初沉池-曝气生物滤池工艺处理城市河道污水性能研究

Treatment of sewage from urban river by primary sedimentation tank-biological aerated filter process

采用初沉池-曝气生物滤池工艺处理城市河道污水,主要考察曝气生物滤池在不同停留时间条件下对河道污水中NH3-N的去除效果。结果表明:在城市河道污水NH3-N质量浓度约为8.0 mg/L, HRT分别为29、 39min时,出水NH3-N质量浓度分别降至1.5 mg/L和0.5 mg/L以下;当NH3-N质量浓度约为4.0 mg/L, HRT分别为11、 15 min时,出水NH3-N质量浓度分别降至1.5 mg/L和0.5 mg/L以下。曝气生物滤池可高效去除城市河道污水中NH3-N,并可降解部分CODCr和TP,与加药气浮形成组合工艺处理城市河道污水,可达到消除劣V类水及更高要求。

Using primary sedimentation tank-biological aerated filter process to treat urban river sewage,the influence of HRT on NH3-N removal by biological aerated filter was investigated.The results showed that,using the said process to treat urban river sewage with NH3-N mass concentration of 8.0 mg/L,when the HRT were below 29 and 39 min respectively,the mass concentrations of NH3-N in effluent water decreased to below 1.5 and 0.5 respectively.Treating sewage with NH3-N mass concentration of 4.0 mg/L,when the HRT were 11 and 15 min respectively,the effluent mass concentration of NH3-N decreased to below 1.5 and 0.5 mg/L respectively.It could be seen that,biological aerated filter could remove NH3-N from urban river efficiently and degrade part of CODCr and TP simultaneously,therefore,using the combined process of biological aerated filter and air floatation to treat sewage from urban river,the goal of eliminating V-class water distribution or even higher could be achieved.