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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 characteristics of chlorothalonil, a widely used urea herbicide, in the disinfection of drinking water with chloramines were systematically investigated. The effects of chloramine dosage, pH value, bromide ion concentration, Chloramine degradation law. The results showed that the degradation rate of chlorothalonil was slower, and the reaction mechanism was complicated due to the self-degradation reaction of chloramine. With the initial dosage of chloramine gradually increased, the degradation rate of chlorotoluron significantly accelerated; chlorotoluene degradation rate of chlorotoluron significantly changed under different pH values, the degradation rate was faster when the pH value was 6 ~ 7.5, especially The degradation was the fastest at pH 6 and slowed down at pH 4.5. Under different concentrations of bromide background, there was no significant difference in the rate of chlorination degradation of chlorotoluene. Under different water quality background conditions, At 6, chlorotoluene degradation rates of chlorotoluron were significantly different, while chloromethylation degradation rate of chlorotoluron did not change significantly at pH 7.