浸没式双轴旋转厌氧膜生物反应器的膜污染机理研究

Mechanism study of membrane fouling in a submerged double-shaft rotary anaerobic membrane bioreactor

试验研究了新型浸没式双轴旋转厌氧膜生物反应器处理啤酒废水的膜污染机理.分析了膜阻力分布情况和膜污染速率及稳定运行时膜过滤阻力随运行时间变化的阻力模型.结果表明,最初很短时间内膜污染受膜孔堵塞模型控制,之后受泥饼层阻力模型控制,后一阶段是膜污染的主要控制阶段.经过146天的运行,膜污染较轻,过滤阻力随时间增大的速率非常缓慢,并在一定膜转速下,过滤阻力保持不变.证实了系统由双轴旋转膜组件形成的湍流可削弱膜表面的浓差极化及泥饼层的形成,从而有效地控制膜污染.

The mechanism of membrane fouling was studied during the treatment for synthetic brewery wastewater by submerged double - shaft rotary anaerobic membrane bioreactor （SDRAnMBR）. The membrane resistance distribution and membrane fouling velocity and resistance model were analyzed. It was found that, the variation of filtration resistance was fit to the standard blocking filtration model in the early stage, and then fit to cake filtration model in the later stage. The membrane fouling was very slowly and membrane fouling extent was very slight with running time after 146 days. The membrane filtration resistance was immovability when operat- ed at definite membrane rotational speed. It was identified that turbulence coming from membrane rotation of double - shaft rotary could undermine concentration polarization on the membrane surface and formation of cake layer , so as to control the membrane fouling effectively.