Online Aeration Backwashing in the Inverse Direction of Effluent Applied in Dynamic Membrane Bio-reactor
逆出水方向曝气反冲洗在动态膜生物反应器中的应用

Aeration in the inverse direction of effluent was applied as the measure of online backwashing to control membrane pollution in the dynamic membrane bio-reactor treating sewage wastewater. When the intensity of aeration were 5.6m3/(m2?h) and the aeration time was 5min, it took 45 min for the dynamic membrane to recover filtration capacity. With the recovery of dynamic membrane filterability, effluent turbidity was below 5 NTU. The backwashing interval of the reactor could maintain as about 15h. SEM pictures showed that online aeration backwashing in the inverse direction of effluent could efficiently destroy part of dynamic membrane layer. After the dynamic membrane recovery, dynamic membrane could check more than 50% TOC of various molecule weights ranging >3 104. Aeration in the inverse direction of effluent was an economical and effective mean of online backwashing in the dynamic membrane bio-reactor.