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- W1976150629 abstract "Effluent requirements have frequently been established that are more stringent than those traditionally considered possible using biological secondary treatment. We evaluated aeration energy and CO2 emissions using an inorganic polymer coagulant of polysilicato-iron (PSI) as a pre-treatment alternative to an aluminium coagulant. Use of the PSI coagulant for CO2 reduction was evaluated in terms of the effects on the quality of the treated water and overall cost effectiveness using a simplified life-cycle assessment (LCA) technique for a wastewater treatment system in an urban catchment. The water quality improvement effects of the wastewater treatment were evaluated by calculating the flux change according to the water quality characteristics in an urban catchment using a catchment simulator. The system evaluated, in an integrated manner, the quality of the treated water and the CO2 emissions from a wastewater treatment system. The effects of wastewater treatment management measures were assessed by evaluating their CO2 emissions and cost, in addition to the water quality improvement. A flocculating agent was used at a concentration close to the water quality standard, and a major effect was seen in terms of reduced aeration energy costs and CO2 emissions. Model calculations of the cost of using flocculating agents, such as polyaluminium chloride (PAC), PSI, ferric chloride, and a polymer coagulant, indicated that the most economical agent was PSI with a polymer. For a cost burden of about 200 million JPY per year, including the cost of the flocculant and of sludge disposal, the CO2 emissions could be reduced by approximately 30%. Thus, a reduced energy technology was established to optimally manage catchment wastewater." @default.
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- W1976150629 date "2013-12-01" @default.
- W1976150629 modified "2023-10-04" @default.
- W1976150629 title "Estimation of the effects of chemically-enhanced treatment of urban sewage system based on life-cycle management" @default.
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- W1976150629 doi "https://doi.org/10.1016/j.scs.2013.02.003" @default.
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