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EFFECTS OF MICRONUTRIENTS ON BIOLOGICAL TREATMENT EFFICIENCY OF TEXTILE WASTEWATER

By Wei Liang, Hong-ying Hu, Yu feng Guo, Hui Wang, Yu-dong Song and Yu-ling Che.
Source:- Fresenius Environmental Bulletin, Vol-1.6-No 12a:2007.

Abstract: Micronutrients play a very important role in biological processes for waste water treatment. A lot of micronutrients including zinc, copper, manganese and vitamins are required by activated sludge. Adequate trace nutrient concentrations, including vitamins and metal irons, are needed to support all the genera present  in the activated sludge treatment system in order for diverse community to survive. The lack of specific nutrients can result in an unbalanced  mixed culture, leading to poor quality effluent, reduced treatment efficiency and sludge………Know more


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Wastewater treatment optimization with micronutrients

By Derk Z. Maat

Abstract: Municipalities and industried have used biological wasterwater treatment plants for many years. All are faced with the challenge of treating, seperating and disposing of biosolids. A significant portion of operating costs for a wastewater treatment plant is related to providing aeration for various actived sludge processes and to dewatering, handling and dispoding of biosolids……Know more


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Effect of Alternative Nutrient Sources During Anaerobic Degradation of Potato Wastewater

Ignacio Durruty and Jorge Froilán González
Group of Biochemical Engineering, Department of Chemical Engineering, Faculty of Engineering, National University of Mar del Plata, Juan B. Justo, 4302 (7600), Mar del Plata, Bs. Aires, Argentina
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Abstract: The supplementation of nutrients on biological wastewater treatment in many cases may become a relevant part of the treatment cost. In that sense, the finding of new efficient and economic nutrient sources is very important in large scale industrial applications. This work reports on the effect of four readily available alternative nutrient sources during anaerobic degradation of potato wastewater: Peptone, soybean meal, sludge from an aerobic wastewater treatment plant (aerobic sludge) and NH 4 NO 3 plus Micronutrient Supplementation (MS). The addition of alternative nutrient sources changed the rate limiting step from the last steps to hydrolysis in all the cases. While the added soybean meal allowed obtaining the higher final conversion, the degradation rate was slower than the non-supplemented control. The assays with NH 4 NO 3 +MS as nitrogen source presented the highest degradation rate. Moreover both NH 4 NO 3 and MS are needed to improve the degradation rates. The percentage of residual COD after treatment was similar for peptone, aerobic sludge and NH 4 NO 3 +MS test. However, the lowest percentage of residual soluble COD was obtained when the aerobic sludge was used as supplement. The aerobic sludge presented Co and Mo deficiencies. Finally, taking into account the advantages and disadvantages discussed, among those tested, the aerobic sludge seems to be the best alternative nutrient source for industrial applications…….Know more


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CO-MANAGEMENT OF MUNICIPAL SOLID WASTE AND WASTEWATER TREATMENT PLANT SLUDGES USING AN ANAEROBIC COMPOSTING PROCESS

By Daniel Rich Masoud Kayhanian Sharla Hardy George Tchobanoglous
Department of Civil and Environmental Engineering, University of California at Davis
Davis, CA 95616

Abstract: The anaerobic co-composting process is a promising technology for the co-management of various organic fractions of municipal solid waste (MSW) and wastewater treatment plant (WWTP) sludges. In the anaerobic co-composting process, the biodegradable organic fraction of MSW (BOF/MSW) and WWTP sludge are converted biologically to biogas and a stabilized humus material. This technology has the potential to eliminate conventional sludge processing, to divert wastes from landf’dls or combustion facilities, and to produce a high-energy biogas and environmentally safe humus material…….Know more


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Integration of inorganic micronutrients and natural starch based cationic flocculant in primary treated sewage effluent (PTSE) treatment

Wen Xing, Wenshan Guo, Huu-Hao Ngo * , Peter Cullum and Andrzej Listowski
Faculty of Engineering and Information Technology, University of Technology, Sydney,
P.O. Box 123, Broadway, NSW 2007, Australia
E-mail: h.ngo@uts.edu.au

Abstract: In this study, a natural starch based cationic flocculant (SBCF) was firstly evaluated using a granular activated carbon fluidized-bed bioreactor (GAC-FBBR) to treat a high strength synthetic domestic wastewater (primary treated sewage effluent) containing refractory organic matters. The positive effect of SBCF on microorganisms and organic removal was obviously observed. When the optimal dose of SBCF (22 mg/L) combined with three major inorganic micronutrients (CaCl 2 , MgSO 4 and FeCl 3 ) at different concentrations, the best modified dosages of 0.5 mg/L of FeCl 3, 5mg/L of MgSO 4 and 2 mg/L CaCl 2 could significantly improve the microbial activity and organic removal simultaneously…….Know more


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