饮用水中卤代苯醌类消毒副产物生成影响研究

Research on influential factors of halobenzoquinones disinfection by-products in drinking water

针对近年发现的可能导致膀胱癌的新型消毒副产物(DBPs)卤代苯醌(HBQs),研究了不同地区管网末端水中卤代苯醌的存在情况,以及不同前体物、pH、氯投加量及溴离子浓度对卤代苯醌生成的影响。结果表明,多数管网末端出水中可检出2,6-二氯苯醌(2,6-DCBQ),浓度范围为6.28~10.75ng/L,2,6-二溴苯醌(2,6-DBBQ)均未检出。腐殖酸、富里酸及酚类化合物氯化过程中能够生成HBQs。以双酚A(BPA)为前体物时,2,6-DCBQ的生成量随pH的提高先升高再降低,pH为6,反应时间为4h时2,6-DCBQ的生成量最高为393.30μg/L。2,6-DCBQ的生成量随氯的投加量增加而增加,投加量超过0.50mmol/L时,2,6-DCBQ的生成量随投加量的增加而减小。提高溴离子浓度后2,6-DBBQ的生成量逐渐升高,2,6-DCBQ的生成量逐渐降低,溴离子浓度为1000μg/L时,2,6-DBBQ的生成量最大,为131.67μg/L。

Halobenzoquinones(HBQs)is a new and uncontrolled disinfection by-product(DBPs),which may lead to bladder cancer.The occurrence in the distribution systems of different areas and the impact of precursors,pH,the chlorine does and the bromide concentration on the formation of halobenzoquinone were studied.It displayed that 2,6-dichloro-1,4-benzoquinone(2,6-DCBQ)could be detected in distribution system water,with the concentration range of 6.28~10.75 ng/L,and 2,6-dibromo-1,4-benzoquinone(2,6-DBBQ)was not detected.Humic acid,fulic acid and phenolic were the potential precursors of HBQs.When bisphenol A(BPA)was used as precursor,the production of 2,6-DCBQ increased firstly and then decreased with the increase of pH.As the pH was 6 and the reaction time was 4 h,the most 2,6-DCBQ was produced,reaching393.30μg/L.The 2,6-DCBQ yield was promoted as the chlorine dosage increased,while lower 2,6-DCBQ concentration was obtained when the chlorine dosage was higher than 0.50 mmol/L.The increase of bromide concentration induced the gradually increase of 2,6-DBBQ and the decrease of2,6-DCBQ formation.As the bromide concentration was 1000μg/L,the maximum of 2,6-DBBQ concentration was obtained,which was 131.67μg/L.