氯苯对EGSB反应器内颗粒污泥性质影响的研究

A STUDY ON AFFECTION OF CHLOROBENZENE TO ANAEROBIC GRANULAR SLUDGE IN AN EGSB REACTOR

采用EGSB反应器处理含氯苯有机废水 ,主要研究了氯苯对颗粒污泥性质的影响。结果表明 :氯苯对处理葡萄糖自配水的EGSB反应器内颗粒污泥中的细菌有较强毒害作用 ,连续投加低浓度氯苯 72d后 ,扫描电镜观察可发现颗粒污泥表面和内部细菌均明显受到损害 ,停止投加氯苯恢复运行 30d和 5 0d后 ,仍可观察到颗粒污泥内部细菌受损害的现象 ,且部分颗粒污泥内部存在着明显的空洞 ;随着运行时间的延长 ,反应器内颗粒污泥的粒径有较大程度的增大 ;但长期接触氯苯导致部分颗粒污泥解体 ,使得小粒径污泥增多 ,而大粒径污泥相应减少 ;氯苯对颗粒污泥的损害还表现在使大粒径颗粒的沉速减小 。

In this paper, EGSB reactor was used to treat organic wastewater containing chlorobenzene and a study on affection of chlorobenzene to anaerobic granular sludge was conducted The results showed that chlorobenzene was harmful to the anaerobic bacteria of the granular sludge in EGSB reactor treating glucose synthetic wastewater After adding low concentration chlorobenzene continually for 72 days, the obvious damage on the bacteria located on the surface or in the inner part of some granules could be observed under SEM After stopping adding chlorobenzene and the reactor was recovered to operate for 30 and 50 days, the damage could be observed yet, and furthermore, obvious cavities were observed in the center of some granules Along with the operation, diameter of the granules in the reactor became lager But after contacting chlorobenzene for a long time, some of the granules would be disintegrated, resulted in the quantity of the smaller granules increased and that of the larger granules decreased As the damage of chlorobenzene to the granular sludge, the settling velocity of the large granules was reduced, and even some granules floated in the water because of having cavities inside