Modification of conventional activated sludge process by adding microfiltration type hollow fiber membrane module offers various advantages. The membrane module is immersed directly in the bioreactor to separate the treated water from the sludge and the modified process is called submerged membrane activated sludge process (SMASP). Bench scale SMASP units were operated at constant flux to study the possibility of minimizing the excess sludge production and stable operation at different SRT and BOD loading. The long SRT developed high stabilized MLSS concentration in the bioreactor and decreased the sludge loading rate [kg-BOD/kg-MLSS·d]. In SMASP, very low sludge yield coefficients (0.04–0.09 kg-MLSS/kg-BOD) were obtained at long SRT (500 d) and small BOD loading (≦0.5 kg/(m3·d)) as compared o conventional activated sludge process and these coefficients showed considerable minimization in excess activated sludge production. At the same operation conditions, suction pressure was also maintained low (< 25 kPa), and then SMASP was operated stably for long time (≈200 d).
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Research Article|
November 01 2004
Minimization of sludge production and stable operational condition of a submerged membrane activated sludge process
C.P. Bhatta;
C.P. Bhatta
*Department of Applied Chemistry, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
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A. Matsuda;
*Department of Applied Chemistry, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
E-mail: [email protected]
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K. Kawasaki;
K. Kawasaki
*Department of Applied Chemistry, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
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D. Omori
D. Omori
**Technical Center, Environmental Facilities, Daiki Company, 989-1 Kita-Kume machi, Matsuyama, Ehime 790-0923, Japan
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Water Sci Technol (2004) 50 (9): 121–128.
Citation
C.P. Bhatta, A. Matsuda, K. Kawasaki, D. Omori; Minimization of sludge production and stable operational condition of a submerged membrane activated sludge process. Water Sci Technol 1 November 2004; 50 (9): 121–128. doi: https://doi.org/10.2166/wst.2004.0551
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