Дисертації з теми "Sedimentation water treatment"
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Jenkins, Andre' L. Kramer Timothy L. "Conditions contributing to poor coagulation and sedimentation performance in municipal water treatment." Auburn, Ala., 2006. http://hdl.handle.net/10415/1310.
Повний текст джерелаByman, Lina. "Treatment of wash water from road tunnels." Thesis, KTH, Mark- och vattenteknik (flyttat 20130630), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171816.
Повний текст джерелаMcLoughlin, Liam. "A comparative study of flocculative water treatment by dissolved air flotation and sedimentation." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284679.
Повний текст джерелаHellstedt, Cajsa. "Calibration of a dynamic model for the activated sludge process at Henriksdal wastewater treatment plant." Thesis, Uppsala University, Department of Earth Sciences, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-88900.
Повний текст джерелаFör att simulera aktivslamprocessen på ett reningsverk krävs en dynamisk modell som realistiskt beskriver processen. 1987 kom IWA, International Water Association med ASM1, Activated Sludge model no. 1 som fortfarande är den mest använda modellen för att beskriva denna process. I detta examensarbete har ASM1 används för att beskriva aktivslamprocessen på Henriksdals reningsverk i Stockholm. Arbetet har utförts som en del i ett europeiskt projekt, HIPCON (Holistic Integrated Process CONtrol) på IVL, Svenska Miljöinstitutet AB.
Arbetet har gått ut på att ta fram en modell som realistiskt beskriver aktivslamprocessen och eftersedimenteringen. För att göra detta har en referensmodell i MATLAB/Simulink använts som grund och byggts om för att likna processen vid Henriksdal. Denna modell i Simulink använder ASM1 för att beskriva aktivslamprocessen. Eftersedimenteringen modelleras med en massbalansmodell där sedimenteringshastigheten beskrivs av en dubbelexponentiell sedimenteringsfunktion. Både ASM1 och sedimenteringsfunktionen använder en mängd olika parametrar för att beskriva processerna och dessa måste kalibreras fram för den process som skall modelleras. Aktivslamprocessen är en biologisk process som beror på en mängd yttre och inre faktorer och är unik för varje reningsverk. Därför finns det inte något enkelt sätt att kalibrera en modell på och information för det enskilda reningsverket i fråga måste tas fram. I detta arbete har två mätkampanjer utförts på Henriksdal för att få mätserier till kalibrering och validering samt information om avloppsvattnets sammansättning. Litteraturstudier har också genomförts för att få information om vilka parametervärden som är av störst intresse för modellen samt i vilket område varje parameter kan förväntas finnas.
Arbetet har sedan gått ut på att efter riktlinjer för kalibrering funna i litteraturen ta fram en modell som så realistiskt som möjligt beskriver processen på Henriksdal. Först genomfördes en kalibrering med medelvärden för att hitta jämviktstillstånd och därmed en stabil modell på länge sikt. Utifrån den modellen utfördes sedan en dynamisk kalibrering för att få en modell som beskriver även kortsiktiga och snabba förändringar. Till sist utfördes en validering för att kontrollera om modellen fungerar även för en dataserie som ej använts vid kalibrering. Den framtagna modellen fungerade mycket bra för att modellera medelvärden på lång sikt. För snabba förändringar verkade modellen ligga fel i tiden och troligtvis var den reella uppehållstiden kortare än den teoretiska och bidrar till sämre modellanpassning.
To simulate the activated sludge process at a wastewater treatment plant a dynamic model that describes the process is needed. In 1987 IWA, International Water Association presented ASM1, Activated Sludge Model No.1 which still is the most widely used model for this process. In this thesis the ASM1 has been used to describe the activated sludge process. The work is a part of a European project, HIPCON (Holistic Integrated Process CONtrol) at IVL, Swedish Environmental Research Institute.
The main objective of the work was to calibrate a model that realistically describes the activated sludge process and secondary sedimentation at Henriksdal wastewater treatment plant in Stockholm. A benchmark model in MATLAB/Simulink was used as a base and rebuilt and extended to fit the process of Henriksdal. In the model ASM1 is used to describe the activated sludge process. The settler is modelled with a mass balance model where the settling velocity is described by a double exponential function. The parameters used in both models have to be calibrated to fit the wastewater treatment plant. To find information about Henriksdal two measuring campaigns were performed to provide data for calibration and validation and to gather information about the composition of the incoming wastewater. From this data a model was developed and calibrated for the process at Henriksdal. After calibration the obtained model worked very well for modelling average values but did not adjust quite as well to fast dynamic changes.
Löf, Ludwig. "Evaluation of Dissolved Air Flotation for Water Purification: With Focus on Floc Characteristics and PFAS." Thesis, KTH, Kemiteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298378.
Повний текст джерелаIn this project, attempts have been made to collect data that allows the municipal association Norrvatten in the decision-making process on the flotation/ sedimentation step of their water treatment process. In this sense, poly- and perfluorinated alkyl substances (PFAS) concentration and the characteristics of agglomerated particles (flocs) have been investigated and compared between the two modes that the process can be operated. For the floc characteristics, the creation and stability of the flocs were investigated, and the particle size, size distribution and zeta potential was identified as important properties and thereafter analysed using the instrument zetasizer. The concentration of eleven different PFAS compounds were analysed. The results of floc characteristics show that there is no major difference in creation and breakage of flocs in the two investigated modes, since the analysed samples had the same zeta potential, -6.45 mV. The results were deemed uncertain because of varying results, and improvement suggestions include using photoanalysis to confirm similar floc appearances and to produce more data so a statistical validity can be quantified. As for the PFAS concentration, the concentration of PFAS were slightly lower in the treatment step in which sedimentation was utilized (7.5 ng/l) compared to when flotation was utilized (9.2 ng/l). The flotation mode did, however, create foam with a high PFAS concentration (3800 ng/l) compared to the liquid samples (5.5-9.2 ng/l), so a potential PFAS removal source was identified. The results were based on one sample series, so improvements of validity can be achieved by gathering more data, analysing more samples, and analysing the same sample in two different instruments measuring PFAS concentrations.
Nyström, Fredrik. "Coagulation process characteristics and pollutant removal from urban runoff." Licentiate thesis, Luleå tekniska universitet, Arkitektur och vatten, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73091.
Повний текст джерелаFerreira, Luciana Pallone Hespanholo. "Remoção da biomassa algal e determinação da concentração de microcistina pelo Método ELISA em ensaios de coagulação, sedimentação, filtração e adsorção." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-09062016-094459/.
Повний текст джерелаThis report presents the results of the quantification of microcystins and algae biomass concentrations after treatment of water samples taken from the Barra Bonita reservoir, for production of potable water. Bench-scale tests were carried out with and without powdered activated carbon (PAC) and the treatment processes used were: coagulation with ferric chloride (FeCl3), sedimentation and filtration with paper filter. It was determined that pre-clarification followed by sedimentation required substantial dosages of ferric chloride (80 mg/L). The removal of microcystins using sedimentation followed by filtration was ineffective without PAC. The use of PAC is required to produce water that meets current potability standards for microcystins removal as specified in Decree 518/04 (concentration less than 1 μg/L). Analysis of microcystins using the Enzime-Linked Immunosorbent Assay Method (ELISA) has proven to be an effective and reliable procedure to detect and quantify this toxin, although relatively expensive.
Pavanelli, Gerson. "Eficiência de diferentes tipos de coagulantes na coagulação, floculação e sedimentação de água com cor ou turbidez elevada." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-21012003-084719/.
Повний текст джерелаThe purpose of this study was to use four different coagulants - aluminum sulphate, iron chloride, polyaluminum hidroxichloride and ferric sulphate; to build the coagulation diagrams; and to mark the regions of higher or lower efficiency in the removal of turbidity or color. To allow a cost appraisal in the use of the coagulants, the region where the values of remaining turbidity, which are approximately the same for different coagulants, was examined in the diagrams. This being taken into consideration, the relation between consumption and cost of the chemical products was established. The coagulants that presented certain peculiarities for the studied waters were: iron chloride, that showed better performance for low pH values; the ferric sulphate, that showed itself as more economical; and the polyaluminum hidroxichloride, that functions in a large interval of pH. In the conclusion of the study, it was observed that each type of water to be treated must be analyzed through coagulation diagrams, aiming at the optimization of pH parameters versus dosages and looking for the best coagulant with lower cost.
Шуліка, Євгеній Олександрович. "Оцінка ефективності флокулянтів в процесах очищення зворотної води". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/30710.
Повний текст джерелаMaster's Thesis: p. 59, Table 11, fig.11, 88 primary sources. Purpose: to evaluate the efficiency of the use of cationic and nonionic flocculants for high-turbidity sewage treatment. Object of study: intensification of wastewater treatment processes. Subject of research: backwater illumination of mining and processing industries with the help of flocculants The results of studies of flocculation purification of aqueous suspensions with initial turbidity at 5-7 g / dm3 are presented in the paper. The basic physicochemical characteristics of the source water that influence the technological properties of flocculants are investigated: nature and hydraulic size of the suspended substances, their concentration, electrokinetic potential, advanced analysis of water according to various parameters is performed.
Carvalho, Eraldo Henriques de. "Disposição de resíduos gerados nas estações de tratamento de água em estações de tratamento de esgoto com decantação primária." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-13072018-091220/.
Повний текст джерелаIn the present work simulations studies were conducted to verify the impact of Water Treatment Plants (WTP) residuals on the performance of Wastewater Treatment Plants (WWTP). The WTP under investigation used ferric chloride as primary coagulant, was type Complete Cicle with sedimentation tanks with daily bottom discharge. The interferences in the primary sedimentation tanks were simulated using sedimentation tests, while the sludge digesters were simulated using anaerobic treatability tests. Complementary tests and analysis also were realized to verify eventual interferences in the wastewater biological treatment and in the physical treatment of the sludge. The results indicated an increment in the sedimentation eficiency caused by increasing the WTP residuals dose added into the wastewater. As WTP residuals was added at up to 225 mg dry weight solids per liter of wasterwater, the removal of solids, COD, phosphate and nitrogen, for example, increased in 50%. However, the primary tanks settled sludge volume increased considerably. According to the anaerobic treatability tests results, the WWP residuals had not toxical effects on the process, interfering positively on the methane production. Concerning the wastewater biological treatment and sludge physical treatment, no significant impacts on their performance were observed. Therefore, it can be concluded that conventional WWTP can receive similar WTP residuals as those of the WTP here studied without any negative impacts on their performance.
Pešout, Jakub. "Provozně technický stav objektů separace na úpravnách vody." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227682.
Повний текст джерелаBaranová, Zuzana. "Poruchové stavy úpraven vody." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226155.
Повний текст джерелаSolastiouk, Pierre. "Application de l'extraction liquide-liquide au traitement et a la revalorisation d'effluents industriels." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13140.
Повний текст джерелаChiang, Chia-ling, and 姜佳伶. "Turbidity Removal and Residuals Generation from Sedimentation and Filtration Processes in Water Treatment Plant." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/xs8hzm.
Повний текст джерела國立中央大學
環境工程研究所
96
This study was to investigate turbidity removal and residuals generation in sedimentation and filtration processes of Ping-Jan Water Treatment Plant. Furthermore, physical-chemical characteristics of residuals were also analyzed. According to the statistical data, the probability of raw water turbidity lower than 15 NTU in Ping-Jan Water Treatment Plant was 63%. However, raw water turbidity might higher than 10,000 NTU due to typhoon events. By changing the location of collecting raw water, the probability of turbidity over 10,000 NTU reduced from 4 to 1%. When influent turbidity was between the range of 15 to 500 NTU, the removal efficiency of turbidity and probability of settled water turbidity in sludge blanket clarifiers below 5 NTU were upon 90%. Moreover, the probability of settled water turbidity in tube settlers below 5 NTU was under 60% resulting from improper design of overflow weir when influent turbidity over 15 NTU. In addition, 7 NTU was the limit for the influent turbidity of Hardinge and Wheeler filters. Consequently, 3 and 6 NTU were suggested for these limits, respectively. For coagulation sludge from sludge blanket clarifiers, the SS was 3,955 mg/L, BOD5 was 5 mg/L, and COD was 172 mg/L. In addition, the characteristics of coagulation sludge of tube settlers including 6,262 mg/L SS, 35 mg/L BOD5, and 362 mg/L COD were increased with settled time. The routine amount of coagulation sludge from sludge blanket clarifiers and tube settlers were 1,975 and 2,014 kg/day, respectively. However, sludge production was 73 times of routine amount during typhoon seasons. The analysis results of the filter backwash water (FBW) produced by Hardinge and Wheeler filters revealed that the SS was 252 and 223 mg/L, BOD5 was <1 mg/L, and COD were 17 and 11 mg/L, respectively. FBW was typically only a small fraction of filtered water volume for Harding and Wheeler filters (0.2~0.3% and 1.9~2.5%, respectively). Additionally, the amount of FBW from Wheeler filters was 7~14 times comparing to that from Hardinge filters. When raw water turbidity was below 5 NTU, direct filtration might decrease PAC dosage in coagulation process and reduce the amount of coagulation sludge. Also, changing the strategy of two-stage coagulation sedimentation and adding flocculent while raw water turbidity was over 10,000 NTU might be reasonable. In addition, monitoring turbidity of FBW from Wheeler filters ensure media wasn’t too clean due to too long backwashing. Therefore, it might keep removal efficiency and reduce the amount of FBW of Wheeler filters.
Chiu, Yu-Ting, and 邱郁婷. "The Study of Dead End Micro-Filtration with Coagulation/Sedimentation Pretreatment in the Treatment of Backwash Water from Filter Bed." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/76169609805256886329.
Повний текст джерела嘉南藥理科技大學
環境工程與科學系暨研究所
95
In Taiwan, the filter backwash water needs to be recycled back to rapid-mixing tank in most of water treatment plants. However, this process caused several critical problems, including unstable chemicals control and accumulation of microorganism, which seriously affect the treated water quality. In this research, the supernatant of the waste backwash water treated by Dead-end type microfiltration (MF) process combined with coagulation and sedimentation was evaluated. The raw backwash water samples in this research were collected from Tanding Water Treatment Plant, Pingding Water Treatment Plant and Chang-Hwa Third Water Treatment Plant. First of all, water qualities for each treatment plants. First, the raw water qualities were analyzed. And then, several treatment processes were considered and executed, such as coagulation/sedimentation combined with MF Process and direct MF Process. PACl, alum and Chitosan were used as coagulation agents in the coagulation/sedimentation process. In the membrane process, there were two different MF membranes used in this research, including 0.5 µm and 2.0 µm pore sizes, which were filtered by vacuum pump at fixing pressure (0.65 kg/m2). The results indicated that the backwash wastewater from surface water source treated directly by sedimentation only combined with MF process was confirmed to demonstrate the serious scaling problems. However, the water treated by coagulation/sedimentation combined with MF Process (0.5 µm and 2.0 µm pore sizes) reached high efficiency of clean water. Coagulation/sedimentation combined with MF Process specifically for (0.5 µm pore size) executed the optimal result that reached the standards of turbidity, coliforms and total bacterial counts. As the result, this process was considered to be the best one for backwash water reclamation using MF process. This research also executed that the backwash wastewater from groundwater source treated by MF process (0.5 µm and 2.0 µm pore sizes). The result indicated that the 0.5 µm pore size exhibited higher treatment efficiency than 2.0 µm pore size. Moreover, the water quality treated by 0.5 µm pore size reached drinking water standards in turbidity, coliforms and total bacterial counts, no mater combined with filtration only or with coagulation /sedimentation. Therefore, direct filtration combined with MF process (0.5 µm pore size) was consider to be the optimal backwash water reclamation for Chang-Hwa Third Water Treatment Plant.
Pařík, Radim. "Optimalizace úpravy vody s dvoustupňovou separací suspenze." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-323413.
Повний текст джерелаEwerts, Hendrik. "Laboratory-scale evaluation of different aspects related to Ceratium hirundinella removal during simulation of a conventional water treatment plant which includes sedimentation / Hendrik Ewerts." Thesis, 2015. http://hdl.handle.net/10394/15926.
Повний текст джерелаPhD (Environmental Sciences), North-West University, Potchefstroom Campus, 2015
El, Henawy Walid. "The Effect of Selected Coagulants on Chloride-to-Sulfate Mass Ratio for Lead Control and on Organics Removal in Two Source Waters." Thesis, 2009. http://hdl.handle.net/10012/4229.
Повний текст джерела