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Filtration Performance in MSBR (Membrane-Coupled Sequencing Batch Reactor) using a Membrane for Both Filtration and Aeration  

Ryu, Kwan-Young (School of Chemical and Biological Engineering, Seoul National University)
Park, Pyung-Kyu (School of Chemical and Biological Engineering, Seoul National University)
Lee, Chung-Hak (School of Chemical and Biological Engineering, Seoul National University)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.4, 2005 , pp. 337-346 More about this Journal
Abstract
An MSBR using a membrane for not only filtration but also aeration (MA-MSBR) was designed to reduce membrane fouling and to enhance water quality, and compared with an MSBR using a membrane for only filtration (BA-MSBR). COD removal efficiency of the MA-MSBR was similar to that of the BA-MSBR, but membrane performance of the MA-MSBR was better than that of the BA-MSBR. The MA-MSBR had more small particles in mixed liquor, so the specific cake resistance of flocs in the MA-MSBR was higher than that in the BA-MSBR. However, in the aerobic reaction step of the MA-MSBR, air went through membrane pores and out of the membrane surface, so cake layers on the membrane surface and a portion of organics adsorbed on membrane pores could be removed periodically. Therefore, cake resistance, $R_c$, and fouling resistance by adsorption and blocking, $R_f$, for the MA-MSBR increased more slowly than those for the BA-MSBR. Additionally, in order to compare the energy efficiency for two MSBRs, oxygen transfer efficiency and power to supply air into the reactor by a membrane module and a bubble stone diffuser were measured using deionized water. From these measurements, the transferred oxygen amount per unit energy was calculated, resulting that of MA-MSBR was slightly higher than that of BA-MSBR.
Keywords
Wastewater treatment; Sequencing batch reactor (SHR); Membrane; Fouling; Aeration;
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