sludge anaerobic digestion Articles
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Microwave and its combined processes: an effective way for enhancing anaerobic digestion and dewaterability of sewage sludge?
The enhancement for sludge anaerobic digestion and dewaterability were investigated in sludge pretreated by microwave (MW) and its combined processes. The results showed that microwave and its combined processes can efficiently release soluble organic matter and thus enhance anaerobic digestion of sludge. The cumulative methane production in the test of the MW-H2O2-OH (0.2) process was ...
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Determination of greenhouse gas emission reductions from sewage sludge anaerobic digestion in China
Sewage sludge is a considerable source of greenhouse gas (GHG) emission in the field of organic solid waste treatment and disposal. In this case study, total GHG emissions from sludge anaerobic digestion, including direct and indirect emissions as well as replaceable emission reduction due to biogas being reused instead of natural gas, were quantified respectively. The results indicated that ...
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Application of dried anaerobic digested sewage sludge as phenol biosorbent
Untreated anaerobically digested sewage sludge was used for the first time as a biosorbent for removing phenol from aqueous solution. Results showed that adsorption capacity was influenced by the pH of the aqueous solution with an observed maximum phenol removal at pH around 6–8. The adsorption equilibrium of phenolic compounds was obtained after almost two hours with an adsorption of ...
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The fate and behaviour of organic micropollutants during wastewater treatment processes: a review
The fate and behaviour of selected insecticides, herbicides, and polychlorinated biphenyls during primary sedimentation and secondary biological treatment of waste water are evaluated. The physico-chemical properties (chemical structure, aqueous solubility, octanol/water partition coefficient and Henry's Law constant) of these compounds which dictate the extent and mechanism of their removal ...
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Production of propionic acid-enriched volatile fatty acids from co-fermentation liquid of sewage sludge and food waste using
Propionibacterium acidipropionici Volatile fatty acids (VFA), derived from sludge fermentation, have been used as one effective carbon source for biological nutrient removal, especially favorable with VFA containing with high levels of propionic acid. In this paper, a new fermentation method was employed to significantly produce the propionic acid-enriched VFA from the co-fermentation liquid of sewage sludge and food waste: ...
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Hygienization of sludge through anaerobic digestion at 35, 55 and 60 °C
Legislation in Sweden and the European Union concerning the use of sewage sludge in agriculture is under revision and future concentration limits for pathogens in treated sludge are likely to be expected. The aim of this study was to evaluate the hygienization of Salmonella, Escherichia coli, Enterococcus and Clostridium perfringens through continuous anaerobic digestion at 35, 55 or 60 ...
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Monitoring sewage sludge AD for Southern Water - Case Study
To check sludge AD, Southern Water uses portable biogas analysers specially developed for AD biogas and based on proven methane and associated gas analysis equipment from Geotech. Southern Water has an important routine; every single day it checks the health of its sewage sludge anaerobic digesters on eighteen sites across Hampshire, IoW, Sussex and Kent. There, each day Southern Water treats ...
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Degradation rate of anaerobically digested sewage sludge in soil
The objective of this study was to monitor the degradation and obtain the mineralization fraction of anaerobically digested sludge, also known as digestate, under field conditions, when applied to the surface or incorporated into the soil. Sludge was applied to a dystrophic Inceptisol at a dose of 500 kg ha–1 yr–1 of total nitrogen, where the monitoring period of the mineralization process ...
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Behavior and fate of anthropogenic substances at a Swedish sewage treatment plant
The behavior and fate of anthropogenic substances during sewage treatment were investigated at a sewage treatment plant (STP) in Sweden which uses mechanical, chemical, and biological methods for sewage treatment and anaerobic digestion of sludge. Influent and effluent water, and sludge from two specific treatment sites were sampled. Mass balances were calculated from measured concentrations of ...
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Conversion of sewage sludge to commodity chemicals via syngas fermentation
Gasification of sewage sludge allows the recovery of energy, and produces a mix of CO, CO2 and H2 called synthesis gas (or syngas), which can be fermented by acetogenic bacteria to added-value products. This work presents the conversion of syngas to organic acids and alcohols using both pure and mixed cultures. Pure culture kinetic experiments with Clostridium carboxidivorans P7 resulted in the ...
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Co-digestion of press liquids of source-sorted municipal organic waste in anaerobic sludge treatment of municipal wastewater treatment plants
This paper describes a semi-continuous laboratory-scale investigation of a potential co-substrate for mesophilic anaerobic sludge digestion in a municipal wastewater treatment plant. A feed liquid produced from source-sorted municipal organic waste by pretreatment with a screw press was subjected to the investigation. Quantities produced in press trials as well as the composition of the feed ...
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Toluene in sewage and sludge in wastewater treatment plants
Toluene is a compound that often occurs in municipal wastewater ranging from detectable levels up to 237 μg/L. Before the year 2000, the presence of the aromatic hydrocarbons was assigned only to external sources. The Enhanced Biological Nutrients Removal Processes (EBNRP) work according to many different schemes and technologies. For high-efficiency biological denitrification and ...
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The effect of direct addition of iron(III) on anaerobic digestion efficiency and odor causing compounds
The role of iron addition to sewage sludge prior to anaerobic digestion was evaluated to determine the effect of iron on digestion performance and generation of odor-causing compounds. Hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) were the odorous gases evaluated in this study. Samples were obtained from seven municipal wastewater treatment plants (WWTPs), and batch ...
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Aerobic biological treatment of thermophilically digested sludge
Aerobic biological treatment of digested sludge was studied in a continuously operated laboratory set-up. An aerated reactor was filled with thermophilically digested sludge from the Moscow wastewater treatment plant and inoculated with special activated sludge. It was then operated at the chemostat mode at different flow rates. Processes of nitrification and denitrification, as well as ...
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Co-fermentation of sewage sludge and biowastes
The anaerobic treatment of sewage sludge has a long history in Germany. It began early in the Twentieth Century with the development of the Imhoff tank and has, since then, been con-tinuously further developed. Today, anaerobic sludge digestion is the most widely used process for stabilizing sewage sludges. Digesters, in which a portion of the sewage sludge is converted into utilizable biogas ...
By ORBIT e.V.
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Koyambedu Sewage Treatment Power Plant - Case Study
Established in 1979, Enviro Control Associates (I) Pvt. Ltd. is one of the leading Indian companies operating in the domain of Environmental Engineering. The company has a strong foothold in water treatment, sewage treatment, effluent treatment, municipal solid waste management, tertiary treatment and biogas based energy generation. Under the Chennai City River Conservation Project, the large ...
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Land application of sewage sludge (biosolids) in Australia: risks to the environment and food crops
Australia is a large exporter of agricultural products, with producers responsible for a range of quality assurance programs to ensure that food crops are free from various contaminants of detriment to human health. Large volumes of treated sewage sludge (biosolids), although low by world standards, are increasingly being recycled to land, primarily to replace plant nutrients and to improve soil ...
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Commissioning and re-design of a ”class a” thermal hydrolysis facility for pre-treatment of primary and secondary sludge prior to anaerobic digestion
ABSTRACT Thermal hydrolysis of sewage sludge as a pretreatment technique for producing a “Class A” sludge, with existing (or new) mesophilic anaerobic digestion systems are presently being considered for wastewater treatment plants in the USA and Canada. In Europe, a number of innovative hydrolysis systems have been installed or are planned. One technology sold under the trade name CAMBITM has ...
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Co-composting of sewage sludge and municipal solid waste
Israel production of sewage sludge and MSW grows each year due to the increasing number of modern Wastewater plants that are using activated sludge process and the increasing population. Non-stabilized Sewage sludge is an environmental nuisance due to high level of pathogens, offensive odours, insect attraction and potential water sources pollution. The Haifa region itself, where the study took ...
By ORBIT e.V.
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Silent sentinel role for static gas analyser at United Utilities
Biogas produced by the United Utilities anaerobic digestion sludge plant at Lancaster (Stodday) waste water-treatment runs a brand new 525kW combined heat and power (CHP) engine generating electricity and now operating 24/7. It joins an existing 325kW engine already in service for three years. In addition to biogas from the Stodday mesophilic anaerobic digester, a new enzymic hydrolyser increases ...
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