| 紫外/亚硫酸钠还原降解三氯乙酰胺的效能 |
| 摘要点击 1682 全文点击 648 投稿时间：2018-10-16 修订日期：2018-12-07 |
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| 中文关键词 三氯乙酰胺 高级还原 亚硫酸钠 光强 剂量 pH |
| 英文关键词 trichloroacetamide advanced reduction sodium sulfite light intensity dosage pH |
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| 中文摘要 |
| 卤乙酰胺（HAcAms）是一类具有高细胞毒性和高遗传毒性的饮用水含氮消毒副产物（N-DBPs），并在饮用水中被广泛检出，其中三氯乙酰胺（TCAcAm）的毒性显著高于传统DBPs.本实验以配置的TCAcAm溶液作为目标污染物，采用紫外（UV）活化亚硫酸钠（Na2SO3）体系降解水中的TCAcAm，并探究在该体系下光强、还原剂投加剂量（Na2SO3）和pH对还原降解TCAcAm效果的影响.结果表明，采用UV/Na2SO3体系可快速降解TCAcAm，其降解效果与光强、Na2SO3投加剂量和pH均呈正相关，且pH值对反应速率与降解率有显著影响，当pH值从6提高至9，TCAcAm的降解率在反应120 min时从12.8%提高至99.6%.在光强为450 μW·cm-2，pH为9，Na2SO3投加剂量为1.00 mmol·L-1，连续30 min光照条件下，TCAcAm降解率达到99.4%.实验证明UV/Na2SO3体系是一种有效消减TCAcAm的高级还原技术，并且具备还原降解其他卤代DBPs的潜力，可用于饮用水中卤代DBPs的降解. |
| 英文摘要 |
| Haloacetamides (HAcAms) are an emerging class of nitrogenous disinfection by-products (N-DBPs) with high cytotoxicity and genotoxicity, which are widely detected in drinking water. The toxicity of trichloroacetamide (TCAcAm) is significantly higher than traditional DBPs. In this study, ultraviolet (UV) treatment was combined with sodium sulphite (Na2SO3) to remove TCAcAm from water. The effects of different light intensities, different agent dosages (Na2SO3), and pH conditions on the removal of TCAcAm by UV/Na2SO3 advanced reduction process were investigated. The results showed that TCAcAm could be rapidly degraded by the UV/Na2SO3 system. The degradation effect was directly proportional to light intensity, dosage of Na2SO3, and pH. Moreover, the pH had a significant effect on the reaction rate and degradation rate. As the pH increased from 6 to 9, the degradation rate of TCAcAm increased from 12.8% to 99.6%, in 120 min. The removal rate of TCAcAm reached 99.4% when the UV light intensity, pH, Na2SO3 dosage, and reaction time were 450 μW·cm-2, 9, 1.00 mmol·L-1, and 30 min, respectively. The experimental results indicated that the UV/Na2SO3 system is an efficient advanced reduction process for the removal of TCAcAm, and it has the potential to reduce other halogenated DBPs. Therefore, it could be used for the degradation of halogenated DBPs in the treatment of drinking water. |
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