Journal articles on the topic 'Organic wastewater pollution'
To see the other types of publications on this topic, follow the link: Organic wastewater pollution.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Organic wastewater pollution.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Zheng, Lina, Qi Liu, Jiajing Liu, Jingni Xiao, and Guangjing Xu. "Pollution Control of Industrial Mariculture Wastewater: A Mini-Review." Water 14, no. 9 (April 26, 2022): 1390. http://dx.doi.org/10.3390/w14091390.
Full textAbstract:
With the rapid development of intensive mariculture, lots of mariculture wastewaters containing residual feed and excrements are discharged into marinelands, leading to coastal pollution. Recently, the environmental problems caused by the discharge of mariculture wastewater have been paid much attention, as have other breeding industries in China. In fact, organic solid waste accounts for most of the pollutants and can be reduced by precipitation or filtration technologies, after which the supernatant can be easily treated by ecological methods. Some national guidelines and relevant local standards have been issued to strictly control the mariculture wastewater, but there are still few effective technologies for mariculture wastewater treatment due to its high salinity and extremely low pollutant concentration. This paper aims to propose feasible pollution control methods of mariculture wastewater according to the wastewater characteristics from different mariculture modes. For raw ammonia-based wastewater, it should be sequentially treated by precipitation, nitrification and denitrification and ecological methods, which would target solid waste, organic carbon/nitrogen and phosphorus removal, respectively. For the nitrate-based wastewater, this just needs denitrification filters and ecological methods for nitrate and phosphorus removal. After an overview of pollution control strategies for different types and scales of industrial mariculture wastewater treatment, some challenges are also mentioned.
2
Mitru, Daniel, Gheorghe Nechifor, Stefania Gheorghe, Iuliana Paun, Lucian Ionescu, Mihai Nita-Lazar, and Irina Eugenia Lucaciu. "The Romanian Map of Organic Pollution from Domestic Wastewaters � Seasonal Variations of Anionic Surfactants And Organic Load (COD)." Revista de Chimie 71, no. 4 (May 5, 2020): 317–24. http://dx.doi.org/10.37358/rc.20.4.8071.
Full textAbstract:
Surfactants represent the major class of chemicals used in the composition of detergents where the predominant groups are anionic surfactants. Because of the large utilization of detergents in different activities (agricultural, industrial, domestic) an important amount of surfactants can accumulate in the domestic and industrial wastewaters, that are discarded to wastewater-treatment plants (WWTP). Furthermore, surfactants could affect the process of biological wastewater treatment due the inhibition of activated sludge and subsequently the water bodies quality through discharge of WWTPs` effluents. In addition, the soil quality decreased through various modes of sludge applied. The concentrations of organic matters discharged in the wastewater systems from Romania have raised the attention of environmental authorities regarding the toxic impact of their components such as anionic surfactants on the environment. The present paper proposed to highlight the background of organic pollution from Romania through the monitoring of the organics amount in water by Chemical Oxygen Demand (COD) and by the specific indicator � Anionic Surfactants (AS). Temporal (winter, spring and summer, 2019) and spatial (six areas: West, North-West, North-East, East, South and South-West) monitoring of organic matter was performed. It has been found that the spatial and temporal variation of AS concentrations were well correlated with COD load, leading to the conclusion that surfactants represented an important part of the global organic matter.
3
Stoian, Oana, Cristina Ileana Covaliu, Gigel Paraschiv, Mihai Nita-Lazar, and Ioana-Corina Moga. "Photodegradable organic pollutants from wastewater." E3S Web of Conferences 286 (2021): 03017. http://dx.doi.org/10.1051/e3sconf/202128603017.
Full textAbstract:
Nowadays, environmental pollution is constantly increasing, and depollution is the most important challenge of the 21st century. This paper is a review of organic pollutants in wastewater that can be removed by the photocatalysis process. Also are presented specialized studies that demonstrate the removal of organic pollutants from wastewater and the experimental conditions necessary to obtain high treatment efficiencies. The important classes of pollutants in wastewater are hydrocarbons, halo compounds, carbonyl derivatives, alcohols, phenols, pesticides, surfactants, nitrogen containing compounds and dyes, and represent a major source of water pollution. These organic pollutants are photodegradable and can be easily removed by the photocatalysis process.
4
Xu, Jie. "Metal-Organic Frameworks for Photocatalytic Degradation of Organic Wastewater." Highlights in Science, Engineering and Technology 6 (July 27, 2022): 1–8. http://dx.doi.org/10.54097/hset.v6i.927.
Full textAbstract:
Environmental problems, including garbage disposal, land desertification, water pollution, and sand disaster, especially water pollution, should be faced seriously by human beings. Photocatalysis technology has been increasingly playing a dominant role in treating organic wastewater. This paper will introduce the degradation of organic wastewater using metal-organic framework (MOF) materials photocatalytic technology. This paper will summarize the related articles and research results published by the previous generation. This paper will introduce the material characteristics of MOFs and the physical and chemical properties of the materials and then will present the advantages of MOF materials in the photocatalytic degradation of organic wastewater. The working principle of MOFs for photocatalytic degradation of organic wastewater and the method of making MOF materials will be introduced. At the end of the article, the results of previous research in this field in recent years will be presented.
5
Yuting, Fu, Li Changbo, Zhao Guozheng, Liang Hui, Wang Shuo, and Xu Hongzhu. "Study on Pollution Characteristics of Shale Refinery Wastewater." E3S Web of Conferences 233 (2021): 01146. http://dx.doi.org/10.1051/e3sconf/202123301146.
Full textAbstract:
This paper studied the pollution characteristics of shale oil refinery wastewater, by using conventional analysis, infrared spectroscopy, ultraviolet spectroscopy, chromatography and mass spectrometry. The results showed that: wastewater contains high concentration of dissolved organic matter, which was poor in biological treatment. The organic structure of wastewater contains groups such as benzene ring, carbonyl group, hydroxyl group, ether group and carboxyl group. The composition of wastewater was very complex, which has phenols and oil compounds, with inorganic pollutants such as iron, calcium, magnesium, and sodium.
6
Zagorc-Koncan, J., and M. Dular. "Evaluation of biodegradation kinetics of organic wastewater in a laboratory river model." Water Science and Technology 30, no. 10 (November 1, 1994): 229–35. http://dx.doi.org/10.2166/wst.1994.0532.
Full textAbstract:
A laboratory river model for the study of biodegradation kinetics of organic pollution in surface waters is presented. It enables an engineering - technological prediction of the impact of wastewater biodegradation on DO and TOC profile in a river downstream from the point of entry of wastewater effluent thus providing rapidly and inexpensively significant design information to an environmental scientist or engineer. The method was applied to the determination of degradation of pharmaceutical wastewaters. Biodegradation during adaptation and a comparative study on organic constituents, biodegradation rates in polluted and unpolluted river waters were simulated.
7
Pinchai, C., M. Monnot, S. Lefèvre, O. Boutin, and P. Moulin. "Membrane filtration coupled with wet air oxidation for intensified treatment of biorefractory effluents." Water Science and Technology 80, no. 12 (December 15, 2019): 2338–43. http://dx.doi.org/10.2166/wst.2020.052.
Full textAbstract:
Abstract This work aims to analyse the performances of a new hybrid process: membrane filtration to concentrate biorefractory wastewater before treatment by a hydrothermal process such as wet air oxidation. The aim is to obtain a complete discharge of the effluent in the environment. The three different synthetic wastewaters under study were pharmaceutical wastewater, grey wastewater and bilge wastewater. The results of the membrane filtration showed high retention rates as it could reach between 75% and 100% of total organic carbon retention, more than 99% of turbidity removal and more than 70% of hydrocarbon retention. Moreover, it was possible to achieve high concentration factors comprised between 17 and 40 times. Membrane fouling was chemically reversible regardless of the type of pollution. Then, the treatment of the membrane retentates by wet air oxidation process (300 °C, 15 MPa) could eliminate more than 83% of organic pollution for all the tested effluents. In summary, the hybrid intensified process could finally decrease the volume and the waste load of wastewater before possibly discharging it into the environment.
8
Eremektar, G., O. Tünay, D. Orhon, and E. Gönenç. "The pollution profile of alcohol distilleries treating beet sugar molasses." Water Science and Technology 32, no. 12 (December 1, 1995): 181–88. http://dx.doi.org/10.2166/wst.1995.0485.
Full textAbstract:
Fermentation of molasses and refining the produced alcohol by distillation is a common agroindustrial activity. The wastewaters originating from the process, especially the spent mash, are highly concentrated and contain TDS of over 50,000 mg/l as well as organic matter. Character of wastewaters varies with production application which affects the treatability characteristics. In this study four alcohol distillery plants treating beet sugar molasses are investigated to assess production applications and wastewater characteristics. Process profiles for three major modes of operation are prepared. Use of open steam and recycle of spent mash was calculated to affect the wastewater volume up to 25%. COD load is found to be practically unchanged with recycle while TDS increased significantly. Nature of COD and treatability characteristics are also expected to vary with recycle.
9
Li, Lili, Yaobo Shi, Yun Huang, Anlu Xing, and Hao Xue. "The Effect of Governance on Industrial Wastewater Pollution in China." International Journal of Environmental Research and Public Health 19, no. 15 (July 29, 2022): 9316. http://dx.doi.org/10.3390/ijerph19159316.
Full textAbstract:
Water pollution not only aggravates the deterioration of the ecological environment and endanger human health, but also has a significantly negative impact on economic growth and social development. It is crucial to investigate the relationship between industrial wastewater governance and industrial wastewater pollution on the path to reduce water pollution. In this paper, we studied whether industrial wastewater governance affected industrial wastewater pollution using the panel fixed effect model and system generalized moment estimation model (SYS-GMM) with the panel data of 30 provinces from 2005 to 2020 in China. This is the only empirical analysis of the relationship between industrial wastewater governance and industrial wastewater pollution. We proxied industrial wastewater pollution by organic pollutants and inorganic pollutants and measured the per capita investment in industrial wastewater governance. The results shed light on the positive correlation between the per capita investment in industrial wastewater governance and industrial wastewater pollution. The increase in per capita investment in industrial wastewater governance promoted the increase of pollutant emissions from industrial wastewater. The estimation also indicated that there was an inverted U-shaped relationship between per capita GDP and inorganic /organic pollutants in industrial wastewater. Our empirical research shows that it is necessary to increase investment in industrial wastewater treatment and optimize the investment structure of environmental treatment, so as to pave the way for the comprehensive utilization of a variety of environmental treatment solutions.
10
Karpińska, Joanna, and Urszula Kotowska. "Removal of Organic Pollution in the Water Environment." Water 11, no. 10 (September 28, 2019): 2017. http://dx.doi.org/10.3390/w11102017.
Full textAbstract:
The development of civilization entails a growing demand for consumer goods. A side effect of the production and use of these materials is the production of solid waste and wastewater. Municipal and industrial wastewater usually contain a large amount of various organic compounds and are the main source of pollution of the aquatic environment with these substances. Therefore, the search for effective methods of wastewater and other polluted water treatment is an important element of caring for the natural environment. This Special Issue contains nine peer-review articles presenting research on the determination and removal of environmentally hazardous organic compounds from aqueous samples. The presented articles were categorized into three major fields: new approaches to the degradation of water pollutants, new methods of isolation and determination of the emerging organic contaminants (EOCs), and the occurrence of EOCs in the water environment. These articles present only selected issues from a very wide area, which is the removal of organic pollution in water environment, but can serve as important references for future studies.
11
Tang, Junyu, Qizhao Liang, Changling Li, Xianghu Huang, Xiaoqing Xian, Jinhe Li, Zhuangzhuang Shang, Chunjin Pang, Yu Liu, and Rui Zhang. "Application of Marine Algae in Water Pollution Control." IOP Conference Series: Earth and Environmental Science 966, no. 1 (January 1, 2022): 012001. http://dx.doi.org/10.1088/1755-1315/966/1/012001.
Full textAbstract:
Abstract Water pollution is mainly caused by chemical pollution, especially inorganic and organic pollutants, including toxic metals and metalloids as well as various synthetic or organic chemicals. Marine algae have good adsorption capacity for heavy metals such as As, Zn, Cu, Cd, Pb et.al in polluted water, and can also have certain removal ability for pollutants such as nitrogen and phosphorus in sewage. This paper reviews the current application status of wastewater treatment and the mechanism and application of marine algae in wastewater treatment, aiming at providing reference for further research and development of marine algae in wastewater treatment.
12
Ma, Jian Feng, Jian Ming Yu, Bing Ying Cui, Ding Long Li, and Juan Dai. "Treatment of Dye Wastewater by Zero Valent Iron Composited Organobentonite." Advanced Materials Research 340 (September 2011): 229–35. http://dx.doi.org/10.4028/www.scientific.net/amr.340.229.
Full textAbstract:
A novel material, zero valent iron composited organobentonite (NZVI-OB), was synthesized to adsorb dye from wastewater and to degrade the dye for avoiding secondary pollution. The crystal structure was characterized with X-ray diffraction (XRD). The effect of initial Orange II concentration and reaction time on the removal of Orange II by the NZVI-OB was studied. And the removal mechanism of Orange II was discussed. The results show that the Orange II can be removed by NZVI-OB efficiently. The maximal adsorption amount is 112.66 mg/g. The iron can effectively degrade the organic compounds after adsorption pollution, the carbon contents of organic pollutions after catalyzed and oxidized by the iron are lowered to the 19% of the original.
13
Luo, Qiao, Jing Wang, JianHui Wang, Yu Shen, Peng Yan, YouPeng Chen, and ChengCheng Zhang. "Fate and Occurrence of Pharmaceutically Active Organic Compounds during Typical Pharmaceutical Wastewater Treatment." Journal of Chemistry 2019 (April 8, 2019): 1–12. http://dx.doi.org/10.1155/2019/2674852.
Full textAbstract:
The chemical composition, distribution, and fate of pharmaceutically active compounds (PhACs) present in typical pharmaceutical wastewater treatment plants were investigated with the aim of effectively removing these pollutants while minimizing waste of resources and energy. The results of this study indicate that the relative content of an organic compound class is unrelated to the number of organic compounds in the influent and effluent, yet it is directly proportional to the pollution contribution in pharmaceutical wastewater. In wastewater influent, the organic compound classes with the highest relative contents and pollution contributions were acids (relative content = 63.65%, contribution to pollution = 67.22%), esters (44.96%, 41.24%), and heterocyclic compounds (30.24%, 35.23%); in wastewater effluent, these classes were organic acids (62.54%, 65.13%), esters (52.66%, 59.02%), and organosilicon compounds (42.46%, 37.45%). The different physicochemical characteristics of these pollutants result in different removal efficiencies. For example, N,N-dimethylformamide, 4-methyloctane, N-ethylmorpholine, and 4-amino-N,N- and N,N-diethylbenzamide are refractory and are not degraded by microorganisms; thus, these compounds are discharged into the aquatic environment. Other organic compound classes including organosilicon compounds, acids, esters, heterocycles, and alcohols are mostly biodegraded, which leads to high concentrations of hydrocarbons in the wastewater effluent. The results of this study provide a foundation for the improvement of pharmaceutical wastewater treatment.
14
Pérez Orosa, Laura, Eva Chinarro, Domingo Guinea, and María C. García-Alegre. "Hydrogen Production by Wastewater Alkaline Electro-Oxidation." Energies 15, no. 16 (August 13, 2022): 5888. http://dx.doi.org/10.3390/en15165888.
Full textAbstract:
The current work presents the electro-oxidation of olive mill and biodiesel wastewaters in an alkaline medium with the aim of hydrogen production and simultaneous reduction in the organic pollution content. The process is performed, at laboratory scale, in an own-design single cavity electrolyzer with graphite electrodes and no membrane. The system and the procedures to generate hydrogen under ambient conditions are described. The gas flow generated is analyzed through gas chromatography. The wastewater balance in the liquid electrolyte shows a reduction in the chemical oxygen demand (COD) pointing to a decrease in the organic content. The experimental results confirm the production of hydrogen with different purity levels and the simultaneous reduction in organic contaminants. This wastewater treatment appears as a feasible process to obtain hydrogen at ambient conditions powered with renewable energy sources, resulting in a more competitive hydrogen cost.
15
Maddah, Hisham A. "Predicting Optimum Dilution Factors for BOD Sampling and Desired Dissolved Oxygen for Controlling Organic Contamination in Various Wastewaters." International Journal of Chemical Engineering 2022 (February 21, 2022): 1–14. http://dx.doi.org/10.1155/2022/8637064.
Full textAbstract:
High biochemical oxygen demand (BOD) concentrations in water minimize oxygen availability, damage ecosystem biodiversity, impair water quality, and spoil freshwater. The increased level of BOD is an indication of severe organic pollution of freshwater. Thus, this study aims to establish empirical correlations between the 5-day biochemical oxygen demand (BOD5) and organic decomposition time to control organic pollution in various wastewater effluents. Ultimate biochemical oxygen demand (UBOD) and minimum and average BODt data sets along with their reaction rates were collected from earlier sampling analyses in the plants used for industrial, domestic (sanitary), and storm (surface) wastewater treatment. Average BOD5/COD ratios were then utilized to calculate existing 5-day dissolved oxygen (DO5) concentration for the estimation of experimental dilution factors (dfs) as a good start in sampling analysis to reach an optimum DO5 concentration. Moreover, the relationships between average BOD5 vs. COD, and BOD5 vs. DO5, were obtained based on the literature with 60–70% oxygen consumption rates required for organic decomposition. Results showed that such BOD5 relationships with time (power equations) or with COD (linear correlations) are helpful for wastewater engineers to generate valuable and accurate results for quality control, without the need to conduct laboratory experiments. The proposed regression equations would facilitate effluent quality assessment, allowing selection of optimal processes to control microbiological contamination or organic constituents in wastewaters.
16
Lettinga, G., J. A. Field, R. Sierra-Alvarez, J. B. van Lier, and J. Rintala. "Future Perspectives for the Anaerobic Treatment of Forest Industry Wastewaters." Water Science and Technology 24, no. 3-4 (August 1, 1991): 91–102. http://dx.doi.org/10.2166/wst.1991.0466.
Full textAbstract:
Anaerobic treatment systems have been successfully applied over the last decade for combating wastewater pollution loads in the forest industry. However, anaerobic treatment of certain paper mill waste streams is limited by the presence of toxic and recalcitrant organic compounds, high concentrations of sulfur and in some cases high wastewater temperatures. Nonetheless, the future perspectives for the anaerobic treatment of difficult forest industry wastewaters are encouraging. This paper discusses a variety of measures available to anaerobic treatment technologies for dealing with the aforementioned limitations.
17
Gao, Lihui, Shulei Li, Yongtian Wang, and Hao Sun. "Organic pollution removal from coke plant wastewater using coking coal." Water Science and Technology 72, no. 1 (April 30, 2015): 158–63. http://dx.doi.org/10.2166/wst.2015.197.
Full textAbstract:
Abstract Coke plant wastewater (CPW) is an intractable chemical wastewater, and it contains many toxic pollutants. This article presents the results of research on a semi-industrial adsorption method of coking wastewater treatment. As a sorbent, the coking coal (CC) was a dozen times less expensive than active carbon. The treatment was conducted within two scenarios, as follows: (1) adsorption after biological treatment of CPW with CC at 40 g L−1; the chemical oxygen demand (COD) removal was 75.66%, and the concentration was reduced from 178.99 to 43.56 mg L−1; (2) given an adsorption by CC of 250 g L−1 prior to the biological treatment of CPW, the eliminations of COD and phenol were 58.08% and 67.12%, respectively. The CC that adsorbed organic pollution and was returned to the coking system might have no effect on both coke oven gas and coke.
18
Tumurova, T. B., D. V. Shalbuev, V. D. Radnaeva, and I. Byambaa. "Biopolymer Production from Organic Wastes." Ecology and Industry of Russia 26, no. 4 (April 6, 2022): 9–13. http://dx.doi.org/10.18412/1816-0395-2022-4-9-13.
Full textAbstract:
Presents a possibility of reducing the technological cycle of biopolymer production from organic wastes of leather and fur industries by 2.2 times vs. known methods by optimizing raw material pre-preparation for dissolution. The accelerated method of biopolymer production makes possible its physical and chemical properties preservation, increase its clean content increase, as well as reduce wastewater pollution by sodium hydroxide and sulfide, water consumption, wastewater disposal, materials and electricity consumption for its production.
19
Cotman, M., J. Zagorc-Koncan, and A. Droic. "Study of impacts of treated wastewater to the Krka river, Slovenia." Water Science and Technology 44, no. 6 (September 1, 2001): 47–54. http://dx.doi.org/10.2166/wst.2001.0337.
Full textAbstract:
Surface waters are used for disposal of treated effluents from wastewater treatment plants. These effluents usually contain only small amounts of various contaminants but these harmful components accumulate over time in the river, especially in sediments. An integrated approach for the evaluation of the impact of treated effluents was used to predict an ecological risk assessment to the Krka river beside Novo Mesto. The effluents from pharmaceutical and municipal wastewater treatment plants were discharged too closely into the receiving stream, so that separate impacts could not be distinguished. Biologically treated industrial effluents contained great amounts of barely biodegradable organic pollution, organic nitrogen, ammonia and phosphorus, and sometimes zinc. The toxicity of effluents was mostly dependent on their chemical composition. The municipal discharge contained greater amounts of organic pollution that was completely biodegraded but still had a great nutrient pollution load. The effluents were nontoxic. The harmful substances from the effluents were traced in the river. In the downstream site slightly higher concentration of organic pollutants, organic nitrogen, phosphorus, and zinc were detected due to discharges. The river water was over-saturated with oxygen, especially in the summer. In toxicity tests, samples of the river water were nontoxic. Sediments at the downstream site accumulated from discharged organic nitrogen, phosphorus, or zinc. The results of our study show that the main problem is eutrophication of the river Krka, so it is obvious we must reduce the quantity of nutrients in the effluents from wastewater treatment plants. In both effluents it will be necessary to reduce the polluting load of phosphorus, the limiting element for growth of algae and macrophytes in the receiving stream. In the industrial effluent it will be necessary to reduce substances which cause toxicity, such as zinc and nonbiodegradable organic compounds that may be accumulated in the water ecosystem over time.
20
Kurek, Karolina, Piotr Bugajski, Agnieszka Operacz, Paulina Śliz, and Krzysztof Jóźwiakowski. "Influence of variability in the amount of inflow wastewater pollution concentration in small sewer system (case study)." E3S Web of Conferences 86 (2019): 00028. http://dx.doi.org/10.1051/e3sconf/20198600028.
Full textAbstract:
The aim of study was the analyze of the impact of hydraulic load on the changes in the concentration of pollution indicators in raw sewage in years 2009-2014 in the small wastewater treatment plant. Qualitative analysis for raw sewage was included three parameters: total suspension solid, BOD and COD. The characteristics relation between the concentration of pollution indicators in raw sewage (depend variable) from the hydraulic load(independent variable) was presented by the Pearson linear correlation. In the 6 year study period were collected 32 samples of raw wastewater. Based on the result of linear regression analysis, showed that along with the increasing amount of wastewater in the sewer decrease the concentration of pollutions in raw wastewater. For total suspension solid, increase by 1 m3 of quantity of raw sewage inflowing to wastewater treatment plant, causes a decrease in the concentration of this indicator by 0,53 g·m-3. For the both organic indicators (BOD and COD), the was found that an increase of 1 m3 the amount of raw sewage inflowing to wastewater treatment plant, caused a decrease of 0,75 gO2·m-3 BOD value and 0,66 gO2·m-3 COD value in raw sewage.
21
Daouda, Mohamed M. Arêmou, S. Peace Hounkpè, M. Belfrid Djihouessi, A. V. Onesime Akowanou, Martin Pépin Aïna, and Patrick Drogui. "Physicochemical assessment of urban wastewater of Cotonou (Benin)." Water Science and Technology 83, no. 6 (February 17, 2021): 1499–510. http://dx.doi.org/10.2166/wst.2021.073.
Full textAbstract:
Abstract The present study aims to fill the data gap analysis in urban wastewaters characteristics in Benin and its statistical analysis. Physicochemical parameters such as pH, electrical conductivity (EC), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD5), Total Kjeldahl Nitrogen (TKN), Total Phosphorus (TP) and UV Absorbance at 254 nm, were determined on domestic (greywater and blackwater) and industrial (hospital, pharmaceutical and commercial laundry) wastewater in Cotonou city. Analysis of variance showed a strong significant difference in the physico-chemistry of the various effluents. The pharmaceutical wastewater has the highest concentration of organic pollution (COD = 5,912 ± 1,026 mg/L, Abs.UV254 = 2.667 ± 0.327 cm−1). The organic load of blackwater is mainly in particulate and biodegradable form. Besides, the correlation study showed the limits of pH and EC as an indicator of organic load. Furthermore, the choice of COD or BOD5 as the main design parameter would be limited to blackwater treatment. Abs.UV254 was found to be the parameter having a strong relationship with other parameters of all effluents except blackwater. It then takes priority over COD for the treatment of greywater and industrial wastewater. For future wastewater treatment plant design, we recommend to consider Abs.UV254 as an important parameter.
22
Iurchenko, Valentyna, Kateryna Tsytlishvili, and Myroslav Malovanyy. "Wastewater treatment by conversion of nitrogen-containing pollution by immobilized microbiocenosis in a biodisk installation." Ecological Questions 33, no. 2 (March 24, 2022): 1–17. http://dx.doi.org/10.12775/eq.2022.017.
Full textAbstract:
Experimental works are devoted to research the efficiency of deamonization and de-nitrogenation of wastewater during treatment in a biodisk installation. Working hypothesis - immobilization of the microbiocenosis can provide simultaneous deep treatment of wastewater from organic compounds and inorganic nitrogen-containing compounds. The purpose of this work is to assess the efficiency of purification of highly concentrated organic pollutants and mineralized wastewater from nitrogen compounds in a biodisk installation and to determine the main ecological-trophic groups of microorganisms included in the immobilized nitrogen-transforming microbiocenosis. Methods of research of immobilized microbiocenosis - microbiological. physiological, biochemical (inhibitory experiments), natural and model wastewater - hydrochemical. It has been established that in microbiocenosis immobilized on disks conditions that allow heterotrophic and autotrophic microorganisms to actively metabolize organic and inorganic compounds under aerobic and anoxidic conditions are created. The quantitative indicators of the influence on the kinetics of the processes of the concentration of organic substances in the treated wastewater have been determined. On the basis of microbiological, physiological and biochemical studies in the immobilized microbiocenosis, ammonium-acid bacteria (and, possibly, archaea) nitrite-acid and denitrifying bacteria were found, and in the absence of organic substances in the environment - anammox bacteria. Moreover, in the biofilm that was formed in the absence of organic substances in the environment, the activity of anammox bacteria in deamonization significantly exceeded the activity of ammonium oxidizing bacteria and archaea. The obtained results and quantitative requirements were used in the organization of real wastewater treatment in a biodisc plant in industrial conditions.
23
Prodanovic, Jelena, Marina Sciban, Mirjana Antov, Dragana Kukic, and Vesna Vasic. "Treatment of sugar beet extraction juice stillage by natural coagulants extracted from common bean." Acta Periodica Technologica, no. 46 (2015): 77–89. http://dx.doi.org/10.2298/apt1546077p.
Full textAbstract:
Distillery wastewaters have a great pollution potential, and pollution caused by them is one of the most critical environmental issues. This study is concerned with the coagulation efficiency of a new, environmental friendly, natural coagulant extracted from common bean seeds in the primary treatment of distillery wastewater in the bioethanol production from sugar beet juice. Active coagulation components were extracted from ground seeds of common bean with 0.5 mol/L NaCl. The obtained raw extract was used as a coagulant. The coagulation efficiency was measured by jar test at different pH values of wastewater, and a decrease in organic matter content was determined. The experiments confirmed that natural coagulant from common bean could be successfully used for the treatment of extraction juice distillery wastewater. The highest coagulation efficiencies were achieved at the pH 5.2 with a coagulant dose of 30 mL/L, and at the pH 8.5 with a coagulant dose of 5 mL/L, and they were 64.71% and 68.75% respectively. These encouraging results indicate that natural coagulant from common bean seeds is a potential alternative to conventional chemical coagulant/flocculant agents for treatment of wastewaters.
24
Zgheib, S., M. C. Gromaire, C. Lorgeoux, M. Saad, and G. Chebbo. "Sterols: a tracer of organic matter in combined sewers." Water Science and Technology 57, no. 11 (June 1, 2008): 1705–12. http://dx.doi.org/10.2166/wst.2008.285.
Full textAbstract:
The important organic pollution of combined wet weather flows (WWF), its acute impact on receiving waters have been widely demonstrated. The main three possibly origins for this organic pollution are: runoff water (streets and roofs), wastewater and erosion of sewer sediments in combined sewer system. This work, for tracing the origin of organic particles bound in combined sewer system, has been focused on the innovative use of sterols. So, eight sterols have been selected and analysed for each kind of sample. Results are represented in contents of sterols (μg g−1) and in sterol profiles (%).The comparison of contents and profiles leads the separation between two groups: runoff water, characterized by the total absence of coprostanol, epicoprostanol and coprostanone, and the group of sewer deposits (gross bed sediment (GBS), organic layer (OL), biofilms) and wastewater. Moreover, sewer deposits and wastewater can be distinguished by their sterol contents and profiles. To evaluate their contribution to WWF a comparison between sterol signatures is done which shows that these effluents have a strong similarity in profiles and in contents of sterols to the organic layer.
25
Lv, Zongqing, Xiaoyu Shan, Xilin Xiao, Ruanhong Cai, Yao Zhang, and Nianzhi Jiao. "Excessive greenhouse gas emissions from wastewater treatment plants by using the chemical oxygen demand standard." Science China Earth Sciences 65, no. 1 (November 17, 2021): 87–95. http://dx.doi.org/10.1007/s11430-021-9837-5.
Full textAbstract:
AbstractChemical oxygen demand (COD) is widely used as an organic pollution indicator in wastewater treatment plants. Large amounts of organic matter are removed during treatment processes to meet environmental standards, and consequently, substantial greenhouse gases (GHGs) such as methane (CH4) are released. However, the COD indicator covers a great amount of refractory organic matter that is not a pollutant and could be a potential carbon sink. Here, we collected and analysed COD data from 86 worldwide municipal wastewater treatment plants (WWTPs) and applied a model published by the Intergovernmental Panel on Climate Change to estimate the emission of CH4 due to recalcitrant organic compound processing in China’s municipal wastewater treatment systems Our results showed that the average contribution of refractory COD to total COD removal was 55% in 86 WWTPs. The amount of CH4 released from the treatment of recalcitrant organic matter in 2018 could have been as high as 38.22 million tons of carbon dioxide equivalent, which amounts to the annual carbon sequestered by China’s wetlands. This suggests that the use of COD as an indicator for organic pollution is undue and needs to be revised to reduce the emission of GHG. In fact, leaving nontoxic recalcitrant organic matter in the wastewater may create a significant carbon sink and will save energy during the treatment process, aiming at carbon neutrality in the wastewater treatment industry.
26
Kozlov, Andrey Yu, Maksim V. Dorogov, Natalya V. Chirkunova, Ilya M. Sosnin, Anatolii A. Vikarchuk, and Aleksei E. Romanov. "CuO Nanowhiskers-Based Photocatalysts for Wastewater Treatment." Nano Hybrids and Composites 13 (January 2017): 183–89. http://dx.doi.org/10.4028/www.scientific.net/nhc.13.183.
Full textAbstract:
This article described the photocatalysts for wastewater treatment based on copper oxide (II). Research results of CuO nanowhiskers photocatalytic properties are showedand a series of nanowhiskers tests on organic pollutant (methylene blue)are given. It is shown that the copper oxide nanowhiskers able to purify water from organic pollution.
27
Liu, Xue, Bing Geng, Changxiong Zhu, Lianfang Li, and Frédéric Francis. "An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida." Agronomy 11, no. 5 (April 23, 2021): 833. http://dx.doi.org/10.3390/agronomy11050833.
Full textAbstract:
Dairy cattle farming produces large amounts of wastewater and it causes environmental pollution and eutrophication of rivers, but the nutrients in the waste could be recycled. Here, an improved vermicomposting system was applied to dairy farm wastewater, and wastewater with a nitrogen content of 100 mg/L and 200mg/L tested with different combinations of organic substrates such as cow manure and rice straw in rural solid waste. Results showed that earthworms could continuously grow, wastewater (N 100mg/L) mixed with rice straw corresponding to the most significant gained weight for Eisenia fetida earthworms (2.38 to 9.12-fold), and the earthworms’ weight was positively correlated with the C/N ratio, organic matter content, and pH. Compared to the initial state, the system significantly changed physicochemical parameters in nutrients, such as the percentages of total nitrogen, phosphorous, and potassium, which were found to increase in vermicomposting while organic matter content, C/N ratio, and cellulose declined as a function of the vermicomposting period, and the final vermicompost was better for the absorption of plants. These results suggest that continuous wastewater addition improved the effective transformation of organic waste to allow valorizing a broad range of organic residues, and avoid the risk of environmental pollution in dairy cattle farming.
28
Balkas, I. T., F. Juhasz, U. Yetis, and G. Tuncel. "The Izmir Bay Wastewater Management Project – Economical Considerations." Water Science and Technology 26, no. 9-11 (November 1, 1992): 2613–16. http://dx.doi.org/10.2166/wst.1992.0800.
Full textAbstract:
Izmir Bay is one of the great natural areas of the Mediterranean and compares well with similar coastal areas in the world. Izmir which is the main urban area around the Bay is an important industrial, commercial and cultural focal point. It has the second biggest harbour and is the third largest city in the country. The Izmir metropolitan area has experienced rapid population increase which placed an intense pressure on the environment of the bay, housing, infrastructure and social services. The main sources of pollution in the bay are domestic and industrial effluents which account for 50% of the observed organic pollution. Rivers discharging to the Izmir Bay carry mostly industrial discharges. The main forms of pollution in the Izmir Bay are organic pollution, nutrients, pathogenic organisms and toxic material carried by rivers. Scientific evidence suggests if no pollution control measures are taken immediately pollution in the Bay will soon reach a critical level leading to the collapse in the ecosystem. With this understanding Izmir Sewerage and Stream Control Project which foresees the reestablishment of the Bay's water quality was started in 1983. The preliminary assessment of the costs and benefits of the project suggests that the benefits of the proposed pollution control system could significantly outweigh the costs of the control measures by a factor of about eight.
29
BONDAREV, Andreea, and Catalina-Gabriela GHEORGHE. "The Use of Lignin for Environmental Protection: An Overview of Recent Literature." Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 45, no. 1 (March 15, 2022): 5–8. http://dx.doi.org/10.35219/mms.2022.1.01.
Full textAbstract:
Reducing environmental pollution is a particularly important issue, intensively studied nationally and internationally, as evidenced by the large number of scientific papers published on this topic. Literature studies show that reducing environmental pollution means not only reducing the amount of air / water / soil pollutants but also finding ways to recover waste from industrial activities that will reduce the problems of environmental pollution due to their storage.The materials resulting from the gasification processes of cellulose waste, as well as the materials obtained with the help of cellulose extracted from cellulose waste, were tested in the adsorption processes of some polluting species and the results demonstrated the efficiency of these materials for reducing the environmental pollution. The use of lignin as an adsorbent for the removal of pollutants (organic dyes or metal ions) from industrial wastewater can be considered a viable alternative, which can be a solution to both the problem of lignin recovery and the reduction of pollutant content in industrial wastewater.
30
Ruzhitskaya, Olga A., and Elena S. Gogina. "Removal of Phosphates from Wastewater and Intensify the Biological Wastewater Treatment Process from Organic Pollution." Advanced Materials Research 919-921 (April 2014): 2153–56. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.2153.
Full textAbstract:
The paper presents the results of research studies to determine the degree of influence of reinforced material on the purification process wastewater from phosphates and organic contaminants. The paper presents the results of mathematical description of the laws of the biological purification. Obtained activation coefficient. Shows the effect of reinforced material for phosphate removal from wastewater. Shows the effect of reinforced material on sludge dose and sludge index.
31
Lu, Qinfang, Byung-gon Jeong, Ping Yan, Sohee Kim, Shirong Lai, and Jiancheng Liu. "Analysis of Key Technologies for Industrialized Treatment of Fatty Acid High-Salinity Organic Wastewater." Journal of Korean Society of Environmental Engineers 42, no. 11 (November 30, 2020): 570–79. http://dx.doi.org/10.4491/ksee.2020.42.11.570.
Full textAbstract:
Objectives : Wastewater produced by fatty acid production contains high concentration of organic substances and high concentration of salts (mainly sodium sulfate), causing great pollution to water resources and environment. The pollution prevention and control of this type of wastewater are very necessary. The key to treating this type of wastewater is to remove salts and COD to achieve harmless treatment. This is a problem in wastewater management that has plagued the industry for a long time. This paper proposed a technique suitable for fatty acid high salinity organic wastewater.Methods : First, the industrial treatment technology of organic wastewater with high salinity was introduced and analyzed. Combined with the principle of industrial wastewater treatment, the process route for the treatment of fatty acid high salinity organic wastewater was analyzed and selected. In addition, the key technology and process for anaerobic desalination and COD removal were analyzed and selected.Results and Discussion : According to the unique nature of this type of wastewater mainly containing sulphate salts and the feasibility of industrial production, a special technology combination was proposed to treat this wastewater at this stage. Since this wastewater has a B/C ratio of 0.4 to 0.45, it is easier to use biological treatment method. Thus, the conventional treatment method is pretreatment + biological treatment. Biological enhancement and reactor process optimization can be studied for better efficiency.Conclusions : Considering the high COD and sulphate concentration characteristics of fatty acid high-salinity organic wastewater, high-efficiency anaerobic biochemical treatment is mainly considered. Combined with modern high-efficiency anaerobic suspended sludge granule technology, it was concluded that pretreatment + high efficiency IC anaerobic + secondary biological treatment can achieve industrialized treatment of such wastewater in a targeted, low-cost and reliable way. In the later stage, bio-enhancement of the anaerobic process as well as structural and process optimization of the reactor can be carried out to obtain better technical and economic results in production practice.
32
Hossain, Mohammed Amjed, Nasly Binti Mohamed Ali, and Mir Sujaul Islam. "Source apportionment and quality assessment of surface water using principal component analysis and multiple linear regression statistics." Environment Conservation Journal 14, no. 3 (December 21, 2013): 9–16. http://dx.doi.org/10.36953/ecj.2013.14302.
Full textAbstract:
Principal component analysis (PCA) and multiple linear regressions (MLR) analysis were applied on the data set of surface water quality for source identification of pollution and their contribution on the variation of water quality. Results revealed that, most of the water quality parameters were found to be toxic compare to the national standard of Malaysia. PCA identified the sources as, ionic groups of salts, soil erosion and agricultural runoff, organic and nutrient pollutions from domestic wastewater, industrial sewage and wastewater treatment plants. MLR investigated the contribution of every variable with R= 0.968 and R2=0.934 and it was highly significant (p<0.01).
33
Liu, Jun, Na Ren, Chao Qu, Shanfu Lu, Yan Xiang, and Dawei Liang. "Recent Advances in the Reactor Design for Industrial Wastewater Treatment by Electro-Oxidation Process." Water 14, no. 22 (November 16, 2022): 3711. http://dx.doi.org/10.3390/w14223711.
Full textAbstract:
Refractory organic wastewater mainly includes wastewater from papermaking, textile, printing and dyeing, petrochemical, coking, pharmaceutical and other industries, as well as landfill leachate and its membrane-treated concentrate. The traditional biochemical method is difficult to adapt to its harsh conditions such as high toxicity, high organic load and high salinity. Compared to other methods, the electro-oxidation (EO) process owns the attractive characteristics of being clean and eco-friendly, highly efficient and producing no secondary pollution. EO systems mainly include electrodes, a reactor, a power supply and other basic units. The design of reactors with different electrodes was the key link in the application of EO technology. This paper mainly reported the different configurations of electrochemical reactors (ECRs) for refractory organic wastewater treatment, and summarized the advantages and disadvantages of them, including reactor structure, flow mode, operation mode and electrode construction. Compared with traditional reactors, the improved reactors such as 3D-ECR achieve higher mass transfer efficiency by increasing the contact area between the electrode and the fluid. Additionally, it has a higher removal rate of organics and a lower energy consumption. Finally, the future perspectives of the treatment of refractory organic wastewater by ECRs is discussed. This paper is expected to provide a reliable scientific basis for the real application of EO technology in refractory organic wastewater treatment.
34
Galil, N., and M. Rebhun. "Primary Chemical Treatment Minimizing Dependence on Bioprocess in Small Treatment Plants." Water Science and Technology 22, no. 3-4 (March 1, 1990): 203–10. http://dx.doi.org/10.2166/wst.1990.0202.
Full textAbstract:
In wastewater from small communities, institutions, hotels, camps and tourist areas the major pollutants such as organic matter, oil and grease and organic nitrogen are mainly in particulate form, while the soluble fractions of organics and nitrogen are low. This is due to the short residence times in the sewerage systems preventing decomposition and lysis. Such wastewaters are also characterized by high variations in pollution load, mostly in the particulate fraction. Small plants, treating wastewater for discharge to lakes or rivers, have to remove organic pollutants and nutrients, mainly phosphorus. Chemical flocculation-sedimentation, as primary treatment, was considered a promising process combination to obtain reliable operation and for minimizing effects of variations in flow and load. Two possible process combinations were studied: a. chemical flocculation-sedimentation as primary stage, followed by biotreatment (CBT); b. biotreatment of raw wastewater, followed by chemical flocculation-sedimentation (BCT). It was found that primary chemical treatment by alum, or lime, removes more than 90 percent of the suspended solids, colloids, phosphates, oil and grease; the organic matter as BOD and organic nitrogen removals were about 70 percent. By removing the particulate organic matter and other disturbing factors the successive bioprocess in CBT was substantially improved: the growth rate constants for general biomass and for nitrifiers as well as the removal rates were higher for CBT than for BCT; the critical sludge age for nitrification in CBT was 4 days, as compared to 10 days in BCT. The reduction of organic load by about 70 percent, producing a more uniform influent and the better bio-kinetics achieved in CBT, enable a considerable economy in the bioreactor volume and lower energy requirement. Experimental results showed that the CBT sequence enables lower sludge production containing higher concentrations of solids, most of them inorganic.
35
Sinar Mashuri, Salma Izati, Mohd Lokman Ibrahim, Muhd Firdaus Kasim, Mohd Sufri Mastuli, Umer Rashid, Abdul Halim Abdullah, Aminul Islam, et al. "Photocatalysis for Organic Wastewater Treatment: From the Basis to Current Challenges for Society." Catalysts 10, no. 11 (October 30, 2020): 1260. http://dx.doi.org/10.3390/catal10111260.
Full textAbstract:
Organic pollutants such as dyes, antibiotics, analgesics, herbicides, pesticides, and stimulants become major sources of water pollution. Several treatments such as absorptions, coagulation, filtration, and oxidations were introduced and experimentally carried out to overcome these problems. Nowadays, an advanced technique by photocatalytic degradation attracts the attention of most researchers due to its interesting and promising mechanism that allows spontaneous and non-spontaneous reactions as they utilized light energy to initiate the reaction. However, only a few numbers of photocatalysts reported were able to completely degrade organic pollutants. In the past decade, the number of preparation techniques of photocatalyst such as doping, morphology manipulation, metal loading, and coupling heterojunction were studied and tested. Thus, in this paper, we reviewed details on the fundamentals, common photocatalyst preparation for coupling heterojunction, morphological effect, and photocatalyst’s characterization techniques. The important variables such as catalyst dosage, pH, and initial concentration of sample pollution, irradiation time by light, temperature system, durability, and stability of the catalyst that potentially affect the efficiency of the process were also discussed. Overall, this paper offers an in-depth perspective of photocatalytic degradation of sample pollutions and its future direction.
36
Zewde, Abraham Amenay, Lingling Zhang, Zifu Li, and Emanuel Alepu Odey. "A review of the application of sonophotocatalytic process based on advanced oxidation process for degrading organic dye." Reviews on Environmental Health 34, no. 4 (December 18, 2019): 365–75. http://dx.doi.org/10.1515/reveh-2019-0024.
Full textAbstract:
Abstract Nowadays the use of conventional wastewater treatment methods is becoming increasingly challenging mainly due to the presence of organic matter in wastewater. Therefore, an emerging technology is needed to deal with these highly concentrated and toxic non-biodegradable organic matters. In the last few decades, advanced oxidation process (AOP) has emerged to treat wastewaters discharged from industries. Recently, researchers have shown interest to use the application of ultrasound (US) in photocatalysis, i.e. sonophotocatalysis, to improve the performance of the treatment process in the degradation of organic and inorganic contaminants in aqueous streams. Sonophotocatalysis is the combination of the use of ultraviolet (UV) and US.
37
Abdelkader, Anouzla, Kastali Malika, Mouhir Latifa, Chatoui Mohamed, Haddaji Chaymae, Khattabi Safaa, Madinzi Abdelaziz, and Souabi Salah. "Study of the Pollution Generated by Wastewater from the Refining of Vegetable Oils." International Journal of Membrane Science and Technology 9 (November 1, 2022): 101–15. http://dx.doi.org/10.15379/2410-1869.2022.10.
Full textAbstract:
This study concerns the assessment of the pollution generated by three industrial discharges produced by the Lesieur company in Ain Harrouda for the production of vegetable oils, such as process water (PWW), ACID wastewater (AWW), and refining wastewater. (RWW). This wastewater is heavily loaded with pollutants that could pose serious environmental problems. The concentrations of polluting matter in chemical oxygen demand (COD), Biological Oxygen Demand (BOD), and Total suspended solids (TSS), variable in time, could strongly influence the effectiveness of treatment with sludge currently used by Lesieur. In addition, process wastewater and refining wastewater are loaded with fats and oils with varied concentration between3700 and 6000 mg/l. At the same time, wastewater from leg breaking has a concentration varying between 1000 and 6000 mg/L. Additionally, leg-breaking water has a concentration of Total suspended solids (TSS) varying between 10,000 mg/L and 23,000 mg/L. In comparison, process wastewater and refining water have concentrations (TSS) ranging between 4500 mg/L and 8000 mg/L, related to turbidity exceeding 10000 NTU. Furthermore, COD fluctuates between 700 and 3,400 mg/L and suspended matter between 500 and 8,000 mg/L with average pollution loads of 114 and 358 kg/day, respectively. Indeed, the COD/BOD5 ratio for process wastewater varies between 3 and 7. On the other hand, for basic wastewater, this ratio varies between 3 and 20, which could be due to the quality of wastewater with high polyphenol content. Indeed, refining wastewater has a COD/BOD5 ratio that varies between 2 and 4, which shows that organic matter is biodegradable compared to other types of wastewater. The phenol concentration varies over time and goes from 20 to 125 mg/L, while the surfactants have a variable concentration of 20 and 127 mg/L over time, then increases during the summer, taking into account the increase in market demand.
38
Andreeva, Svetlana. "Improving the efficiency of technological processes for the treatment of highly concentrated wastewater to ensure environmental safety." E3S Web of Conferences 274 (2021): 06007. http://dx.doi.org/10.1051/e3sconf/202127406007.
Full textAbstract:
The complexity of biochemical wastewater treatment is most often due to the presence of a large number of organic impurities, causing the death of the biological community of activated sludge microorganisms. Application of the method of lowering the pH of industrial effluents to minimum value reduces the solubility of organic substances in water, separating them into a separate layer of emulsified wastewater. In this case, the process of removing organic impurities from treated wastewater becomes the most accessible, but also requires solving the problems of technological and environmental safety. Dissolution of wastewater organic impurities separated into a separate layer a solvent – the extractant followed by the extraction of organic components extracted from it, reduces the level of wastewater pollution with organic substances according to the oxidation index (COD) to an acceptable level. The technology of the applied method allows for the final treatment using biological methods; and practically constructively mounts and build a new modernized technological line.
39
Mao, Tian Bin, Bo Yu, and Chun Wu. "Research Advances on the High-Strength Organic Wastewater Treatment." Advanced Materials Research 550-553 (July 2012): 2407–11. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2407.
Full textAbstract:
With the development of chemical and related industry, the quantity of high-strength organic wastewater is growing, which could cause a bigger threat to human health, so it becomes very urgent and essential to research and develop new applicable wastewater treatment technology. The treatment techniques of high-strength organic wastewater at home and abroad were summarized: physical and chemical methods, biological methods and the combined process. The technological process, characters and principle of every method were introduced. These wastewater treatment technologies have some advantages of completely mineralization and degradation of the pollutants, and low risk of secondary pollution. They also have many disadvantages of complex technological process and higher operating cost. Finally, the direction of the research on two-phase combined process was pointed out.
40
Amenorfenyo, David Kwame, Xianghu Huang, Yulei Zhang, Qitao Zeng, Ning Zhang, Jiajia Ren, and Qiang Huang. "Microalgae Brewery Wastewater Treatment: Potentials, Benefits and the Challenges." International Journal of Environmental Research and Public Health 16, no. 11 (May 30, 2019): 1910. http://dx.doi.org/10.3390/ijerph16111910.
Full textAbstract:
Concerns about environmental safety have led to strict regulations on the discharge of final brewery effluents into water bodies. Brewery wastewater contains huge amounts of organic compounds that can cause environmental pollution. The microalgae wastewater treatment method is an emerging environmentally friendly biotechnological process. Microalgae grow well in nutrient-rich wastewater by absorbing organic nutrients and converting them into useful biomass. The harvested biomass can be used as animal feed, biofertilizer, and an alternative energy source for biodiesel production. This review discusses conventional and current brewery wastewater treatment methods, and the application and potential of microalgae in brewery wastewater treatment. The study also discusses the benefits as well as challenges associated with microalgae brewery and other industrial wastewater treatments.
41
Keen, Olya S. "Characterisation of ultraviolet-absorbing recalcitrant organics in landfill leachate for treatment process optimisation." Waste Management & Research: The Journal for a Sustainable Circular Economy 35, no. 3 (November 24, 2016): 325–28. http://dx.doi.org/10.1177/0734242x16678065.
Full textAbstract:
Organics in leachate from municipal solid waste landfills are notoriously difficult to treat by biological processes. These organics have high ultraviolet absorbance and can interfere with the ultraviolet disinfection process at the wastewater treatment plant that receives leachate if the leachate flow contribution is large enough. With more wastewater treatment plants switching to ultraviolet disinfection, landfills face increased pressure to treat leachate further. This study used size exclusion chromatography, fluorescence spectroscopy and ultraviolet/Vis spectrophotometry to characterise the bulk organic matter in raw landfill leachate and the biorecalcitrant organic matter in biologically treated leachate from the same site. The results indicate that biorecalcitrant organics have the polyphenolic absorbance peak at 280 nm, fluorescence peak at 280 nm excitation and 315 nm emission, and molecular size range of 1000–7000 Da, all of which are consistent with lignin. The lignin-like nature of biorecalcitrant leachate organics is supported by the fact that 30%–50% of municipal solid waste consists of plant debris and paper products. These findings shed light on the nature of biorecalcitrant organics in leachate and will be useful for the design of leachate treatment processes and further research on leachate treatment methods.
42
Demirkol, Güler Türkoğlu, Gökhan Balcıoğlu, Nurtaç Öz, Moiz Elnekave, Bülent Armağan, and Neşe Tüfekci. "Determination on inhibition effects of coagulants used in wastewater treatment plants on anaerobic digester." Water Science and Technology 82, no. 9 (September 14, 2020): 1877–84. http://dx.doi.org/10.2166/wst.2020.439.
Full textAbstract:
Abstract Domestic wastewaters causing pollution contain inorganic and/or organic materials. When the domestic wastewater outflows to the receiving waters, it causes physical, chemical, and biological pollution in them, and deteriorates the ecological balance of those waters. In the treatment of wastewater, various treatment methods are available depending on the pollution strength of the wastewater. Besides mechanical and biological methods, wastewater treatment with physicochemical methods is still one of the most effective and economical options. Particularly in wastewater with a high concentration of suspended solids, this method is very successful, and obtaining high suspended solids removal efficiencies is very possible. In this study, the effects of the use of coagulant and coagulant aid to be used in a treatment plant where domestic wastewater treatment is carried out are determined to increase the treatment efficiency of a biological treatment that comes later in the stages of the treatment. The effluent of the pre-settling tank may contain a lot of suspended solids. This presence of excess suspended solids decreases the efficiency at other levels of treatment and causes energy loss. In the experiments, the standard jar and inhibition tests are done as a method. As a result of the conducted studies, it is determined that the FeCl3, Synthetic coagulant LP 526, FeClSO4, and the combination of anionic polyelectrolyte yield the best results in the removal of the parameters of chemical oxygen demand (COD), total suspended solids (TSS), and volatile suspended solids (VSS). While FeCl3, APE 65, APE 85, Synthetic coagulant LP 526, and FeClSO4 did not show any inhibition effect in the sludge, APE 67, CPE 84, and (Al2(SO4)3 are found to cause inhibition in the sludge.
43
Ţurcanu, Anca Andreea, Ecaterina Matei, Maria Râpă, Andra Mihaela Predescu, George Coman, and Cristian Predescu. "Biowaste Valorization Using Hydrothermal Carbonization for Potential Wastewater Treatment Applications." Water 14, no. 15 (July 29, 2022): 2344. http://dx.doi.org/10.3390/w14152344.
Full textAbstract:
In today’s world, due to population increase, there are many alarming and potential catastrophic problems like climate change, environmental pollution and an enormous mass of wastes constantly produced by humankind to find innovative solutions for the management, recycling, and valorization of biowaste from agricultural production, food processing, and organic household residues. The search for sustainable and efficient wastewater treatment technologies has gained scientific interest recently; particular focus is on using biowaste to produce hydrochars (HCs) via the hydrothermal carbonization (HTC) process used as adsorbent materials for dye, heavy metal, and emerging pollutant removal. HTC materials derived from renewable resources are an environmentally friendly and adequate way to adsorb pollutants such as organic and inorganic molecules from wastewaters. This review focuses on the advantages of the HTC process which lead to improved properties of the materials obtained, making them highly efficient in wastewater treatment. The information presented in this paper was derived from the most recent publications in the field. Future perspectives of HC materials should consider the possibilities of scale-up, pretreatment of biowastes, and the optimal parameters of the HTC process to produce HCs applied for pollutant removal from wastewaters.
44
Rame, Rame. "Potential of Catalytic Ozonation in Treatment of Industrial Textile Wastewater in Indonesia: Review." Jurnal Riset Teknologi Pencegahan Pencemaran Industri 11, no. 1 (May 21, 2020): 1–11. http://dx.doi.org/10.21771/jrtppi.2020.v11.no1.p1-11.
Full textAbstract:
Industrial textile wastewater is one of the most heavily polluting in Indonesia. Wastewater from industrial textile contains organic contamination that is very difficult to remove pollutants that remaining even though it has been through the usual wastewater treatment unit installed and bio refractory in nature. Toxic organic compounds discharged from the textile industry, such as colored dyes, heavy metals, and various chemicals, will hurt the environment. These contaminants have been proven toxic to the biotic environment, such as mutagenic, which can increase the incidence of cancer and endocrine disruptor effects. Removal of contaminants from industrial textile wastewater is currently one of the most critical subjects in water pollution prevention. Applications of catalytic ozonation treatment initially, powder catalysts have been employed, and later, the use of activated carbon materials in more advanced catalyst structures reported, and more sophisticated types of catalyst equipment namely carbon nanotube, and nanoparticles. In-depth research on the combination of ozonation and catalytic research of industrial textile wastewater treatment has the potential to become a well-developed approach to treatment industrial textile wastewater. This review provides process principles and characteristics, including the use of various catalysts, variations in reactor design, and application catalytic ozonation in synthetic textile wastewater and real industrial textile wastewater outlined and discussed. Include future research directions of the treatment of industrial textile wastewater in to clean water with drink quality.
45
Dignac, M. F., P. Ginestet, D. Rybacki, A. Bruchet, V. Urbain, and P. Scribe. "Fate of wastewater organic pollution during activated sludge treatment: nature of residual organic matter." Water Research 34, no. 17 (December 2000): 4185–94. http://dx.doi.org/10.1016/s0043-1354(00)00195-0.
Full text
46
Davarnejad, Reza, Jamal Azizi, Amir Joodaki, and Sepideh Mansoori. "Optimization of electro-Fenton oxidation of carbonated soft drink industry wastewater using response surface methodology." Macedonian Journal of Chemistry and Chemical Engineering 39, no. 2 (October 27, 2020): 129. http://dx.doi.org/10.20450/mjcce.2020.2101.
Full textAbstract:
The immense volume of highly polluted organic wastewater continuously generated in the beverage industry urges the design of new types of wastewater treatment plants. This study aimed to evaluate the applicability of the electro-Fenton (EF) technique to reduce organic pollution of real effluent from a carbonated soft drink factory. The impact of various process variables like pH, time, current density, H2O2/Fe2+ molar ratio, and the volume ratio of H2O2/soft drink wastewater (SDW) was analyzed using response surface methodology (RSM). The observed responses were in good agreement with predicted values obtained through optimization. The optimum conditions showed a chemical oxygen demand (COD) removal efficiency of 73.07 %, pH of 4.14, time of 41.55 min, current density of 46.12 mA/cm2, H2O2/Fe2+ molar ratio of 0.9802, and H2O2/SDW volume fraction of 2.74 ml/l. The EF process was able to effectively diminish the organic pollution, reduce the residence time and, therefore, the operating costs.
47
Meng, Yue, and Li Qiang Qi. "The Research of Eutrophic Wastewater Treatment Process Design." Applied Mechanics and Materials 316-317 (April 2013): 268–72. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.268.
Full textAbstract:
The treatment object of this paper is eutrophic organic wastewater, put forth effort to research a processing mode which is low energy consumption, high efficiency, construction and operation cost less .Due to the eutrophic wastewater not only contains a lot of organic matter ,but also contains rich nitrogen and phosphorus ,the effect not beautiful when using general anaerobic treatment .Based on the step anaerobic reaction and step aerobic reaction processing way, through the experiment proved that this method not only can effectively remove organic matter in water pollution, but also can produce methane to use .
48
Zagorc-Koncan, J., and M. Dular. "Evaluation of Toxicity in Receiving Streams." Water Science and Technology 26, no. 9-11 (November 1, 1992): 2357–60. http://dx.doi.org/10.2166/wst.1992.0736.
Full textAbstract:
A laboratory river model for the study of self-purification inhibition in a stream containing toxic substances is presented. It enables an engineering - technological prediction of the impact of toxic substances or wastewaters on dissolved oxygen (DO) profile in an organically polluted river downstream from the point of entry of toxic effluent thus providing rapidly and inexpensively significant design information to an environmental scientist or engineer. The method was applied to the toxicity evaluation of wastewaters from electroplating industry. The effects of copper, cyanide (representing two significant constituents of this type of wastewaters) and wastewater from electroplating industry on the biodegradation of organic municipal pollution in receiving stream were evaluated experimentally.
49
Zagorc-Končan, J., and A. Žgajnar Gotvajn. "Improvement of river water quality - the results of industrial effluent minimisation." Water Science and Technology 42, no. 5-6 (September 1, 2000): 9–14. http://dx.doi.org/10.2166/wst.2000.0488.
Full textAbstract:
The harmful effects of wastewaters on receiving streams, caused by insufficient quality of effluents, inadequate dimensioning and overloading of present treatment plants, as well as the trends of science and technology call for improvement of the treatment technologies, development of advanced treatment processes and above all for waste minimisation in industrial processes to meet the increasing water quality standards. Microbial degradation is crucial in the prediction of the duration and, thereby, the effects of organic pollution in natural waters. Evaluating the fate of biodegradable organic pollution downstream from the discharge seems an appropriate way to follow the effect of pollution and its hazard assessment that dictates needed sanitation measures. This paper is concerned with effluent discharges and with the water receiving such discharges. A practical method for the study of the fate of biodegradable industrial pollution in receiving stream is demonstrated. The impact of wastewater from the synthetic phenol-formaldehyde resin production on Borovnišica river is presented. By comparative investigations, before and after introduction of sanitation measures, the beneficial impact of industrial effluent minimisation and treatment is shown evidently.
50
Lefebvre, Olivier, and René Moletta. "Treatment of organic pollution in industrial saline wastewater: A literature review." Water Research 40, no. 20 (December 2006): 3671–82. http://dx.doi.org/10.1016/j.watres.2006.08.027.
Full text