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Water Practice & Technology © IWA Publishing 2006 |
doi10.2166/wpt.2006.055
Kinetic estimation of low excess sludge and extracellular polymeric substance accumulation in a vertical submerged membrane bioreactor (VSMBR)
S.R. Chae1, H.S. Chin2
1Department of Socio-Environmental Engineering, Graduate School of Engineering, Hokkaido University, Nishi 8, Kita 13, Kita-ku, Sapporo 060-8628, Japan
2Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
ABSTRACT
The main objective of this study was to investigate reasons of mitigated membrane fouling based on a mathematical prediction of daily excess sludge (DES) and extracellular polymeric substance (EPS) accumulation in a laboratory-scale vertical submerged membrane bioreactor (VSMBR) fed with glucose. Yield coefficient, growth rate, and decay rate of autotrophic and heterotrophic micro-organisms were estimated by measuring oxygen uptake rate (OUR). From kinetic estimation, it was concluded that the DES from the VSMBR was only 4% of the total DES produced by the activated sludge process (ASP). This resulted from the lower yield biomass and the higher decay of heterotrophic biomass in the VSMBR. In part of the experiment, transmembrane pressure (TMP) was affected by a rapid increase in EPS concentration. Later, a second rapid increase of TMP was observed although EPS concentration was stable indicating that the second increase of TMP was caused by interfiber clogging other than EPS accumulation.
Keywords:membrane fouling; VSMBR; oxygen uptake rate; daily excess sludge; extracellular polymeric substance.
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