曝气生物滤池处理腈纶废水的启动性能研究

以曝气生物滤池(Biological Aerated Filter,BAF)净化腈纶废水为研究对象,研究了BAF处理腈纶废水的启动规律。试验以陶粒为滤料,在流量为25L/h,曝气量为40L/h的试验条件下,每天测试COD和氨氮的去除率变化情况。BAF对COD,氨氮有一定的去除效果。启动15d后,COD去除率达到65%;18d后,氨氮去除率达到60%以上。镜检表明,填料表面生物膜中均存在着多种微生物和明显的生物相分布。BAF挂膜过程中可以通过氨氮和COD去除率变化,来判断填料挂膜的进程和生物硝化作用进行的程度。

Research on the Start-up Performance of the Biological Aerated Filter for Treating Acrylic Water

A bench scale experimental BAF was established, with which acrylic waste water was treated. The start-up law of BAF in treating the waste water containing acrylic was studied. Ceramsite was used as the filter in BAF. Under the conditions of the flow of 25L/h, aeration rate of 40L/h, the removal rate of COD and ammonia was tested every day. The results demonstrated that the removal rate of COD was about 65% after 15 days; and the removal rate of ammonia was about 60% after 18 days. The result of the optical bio-microscope observation showed that the ecosystem with many kinds of different microbes and distinct biological phase distribution was formed in the BAF. Therefore, the course of biofilm formation and the degree of biological nitrification could be estimated by the change of removal rate of ammonia and COD during the course of the natural start-up of the BAF.