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  

Factors Influencing the Formation of NDMA During Chloramination Disinfection of Effluent from Biological Nitrogen Removal System for the Treatment of Municipal Sewage

作　　者：尚晓玲[1] 李咏梅[1] 

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境科学》2012年第5期1604-1608,共5页Environmental Science

基　　金：国家自然科学基金项目(50878165);教育部新世纪优秀人才支持计划项目(NCET-08-0403)

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.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.

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 

分 类 号：X703.1[环境科学与工程—环境工程]