循环交替曝气对生活污水脱氮除磷效率的影响
Removal Efficiency of Nitrogen and Phosphorus Using Cyclic Alternating Aeration for Domestic Sewage

为了降低能耗，提高生活污水脱氮除磷效率，精准曝气是最关键因素之一。本文采用活性污泥法，通过微孔曝气，考察了连续式曝气和间歇式曝气循环3次或4次的条件下对生活污水处理300 min后的化学需氧量(COD)、氨氮(NH3-N)和总磷(TP)的浓度变化和去除效率。结果表明，采用连续曝气、3次循环曝气、4次循环曝气三种曝气模式对COD的去除率分别为89.60%、79.20%、85.44%，对NH3-N的去除率分别为81.37%、87.83%、88.73%，对总磷的去除率分别为59.60%、61.87%、62.24%。结果表明，循环曝气可以提高脱氮除磷效率，而且循环次数越多，脱氮除磷效率越高。
In order to reduce energy consumption and improve removal efficiency of nitrogen and phosphorus for domestic sewage treatment, precise aeration is one of the most critical factors. In this paper, the concentration changes and removal efficiency of chemical oxygen demand (COD), ammonia nitrogen (NH3-N) and total phosphorus (TP) after domestic sewage treatment for 300 min under the conditions that continuous aeration or cyclic alternating aeration for 3 or 4 times were investigated by activated sludge method through microporous aeration. The experiments showed that the removal rates of COD, NH3-N and TP were 89.60%, 79.20%, 85.44%; 81.37%, 87.83%, 88.73%; and 59.60%, 61.87%, 62.24%, respectively by continuous aeration, three cycle aeration, and four cycle aeration. The results show that the cycle aeration can improve the efficiency of nitrogen and phosphorus removal, and the more cycles aeration, the higher the efficiency of nitrogen and phosphorus removal.