连续流间歇曝气工艺处理生活污水规律探究

Research of Rules in Continuous Flow-Intermittent Aeration Process for Domestic Sewage Treatment

采用连续流间歇曝气工艺处理生活污水,探究不同间歇曝气方式对连续流反应器中COD、NH_4^+-N、TN、TP去除效果的影响。结果表明,间歇曝气的运行方式有利于抑制污泥膨胀问题;所有工况COD去除率均高于82%,且随着曝气时间的增加而增加,最高可达到92%;出水TP的质量浓度在1.8~5.5 mg/L,平均去除率约为30%,缺氧阶段NO_x^--N(x=2、3)、好氧缺氧交替频率、温度均是影响TP去除效果的因素;进水TN主要以NH_4^+-N的形式存在,出水TN的质量浓度浓度在51~53 mg/L,去除率23.2%~55.8%,反硝化阶段碳源不足是造成TN去除率低的主要因素;NH_4^+-N平均去除率在78%左右,间歇曝气NH_4^+-N的去除效率均高于连续曝气工况。

Using the continuous flow-intermittent aeration process to treat domestic sewage, and the effect of different intermittent aeration patterns on COD, NH_4~＋-N, TN and TP removal efficiency was researched. The results showed that the operation method of the intermittent aeration was conducive to inhibit sludge bulking problem, the COD removal rate was over 82% in all working conditions, and it increased with the increase of time, the maximum removal rate could reach 92%. The mass concentration of TP in effluent was 1.8~5.5 mg/L, the average removal rate was about 30%, the NOx--N（x=2,3） of anoxic phase, aerobic and anaerobic alternating frequency and temperature were the factors that affect TP removal efficiency. NH_4~＋-N was the main existent form of TN in influent, the mass concentrations of TN in effluent was 51~53 mg/L, the removal rate was 23.2%~55.8%, insufficient carbon source in denitrification phase was the main factor for the lower TN removal rate. The average NH_4~＋-N removal rate was around 78%, which showed that NH_4~＋-N removal rate in intermittent aeration conditions were higher than continuous aeration conditions.