| 城市污水生物脱氮系统出水经氯胺消毒形成NDMA的影响因素研究 |
| 摘要点击 3813 全文点击 1939 投稿时间：2011-07-28 修订日期：2011-12-06 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 生物脱氮系统出水 氯胺消毒 N-亚硝基二甲胺 N-亚硝基二甲胺前体物 影响因素 |
| 英文关键词 effluent of biological nitrogen removal system chloramination disinfection N-nitrosodimethylamine(NDMA) NDMA precursor influencing factors |
|
| 中文摘要 |
| 为了考察城市污水回用时氯消毒过程中NDMA的形成,以2套生物脱氮实验装置厌氧/缺氧/好氧(A/A/O)和缺氧/好氧(A/O)的二沉池出水为对象,研究了氯胺消毒过程中氯胺剂量、pH、NO2--N和NO3--N浓度对N-亚硝基二甲胺(NDMA)形成的影响.结果表明,二沉池出水中仍然含有微量的NDMA前体物,导致了氯胺消毒过程中NDMA的形成,而且NDMA的浓度会随氯胺浓度的增加呈线性增加; 在中性或稍偏碱性(pH 7~8)的条件下,NDMA生成量最大; 二沉池出水中NO2--N和NO3--N的浓度对NDMA的含量皆不会产生明显影响. |
| 英文摘要 |
| In order to investigate the formation of N-nitrosodimethylamine (NDMA) during the chloramination disinfection process for the recycling of municipal sewage, the effluents from two lab-scale biological nitrogen removal systems anoxic/oxic (A/O) and anaerobic/anoxic/oxic (A/A/O) processes were disinfected using chloramine. The effects of chloramine dosage, pH, the concentration of NO2--N and NO3--N on the formation of NDMA were investigated. The results showed that there were trace NDMA precursors existing in the effluents, resulting in the formation of NDMA during chloramination disinfection process; the concentration of NDMA increased linearly with the increase of chloramine dosage. Neutral or light alkaline conditions (pH 7-8) were beneficial to NDMA formation. NO2--N and NO3--N had no significant effects on the formation of NDMA in the process of chloramination. |
