Microbial Adaptability to Organic Loading Changes in an Enhanced Biological Phosphorus Removal Process |
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Authors: | Chang Hoon Ahn Jae Kwang Park Kwang Soo Kim |
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Affiliation: | 1Research Associate, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin, 3206 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706-1691; presently, Research Associate, Center for Environmental Biotechnology, Biodesign Institute, Arizona State Univ., Tempe, AZ 85287-5701. E-mail: chang.ahn@asu.edu 2Professor, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin, 3230 Engineering Hall, 1415 Engineering Dr., Madison, WI 53706-1691 (corresponding author). E-mail: jkpark@wisc.edu 3Researcher Fellow, Construction Environment Research Dept., Korea Institute of Construction Technology, 2311 Daewha-Dong, Ilsan-Gu, Goyang-Si, Gyeonggi-Do 411-712, Korea.
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Abstract: | The enhanced biological phosphorus removal (EBPR) performances of phosphate-accumulating organisms (PAOs) under organic loading fluctuations were investigated using a sequencing batch reactor (SBR) with anaerobic/oxic stages. The adaptability of PAOs was evaluated after establishing a normal steady-state condition chemical oxygen demand (CODin)=150 mg/L]. During SBR operation, the initial COD was changed gradually or abruptly. When the initial COD increased gradually from the steady state to 300 mg/L, the biomass increased steadily and the system showed stable EBPR. However, when the initial COD oscillated from 150 to 300 or 50 mg/L abruptly, PAOs could not adapt themselves to these sudden changes, resulting in unstable EBPR. When the organic loading returned to a normal condition, the system was recovered to stable EBPR in 2 days after the high organic loading fluctuation, while it was not after the low organic loading fluctuation. Using fluorescent in situ hybridization technique, Rhodocyclus-related PAO population changes were monitored. It was demonstrated that PAOs would wash out faster under the low organic loading fluctuation than the high organic loading fluctuation. |
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Keywords: | Phosphorus Abatement and removal Organic loads |
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