Ho Jaeho, Smith Shaleena, Kim Gyu Dong, Roh Hyung Keun
Doosan Hydro Technology, R&D 9208 Palm River Road, Tampa, FL 33619, USA E-mail:
Water Sci Technol. 2015;72(6):917-27. doi: 10.2166/wst.2015.267.
This study compared and evaluated the performance of a conventional membrane bioreactor (MBR) and a novel reciprocation MBR (rMBR) which used mechanical membrane reciprocation in place of membrane air scouring in pilot-scale tests. Each system was independently operated for 280 days at a local wastewater treatment plant for a parallel assessment of operating performance. The rMBR was found to be more effective than the MBR with regard to operating performance and energy consumption. Inertial forces created by the reciprocating motion shook foulants from the membrane surface. In addition, because of the looseness of the fibers, they moved relative to each other during reciprocation thus preventing sludge clogging inside the fiber bundle. Because the rMBR does not use aeration for membrane cleaning, the membrane tank in the rMBR maintained anoxic conditions, allowing endogenous denitrification in the membrane tank. The rMBR permeate contained an average of 1.7 mg/L total nitrogen (TN) with less than 1 mg/L NO(3)-N, while the TN concentration in the MBR permeate averaged 5 mg/L with 3.5 mg/L NO(3)-N. The specific energy consumption for membrane reciprocation in the rMBR was 0.064 kWh/m(3), while that for air scouring in the MBR was 0.19 kWh/m(3).
本研究在中试规模试验中比较并评估了传统膜生物反应器（MBR）和新型往复式膜生物反应器（rMBR）的性能，其中rMBR采用机械膜往复运动代替膜气洗。每个系统在当地污水处理厂独立运行280天，以并行评估运行性能。结果发现，rMBR在运行性能和能耗方面比MBR更有效。往复运动产生的惯性力将污垢从膜表面抖落。此外，由于纤维的松散性，它们在往复运动过程中相互相对移动，从而防止纤维束内部的污泥堵塞。由于rMBR不使用曝气进行膜清洗，rMBR中的膜池保持缺氧条件，允许膜池内进行内源反硝化。rMBR渗透液的总氮（TN）平均含量为1.7mg/L，硝酸盐氮（NO₃-N）含量低于1mg/L，而MBR渗透液中的TN浓度平均为5mg/L，NO₃-N浓度为3.5mg/L。rMBR中膜往复运动的比能耗为0.064kWh/m³，而MBR中气洗的比能耗为0.19kWh/m³。
