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| Effect of different anoxic/aerobic volume ratio on activated sludge settleability in A/O system |
| WANG Jie, XUE Tong-lai, PENG Yong-zhen, YANG Xiong, WANG Shu-ying, ZHANG Jian-wei |
| Engineering Research Center of Beijing, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract In order to reveal the corelations of A/O ratio and sludge settleability, the effect of different volume ratio (2/6,4/4,6/2) on activated sludge settleability and community of filamentous fungus was investigated with domestic wastewater as influent during long-term operation. The resuls showed that good settleability of system was maintained when A/O ratio was 2/6, and the dominant filamentous bacteria was Type 0041.When A/O ratio was increased to 4/4 the system occurred bulking sludge with SVI up to 357mL/g, and the dominant filamentous bacteria were Type 0041,Type 1701. When A/O ratio of 6/2 was adopted, the system occurred slightly bulking sludge and realised stable shortcut nitrification and denitrification. So different A/O ratio had great influence on activated sludge settleability, at the same time the intracellular and extracellular storage characteristics of activated sludge and denitrification and phosphorus removal performance of the system were also severely affected.
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Received: 15 July 2015
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