by the Althone WWTW management. This type of data was finally supported by data collected from the community by means of a community survey, face-to-face in-depth interviews and qualitative observation. Some major findings from the study revealed that the local weather of Athlone influences the dispersion of odour – facilitating dispersion in the summer through high wind velocities, while impeding dispersion during winter due to the presence of atmospheric stability conditions. Prevailing odours in this community has led to a general feeling of displeasure amongst community members especially since the management of the treatment plan does not include the local community in the decision-making process. In spite of these, the facility’s management approach was found to be more of a response driven nature even though it is ranked as a high-risk facility.

[Truncated abstract]This thesis investigates aspects of urban stormwater modeling and uses a small urban catchment (NE38) located in the suburb of Nedlands in Perth, Western Australia to do so. The MUSIC (Model for Urban Stormwater Improvement Conceptualisation) model was used to calibrate catchment NE38 using measured stormwater flows and rainfall data from within the catchment. MUSIC is a conceptual model designed to model stormwater flows within urban environments and uses a rainfall-runoff model adapted to generate results at six minute time steps. Various catchment scenarios, including the use of porous asphalt as an alternative road surface, were applied to the calibrated model to identify effective working stormwater disposal systems that differ from the current system. Calibrating catchment NE38 using the MUSIC model was attempted and this involved matching modeled stormwater flows to stormwater flows measured at the catchment drainage point. This was achieved by measuring runoff contributing areas (roads) together with rainfall data measured from within the catchment and altering the seepage constant parameter for all roadside infiltration sumps. ... The MUSIC model generated future scenario outcomes for alternative stormwater disposal systems that displayed similar or improved levels of performance with respect to the current system. The following scenarios listed in increasing order of effectiveness outline future stormwater disposal systems that may be considered in future urban design. 1. 35% porous asphalt application with no sumps in 2036 2. 35% porous asphalt application with no sumps in 2064 3. 68% porous asphalt application with no sumps in 2036 4. 68% porous asphalt application with no sumps in 2064. Future scenarios using the current stormwater disposal system (with roadside infiltration sumps) with porous asphalt were also run. These scenarios reduced stormwater runoff and contaminant loading on the catchment drainage point however the inclusion of a roadside infiltration sump system may not appeal to urban designers due to the costs involved with this scenario. Climate change will affect the design of future stormwater disposal systems and thus, the design of these systems must consider a rainfall reducing future. Based on the findings of this thesis, current stormwater runoff volumes entering catchment drainage points can be reduced together with contaminant loads in urban environments that incorporate porous asphalt with a stormwater disposal design system that is exclusive of roadside infiltration sumps.

Waste is not only harmful to the environment alone but it is also a threat to human health and as such its proper management becomes critical. This study which adopted a qualitative approach focused on the review of policies for sustainable solid waste management service in Buffalo City Metropolitan Municipality in an effort to seek what the municipality’s Solid Waste Department should consider in ensuring that all the communities live in a litter free, clean and healthy environment, and ensure that such a service is received by all communities within its jurisdiction. The most sustainable solid waste management strategy would be to adopt the solid waste hierarchy of promoting waste minimisation, re-use, recycling, waste treatment and disposal as the last resort.

This project developed a model for effective asset management drawn from successful programs in the United States, Australia, and New Zealand. Asset management practices were examined at the City of Ontario Utilities Department; a medium sized utility, and also at the Rainbow Municipal Water District, a small sized utility. Gaps between the ideal model and the existing practices were investigated.

Thesis (MPA)--Stellenbosch University, 2014.
The asset management process and strategy has been adopted and implemented within the public sector. Although the National Treasury developed the Capital Asset Management Guidelines to assist with the development and implementation of the asset management system the guidelines have received very little attention over the years. The Auditor General’s findings indicate a lack of proper implementation of the asset management process. The study provides a clear indication of the implementation of the asset management process by most government entities, local government municipalities and the public sector. The outcome is that while most entities have made progress with regards to the implementation, much remains to be done. Most entities implement the asset management process selectively. This does not yield positive and sustainable results and they end up abandoning the whole asset management system. The report provides the process of successful development and implementation of asset management, it also indicate that if there are element that are missed or not properly done the process will not yield constant results or performance and the impact on the organization performance will not be positive. The management of the organization must ensure that asset management is aligned with strategic objectives of the organization and performance measurement must be directly linked with asset management, performance measurement should be used to determine progress and implementation. Service level agreements must be established between all relevant departments including the finance department and there must be agreement on the objectives between all stakeholders. The key to proper implementation is the alignment of the asset management process with the strategic objectives of the organization.

On-site sewage systems, such as septic tank-absorption trenches, are used by approximately 20 000 people who live within the catchments that supply Sydney??s drinking water. These systems discharge sewage, treated to varying degrees depending on the system type and level of maintenance, to the environment. This can result in contamination of drinking water supplies if systems are not designed or managed appropriately. The aim of the project was to develop a methodology to define appropriate buffer distances between on-site sewage systems and waterways in Sydney??s drinking water catchments, to ensure the protection of drinking water quality. Specific objectives included: identifying the current status of on-site sewage management; assessing the effluent quality and treatment performance of septic tanks, aerated wastewater treatment systems (AWTS) with disinfection and an amended material sand mound; and development of an appropriate methodology for delineating buffer distances and assessing development applications. Viruses were used as a focus for delineating the buffer distances due to their mobility and robustness in the environment, and the potential health consequences of their presence in drinking water. A Quantitative Microbial Risk Assessment (QMRA) model was developed to calculate the cumulative impact of the on-site sewage systems in the Warragamba catchment based on data from literature and experiments, with consideration of virus loads from sewage treatment plants within the catchments. The model enabled consideration of what was a tolerable impact in terms of the resulting infections within the community. The QMRA the tolerable loads of viruses from the Warragamba catchment were 108 viruses per year in raw water and 104 viruses per year in treated water. A log reduction method was developed to facilitate individual site development assessments. This method was compared to other management approaches to development assessment: fixed minimum buffer distances of 100m, reducing failure rates to zero, and the use of a preferred system. Each of these methods had a limit for how much they could reduce virus loads to the catchment due to either failure or short buffer distances at some sites. While the log reduction method is limited by the failure rates, the method provides a quantitative measure of risk by which maintenance inspections can be prioritised.

The anaerobic digestion of tannery wastewaters was investigated with a view to using this form of treatment in the tanning industry. As these wastewaters are extremely complex and contain high concentrations of both inorganic and organic compounds, the effect of these individual compounds on the anaerobic digestion process was investigated in detail, in order to ascertain the fate of these compounds during the digestion process. The experiments comprising the initial toxicity study were carried out as adaptation experiments using a synthetic wastewater. It was found that the heavy metals such as chrome, aluminium and iron precipitated and accumulated in the sludge bed of the digesters . The soluble ions such as sodium and chloride were not retained and passed through the digesters. Approximately 20 % of the calcium ions were removed through precipitation, with the remainder being present in the digester effluent . Under the anaerobic conditions, ammonification of the organic nitrogen occurred, and influent sulphates were reduced to sulphides . These sulphides were present as either H2S, HS or insoluble sulphides. As these compounds under investigation on caused no inhibition of the anaerobic digestion process at the concentrations found in tannery wastewaters, the anaerobic treatment of these wastewaters appeared to be possible, provided the bacteria were given sufficient time to adapt to the potentially toxic compounds. However, despite the findings of the synthetic study, the successful anaerobic digestion of the tannery effluents could not be achieved. Although the use of acid was found to be essential in order to control the digester pH in the optimum range, the metabolism of the methanogenic bacteria was inhibited by the presence or absence of unknown compounds. Neither the addition of essential trace nutrients, nor the prevention of the competition between the methanogens and the sulphate-reducing bacteria were able to reverse this inhibition. As tannery effluents contain very low concentrations of phosphorous, it is possible that the methanogens were inhibited by a lack of phosphorous, which is essential during methanogenesis. In contrast to the results obtained from the effluent experiments, the anaerobic digestion of tannery sludge was found to be possible. Of the organic solids present in the sludge, 60 % were degraded and converted into biogas, which had a methane content greater than 70 %. The degradation of the organic solids ensured that COD and PV reductions of greater than 90 % were achieved, and the fate of the compounds in the digesters were in agreement with the findings of the v synthetic study. Efforts to improve the efficiency of the digestion process through the addition of trace nutrients and the use of a two-stage process were only successful in bringing about a minor improvement in digester performance. The overall results of this investigation show, therefore, that although the anaerobic treatment of the tannery effluent was not achieved, the successful anaerobic digestion of tannery sludge is possible at low loading rates. As many difficulties still need to be solved, a great deal of further research is necessary if anaerobic digestion is to be used on an industrial scale for the treatment and disposal of tannery wastewaters.

Thesis (MPhil)--Stellenbosch University, 2008.
ENGLISH ABSTRACT: This study undertakes a scientific investigation into the social and environmental problems encountered by the Oshiwana Penduka informal settlement as a result of the lack of a proper sanitation system. This informal settlement is located on the periphery of the municipal boundaries of the town of Mariental in Southern Namibia, about 270 kilometres south of the capital, Windhoek. The unique problem faced by the settlement is the absence of sanitation facilities or sewage system as a method of solid waste management. Needless to say, the informal settlement is characterized by overcrowding, poor sanitation, lack of housing, unemployment and poverty. From the literature review, it became clear that inadequate water supply and sanitation posed serious implications to the physical environment and human health. The literature also reveals that these core challenges are propagated by the continual influx of people to urban areas and the re-birth of irregular settlements. In light of the above, the problem statements to be addressed are the following, namely: what is the impact of the absence of a proper and sustainable sanitation system on the inhabitants of the Oshiwana Penduka informal settlement and what can be done by the Mariental Municipality to address the concerns raised? The key research methods applied for this study entails individual semi-structured questionnaires and key informant groups. The answers to the interviewed questions are highlighted in chapter four and the interpretation of the research findings are constituted in the latter chapter. The hypothesis was proven false and the new model of thinking generated is suggesting that the prevailing social and environmental problems are caused by the absence of toilet facilities. It is evident to note from the study results that the negative social impact, which is being attributed by inadequate sanitation in the informal settlement, is severe and lethal to human health. In order to prove the hypothesis, data has been collected at household levels from the informal settlers. Despite the survey results which support the conventional water borne sanitation as the most preferred sanitation system, vacuum system as an ecological sanitation technology is recommended for this informal settlement. This particular sanitation system works on the principle of enhancing water conservation, recycling, reduction of health, and promotes environmental integrity.
AFRIKAANSE OPSOMMING: Hierdie studie onderneem ʼn wetenskaplike ondersoek na die sosiale en omgewingsprobleme, wat ondervind word deur die Oshiwana Penduka informele nedersetting en die gebrek aan ʼn behoorlike sanitasie stelsel. Hierdie betrokke informele nedersetting is geleë aan die buitewyke van die munisipale grense van die dorp Mariental. Die dorp Mariental is geleë in die suidelike deel van Namibië, ongeveer 270 km suid van die hoofstad Windhoek. Die unieke problem wat hierdie nedersetting ondervind is die afwesigheid van sanitasie fasiliteite of ʼn rioolstelsel wat ʼn soliede metode van goeie rioolbeheer is. Hierdie nedersetting word gekenmerk deur oorbevolking, swak sanitasie, gebrek aan behuising, werkloosheid en armoede. Vanuit die literatuurstudie, het dit aan die lig gekom dat onvoldoende water toevoer en sanitasie ernstige implikasies vir die fisiese omgewing en die menslike gesondheid inhou. Die literatuur het ook aan die lig gebring dat hierdie basiese probleme vererger word deur die aanhoudende invloei van mense na die stedelike gebiede. In die lig van bogenoemde, is die probleemstelling wat aangespreek moet word, soos volg: wat is die gevolge van ʼn gebrek aan ʼn behoorlike en volhoubare sanitasiestelsel vir die inwoners van die informele nedersetting en wat kan die Mariental Munisipaliteit doen om hierdie problem aan te spreek? Die navorsingsmetode wat aangewend word bevat individuele semi- gestruktureerde vraelyste en sleutel fokusgroepe. Die antwoorde op die onderhoudsvraelyste word vervat in hoofstuk vier en die vertolking van die navorsingsbevinding word in die daaropvolgende hoofstuk aangebied. Die hipoteses was verkeerd bewys en die alternatief wat gegenereer is, stel voor dat die bestaande sosiale en omgewingsprobleme veroorsaak word deur die afwesigheid van toilet fasiliteite. Ten spyte van die navorsingsresultate, wat ʼn watersanitasiestelsel as die meeste verkose stelsel ondersteun, word ʼn suigstelsel as ekologiese volhoubare tegnologie vir hierdie informele nedersetting aanbeveel. Hierdie betrokke sanitasiestelsel toon verskeie voordele, onder andere bewaring van water, vermindering van gesondheidsprobleme en die bevordering van omgewingsvolhoubaarheid.

The Green Drop Certification Programme, launched in 2008 alongside the Blue Drop Certification Programme, aims to provide the Department of Water Affairs with a national overview of how municipalities and their individual wastewater treatment works (WWTW) are complying with licence conditions set by the National Water Act (NWA) (No. 36 of 1998; DWAF 1998) and the Water Services Act (No. 108 of 1997; DWAF 1998). By publishing the results of each municipality’s performance, the programme aims to ensure continuous improvement in the wastewater treatment sector through public pressure. The programme has been identified by this project as a necessary linking tool between the NWA and the Water Services Act to ensure protection and sustainable use of South Africa’s natural water resources. It does this through assisting municipalities to improve their wastewater treatment operations which in theory will lead to discharged effluent that is compliant with discharge licence conditions. These discharge licences form part of the NWA’s enforcement tool of Source Directed Controls (SDC) which help a water resource meet the ecological goals set for it as part of Resource Directed Measures (RDM). The link between meeting the required SDC and achieving the RDM goals has never been empirically tested. This project aimed to determine the present ecological condition of the Uie River, a tributary of the Sundays River which the Sundays River Valley Municipality (SRVM) discharges its domestic effluent into. It then determined whether the SRVM’s WWTW was complying with the General Standard licence conditions and what the impact of the effluent on the river was through the analysis of monthly biomonitoring, water chemistry and habitat data. Lastly, the project examined the effectiveness of the Green Drop Certification Programme in bringing about change in the SRVM’s wastewater treatment sector, which previously achieved a Green Drop score of 5.6 percent. It wanted to examine the underlying assumption that a WWTW which improves its Green Drop score will be discharging a better quality effluent that will help a water resource meets the RDM goals set for it. The Kirkwood WWTW did not have a discharge licence at the time of assessment and was thus assessed under the General Standard licence conditions. It was found that the Kirkwood WWTW was not complying with the General Standard discharge licence conditions in the Uie River. This was having a negative impact on the river health, mainly through high concentrations of Total Inorganic Nitrogen (TIN-N), orthophosphate and turbidity. The SRVM should see an improvement in its Green Drop score for the Kirkwood WWTW. However, the municipality showed no implementation of necessary programmes. Implementation of these programmes would help the SRVM meet the General Standard licence conditions (part of SDC) which would help the Uie River meet the RDM goals set for it.

Thesis (MTech (Public Management))--Cape Peninsula University of Technology, 2017.
The communities of Khayelitsha face problems with regard to managing waste. Increase on the generation of solid waste in the households by the members of the community; far exceed the townships’ ability and capability for safe disposal. Littering in the township is also a persistent problem, despite various clean–up and anti-litter promotional campaigns and programs introduced by local government, private organizations and other community interest groups. The persistent problem of litter and mismanagement of solid waste in the household should be addressed. The rationale and assumption underpinning this study was that waste management problems are related to social norms and attitude of the people of Khayelitsha. To investigate this phenomenon, the study adopted a qualitative paradigm. 300 heads of household residing in Khayelitsha for more than 5 years were surveyed, and door to door interview questions were conducted in 2016 June. Data from the questionnaire were analysed using Thematic and coding analysis. NVivo software was used to generate frequency tables. The responses to most interview questions were consistent for all categories of respondents and did not vary according to respondents’ background, such as gender, location household size or education. The study showed that social norms and attitudes towards waste minimisation in Khayelitsha are related to the entire waste management operation, and householders in Khayelitsha think similarly. To improve waste management in Khayelitsha the following are recommended: • Government and business need to consider incentives to minimise waste; • Government needs to improve waste management service facilities and build recycling centre which are accessible to the community; and • Government and non-governmental organizations and community members should consider awareness, education and training programs on waste wise management.

Thesis (MTech (Public Management))--Cape Peninsula University of Technology, 2019.
The research provides a broad overview of the problem statement, research objectives, demarcation of the research, research methodology, and significance of the research, a brief literature review and the ethics statement. Theoretical background through a literature review of the selected topic, as well as of the legal frameworks that guide the provisioning of sanitation. The researcher consulted literature that describes the provisioning of sanitation by the City of Cape Town, and the challenges it faces in this regard. The researcher also discussed the legislation that guides sanitation, and five broad themes relating to sanitation, around which the research questions were formulated. The researcher discovered that City of Cape Town employees face a number of challenges that make their job difficult, especially in providing water and sanitation to the communities in Site C in Khayelitsha. The researcher concludes the study and makes recommendations regarding the provision of proper sanitation by the City of Cape Town. These recommendations are based on the study's questionnaire results

Solid waste management in high density low-income areas is a problem that manifests itself in ubiquitous illegal dumpsites and unhealthy living environmental conditions. Community participation in solid waste management in Duncan Village, C-Section has been found to be part of the solution to this problem. This study investigates community participation in SWM at household level, community waste project level and at informal salvaging/scavenging level. The integration of community participation into existing Buffalo City Municipality waste management plans and the nature of the relationship between the different interest groups are investigated. This study employs qualitative research methods where interviews and participatory observations are used to investigate key objectives. The nature of the relationships between councillors, C-Section residents and the Buffalo City Municipality Departments are tenuous and fraught with conflicts. These conflicts emerge due to the lack of communication as well as due to the non-integration of the community interest groups‟ views and activities into solid waste management in C-Section. The study suggests that this lack of communication should be addressed and that integrated participation of all stakeholders must be encouraged for effective solid waste management in a high density low-income community.

Šiame magistriniame darbe yra nagrinėjama Utenos savivaldybės vandentiekio ir nuotekų šalinimo sistemų būklė. Darbo tikslas - įvertinti Utenos miesto ir rajono vandentiekio, nuotekų tinklų ir nuotekų valyklų būklę, jų efektyvumą, nustatyti, kur ir kokios šių sistemų modernizavimo priemonės yra labiausiai reikalingos. Šiame darbe pateikiamos pagrindinės Utenos savivaldybės vandentiekio ir nuotekų surinkimo ir tvarkymo sistemų problemos bei galimi jų sprendimo variantai. Nustatyta, kad išsprendus Utenos miesto ir didžiųjų gyvenviečių nuotekų valymo problemas, 70% sumažės paviršinių vandens telkinių teršimas.
This article deals with Utena municipal water supply and sewage disposal systems state. The aim of the work is to evaluate water supply and sewage treatment plant’s state in Utena city and Utena district, to evaluate their effectiveness, to identify where and how wastewater disposal systems modernization measures are most needed. The article presents the main Utena municipal sewage collection and treatment systems problems and possible solutions. The main Utenos municipality and region sewage elimination system problems are presented and also some solution versions are given.

Orientador: Edson Aparecido Abdul Nour
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-19T04:53:17Z (GMT). No. of bitstreams: 1 Pereira_VanessaEgidio_M.pdf: 4329646 bytes, checksum: a31a8ea164fb943468ec91be8b81ab42 (MD5) Previous issue date: 2011
Resumo: Os sistemas de tratamento, para a potabilização da água ou para a redução da quantidade de poluentes presentes no esgoto antes de seu lançamento em corpos hídricos, englobam processos físicos, químicos e biológicos, sendo a geração de resíduos inerente tanto à concepção das estações de tratamento de água (ETA), quanto das estações de tratamento de esgotos (ETE). Os resíduos sólidos gerados em estações de tratamento de água têm características inorgânicas, sendo eles os resíduos retirados da água bruta por meio de processos químicos e físicos e também os produtos utilizados no condicionamento da água e na coagulação para remoção dessas impurezas. Como alguns estudos apontaram para disposições semelhantes para os dois tipos de resíduos, apesar das características diferentes de cada um, a proposta deste trabalho foi a de avaliar a possibilidade de tratamento combinado desses resíduos, aproveitando as diversas vantagens de cada material e verificando os impactos que podem ser gerados no tratamento do efluente. Utilizando essa premissa, foi avaliado o potencial de utilização de um lodo adensado proveniente de uma ETA como auxiliar em uma ETE que apresenta uma etapa utilizando processo físico-químico de tratamento. O estudo e levantamentos apresentados nesse trabalho tiveram por propósito apontar para uma solução técnica viável para a disposição do lodo gerado na estação de tratamento de água (ETA), adensado na estação de tratamento de lodo (ETL), transportado e lançado na estação de tratamento de esgotos (ETE), no município de Itatiba. Com base no trabalho desenvolvido, foi possível confirmar que o adensamento de lodo em sacos de geotecido possibilita que a água deles drenada possa ser lançada em córregos, pois atende aos padrões de lançamento exigidos pelas leis vigentes; o lodo, adensado na ETL e lançado na ETE, não prejudicou a eficiência do tratamento dos esgotos quanto à remoção de carga orgânica e sólidos suspensos totais, principalmente porque o processo adotado também utiliza coagulantes. Contudo, o limitante para o aumento do lançamento é determinado pelas condições em que foram consideradas para o projeto da ETE, principalmente quanto a carga de sólidos e volume afluente
Abstract: Treatment systems, even for water potabilization or to reduce the amount of pollutants in wastewater, include physical, chemical and biological processes, and waste generation are inherent to water or sewage treatment plants. Solid waste generated in water treatment plants have inorganic characteristic, being removed from raw water by chemical and physical processes and also products used in the conditioning of water and coagulation. The wastes generated in sewage treatment plants are derived from biochemical reactions and from decomposition of organic matter present in wastewater. As some studies have pointed to similar disposal solutions for both types of waste, despite their different characteristics, the purpose of this study was to evaluate the possibility of combined treatment of such waste, using the many advantages of each material and checking the impacts that they could generate in the sewage treatment. Using this premise, the potential use of a thickened sludge from a water treatment plant as to assist in a wastewater treatment plant was evaluated. The study and surveys presented here had the purpose to point a viable technical solution for the disposal of sludge generated in a water treatment plant narrow in the sludge treatment plant, transported and released at sewage treatment plant in Itatiba, São Paulo, Brazil. Based on the work developed, it was confirmed that the thickening of sludge in geotec bags allows water drained from them to be released into rivers, because it meets the discharge Brazilian standards required; the thickened sludge did not impair the efficiency of sewage treatment on organic load removal or suspended solids removal, mainly because the process adopted also uses coagulants. However, limiting the increase in the release is determined by project conditions, especially as the influent volume and solids load
Mestrado
Saneamento e Ambiente
Mestre em Engenharia Civil

The ecological position of micro-algae at the base of the aquatic food web makes them critical components of aquatic ecosystems. Their short generation time also makes them useful biological indicators because they respond quickly to changes in environmental condition, enabling timely identification and assessment of water quality changes. The inclusion of micro-algae as indicators in water resource regulation and management in South Africa has started recently, their more extensive use in biomonitoring and ecotoxicology programmes for water resource management would contribute to the South African policy if water resource protection. The standard algal growth inhibition assay with the species Pseudokirchneriella subcapitata is currently used for monitoring toxicity of in-stream and industrial wastewater discharges to freshwater micro-algae. The relevance of the data generated by standard toxicity bioassays has been questioned, since micro-algae in particular are extremely variable in their sensitivity to a range of contaminants and these standard species used may not occur in the local aquatic environment. As a result, international regulatory agencies, have recommended algal growth inhibition tests be changed from a single standard species to tests with a number of species. One recommendation, in addition to the use of standard toxicity tests, is the use of species isolated from the local environment which may be more relevant for assessing site specific impacts. This study investigated the value and application of locally isolated South African freshwater micro-algae in toxicity tests for water resource management and was carried out in three phases. The first phase involved isolating micro-algae from South African aquatic resources. Micro-algae suitable for toxicity testing were identified and selected using as set of criteria. Three (Scenedesmus bicaudatus, Chlorella sorokiniana and Chlorella vulgaris) out of eight successfully isolated species satisfied the prescribed selection criteria and these were selected as potential toxicity test species. The second phase focused on refining and adapting the existing algal toxicity test protocol (the algal growth inhibition assay) for use on the locally isolated algal species. The refinement of the test protocol was achieved by exposing the locally isolated species to reference toxicants in order to assess and compare their growth and sensitivity to the toxicants under the prescribed toxicity test conditions with that of the standard toxicity test species (Pseudokirchneriella subcapitata) and a commercial laboratory species (Chlorella protothecoides). During this phase, one of the three local species (Scenedesmus bicaudatus) was eliminated as a potential toxicity test species due to inconsistent growth. The third phase of the study involved assessing the sensitivity of the two remaining species (C. vulgaris and C. sorokiniana) to a range of toxicants (reference toxicants, salts, effluents and a herbicide) and comparing it to that of the standard toxicity test species P. subcapitata and C. protothecoides. The toxicants were selected based on their relative importance in the South African context, as well as the practicality of using these local micro-algae to routinely determine the impact of these toxicants on local aquatic resources. The growth of the four micro-algae was stimulated by the selected effluents. The standard toxicity test species P. subcapitata was ranked the most sensitive and of the four species to two reference toxicants and two inorganic salts. Chlorella sorokiniana was ranked the most sensitive of the three Chlorella species to two reference toxicants and two inorganic salts. The herbicide stimulated the growth of C. vulgaris while inhibiting the growth of the other species. Pseudokirchneriela subcapitata and C. sorokiniana showed high intra-specific variability in growth, which made it difficult to determine the effective concentrations of the herbicide and therefore compare the sensitivity of the species. This varied response of micro-algal species to toxicants may result in the biodiversity shifts in aquatic ecosystems, and also supports the recommendation of using a battery of different species to support more informed decisions in water resource management.

M.Sc.
The South African Water Act (Act 54 of 1956) was promulgated in 1956. Section 21 of this Act required the permitting of all effluent dischargers, including sewage works. The General and Special Standards were subsequently published in the Government Gazette in 1984 in accordance with this Act, which set effluent discharge quality limits for such discharges. This was the Uniform Effluent Standard approach. However, this approach did not take into account the assimilative capacity of the receiving water, or limitations thereof. This resulted in a decrease in the water quality in the nations' water resources (DEAT 1999). The White Paper on Water Policy in South Africa was published by the Department of Water Affairs and Forestry in 1997. This paper identified this concern and suggested a change in the way water quality was managed in the country. The National Water Act (Act 36 of 1998) was subsequently promulgated in 1998, and provided the tool to effect these changes. This Act adopted the Receiving Water Quality Objectives (RWQO) approach. This approach takes into account the impacts on the receiving water as well as the impacts on other water users. This mini-thesis compared SA legislation regulating the discharge of wastewater, and more specifically sewage effluent, into the environment, by comparing it to first world legislation performing the same function. The effectiveness of the implementation of the SA legislation was also investigated. This study concluded that the promulgation of the National Water Act of 1998 (Act 36 of 1998) brought SA legislation on par with first world trends. This is an advanced piece of legislation, the effects of which are only now beginning to be felt. Much of the changes required by this Act are still being initiated and may take years to fully implement. Most dischargers still have valid permits issued in terms of the Water Act of 1956 (Act 54 of 1956), and these permits must be replaced by licenses issued in terms of the National Water Act of 1998 (Act 36 of 1998). An important conclusion from this study is that the legislation is not prescriptive in terms of specifying discharge license conditions, but instead allows the relevant authority, the Department of Water Affairs and Forestry to adjust the stringency of such licenses to suite the degree of impacts resulting from such discharges. Discharge licenses are therefore very site-specific and tailored to suite the type of discharge and impacts on the receiving water and other water users. In this way the requirements of all water users, including the aquatic ecosystem of the receiving water body, are taken into account, and protected. One suggested improvement to the SA legislation however, is to regulate industrial dischargers to sewer using national legislation. This is currently regulated by the by-laws of the relevant local authority, but is often insufficient to protect the sewage works and ensure the proper functioning of these works, which is largely dependant on the quality of raw sewage intake. Further research is required to determine the impact of industrial dischargers to sewer, and investigate how to regulate such discharges using national legislation. This study additionally assessed the implementation of SA legislation and the effectiveness of control over sewage dischargers. Enforcement of this legislation is not necessarily uniform, since much of the responsibility to enforce discharge permits and licenses lie with various officials within the Department of Water Affairs and Forestry. One way to ensure uniformity would be to require regular auditing by higher levels and management within this Department. Another important aspect of enforcement of these permits and licenses is that all permit and license holders, including Local Authorities, should be treated in the same way.

Modern lifestyle has increased the amount of solid and liquid waste that humans create. There are issues associated with pollution and disposal. Adaptation of technologies from the developed world often does not provide the required solutions. This thesis describes an attempt at finding an ecologically and economically sustainable solution for waste management that is appropriate for poorer regions and remote areas. The proposed natural system is close to natural resources and uses biological waste processing methods that have proven to be saustainable. Available resources and low cost give an edge for such processes to be practical and realistic. The system is based on vermicomposting. Composting worms survive in the harsh environments found in most parts of the developing world. Areas for further research and process optimisation were identified that would pave the way for future endeavours towards development of a fully working model. The treatment system is shown to work and achieve the objectives of treating waste to usable products including worms for feed supplement, compost fertilizer and irrigation water.
Doctor of Philosophy (PhD)

The landfilling of Municipal Solid Waste poses a threat to the environment in the form of landfill emissions. These emissions are a result of the biochemical breakdown of the waste in the anaerobic landfill environment. A solution to this problem has been found in the form of the mechanical-biological treatment of waste. This technology involves mechanical and biological processing of the waste before it is placed in the landfill. The pretreatment accelerates the degradation of the waste resulting in the landfilling of a more biologically stable product, resulting in a reduction of the emission potential of the landfill. This research aims at investigating the applicability and efficiency of a passively ventilated MBT windrow system under a sub-tropical climate. The research was conducted in two stages: the first stage focused on the implementation and analysis of the Mechanical Biological Treatment (MBT) process with aerobic windrows, employing the Dome Aeration Technology (OAT) (Mollekopf et al. 2002). Three OAT windrows were constructed at the Bisasar Road Landfill in Durban in order to study the efficiency of the process after different composting timeframes (8 and 20 weeks). The study proved that the use of the OAT technology is a viable option. The second stage was the analysis of this treated waste in an anaerobic environment, in order to simulate landfill conditions and, thus gain insight into the effect of MBP on landfill emissions. Six Iysimeters and 5 columns as well as numerous eluate tests were conducted in order to study the "post-Iandfilled" behaviour of the waste and the effect that waste treatment, composting time and screening have on liquid and gaseous emissions. A basic cost estimate using the Clean Development Mechanism for financial assistance was conducted. The results of this research were then utilised to make recommendations on sustainable waste disposal options. The findings of the research were that although the MBT did not reduce emission levels sufficiently to allow for a 40 year landfill aftercare period, the benefit over the landfilling of untreated waste is significant.
Thesis (Ph.D.)-University of KwaZulu-Natal, Durban, 2009.

Thesis (MPA.) -- University of Limpopo, 2017
The World Health Organisation (WHO) and World Bank (WB) state that worldwide access to sanitation has improved with countries in the north having 100% access to sanitation. However, only 64% of the world's population has access to improved sanitation. Sub-Saharan Africa has a noticeable improvement with South Africa improving from 73% in 2010 to 74% in 2014. They further estimate that $260 billion is lost globally each year due to lack of adequate water supply and sanitation. Universal access to water and sanitation would result in an estimated $32 billion in economic benefits per year globally from reductions in health care costs and increased productivity from reduced illness. Sub-Saharan Africa loses an estimated 4.3% ($US694 billion) of its Gross Domestic Product (GDP) each year due to lack of adequate water supply and sanitation. Furthermore, the UNDP (2015) indicates that sanitation is one of the Millennium Development Goals (MDG), however many regions are performing poorly in attaining their declared sanitation targets. South African has not reached its target but it is maintaining its commitment to the provision of sanitation as a basic human right. However, it has left the responsibility to local government to work out how this should be done with no legislation. Currently there is no policy on sanitation and municipalities only develop by-laws that serve as guidelines in managing waste and providing the service. The available literature on this subject speaks very little about the knowledge and understanding that the communities have with regard to faecal sludge management and no study at all deals with the perceptions of people on this issue, particularly around Polokwane Municipality. It is for these reasons that the study was aimed at investigating the perceptions of Polokwane residents regarding alternative faecal sludge management. Methodologically the study used qualitative research approach where in face-to-face interviews and focus group interviews were conducted around Polokwane Municipality. Among the participants interviewed were Ward Councillors, Community Development Workers, Ward Committees and Traditional Authorities. These stakeholders were intentionally chosen as they are at the coalface of service delivery on a daily basis and they are part of the forums that interact with the Municipality on basic services and other related community matters. Data for this study were analysed using thematic data analysis approach. vi  The findings of this study suggest that the “concerned residents” under Polokwane Municipality see themselves being victims and vulnerable to controllable health threats. In addition, the study discovered that the majority of participants were aware of the delegated sewage maintenance duties on the Polokwane Municipality. This study findings further indicated that there is a growing concern among municipal authorities and communities‟ especially in Africa and South Africa in particular, to improve the inadequate faecal management. The objectives of the study were among others to determine the perceptions and awareness of the Polokwane Local Municipality residents regarding alternative faecal sludge management methods. Indeed, it has been discovered that some of the residents are aware of various management methods but expect authority to develop policies and improve the inadequate methods that are currently used in managing faecal sludge. The study among others discovered that this study should be used as a point of reference for municipal projects administration, i.e. for the development of Integrated Development Plan (IDP) on the water and sanitation and faecal sludge management in future. The Ministry of environmental health and management at Polokwane Local Municipality should organise solid and integrated awareness with the community to ensure a healthy environment for all. The study further realised that there is a need to equip most of residents in Polokwane Local Municipality with knowledge on how best man can improve environmental health, as well as how worse can a person destroy the environment. It should be an important task for the Polokwane Local Municipality to ensure that residents understand the faecal sludge management enterprise developments in the area to reduce the incompleteness of the perceptions among the residents. Various faecal sludge methods should be adopted and encouraged among the Polokwane Local Municipality residents in order to promote the preference for the sanitation methods. Key words: Sanitation, Faecal sludge, Faeces, Health hazards and Sub-Saharan Africa

Submitted in fulfillment of the requirements for the degree of Master of Engineering, Department of Chemical Engineering, Durban University of Technology, Durban, KwaZulu-Natal, South Africa, 2017. .
One of the major effects of socio-economic change due to industrialisation is the generation of industrial wastewater, which requires treatment before being released into the environment. Laboratory-scale aerobic sequencing batch reactors under suspended-growth heterotrophic activated sludge were operated in different aeration configurations to study their effect on the treatment of wastewater generated by a local brewery. The main purpose of this study was to evaluate the performance of the two laboratory-scale aerobic sequencing batch reactors treating brewery wastewater under continuous low-oxygen dosing concentration and cyclic aeration schemes on SBR operation. The characterisation of brewery wastewater was undertaken to assess the physicochemical composition of the wastewater produced from one of the breweries in South Africa (SAB). The data showed distinctive characteristics of brewery wastewater, which coincided with studies previously carried out on characterisation of brewery wastewater. The COD average concentration of the brewery influent was 7100 mg/L, with average pH values of 7. The BOD and the total solids content of the brewery wastewater influent from the facility were both high, implying that the influent was very rich in organic content and its discharge into water-receiving bodies or the municipal treatment plant could have adverse effects. From these results, a need for a competitive treatment technology was clearly highlighted so as to carry out a feasible treatment of the influent for the brewery industry. The aerobic sequencing batch reactors were designed, fabricated and set up for laboratory-scale treatment of wastewater from the brewery for 15 weeks. The performance of the two SBR configurations was determined with reference to COD, BOD, TS, VS and TSS. The experimental results demonstrated that wastewater generated from the breweries can be treated successfully using both aeration configurations. The results obtained indicated that treatment efficiencies in terms of COD and BOD were 94 % and 85 % respectively, for the reactor operated under continuous aeration configuration, while 81 % and 65 % was achieved for the reactor operated in the cyclic aeration scheme. The findings from this study demonstrate that the performance of the reactor operated under the continuous aeration scheme was successful, and showed statistically significant differences from the performance of the reactor operated under cyclic aeration schemes. These findings imply that there is a potential for the equipment, including financial benefit as a result of operating aerobic sequencing batch reactors for treating brewery wastewater under continuous low-oxygen concentration dosing schemes. In this study, it was also established that the maximum COD removal could be reached at an optimum hydraulic retention times of 5 days for both reactors. This was based upon viewing the experimental data; it appeared that the most significant difference in percentage COD removal was for HRTs 3 days and 4 days. Although, due to less percentage COD removal observed from HRTs 5 days till 7 days, it was hence established that the optimum removal of high strength organics in the brewery wastewater could be achieved within 5 days of treatment time. The pH adapted at an average of 7 for all batch experimentations of the study. The temperature maintained an average of 23 oC ambient, throughout the experimental period. These physical parameters ensured that the microbial population was kept healthy, without inhibiting its biological degradation activity. Although, sludge build up was observed in both aerobic SBRs on completion of each batch operation due to solids retention and organic pollutants biodegradation from the brewery wastewater. It was perceived that frequently reseeding both aerobic SBRs, as an alternative to 28 days sludge retention time would enhance the recovery of biomass, thus improving the overall removal of TSS consequently minimising sludge bulking in both reactors.
M

MENVSC
Department of Ecology and Resource Management
The main objective of the study was to investigate the effectiveness of municipal solid waste management system, its potential implication in Vhembe District Municipality, South Africa and to recommend strategies for effective management of municipal solid waste in the district. To achieve this, structured questionnaires, interviews, field observations and focus group discussions were used to collect primary data within the district. The study focused on the four local municipalities: Makhado, Thulamela, Musina and Collins Chabane. Desktop study was also undertaken to gather secondary data by reviewing journals, technical reports, books and articles. The study adopted a mixed method approach comprising of triangulation of qualitative and quantitative design. The target groups of the study were selected through purposive sampling. The respondents in the study were 21 officials from local municipalities including directors, waste managers, superintendents, landfill supervisor and interns. Data was collected using focus group interviews and questionnaires and analysed using descriptive statistics which involve the presentation of numerical facts, or data, in either tables or graphs form. Municipalities in the district are producing a considerable amount of solid waste. Municipalities do not adhere to the existing guidelines on waste minimization at source, for example; they do not have zero waste strategy (3R) reduce, reuse and recycle, which is the highest priority of the National Waste Management Policy. Lack of the application of existing waste management policy leads to large amount of solid waste eventually ending up in landfill sites. The study recommends to municipalities to develop operational and monitoring waste management plans which will create continuous improvement on waste management. In the district, it was observed that the bulk of waste generated per month within municipalities is general waste comprising 64%, as compared to garden waste and building rubbles. There are no equipment and programs in place by municipalities to encourage waste separation at source, for example, municipalities do not have household‟s recyclable receptacles to encourage separation at source. Municipalities do not have weighbridge to quantify waste entering the site. It was observed that Thulamela and Collins Chabane Local municipalities create compost from garden waste received at the landfill sites, whereas Musina and Makhado Local Municipalities do not create compost from garden waste. Garden waste is dumped and compacted with other waste materials in the landfills. All municipalities should create compost from garden waste received at the landfill sites as it helps to extend the life span of the landfills because it v reduces the amount of waste to the landfill. There is lack of prioritization within municipalities, for example, in Makhado Local Municipality, when the new financial start, budget is allocated to other proposed projects by councilors as they consider waste management projects not a priority. It was observed that within the district, there is high level of illegal dumping in catchment areas and open spaces especially at Musina Local Municipality. Musina Local Municipality is using a quarry as disposal site which was not lined and it has led to contamination of underground water by leachate, whereas Thulamela, Collins Chabane and Makhado Local Municipalities are using lined landfill sites to avoid contamination of underground water. The available vehicles within the municipalities are not enough to meet the demand and some of them are too old, for example, tractors and trucks used by Makhado Local Municipality are 20 years old and they often breakdown, whereas Thulamela, Collins Chabane and Musina Local Municipalities are not using old vehicles as they auctioned old vehicles and bought new ones. Vhembe District Municipality should manage waste in accordance to the new approach of source separation, waste reduction, reuse and recycling by developing environmental awareness programmes supported by the placement of the recyclable receptacles at strategic points to collect recyclable materials which will reduce large amount of waste which eventually ends up in landfills. The study recommends that municipalities should have law enforcement structure which will create and enforce the laws/policies as it helps municipalities to implement effective waste management system and monitoring structure to monitor prioritization and budget allocation to avoid any wastage. Municipalities should have landfill monitoring committees to facilitate the compliance on the development and operation of the landfills to avoid the use of quarry as landfill sites.
NRF

Die Abwasserbeseitigung der Großstädte in der Bundesrepublik Deutschland steht vor großen Herausforderungen durch demografische, wirtschaftliche und soziale wie auch durch klimatische Veränderungen bei sich wandelnden technischen, rechtlichen und planerischen Anforderungen. Vor diesem Hintergrund zeichnet sich ein Paradigmenwechsel beim Umgang mit Niederschlagswasser im urbanen Raum ab. Während Niederschlagswasser zumeist vollständig und so schnell wie möglich über ein zentrales Entwässerungssystem beseitigt wird, erlaubt die naturnahe Regenwasserbewirtschaftung einen natürlicheren Umgang mit Niederschlagswasser. Sie zielt darauf ab, Niederschlagswasser möglichst ortsnah zu speichern, zu behandeln bzw. zu reinigen und/oder gedrosselt abzuleiten. Für die planungsrelevanten Akteure der Stadt- und Infrastrukturentwicklung (Stakeholder) ergeben sich unterschiedliche Ansätze zur Dezentralisierung, die im Siedlungsbestand einen aufwändigen Transformationsprozess nach sich ziehen. Die vorliegende Forschungsarbeit beschäftigt sich mit den Einflussfaktoren auf die Entwässerungssysteme und damit, wie sich diese Einflüsse auf die Motivation der Stakeholder zum Ausbau der naturnahen Regenwasserbewirtschaftung im Mischwassersystem deutscher Großstädte auswirken. Ziel ist es, motivationsgetriebene Entscheidungs- und Verhaltensmuster zu identifizieren und Zusammenhänge mit den räumlichen Gegebenheiten, aber auch mit den Handlungsorientierungen der Stakeholder detailliert aufzuzeigen. Hierfür werden einerseits die großstädtischen Rahmenbedingungen untersucht und andererseits die Vertreter der fünf Fachbereiche Aufgabenträger der Abwasserbeseitigung, Amt für Stadt- und Landschaftsplanung, Amt für Umweltplanung, Amt für Wasserwirtschaft und Fachausschuss/gremium als Schlüsselakteure des gesamtstädtischen niederschlagswasserbezogenen Planungsprozesses befragt. Für die Erfassung und Strukturierung des Untersuchungsgegenstandes wird auf Grundlage des akteurzentrierten Institutionalismus ein Analyseschema hergeleitet, welches die Analyse und Bewertung der räumlichen Gegebenheiten und Handlungsorientierungen der Stakeholder unterstützt. Mithilfe des Analytischen-Hierarchie-Prozesses wird eine multikriterielle Bewertungs- und Entscheidungsmethode implementiert, anhand derer die Stakeholder den Beitrag der naturnahen Regenwasserbewirtschaftung bewerten. Durch eine bundesweite Befragung wird aufgezeigt, dass die Stakeholder drei vergleichbare Entscheidungs- und Verhaltensmuster aufweisen, die aber nicht eindeutig mit den abwasserwirtschaftlichen Herausforderungen der jeweiligen Großstadt oder mit den kommunalen Aufgaben der Stakeholder zusammenhängen. Daraufhin lässt sich kein auf die Entscheidungs- und Verhaltensmuster ausgerichtetes Maßnahmenprogramm oder Werkzeug für den künftigen Umgang mit Niederschlagswasser im Sinne einer nachhaltigen Stadt- und Infrastrukturentwicklung aufzeigen und anwenden. Als Herausforderung stellt sich insbesondere die transparente Typisierung der stakeholderbezogenen Entscheidungs- und Verhaltensmuster basierend auf einer geringen Datengüte dar, woraufhin auch die Merkmalsausprägungen der großstädtischen Einflussfaktoren auf einer höheren Ebene zu generalisieren sind. Angesichts einer angestrebten nachhaltigen städtischen und infrastrukturellen Entwicklung unter Berücksichtigung der zunehmenden und komplexer werdenden abwasserwirtschaftlichen Bedürfnisse wird schließlich eine verallgemeinerbare hierarchische Handlungsempfehlung abgeleitet, die Stakeholder in der Entscheidungsfindung zur naturnahen Regenwasserbewirtschaftung unterstützen kann.:Abbildungsverzeichnis Tabellenverzeichnis Datenblattverzeichnis Abkürzungsverzeichnis 1 Einleitung 1.1 Gegenwärtiger Umgang mit Niederschlagswasser im urbanen Raum 1.2 Ziel der Arbeit 1.3 Aufbau der Arbeit 2 Einflussfaktoren und deren Auswirkungen auf die urbane Abwasserbeseitigung 2.1 Abwasserwirtschaft im urbanen Raum 2.2 Demografischer, sozialer und wirtschaftlicher Wandel 2.3 Klimawandel 2.4 Paradigmenwechsel – der Wandel zur naturnahen 3 Methodisches Vorgehen zur Beschreibung der Entscheidungs- und Verhaltensmuster 3.1 Ansätze zur Erfassung, Ordnung und Analyse niederschlagswasserbezogener Planungen 3.2 Ansätze zur Erfassung, Ordnung und Analyse stakeholderbezogener Präferenzen 3.3 Ansätze zur Erhebung stakeholderbezogener Präferenzen 3.4 Ansätze zur Typenbildung von Entscheidungs- und Verhaltensmustern 4 Charakterisierung der deutschen Großstädte 4.1 Wahl qualifizier- und quantifizierbarer großstädtischer Merkmale und deren räumliche wie auch zeitliche Auflösung 4.2 Extraktion der Merkmale für die Untersuchung 4.3 Räumliche Muster der großstädtischen Merkmale 5 Ergebnisse 5.1 Qualität der onlinebasierten Befragung 5.2 Bildung von Motivations-Typen 5.3 Prüfung der Hypothesen 5.4 Prüfung der niederschlagswasserbezogenen Wahrnehmungen der Stakeholder 6 Diskussion und Schlussfolgerung 6.1 Herausforderungen bei der Behandlung von Niederschlagswasser deutscher Großstädte im Mischwassersystem 6.2 Methoden zur Erfassung, Ordnung und Analyse motivationsgetriebener Entscheidungs- und Verhaltensmuster der Stakeholder 6.3 Zusammenhänge zwischen den motivationsgetriebenen Entscheidungs- und Verhaltensmustern der Stakeholder und den sich wandelnden großstädtischen Rahmenbedingungen 6.4 Empfehlungen zum Einsatz der naturnahen Regenwasserbewirtschaftung im großstädtischen Siedlungsbestand 6.5 Ziele und Rahmenbedingungen einer flächendeckenden naturnahen Regenwasserbewirtschaftung im Siedlungsbestand und deren Konsequenzen für die Stakeholder 7 Ausblick 8 Thesenbasierte Zusammenfassung Anhang Danksagung Quellenverzeichnis Selbstständigkeitserklärung
In view of the changing needs regarding residential water management – informed by demographic, economic, social as well as climatic shifts, added to technical, legal and planning requirements – a paradigm shift in the usage of rainwater in urban areas is becoming apparent. Whereas rainwater is currently drained as quickly and thoroughly as possible via a centrally managed infrastructure, a near to nature rainwater management permits a more natural handling of rainwater. This approach aims at the most local storage, treatment or respectively purification and/or restricted discharge. For the responsible urban and infrastructure development planners this leads to varying approaches to decentralisation, involving extensive transformational processes in existing settlements. Therefore this research paper deals with the factors influencing the decision making behaviour of planning-relevant actors regarding the utilisation of semi-natural rainwater management in the mixed-water-system of major cities in Germany. The objective is to identify motivational and behavioural patterns and illustrate the correlations to regional conditions as well as the stakeholders’ activity orientation in detail. To this end the surrounding metropolitan conditions as well as the five departments for wastewater disposal, Office for Urban and Landscape Planning, Office for Environmental Planning, Office for Water Usage and expert committee/panel as key actors in the comprehensive urban planning process regarding rainwater, are to be examined. To enable determination and structuring of the subject relevant to the study, a framework for analysis is derived on the basis of actor-centric institutionalism, which supports the analysis and assessment of the local conditions and activity-orientation of the stakeholders. Using an analytic hierarchical method, a multi-criteria procedure for evaluation and decision-making is implemented, whereby the stakeholder's contribution to the near to nature rainwater usage can be established and determined. It is pointed out that the nationwide interviewed stakeholders demonstrate three comparable action and behaviour patterns, which are not explicitly linked to the urban water management of a metropolis or the communal responsibilities of the stakeholders. This does not allow for the demonstration of differentiated or future application of measures and tools, aimed at action and behavioural patterns, for future handling of rainwater in the sense of a sustainable urban and infrastructure development. A particular challenge is the transparent typification of the stakeholders' action and behavioural patterns owing to poor data quality, whereupon the characteristic values of the study-relevant influences are to be generalised on higher levels. In view of the target sustainable urban and infrastructural development, while taking into account the growing and increasingly complex residential water management needs, the conclusion is a generalisable five-stage recommended action plan for the relevant planning actors, which supports the decision-making process regarding the optimal utilisation of semi-natural rainwater management.:Abbildungsverzeichnis Tabellenverzeichnis Datenblattverzeichnis Abkürzungsverzeichnis 1 Einleitung 1.1 Gegenwärtiger Umgang mit Niederschlagswasser im urbanen Raum 1.2 Ziel der Arbeit 1.3 Aufbau der Arbeit 2 Einflussfaktoren und deren Auswirkungen auf die urbane Abwasserbeseitigung 2.1 Abwasserwirtschaft im urbanen Raum 2.2 Demografischer, sozialer und wirtschaftlicher Wandel 2.3 Klimawandel 2.4 Paradigmenwechsel – der Wandel zur naturnahen 3 Methodisches Vorgehen zur Beschreibung der Entscheidungs- und Verhaltensmuster 3.1 Ansätze zur Erfassung, Ordnung und Analyse niederschlagswasserbezogener Planungen 3.2 Ansätze zur Erfassung, Ordnung und Analyse stakeholderbezogener Präferenzen 3.3 Ansätze zur Erhebung stakeholderbezogener Präferenzen 3.4 Ansätze zur Typenbildung von Entscheidungs- und Verhaltensmustern 4 Charakterisierung der deutschen Großstädte 4.1 Wahl qualifizier- und quantifizierbarer großstädtischer Merkmale und deren räumliche wie auch zeitliche Auflösung 4.2 Extraktion der Merkmale für die Untersuchung 4.3 Räumliche Muster der großstädtischen Merkmale 5 Ergebnisse 5.1 Qualität der onlinebasierten Befragung 5.2 Bildung von Motivations-Typen 5.3 Prüfung der Hypothesen 5.4 Prüfung der niederschlagswasserbezogenen Wahrnehmungen der Stakeholder 6 Diskussion und Schlussfolgerung 6.1 Herausforderungen bei der Behandlung von Niederschlagswasser deutscher Großstädte im Mischwassersystem 6.2 Methoden zur Erfassung, Ordnung und Analyse motivationsgetriebener Entscheidungs- und Verhaltensmuster der Stakeholder 6.3 Zusammenhänge zwischen den motivationsgetriebenen Entscheidungs- und Verhaltensmustern der Stakeholder und den sich wandelnden großstädtischen Rahmenbedingungen 6.4 Empfehlungen zum Einsatz der naturnahen Regenwasserbewirtschaftung im großstädtischen Siedlungsbestand 6.5 Ziele und Rahmenbedingungen einer flächendeckenden naturnahen Regenwasserbewirtschaftung im Siedlungsbestand und deren Konsequenzen für die Stakeholder 7 Ausblick 8 Thesenbasierte Zusammenfassung Anhang Danksagung Quellenverzeichnis Selbstständigkeitserklärung

South Africa is water scarce country with maximum rainfall received in the summer season which lasts for only three months (November, December and January); hence the water resources have to be protected. The municipal wastewater effluents are considered one of the environmental threats that impact the water quality of the streams. This study was conducted to assess the environmental impact that the wastewater effluent has on the Klip River system, the performance of the plant and also to assess the spatial and temporal variations of water quality along the Klip River system.The study focused mainly on historical data over a five period (2009 – 2013) years secondary data which was analysed by Johannesburg Water Ltd (Pty) and primary data were also collected and analysed using the standard methods of laboratory analysis. The standard methods used include Ion selective electrode, gravimetric techniques, iodemetric titration, membrane filtration method; colorimetric method, automated flow injection method and inductively coupled plasma atomic emission spectrometry (ICP – AES). The aim of collecting the primary data during the dry and wet seasons was to verify the secondary data. The data set was further analysed using multivariate techniques such as principal component analysis (PCA), factor analysis (FA) and discriminant analysis (DA) to determine the spatial and temporal variation of water quality. The data set using ten water quality parameters (ammonia, sulphates, Chlorine, Chemical Oxygen Demand, conductivity, Escherichia coli, sodium, nitrates, pH and suspended solids) was grouped into four sampling points (influent, effluent, downstream and upstream points) and four seasons.Discriminant analysis of water quality showed that out of ten water quality parameters analysed, only sulphates was a less significant parameter to discriminate between the sampling points. For the temporal variations, eight water quality parameters (ammonium, Chlorine, Conductivity, sodium, nitrates, pH, sulphates and suspended solids are the most significant parameters to discriminate between the four seasons. PCA/FA results highlighted similarities in terms of water quality loading between summer and winter seasons and between the winter and autumn seasons. Summer and winter seasons had strong positive loading in COD, ammonium, suspended solids and E. coli whereas the autumn and spring seasons had strong positive loading in sodium, chlorine and pH. The study further highlighted that the Olifantsvlei Wastewater Treatment Works (WWTW) is effectively treating the wastewater up to the required standards before discharging them into the Klip River system. This study concludes that the Olifantsvlei WWTW does not contribute significant loads of pollutants into the Klip river system.
Environmental Sciences
M. Sc. (Environmental Science)