Treatment of Phenol Wastewater by Extractive Membrane Bioreactor
萃取膜生物反应器处理苯酚废水的试验研究

Abstract: Phenol-degrading bacteria were isolated from activated sludge which had been acclimated, and then bacterium solution was prepared. The effects of initiating phenol concentration, reactor temperature etc. on the velocity of membrane extraction and biodegradation were investigated in order to make the comparison of activated sludge and bacterium solution systems of extractive membrane bioreactor (EMB). The results showed that,by using phenol as single carbon resource and increasing the phenol concentration gradually, the removal rate of phenol was more than 99% when the concentration of phenol was 700mg?L-1. Increasing reactor temperature and initiating phenol concentration is propitious to the membrane extraction . There was some phenol accumulation in microbial systerm when the initiating concentration was 2000mg?L-1. The thickness of the membrane-attached biofilm in bacterium solution system was thinner than that in activated sludge system, and it could be controlled by hydrodynamic backwashing. The results of GCMS analysis for the effluent of biodegradation showed that biodegradation of phenol was complete, and there was no residual intermediate product.