Impact of chlorine exposure time on disinfection byproduct formation in the presence of iopamidol and natural organic matter during chloramination

作     者：Nana Osei B.Ackerson Alexis H.Killinger Hannah K.Liberatore Thomas A.Ternes Michael J.Plewa Susan D.Richardson Stephen E.Duirk 

作者机构：Department of Civil EngineeringUniversity of Akron Department of Chemistry and BiochemistryUniversity of South Carolina Federal Institute of Hydrology (BfG) Department of Crop Sciences and Safe Global Water Institute and NSF Science and Technology Center of Advanced Materials for the Purification of Water with SystemsUniversity of Illinois at Urbana-Champaign 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2019年第31卷第4期

页      面：204-214页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：supported by the National Science Founda-tion (NSF, project numbers NSF1124865 and NSF1124844) the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG, project number TE 533/4-1) 

主　　题：Prechlorinaton Iopamidol Monochloramine Disinfection byproducts(DBPs) Total organic chlorine(TOCl) Total organic iodine(TOI) 

摘      要：Chloramines,in practice,are formed onsite by adding ammonia to chlorinated drinking water to achieve the required *** regulated disinfection byproducts(DBPs)are reduced during chloramine disinfection,other DBPs such as iodinated(iodo-)DBPs,that elicit greater toxicity are *** objective of this study was to investigate the impact of prechlorination time on the formation of both halogen-specific total organic halogen(TOX)and iodo/chlorinated(chloro-)DBPs during prechlorination/chloramination in source waters(SWs)containing iopamidol,an X-ray contrast *** SW(BSW)and Cleveland SW(CSW)containing iopamidol were prechlorinated for 5–60 min and afterwards chloraminated for 72 hr with ammonium *** contact time(CCT)did not significantly impact total organic iodine(TOI)concentrations after prechlorination or *** of total organic chlorine(TOCl)formed during prechlorination did not significantly change regardless of pH and prechlorination time,whileTOClappearedtodecreaseafter 72 ***(CHCl_2I)formation during prechlorination did not exhibit any significant trends as a function of p H or CCT,but after chloramination,significant increases were observed at pHs 6.5 and 7.5 with respect to ***-HAAs were not formed during prechlorination but were detected after *** quantities of chloroform(CHCl_3)and trichloroacetic acid(TCAA)were formed during prechlorination but formation ceased upon ammonia ***,prechlorination studies should measure TOX and DBP concentrations prior to ammonia addition to obtain data regarding the initial conditions.