ClO2和Cl2对城市污水再生水消毒效果的比较

采用CIO2和Cl2分别对西安市城市污水再生水进行消毒中试试验.结果表明:当CIO2投加量大于7.67mg/L,经30 min接触消毒后,出水中未检出总大肠茵群,以氯代有机物为代表的消毒副产物(DBPs)较进水未有明显增加,COD和浊度的平均降幅为13.2%和17.9%,色度减少5度;当Cl2投加量大于6 mg/L,经30 min接触消毒后,出水中未检出总大肠菌群,二氯甲烷和三氯甲烷是进水时的2～3倍,三卤甲烷含量则达到进水时的4～6倍,同时生成少量的二氯一溴甲烷,COD和浊度平均降幅为17.8%和8.75%,色度减少5～10度.

Comparison of Disinfection Effect of ClO2 and Cl2 for Reclaimed Water from Urban Sewage

The experiment,in which the disinfection effect of ClO2 and Cl2 for reclaimed water from urban sewage is compared,is carried out in this paper.The results show that when the adding quantity of ClO2 is larger than 7.67mg/L,after disinfection with 30minutes,no total coli-group is found in the effluent water,representative disinfection by-products,such as chlorinated organic matter,does not increase obviously,the average decrease ratios of COD and the turbidity are 13.2% and 17.9%,respectively,the chromaticity reduces 5 degrees.While,when the adding quantity of Cl2 is larger than 6mg/L,after disinfection with 30minutes,no total coli-group is found in the effluent water,but the contents of dichloromethane and the chloroform in effluent water are 2~3 times than that in influent water,the content of trihalomethanes in effluent water are 4~6 times than that in influent water,moreover,moreover,little quantity of Monobromo-dichloro-methane is founded,the average decrease ratios of COD and the turbidity are 17.8% and 8.75%,respectively,the chromaticity reduces 5~10 degrees.