Control of aliphatic halogenated DBP precursors with multiple drinking water treatment processes： Formation potential and integrated toxicity

• Published in: Journal of environmental sciences (China) Vol. 58; no. 8; pp. 322 - 330
• Main Authors: Zhang, Yimeng, Chu, Wenhai, Yao, Dechang, Yin, Daqiang
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-08-2017
• Subjects: Bromides; Carbonaceous disinfection by-products (C-DBPs); Charcoal; Chlorine; Disinfectants - analysis; Disinfectants - toxicity; Disinfection; Drinking Water; Drinking water treatment plant (DWTP); Filtration; Formation potential; Iodinated disinfection by-products (I-DBPs); Nitrogen; Nitrogenous disinfection by-products (N-DBPs); Ozone; Toxic risk; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - toxicity; Water Purification - methods; Water Supply; 卤代烃; 常规处理工艺; 控制效率; 氯化消毒副产物; 水处理工艺; 综合毒性; 脂肪族; 饮用; Toxic risk; Carbonaceous disinfection by-products (C-DBPs); Iodinated disinfection by-products (I-DBPs); Formation potential; Nitrogenous disinfection by-products (N-DBPs); Drinking water treatment plant (DWTP)
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2017.03.028

The comprehensive control efficiency for the formation potentials（FPs） of a range of regulated and unregulated halogenated disinfection by-products（DBPs）（including carbonaceous DBPs（C-DBPs）, nitrogenous DBPs（N-DBPs）, and iodinated DBPs（I-DBPs）） with the multiple drinking water treatment processes, including pre-ozonation, conventional treatment（coagulation–sedimentation, pre-sand filtration）, ozone-biological activated carbon（O_3-BAC） advanced treatment, and post-sand filtration, was investigated. The potential toxic risks of DBPs by combing their FPs and toxicity values were also evaluated.The results showed that the multiple drinking water treatment processes had superior performance in removing organic/inorganic precursors and reducing the formation of a range of halogenated DBPs. Therein, ozonation significantly removed bromide and iodide,and thus reduced the formation of brominated and iodinated DBPs. The removal of organic carbon and nitrogen precursors by the conventional treatment processes was substantially improved by O_3-BAC advanced treatment, and thus prevented the formation of chlorinated C-DBPs and N-DBPs. However, BAC filtration leads to the increased formation of brominated C-DBPs and N-DBPs due to the increase of bromide/DOC and bromide/DON.After the whole multiple treatment processes, the rank order for integrated toxic risk values caused by these halogenated DBPs was haloacetonitriles（HANs）》haloacetamides（HAMs） 〉haloacetic acids（HAAs） 〉 trihalomethanes（THMs） 〉 halonitromethanes（HNMs） 》I-DBPs（I-HAMs and I-THMs）. I-DBPs failed to cause high integrated toxic risk because of their very low FPs. The significant higher integrated toxic risk value caused by HANs than other halogenated DBPs cannot be ignored.