回用生活污水的电化学消毒试验研究

Application of the electrochemical disinfection method to sewage reuse

对北京某中水站回用于杂用水的生活污水进行电化学消毒试验。试验结果表明 ,生活污水经生物接触氧化、活性炭吸附后 ,流经电化学消毒器停留 2 0s、耗电 0 .30kWh/m3 、消毒器出水放置 1h后 ,总大肠菌群数 <3个 /L ,满足生活杂用水的卫生学指标。当余氯浓度及接触时间相等的条件下 ,电化学消毒法的杀菌效果好于加氯消毒。E .coli细胞经电化学消毒和加氯消毒处理后 ,扫描电镜观察的结果表明 :2种方法作用后的细胞在形态上的变化是不相同的 ,说明电化学消毒的消毒机制不仅仅取决于电解产氯的作用 。

The electrochemical (EC) disinfection of the secondary effluent preceded by biological active carbon filter was investigated. The chlorination of the secondary effluent was also studied. The results showed that when the hydraulic retention time (HRT) was 20 s and the power consumption was 0.30 kWh/m 3,the effluent after 1 h from the EC disinfector could meet the standard of the water reuse for lavatory flush, vehicle washing, greenbelt irrigation and so on. When the residual chlorine concentration and the contact time were equal for the effluent from the EC disinfector and the chlorinated wastewater, the efficiency of EC disinfection was higher than that of chlorination. The cells of E.coli treated by the EC disinfection and chlorination were observed by SEM (scanning electron microscope). The photographs showed that morphology of the E.coli cells treated by above methods were different from each other. It was demonstrated that there might be other disinfection factors except for the chlorine originated from electrolysis during the electrochemical process.