{"title":"Removal of 2,6-dichloro-1,4-benzoquinone Precursors during Advanced Water Purification Process","authors":"T. Nakai, K. Kosaka, M. Asami, M. Akiba","doi":"10.1080/01919512.2021.2014333","DOIUrl":null,"url":null,"abstract":"ABSTRACT The fates of 2,6-dichloro-1,4-benzoquinone (DCBQ) precursors were evaluated according to their formation potentials (FPs) upon chlorination during ozone/biological activated carbon treatment at two water purification plants (WPPs). DCBQ-FP levels in raw waters were 19 and 21 ng/L. DCBQ-FPs were slightly reduced by coagulation, sedimentation, and rapid filtration, but to < 8 ng/L by ozonation, in contrast to changes in absorbance at 260 nm and trihalomethane (THM)-FPs. DCBQ-FPs of water after sedimentation at WPP and secondary effluents at sewage treatment plants were decreased to a much greater extent than total THM-FPs at low ozone doses. Thus, ozonation is effective for removal of DCBQ precursors.","PeriodicalId":2,"journal":{"name":"ACS Applied Bio Materials","volume":null,"pages":null},"PeriodicalIF":4.6000,"publicationDate":"2022-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Bio Materials","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/01919512.2021.2014333","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, BIOMATERIALS","Score":null,"Total":0}
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Abstract
ABSTRACT The fates of 2,6-dichloro-1,4-benzoquinone (DCBQ) precursors were evaluated according to their formation potentials (FPs) upon chlorination during ozone/biological activated carbon treatment at two water purification plants (WPPs). DCBQ-FP levels in raw waters were 19 and 21 ng/L. DCBQ-FPs were slightly reduced by coagulation, sedimentation, and rapid filtration, but to < 8 ng/L by ozonation, in contrast to changes in absorbance at 260 nm and trihalomethane (THM)-FPs. DCBQ-FPs of water after sedimentation at WPP and secondary effluents at sewage treatment plants were decreased to a much greater extent than total THM-FPs at low ozone doses. Thus, ozonation is effective for removal of DCBQ precursors.
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