| UV/O3对亚硝基二甲胺降解产物的控制研究 |
| 摘要点击 3230 全文点击 1643 投稿时间：2007-11-15 修订日期：2008-01-29 |
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| 中文关键词 UV/O3 亚硝基二甲胺 二甲胺 氯化消毒 |
| 英文关键词 UV/O3 N-nitrosodimethylamine (NDMA) dimethylamine (DMA) chlorination disinfection |
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| 中文摘要 |
| 对UV/O3和UV/H2Ｏ2 2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-1 NDMA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. |
| 英文摘要 |
| 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. |
