Lee Hansaem, Han Jonghun, Yun Z
Department of Environmental Engineering, Korea University, Seongbuk-gu, Seoul 136-713, South Korea.
Water Sci Technol. 2009;59(11):2093-9. doi: 10.2166/wst.2009.242.
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.
运行了一个实验室规模的UCT型膜生物反应器（MBR），用于同时去除生物氮（N）和磷（P）。为了研究MBR的生物营养物去除（BNR）特性，该实验室装置采用合成的强废水和弱废水进行进料。对于强废水，实现了氮和磷的同时去除，而使用弱废水则导致氮和磷去除率下降。由于弱废水运行中有机物质有限而产生的循环硝酸盐可能在厌氧区造成了硝酸盐抑制。在采用弱废水的分段进水改造中，系统的氮和磷去除能力均得以恢复，这表明缺氧区用于反硝化的化学需氧量（COD）分配是提高生物除磷的关键。此外，对缺氧区特定磷吸收速率的分析表明，反硝化聚磷菌（dPAO）在去除高达40%的磷以及氮的过程中发挥了重要作用。UCT型MBR的污泥产生特性与具有BNR能力的普通活性污泥相似。
