effect of dissolved air flotation process on recycling activated sludge thickening of wastewater treatment plant of kashan's shahid beheshti hospital
نویسندگان
چکیده
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 estimate the optimum efficiency of daf process for thickening of shahid beheshti hospital's wastewater treatment plant recycling activated sludge in kashan. methods: in this experimental study, daily samples was obtained from the wastewater treatment plant 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: according to this investigation results, the optimal ph and optimal dose of coagulant were 6.5 and 25 mg/l, respectively. also optimal process efficiency to reducing ec, ts and turbidity parameters were 23.35, 44.5 and 88 percent, respectively. conclusion: daf process had the better efficiency to remove the turbidity parameter compared with ts and ec .
منابع مشابه
effect of dissolved air flotation process on thickening of activated sludge
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, ...
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عنوان ژورنال:
international archives of health sciencesجلد ۳، شماره ۴، صفحات ۱۷-۱۸
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