BAF系统中有机物对氨氮去除的影响研究

曝气生物滤池(BAF)处理生活污水和二级处理出水的中试研究表明,COD对氨氮去除效果有重要影响,在进水量为2 m3/h,停留时间为1.12 h,曝气量为8 m3/h的条件下,当COD＞50 mg/L时,氨氮的去除率随COD的增加而下降;当COD＜50 mg/L时,氨氮的去除率随COD的增加而升高;这对解决中水回用中的氨氮去除有重要意义.微生物相分析表明,陶粒上的生物膜中细菌多为有荚膜的异养菌.

Research on the effect of organic matter on ammonia removal rate in biological aerated filter treating wastwater

Pilot scale study of biological aerated filter(BAF) on ammonia removal from sewage treatment and secondary treatment effluent of wastewater treatment plant has been conducted.Effect of chemical oxygen demand(COD) on ammonia removal is summarized as follows.Under the follows conditions,which have inflow of 2 m3/h,hydraulic retention time of 1.12 h,aeration quantity of 8 m3/h,the reduction rate of ammonia decreases with the increase of COD concentration when COD concentration is larger than 50 mg/L,the reduction rate of ammonia increases with the increase of COD concentration when COD concentration is less than 50 mg/L.This conclusion will have significant function on the ammonia removal in regenerated water reuse.Microbe analysis indicates that microbe layer on ceramsite is similar to that of contact oxidation process.Bacterium from bio-membrane are mainly consists of heterophic bacteria with capsule.