Abstract
A pilot-scale submerged membrane bioreactor (SMBR) with anoxic and oxic tanks was operated in an attempt to reduce the problems concerning effective removal of organic matter and nutrients from municipal wastewater. A fl at type membrane with a pore size of 0.038 μm and having a total surface area of 3.60 m2 was used in the experiments. During the operation, MLSS concentration in aeration (oxic) tank of SMBR was maintained at about 5–7 g/l. Influent and effluent pH in the SMBR also changed between 7.3–8.4. Raw wastewater with average chemical oxygen demand (COD): total nitrogen (TN) ratio of 12:2 was treated at various temperatures (10–30 °C) over an interval of about 160 d. When average influent nutrient mass ratio (COD:TN:TP) was 100:8.2:1.2 and BOD5:COD ratio was 0.5, removal efficiencies of COD, BOD5, TSS, TN and TP were 99.1%, 99.3%, 99.4%, 43.4% and 68.2%, respectively. Nitrification occurred in the aerobic reactor with NH4 +–N removal efficiency ranging from 88.7 to 99.7% averaging at 97.8%. Nitrog...
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