BAF与前置反硝化BAF的启动与挂膜对比分析

∶通过曝气生物滤池与前置反硝化曝气生物滤池的启动与挂膜试验,对比分析了两种不同运行方式BAF在挂膜过程中CODCr及NH4 -N去除率随时间变化的特点。结果表明,挂膜过程中,CODCr和NH4 -N去除率的提高不是同步的,生物膜增长过程中,好氧异养菌的增殖速度较快,硝化菌的增殖速度较慢。在试验进水CODCr和NH4 -N条件下,两种运行方式BAF有几乎相同CODCr去除规律,挂膜初期前置反硝化BAF的NH4 -N去除率小于BAF。挂膜启动成功后,两种运行方式BAF的CODCr,NH4 -N平均去除率分别能稳定在70%和90%以上;它们都有良好的去除有机物和硝化能力,但前置反硝化BAF脱氮能力高于BAF;它们的好氧段的生物膜内存在相同的生物相,前置反硝化BAF的缺氧段内存在反硝化作用的生物絮体。

A Contrastive Analysis of Start-up and Film Formation in Biological Aerated Filter and Pre-denitrification Biological Aerated Filter

On the basis of the start-up and film formation test in the BAF and pre-denitrification BAF,a con-trastive analysis is made on the different characteristics of the removal of CODCr and NH4 -N with the time changing in the process of film formation.The test reveals that the removal of CODCr does not keep in pace with that of NH4 -N in the process of film formation,while the increasing rate of the aerobic heterotrophic bacteria is higher than that of the autotrophic nitrobacteria in the process of biological film growth.Under the condition of testing inflow of CODCr and NH4 -N,the BAF of the two methods runs almost the same as the removing CODCr law,the pre-denitrification BAF of NH4 -N removal rate is less than that of BAF in the early of film formation.After the the film starts,both of the removal rate of BAF operation CODCr and NH4 -N are average at 70% and 90%.Both have good ability to remove denitrifying and organic matter.The Nitrogen capacity of pre-denitrifica-tion BAF is higher than that of the BAF;the same biological phase exists in their aerobic biofilm section of the memory,the denitrification biological floc exists in the pre-denitrification of BAF in the memory hypoxia para-graph.