effect of dissolved air flotation process on thickening of activated sludge
نویسندگان
چکیده
aims: sludge is an inescapable component of all wastewaters that originated from their treatment. dissolved air flotation (daf) process as an alternative clarifier is used in treatment of drinking water, pretreatment of wastewater, and as a phase separator in sludge activation processes. this study aimed to calibrated the usage of daf process in a laboratory scale and under various conditions, to achieve the optimum efficiency in recycling the activated sludge. instrument & methods: in this experimental study, of kashan's shahid beheshti hospital and immediately transported to the laboratory. the optimal dose of polyaluminum chloride coagulant and ph was determined and then applied in daf process. finally turbidity, electrical conductivity (ec) and total solids (ts) parameters were measured and compared with control sample. findings: the optimal ph and optimal dose of coagulant were 6.5 and 25mg/l, respectively. also optimal process efficiency to reduce ec, ts and turbidity parameters were 23.4, 44.5 and 88%, respectively. conclusion: dissolved air flotation process removes the turbidity, ec and ts effectively; however, it has minimal impact on ec and ts.
منابع مشابه
effect of dissolved air flotation process on recycling activated sludge thickening of wastewater treatment plant of kashan's shahid beheshti hospital
aims: intensification of current environmental legislation leads to an increase wastewater treatment sludge volume. so reducing the sludge volume is considered as a strategy to improve and solve the problems of secondary pollution of sludge. dissolved air flotation (daf) as a substitute clarifier is used for separation of activated sludge liquid-solid phases. the aim of this study was to estima...
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عنوان ژورنال:
international archives of health sciencesجلد ۳، شماره ۴، صفحات ۲۰۱-۲۰۵
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