ClO_2和Cl_2对城市污水再生水消毒效果的比较  

Disinfection of Reclaimed Water of Urban Sewage with ClO_2 and Cl_2

作　　者：梁光 文李敏 

机构地区：[1]中国水利水电第三工程局有限公司,陕西西安710016 [2]西安市环境保护局,陕西西安710068

出　　处：《中国给水排水》2009年第5期103-105,共3页China Water & Wastewater

摘　　要：采用ClO2和Cl2对西安市的城市污水再生水进行消毒,中试结果表明:当ClO2投加量>7.67 mg/L时,经30 min接触消毒后,出水中未检出总大肠菌群,以氯代有机物为代表的消毒副产物(DBPs)较进水没有明显增加,出水的COD和浊度分别平均降低了13.2%和17.9%,色度平均减少了5倍;当Cl2投加量>6 mg/L时,经30 min接触消毒后,出水中未检出总大肠菌群,出水中的二氯甲烷和三氯甲烷浓度是进水中的2～3倍,三卤甲烷含量则达到进水的4～6倍,同时生成少量的二氯一溴甲烷,出水的COD和浊度分别平均降低了17.8%和8.75%,色度减少了5～10倍。ClO2 and Cl2 were used to disinfect the reclaimed water of Xi＇an urban sewage. When the dosage of ClO2 is more than 7.67 mg/L, the total coliform bacteria may not be detected in the effluent after 30 min; the disinfection by-products represented by chlorinated organic compounds in the effluent do not increase obviously, compared with the influent, COD and turbidity of the effluent decrease averagely by 13.2% and 17.9% respectively, and the chromaticity reduces by 5 times. When the dosage of Cl2 is more than 6 mg/L, the total coliform bacteria may not be detected in the effluent after 30 min; the dichloromethane and chloroform concentration in the effluent is 2 to 3 times of that in the influent, the trihalomethanes concentration in the effluent is 4 to 6 times of that in the influent, and bromodichlorometh- ane is found; COD and turbidity of the effluent decrease averagely by 17.8% and 8.75% respectively, and the chromaticity reduces by 5 to 10 times.

关 键 词：城市污水再生水 CLO2 CL2 消毒 

分 类 号：X703[环境科学与工程—环境工程]