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A Study on the Optical Internal Recycle Rate and MLSS Concentration of Membrane Coupled $A_2O$ Process for Wastewater Treatment  

Kim Kwan-Yeop (Department of Civil and Environmental Engineering, Sungkyunkwan University)
Kim Jin-Mo (Department of Civil and Environmental Engineering, Sungkyunkwan University)
Kim Hyung-Soo (Department of Civil and Environmental Engineering, Sungkyunkwan University)
Lee Sang-Bek (Department of Chemical Engineering abd clean Technology Che-Ju National University)
Park Eugene (Department of Chemical Engineering, University of Rhode Island)
Bae Sung-Soo (SK Chemicals Water Environment R&D Center)
Publication Information
Membrane Journal / v.15, no.2, 2005 , pp. 114-120 More about this Journal
Abstract
The purpose of this study is to obtain practical information about membrane coupled $ A_2O$ system for muncipal wastewater treatment. A flat-plate microfiltration (MF) module with a pore size $0.25\;{\mu}m$ was submerged into the aeration basin and treated water was filtrated through the membrane by continuous suction with low pressure. The system was operated with synthetic wastewater to find operational parameters of internal recycle ratio and maximum MLSS showing best water quality and long-term stability. The internal recycle was defined as type 1 for aerobic to anoxic tank and type 2 for anoxic to anaerobic tank, respectively When the flux was maintained at $0.015\;m^3/m^2/hr$ (15 LMH) with 2Q type 1 internal recycle ratio, the optimal operational setting were 10 internal recycle ratio for type 2 and maximum MLSS of 11,000 mg/L among tested conditions. At this condition, removal efficiencies of BOD, CODcr, T-N and T-P showed $97.3\%,\;94.2\%,\;64.0\%,\;63.0\%$, respectively.
Keywords
wastewater treatment; MBR; microfiltration;
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