粉煤灰陶粒曝气生物滤池填料处理城市污水N,P研究

利用自制粉煤灰陶粒作为曝气生物滤池填料,对上海某城市污水厂氮、磷的进一步处理进行了现场试验。考察了HRT、填料高度、温度等运行条件对污水处理厂二次沉淀池出水中NH3-N、TN及TP的去除效果的影响。结果表明:HRT越长,NH3-N的去除率效果越好;HRT对TN的去除的影响不明显,在HRT为3.5 h时TP的平均去除率最佳;填料厚度越大,氮磷的去除效果越好;NH3-N的去除效果最好在滤料层0~60 cm段,TP的主要去除区段是0~60 cm段和120~180 cm段;温度低不利于TN、TP的去除。

Study on Removal of Nitrogen and Phosphorus in Municipal Wastewater by Fly Ash Ceramisite as Filler of BAF

Self-made fly ash ceramisite was used in the biological aerated filter (BAF) as the filter material and the advanced treatment of nitrogen and phosphorus was investigated in a sewage treatment plant in Shanghai. The effects of hydraulic retention time (HRT), filling thickness, influent concentration and temperature on ammonia, total nitrogen and total phosphorus removal rate were investigated. The results show that ammonia removal rate tend to increase as HRT increasing. HRT had less effect on the removal of total nitrogen. Total phosphorus removal rate were at a high level with HRT 3.5 h. The removal rate of nitrogen and phosphorus tend to increase as filling thickness increasing. When filling thickness was 60cm, ammonia had better removal rate. Total phosphorus was mainly removed with filling thickness 60 and 180cm. Total nitrogen and total phosphorus removal rate tend to decrease as temperature decreasing.