填料强化A/O工艺处理小城镇污水的实验研究

Experimental Study on the Treatment of Small Town Sewage with Filler-Enhanced A/O Process

通过向模拟A/O生化池中投加填料强化该工艺处理小城镇污水的处理效果。结果表明,当O段溶解氧的质量浓度控制在2~3 mg/L,温度控制在28℃,进水p H在7.2~7.8的条件下,该工艺的优化水力停留时间为8 h、污泥回流体积比为20%,模拟装置在该优化工况下运行时,对COD、NH_(4)^(+)-N及TP的平均去除率分别为91.1%、96.3%、73.3%。为提高除磷效果,增加后置化学辅助除磷后,TP平均去除率可达86%,出水中COD、NH(4)^(+)-N含量均能达到GB 18918-2002的一级A标准,TP含量能达到一级B标准,去除效果较好。

By adding fillers to the simulated A/O biochemical pool to enhance the treatment effect of the process in the treatment of small town sewage.The results showed that,when the mass concentration of dissolved oxygen in the O stage was controlled at 2~3 mg/L,the temperature was controlled at 28℃,and the influent pH was 7.2~7.8,the optimal hydraulic retention time of the process was 8 h,and the sludge reflux volume ratio was 20%.The average removal rate of COD,NH(4)^(+)-N and TP was 91.1%,96.3%,and 73.3%,respectively,when the simulation device was operated under the optimal working conditions.In order to improve the phosphorus removal effect,after adding the post chemical-assisted phosphorus removal,the average removal rate of TP could reach 86%,the COD and N(4)^(+)-N content in the effluent could reach the first level A standard of GB 18918-2002,and TP content could reach the first level B standard,and the removal effect was better.