沸石-石英砂生物滤池处理微污染水中试研究

Pilot-Scale Experimental Study of Micropolluted Raw Water with Zeolite-Sand Biofilter

摘要: 通过中试考察了沸石-石英砂双层滤料生物滤池处理微污染水的运行效能, 探讨了生物滤池处理此类水体的可行性.结果表明, 生物滤池可以有效地提高出水水质, 对浊度、COD_Mn、波长为254 mm的紫外吸光度A₂₅₄、NH₃-N和NO₂^--N的去除率分别达到93.5%、38%、40%、95%及100%, 而且工作区间主要集中在滤层上部30 cm内;反冲洗对滤料表面附着的微生物膜影响很小, 生物膜在反冲洗后1² h内能恢复到反冲洗前的水平.因此, 对于该污染水源水, 采用沸石-石英砂生物滤池替代原有普通滤池.

Abstract: The operational performance of zeolite-sand double-layer biofilter is studied to treat micropolluted raw water on an experimental scale.The feasibility of the micropolluted raw water treated by the biofilter is examined.The results show that the treated water quality can be obviously improved and the removal rate of turbidity, COD_Mn, UV₂₅₄, NH₃-N and NO₂^--N has reached to 93.5%, 38%, 40%, 95% and 100% respectively.The removal is handled mostly on the top layer of 30 cm in the biofilter.Backwashing process of the biofilter has little influence on the biofilm, which can be recovered within one to two hours after the backwashing.It is feasible to replace an ordinary filter with zeolite-sand double-layer biofilter in the process of micropolluted raw water treatment.