Factors affecting biological denitrifying dephosphatation in anaerobic/anoxic/aerobic sequencing batch reactor |
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Authors: | LIN Yan WANG Xin-ze YUAN Lin-jiang WANG Zhi-ying KONG Hai-nan |
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Abstract: | This study was conducted to verify and discuss the denitrifying dephosphatation under different levels of nitrate concentration and retention time of anoxic/aerobic process in a Sequencing Batch Reactor (SBR). The results of tests demonstrated that there were two kinds of phosphorus-accumulating organisms (PAOs) in the biological excess phosphorus removal (BEPR) system. One was non-DNPAOs that could only use oxygen as terminal electron acceptors, the other was denitrifying PAOs (DNPAOs) that could use both nitrate and oxygen as terminal electron acceptors. Phosphorus uptake efficiency could be attained under anoxic period ranging from 28.7%-96.7% in an anaerobic/anoxic/aerobic system. Experimental results showed that nitrate concentration and retention time of anoxic/aerobic process were the key factors affecting the course of denitrifying dephosphatation. |
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Keywords: | biological wastewater treatment denitrifying dephosphatation biological phosphorus removal sequencing batch reactor |
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