城市污水处理厂尾水消毒应急提标改造研究

在某城市污水处理厂一级A应急提标改造过程中,研究了不同尾水消毒方式的消毒效果,发现当水量高于6500m^3/h时,无法仅通过紫外线消毒使出水水质达到一级A排放标准。可以通过投加2.0mg/L的次氯酸钠,或采用紫外线与投加1.0mg/L的次氯酸钠组合方式使出水粪大肠菌群数稳定达到一级A排放标准。在该污水处理厂应急提标阶段,选择紫外线与次氯酸钠组合的消毒方式,既能够保证出水水质稳定达到一级A排放标准,又可以最大限度节省运行成本。

Emergency Upgrading and Reconstruction of Tail Wastewater Disinfection in a Municipal Wastewater Treatment Plant

The effect of different tail wastewater disinfection methods was studied during emergency upgrading and reconstruction of a municipal wastewater treatment plant to meet the first class A discharge standard. It was found that the effluent quality could not meet the first class A discharge standard only by ultraviolet ( UV ) disinfection when the flow rate of the wastewater was above 6 500 m^3/h. However, the number of effluent fecal coliform could meet the first class A discharge standard by adding 2. 0 mg/L sodium hypochlorite, or adopting combined process of UV and 1. 0 mg/L sodium hypochlorite. The combined disinfection method of UV and sodium hypochlorite could not only ensure the effluent quality always conforming the first class A discharge standard , but also save the operation cost to the greatest extent duiing emergency upgrading and reconstruction of the plant.