UV/O_3对亚硝基二甲胺降解产物的控制研究  

Control on Products of NDMA Degradation by UV/O_3

作　　者：徐冰冰[1] 陈忠林[1] 齐飞[1] 杨磊[1] 黄露溪[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《环境科学》2008年第12期3421-3427,共7页Environmental Science

基　　金：国家自然科学基金项目(50578052);新世纪优秀人才支持计划项目(NCET-04-0321)

摘　　要：对UV/O3和UV/H2O22种高级氧化工艺降解水中亚硝基二甲胺(NDMA)和控制二甲胺(DMA)生成的能力进行了比较研究.结果表明,UV/H2O2能够有效降解NDMA,但不能控制NDMA降解产物DMA的生成;UV/O3高级氧化技术不仅能够有效地去除NDMA,同时对DMA的生成量也有很好的控制作用.进一步考察了不同臭氧浓度、溶液pH值以及NDMA初始浓度对UV/O3工艺控制DMA生成量的影响.结果表明,臭氧浓度对UV/O3控制DMA的生成有一定的影响,DMA的生成量随着臭氧浓度的增大而减小,臭氧浓度为6.64 mg.L-1时,降解7.7 mg.L-1NDMA生成DMA的量为0.98 mg.L-1.溶液pH值对UV/O3控制DMA的影响较大,酸性和中性pH条件下,DMA的生成量随着pH的增大略有增加;碱性pH条件下,DMA的生成量明显减小,pH=11.0时降解初始浓度为7.7 mg.L-1的NDMA,DMA的生成量仅为0.3 mg.L-1.NDMA的初始浓度对UV/O3控制DMA的生成也有影响,NDMA初始浓度较小时,UV/O3对DMA生成的控制更为明显.Comparison experiments of two advanced oxidation processes, UV/O3 and UV/H2O2, were carried out to evaluate their degradation effect of N-nitrosodimethylamine （NDMA） and controlling effect of dimethylamine （DMA） formation. The results showed that UV/H2O2 could enhance NDMA degradation, but could not control on the formation of DMA. UV/O3 was not only effective for NDMA degradation, but also was good at controlling on DMA formation. Furthermore, factors affecting the formation of DMA during degradation of NDMA by UV/O3 were studied. The formation of DMA decreased with O3 dosage increasing and DMA was 0.98 mg. L^-1 with 7.7 mg. L^-1 NDMA and 6.64 mg. L^-1 O3 dose. Solution pH had obvious effect on controlling of DMA formation during degradation of NDMA by UV/O3 . The formation of DMA lightly increased with pH increasing from acid to neutral but dramatically decreased in basic aqueous solution. The formation of DMA was only 0.3 mg. L^-1 when the initial concentration of NDMA was 7.7 mg. L^-1 under pH = 11.0 condition. UV/O3 had better controlling of DMA formation with lesser initial concentration of NDMA.

关 键 词：UV/O3 亚硝基二甲胺 二甲胺 氯化消毒 

分 类 号：X703.1[环境科学与工程—环境工程]