Biological nitrogen and phosphorus removal in UCT-type MBR process.
Biological nitrogen and phosphorus removal in UCT-type MBR process.
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DOI：
10.2166/wst.2009.242
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Hansaem Lee;Jonghun Han;Z. Yun
中科院分区：
文献类型：
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作者：
Hansaem Lee;Jonghun Han;Z. Yun
在实验室规模的UCT型膜生物反应器(MBR)中同时运行生物脱氮除磷。为考察膜生物反应器的生物脱氮特性，采用人工合成的强、弱废水进行了生物脱氮试验。对于高浓度废水，可实现N、P的同步去除，而对于弱废水，N、P的去除效果较差。由于弱废水运行中有机物含量有限，回收的硝酸盐在厌氧区可能造成硝酸盐的抑制。在对弱废水进行分步进水改造时，系统的除氮除磷能力均得到恢复，说明COD在缺氧区反硝化的分配是提高生物除磷效果的关键。此外，对缺氧区比吸磷率的分析表明，反硝化聚磷菌(DPAO)对磷和氮的去除起到了重要作用。UCT型MBR的产泥特性与具有BNR能力的普通活性污泥相似。
A lab-scale UCT-type membrane bio-reactor (MBR) was operated for biological nitrogen (N) and phosphorus (P) removal simultaneously. In order to examine biological nutrient removal (BNR) characteristics of MBR, the lab unit was fed with a synthetic strong and weak wastewater. With strong wastewater, a simultaneous removal of N and P was achieved while application of weak wastewater resulted in a decrease of both N and P removal. Recycled nitrate due to the limited organic in weak wastewater operation probably caused a nitrate inhibition in anaerobic zone. In step feed modification with weak wastewater, both N and P removal capability recovered in the system, indicating that the allocation of COD for denitrification at anoxic zone was a key to increase the biological P removal. In addition, the analysis on the specific P uptake rate in anoxic zone demonstrated that denitrifying phosphorus accumulating organism (dPAO) played an important role to remove up to 40% of P along with N. The sludge production characteristics of UCT-type MBR were similar to ordinary activated sludge with BNR capability.