摘要
通过优化预处理工艺、强化混凝和消毒工艺,控制高含溴微污染水源水消毒后的三卤甲烷,找出使得水厂出厂水三卤甲烷达标的工艺组合。试验结果表明,氯消毒时,强化混凝工艺可去除4%~22%的三卤甲烷(pH值=6.72~8.22),三卤甲烷各单项指标均达标,但是除pH值=6.72外,其他pH值条件下三卤甲烷综合(各单项指标实测浓度与各自限值的比值之和)均超标;高锰酸钾预氧化或粉末活性炭吸附预处理对三卤甲烷的去除率为3%~18%,原水经预处理和强化混凝后,三卤甲烷综合仍然超标;但当采用氯胺或二氧化氯消毒时,在pH值为6.72~8.22条件下,单独混凝工艺即可使消毒后三卤甲烷生成量<20μg/L,且三卤甲烷综合达标(其值为0.016~0.139)。因此,对于采用高含溴微污染水源水的水厂,推荐其采用二氧化氯或氯胺消毒来有效控制三卤甲烷的生成。
In order to make trihalomethanes meet the drinking water standard,the optimized pretreatment process and enhanced coagulation as well as optimized disinfection were used to control the formation of trihalomethanes in source water with high concentration of bromine.The results showed that enhanced coagulation and chlorine disinfection could remove 4%-22%of trihalomethanes(pH=6.72-8.22),each trihalomethane reached the standard,while the combined indicator of trihalomethanes exceeded relevant standards in any pH conditions except 6.72.In addition,after potassium permanganate oxidation or activated carbon adsorption pretreatment,the removal rate of trihalomethanes was 3%-18%,trihalomethanes in raw water still exceeded relevant standards after pretreatment and enhanced coagulation.However,when the pH varied from 6.72 to 8.22,the concentrations of trihalomethanes were lower than 20μg/L and the combined indicator of trihalomethanes met standard(the value varied from 0.016 to 0.139),through enhanced coagulation and chlorine dioxide or chloramine disinfection.Therefore,chlorine dioxide or chloramine disinfection was recommended to replace the chlorine disinfection to control trihalomethanes effectively for water treatment plant whose source water had high concentrations of bromine.
作者
付静
封玲
王小(亻毛)
杨宏伟
解跃峰
FU Jing;FENG Ling;WANG Xiao-mao;YANG Hong-wei;XIE Yue-feng(State Key Joint Laboratory of Environment Simulation and Plution Control,School of Environment,Tsinghua University,Beijing 100084,China;College of Chemical Engineering,Beijing Unirersity of Chemical Technology,Bejing 100029,China;Department of Enironment,State College of Pensyloania State Unirersity,USA)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第21期50-55,共6页
China Water & Wastewater
关键词
高含溴微污染水源水
三卤曱烷
强化混凝
预处理
micro-polluted source water with high concentration of bromine
trihalomethanes
enhanced coagulation
pretreatment
