多点交替进水阶式A^2/O工艺阶段运行时间设置研究

Study on phase running time setup of commutative multi-influent cascade A^2/O process

介绍了新型多点交替进水阶式A^2/O(CMICAO)工艺的运行方式与特点,研究了不同阶段运行时间对污染物去除率的影响.结果表明:在水温23～28℃、水力停留时间10 h、污泥龄12 d和污泥回流比30%时,阶段一至阶段六的适宜运行时间分别为3,3,2,3,3和2 h,工艺出水COD,TP、氨氮和TN平均浓度分别低于55,0.5,5和10 mg/L,去除率分别达到75%,90%,90%和70%以上,反应器中存在着同步硝化反硝化现象和好氧条件下的同步脱氮除磷作用.与传统A^2/O工艺相比,该工艺具有更高的氮磷去除效果,无混合液回流系统,污泥回流比低.

The running manner and cycle setup of commutative muhi-influent cascade A2/O （CMICAO） process are described. The effect of phase running time on the removal efficiencies of pollutants is investigated. At 23- 28 ℃, when the HRT is 10 h, SRT is 12 d and sludge return ratio is 30%, the optimal running times of six phases are 3, 3, 2, 3, 3 and 2 h, respectively. The concentrations of COD, TP, ammonia and TN in the effluent are less than 55, 0. 5, 5 and 10 mg/L, and the removal efficiencies are above 75%, 90%, 90% and70%, respectively. In the reactor, simultaneous nitrification and denitrification happens and the nitrogen and phosphorus are removed at the same time in one aerobic tank. Compared with traditional A2/O process, CMICAO process achieves high phosphorus and nitrogen removal rates without mixed liquid retum system, and with less sludge return ratio.