Abstract：The inactivation of coliforms in secondary effluent by UV irradiation alone and sequential use of UV irradiation and chlorination were investigated. The trihalomethane formation after the combination of treatments was also studied. The results showed that UV dose-inactivation curve tailed when UV dose was higher than 10mJ/cm2. The log inactivation ratio of total coliforms was about 2.5 as UV dose was 80mJ/cm2. Combination of 20 mJ/cm2UV irradiation and 8mg/L chlorination (30min contact time) achieved 7.0-log reduction of total coliforms. The survived total coliforms were less than 3CFU/L after the combination of 20mJ/cm2 UV irradiation and 8mg/L chlorination, or after the combination of 80mJ/cm2 UV irradiation and 3mg/L chlorination. Trihalomethane induced by chlorination was only 10-55mg/L after the combination of treatments. Trihalomethane concentrations were a little higher after 80mJ/cm2 UV irradiation than those after 20mJ/cm2 UV irradiation when the same chlorine dose was performed. Sequential use of UV irradiation and chlorination could improve the disinfection performance and control the disinfection by-product formation.
庞宇辰, 席劲瑛, 胡洪营, 吴乾元, 卢如, 江瑞. 再生水紫外线-氯联合消毒工艺特性研究[J]. 中国环境科学, 2014, 34(6): 1429-1434.
PANG Yu-Chen, XI Jin-Ying, HU Hong-Ying, WU Qian-Yuan, LU Ru, JIANG Rui. Evaluation of sequential use of UV irradiation and chlorination to disinfect reclaimed water. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(6): 1429-1434.
