Effect of disintegrated sludge recycling on membrane permeability in a membrane bioreactor combined with a turbulent jet flow ozone contactor |
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Authors: | Byung-Kook Hwang Chang Hoon Ahn Jae-Yoon Song |
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Affiliation: | a School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea b OXEN Tech, Gangnam-gu, Seoul, Republic of Korea |
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Abstract: | We have combined a turbulent jet flow ozone contactor (TJC) with a membrane bioreactor (MBR) to establish a zero-discharge system in terms of excess sludge in the MBR. The TJC-MBR system was compared with the conventional MBR (Control-MBR) with respect to i) the size and zeta potential of the sludge particles, ii) the loosely bound extra-cellular polymeric substances (EPSs) and tightly bound EPS of the microbial flocs, iii) the porosity and biovolume of the bio-cake accumulated on the membrane, and iv) the membrane permeability. The TJC system generated the ozonated sludge with a negligible amount of loosely bound EPS and a positive zeta potential. As a result, when such ozonated sludge was recycled, the average size of the sludge particles (e.g., microbial flocs) increased in the TJC-MBR. Consequently the bio-cake formed in the TJC-MBR had greater porosity than that in the Control-MBR, giving rise to higher membrane permeability in the TJC-MBR. |
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Keywords: | Membrane bioreactor (MBR) Turbulent jet flow ozone contactor (TJC) Membrane permeability Loosely bound EPS |
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