净化低浓度大风量恶臭气体的生物滴滤池中生物膜研究

Study on the Biofilm Characteristics in Biotricking Filter Treating Odour Gas with Large Flow and Low Concentration

摘要:

采用内装塑料片、塑料丝、海绵块的中空鱼网状塑料球为填料的生物滴滤池，对某垃圾压缩站产生的低浓度大风量的含氨臭气进行了近1年的连续脱臭试验。研究了有关的净化效果与生物膜特性。在进口氨气浓度0.8 mg/m³～1.5 mg/m³，风量8000m³/h，停留时间2.5s，氨气去除率为90％以上，达到国家一级排放水平。系统添加营养液时净化效果从75％提高到90％。3种填料的生物膜量、脱氢酶活性及硝化活性速率的排列顺序是：塑料片>塑料丝>海绵，并从工艺及填料方面探讨进一步提高净化效果的技术措施。

关键词:生物滴滤池，氨气，生物膜特性，填料

Abstract:

A biotrickling filter which was packed with plastic striplike material, elasticity threadlike material and sponges was designed to remove odour from garbage compressing station.The air flow was increased to 8000 m³/h to obtain EBRTs of 2.5s. NH₃ elimination capacities were observed. The liquid medium recirculated resulted in an increase of the elimination capacity from η=75% to η= 90%. The biomass and microorganism activity on the filling materials were tested, the results shown that microorganism quantity and activity decreased in the order of plastic striplike material > elasticity threadlike material > sponges. Finally how to improve the treatment efficiency from the aspects of technics and types of film carriers were discussed.

Key words:Biotricking filter, Ammonia, Biofilm pattem, Film carriers