摘要
系统研究了广泛应用的脲类除草剂绿麦隆在饮用水氯胺化消毒过程中的降解特性，考察了不同的氯胺投加量、pH值、溴离子浓度、水源等条件下绿麦隆的氯胺化降解规律。结果表明，绿麦隆的氯胺化降解速率较慢，由于氯胺自降解反应的存在，其反应机理也较为复杂。随着氯胺初始投加量逐渐增大，绿麦隆降解速率明显加快；不同pH值下绿麦隆的氯胺化降解速率变化明显，当pH值为6-7．5时降解速率较快，尤其在pH值为6时降解最快，在pH值为4．5时降解最慢；不同的溴离子背景浓度下，绿麦隆的氯胺化降解速率没有明显差异；在不同水质背景条件下，当pH值为6时，绿麦隆的氯胺化降解速率具有明显的差异性，而当pH值为7时绿麦隆的氯胺化降解速率变化不显著。
The degradation of chlortoluron as herbicide and precursor of NDMA under different ex- perimental conditions during chloramination of drinking water chlortoluron during chloramination was relatively low and the due to the chloramine self-decomposition. The higher initial was investigated. The degradation rate of reaction mechanism became more complex dosage of chloramine was applied, the faster degradation rate of chlortoluron was found. The degradation of chlortoluron during chloramination was highly dependent on solution pH values. The peak degradation rates were found when pH values ranged from 6 to 7.5, especially at pH of 6. The lowest degradation rate was found at pH of 4.5. No significant difference in degradation rate of chlortoluron during chloramination was found with the addition of bromide ion. The degradation rate of chlortoluron during chloramination was highly impacted by background of wa-ter conditions at pH of 6. However, no significant difference was found at pH of 7 indeed.
出处
《中国给水排水》
CAS
CSCD
北大核心
2014年第15期61-65,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2012ZX07404-004
2012ZX07408-001)
国家自然科学基金资助项目(51278352)
关键词
饮用水
绿麦隆
氯胺化
drinking water
chlortoluron
chloramination
