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 NO-2-N and NO-3-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.NO-2-N and NO-3-N had no significant effects on the formation of NDMA in the process of chloramination.