生物砂滤池不同挂膜方法的试验研究

Experimental Study on Different Biofilm Formation Methods in Biological Sand Filter

根据生物砂滤池的运行特点，通过试验对自然挂膜和接种挂膜两种不同挂膜方法下，各滤柱中的生物量和生物活性，对CODMn、NH4^＋ -N和UV254的去除效果以及运行周期进行了分析研究。结果表明，接种挂膜的启动时间比自然挂膜缩短了6～8d，同时生物量较多，但生物活性比自然挂膜法低12．03％～14．29％；各柱对CODMn、NH4^＋ -N均有很好的去除效果，平均去除率在35％和80％以上；但采用自然挂膜法对污染物的去除效果更佳，特别是对UV254的去除率较接种挂膜法提高了5．01％～10．8％，并且运行周期延长了6～10h，运行更为稳定。

Based on operational characteristics of the biological sand filter, the natural biofilm formation and inoculated biofilm formation methods were compared through experiment, rrhe biomass and biological activity in different column filters, the removal effects of CODMn, NH4^＋ - N and UV254 and the operation periods were analyzed. The results demonstrate that compared with the natural biofilm formation, the start-up time of inoculated biofilm formation is shorter by 6 to 8 d, and the biomass is also greater, but the biological activity is lower by 12.03% to 14.29%. The different column filters using both biofilm formation methods can remove CODMn and NH4^＋ - N effectively at average removal rates of above 35% and 80%, respectively, rrhe natural biofilm formation method has more efficient pollutants removal than the inoculated biofilm formation method. In particular, the UV254 removal rate and operation period of the former are 5.01% to 10.8% and 6 to 10 h more than that of the latter. The operation is more stable.