邯郸市西污水处理厂工艺运行的优化

Optimization of Process for Sewage Treatment Plant in Handan

由于实际进水水质与设计值有偏差,造成采用改良氧化沟工艺的邯郸市西污水处理厂运行管理困难且费用较高。针对该厂的实际运行情况,探讨了曝气系统的DO、MLSS、泥龄等运行参数的控制问题,并对各参数进行了分析、优化调整。结果显示:该厂好氧区出水DO控制在2.5～3.5mg/L,缺氧区DO控制在0.3～0.7mg/L时,可保证良好的除磷效果;将MLSS控制在5000mg/L左右,并通过排泥将泥龄控制在16～19d左右时,氧化沟系统可在最低运行能耗下获得最优硝化、脱氮效果;避免过多的硝酸盐随回流污泥进入厌氧选择池也是该系统工艺控制的关键,适宜的进水BOD5/TN比值以及稳定可靠的反硝化控制,可进一步提高该系统的处理效果,尤其是脱氮效果。

Because of the difference between the practical influent quality and the design value, the sewage treatment plant with the modified oxidation ditch was difficult to be operated in Handan City and the operation cost was high. Aimed at the practical operation situation of the plant, the control problems of operational parameters, such as DO in aeration system, MLSS, sludge age and so on were discussed. By analyzing and optimally adjusting the parameters, the good effects of nitrogen and phosphorus removal were obtained. The results showed that when the DO value in the aerobic zone was 2.5-3.5 mg/L and 0.3N0.7 mg/L in the anoxic zone, the good effect of phosphorus removal was obtained. Under the conditions of MLSS 5 000 mg/L and sludge age 16~ 19 d, the best nitrification and denitrification effects of oxida- tion ditch system under the lowest energy consumption were achieved. To avoid excessive nitrate entering the anaerobic selective basin through return sludge was the key of this process. At the same time,the suitable ratio of BOD5/TN and the stable control of denitrification could imp rove the system effects, especially nitrogen removal.