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

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

本文主要研究内容

作者(2019)在《Impact of chlorine exposure time on disinfection byproduct formation in the presence of iopamidol and natural organic matter during chloramination》一文中研究指出:Chloramines,in practice,are formed onsite by adding ammonia to chlorinated drinking water to achieve the required disinfection.While regulated disinfection byproducts(DBPs)are reduced during chloramine disinfection,other DBPs such as iodinated(iodo-)DBPs,that elicit greater toxicity are formed.The 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 medium.Barberton SW(BSW)and Cleveland SW(CSW)containing iopamidol were prechlorinated for 5–60 min and afterwards chloraminated for 72 hr with ammonium chloride.Chlorine contact time(CCT)did not significantly impact total organic iodine(TOI)concentrations after prechlorination or chloramination.Concentrations of total organic chlorine(TOCl)formed during prechlorination did not significantly change regardless of pH and prechlorination time,whileTOClappearedtodecreaseafter 72 hrchloraminationperiod.Dichloroiodomethane(CHCl2I)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 CCT.Iodo-HAAs were not formed during prechlorination but were detected after chloramination.Significant quantities of chloroform(CHCl3)and trichloroacetic acid(TCAA)were formed during prechlorination but formation ceased upon ammonia addition.Therefore,prechlorination studies should measure TOX and DBP concentrations prior to ammonia addition to obtain data regarding the initial conditions.

Abstract

Chloramines,in practice,are formed onsite by adding ammonia to chlorinated drinking water to achieve the required disinfection.While regulated disinfection byproducts(DBPs)are reduced during chloramine disinfection,other DBPs such as iodinated(iodo-)DBPs,that elicit greater toxicity are formed.The 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 medium.Barberton SW(BSW)and Cleveland SW(CSW)containing iopamidol were prechlorinated for 5–60 min and afterwards chloraminated for 72 hr with ammonium chloride.Chlorine contact time(CCT)did not significantly impact total organic iodine(TOI)concentrations after prechlorination or chloramination.Concentrations of total organic chlorine(TOCl)formed during prechlorination did not significantly change regardless of pH and prechlorination time,whileTOClappearedtodecreaseafter 72 hrchloraminationperiod.Dichloroiodomethane(CHCl2I)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 CCT.Iodo-HAAs were not formed during prechlorination but were detected after chloramination.Significant quantities of chloroform(CHCl3)and trichloroacetic acid(TCAA)were formed during prechlorination but formation ceased upon ammonia addition.Therefore,prechlorination studies should measure TOX and DBP concentrations prior to ammonia addition to obtain data regarding the initial conditions.

论文参考文献

  • [1].A smart strategy for controlling disinfection byproducts by reversing the sequence of activated carbon adsorption and chlorine disinfection[J]. Jingyi Jiang,Xiangru Zhang.  Science Bulletin.2018(18)
  • [2].Research progress of disinfection and disinfection by-products in China[J]. Xuefeng Sun,Miao Chen,Dongbin Wei,Yuguo Du.  Journal of Environmental Sciences.2019(07)
  • [3].Transformation of sulfamethazine during the chlorination disinfection process: Transformation,kinetics, and toxicology assessment[J]. Yunjia Yang,Jiachen Shi,Yi Yang,Jie Yin,Jing Zhang,Bing Shao.  Journal of Environmental Sciences.2019(02)
  • [4].Carbonaceous and nitrogenous disinfection by-product formation in the surface and ground water treatment plants using Yellow River as water source[J]. Yukun Hou1,2, Wenhai Chu1, Meng Ma2 1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China 2. Zhengzhou Water Supply Corporation, Zhengzhou 450013, China.  Journal of Environmental Sciences.2012(07)
  • [5].Advances in photocatalytic disinfection of bacteria:Development of photocatalysts and mechanisms[J]. Wanjun Wang,Guocheng Huang,Jimmy C.Yu,Po Keung Wong.  Journal of Environmental Sciences.2015(08)
  • [6].Microwave Disinfection in a Ventilation and Air-Conditioning System[J]. LU Zhen1,2,ZHANG Ji-li1,MA Liang-dong1,HE Juan3(1.School of Civil & Hydraulic Engineering,Dalian University of Technology,Dalian,Liaoning 116023,China;2.Municipal and Environmental Engineering Research Center,Shenyang Jianzhu University,Shenyang,Liaoning 110168,China;3.School of Municipal & Environmental Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150090,China).  湖南大学学报(自然科学版).2009(S1)
  • [7].Potential application of high pressure carbon dioxide in treated wastewater and water disinfection:Recent overview and further trends[J]. Huy Thanh Vo,Tsuyoshi Imai,Truc Thanh Ho,Thanh-Loc Thi Dang,Son Anh Hoang.  Journal of Environmental Sciences.2015(10)
  • [8].Mechanisms of ultraviolet disinfection and chlorination of Escherichia coli: Culturability, membrane permeability,metabolism, and genetic damage[J]. Limei Xu,Chongmiao Zhang,Pengcheng Xu,Xiaochang C.Wang.  Journal of Environmental Sciences.2018(03)
  • [9].Design of Water Disinfection Scheme for Rural Drinking Water Safety Project[J]. Qing Lu.  Meteorological and Environmental Research.2013(07)
  • [10].Characteristics of molecular weight distribution of dissolved organic matter in bromide-containing water and disinfection by-product formation properties during treatment processes[J]. Ying Zhang,Ning Zhang,Peng Zhao,Zhiguang Niu.  Journal of Environmental Sciences.2018(03)
  • 论文详细介绍

    论文作者分别是来自Journal of Environmental Sciences的,发表于刊物Journal of Environmental Sciences2019年04期论文,是一篇关于,Journal of Environmental Sciences2019年04期论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自Journal of Environmental Sciences2019年04期论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。

    标签:;  

    :Impact of chlorine exposure time on disinfection byproduct formation in the presence of iopamidol and natural organic matter during chloramination论文
    下载Doc文档

    猜你喜欢