Abstract：
BACKGROUND:A new biological domestic wastewater treatment process, which has been presented these days in activated sludge modification, is Upflow Sludge Blanket Filtration (USBF). This process is aerobic and acts by using a sludge blanket in the separator of sedimentation tank. All biological flocs and suspended solids, which are presented in the aeration basin, pas through this blanket. The performance of a single stage USBF process for treatment of domestic wastewater was studied in laboratory scale. METHODS:The pilot of USBF has been made from fiberglass and the main electromechanical equipments consisted of an air compressor, a mixing device and two pumps for sludge return and wastewater injection. The wastewater samples used for the experiments were prepared synthetically to have qualitative characteristics similar to a typical domestic wastewater (COD= 277 mg/l, BOD(5)= 250 mg/l and TSS= 1 mg/l). RESULTS:On the average, the treatment system was capable to remove 82.2% of the BOD(5) and 85.7% of COD in 6 h hydraulic retention time (HRT). At 2 h HRT BOD and COD removal efficiencies dramatically reduced to 50% and 46.5%, respectively. CONCLUSION:Even by increasing the concentrations of pollutants to as high as 50%, the removal rates of all pollutants were remained similar to the HRT of 6 h.
journal_name
Iran J Public Healthjournal_title
Iranian journal of public healthauthors
Mesdaghinia A,Mahvi A,Saeedi R,Pishrafti Hsubject
Has Abstractpub_date
2010-01-01 00:00:00pages
7-12issue
2eissn
2251-6085issn
2251-6093journal_volume
39pub_type
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