| 混凝和活性炭吸附去除微污染水源水中DON的研究 |
| 摘要点击 2797 全文点击 2000 投稿时间：2012-07-25 修订日期：2012-09-15 |
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| 中文关键词 微污染水源水 溶解性有机氮 混凝 活性炭吸附 三维荧光光谱 |
| 英文关键词 micro-polluted raw water dissolved organic nitrogen coagulation adsorption by activated carbon 3DEEM |
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| 中文摘要 |
| 溶解性有机氮(dissolved organic nitrogen,DON)作为饮用水中新兴氮消毒副产物(nitrogenous disinfection by-products,N-DBPs)的前体物逐渐受到国内外学者的关注. 为探讨混凝和活性炭吸附对微污染水源水中DON的去除机制,首先测定原水中DON、溶解性有机炭(dissolved organic carbon,DOC)、NH4+-N、UV254、pH和溶解氧(dissolved oxygen, DO) 等指标和DON、DOC分子量分布; 接着通过混凝和活性炭吸附试验来考察原水中DON、DOC和UV254变化,并应用三维荧光光谱对原水中DON变化进行表征. 结果表明,微污染水源水中DON、DOC和UV254分别为1.28 mg·L-1、8.56 mg·L-1和0.16 cm-1,DOC与DON比值(DOC/DON)为6.69 mg·mg-1,SUVA为1.87 m-1·(mg·L-1)-1; 小分子量(<6000)DON占较高比例约为68％,大分子量(>20000)DON占的比例为22％; 当混凝剂投加量为10 mg·L-1,DON的去除率大约为20％,DOC和UV254去除率约26％、70％; 当活性炭投加量为1.0 g,DON、DOC和UV254的去除率大约为60％、35％、100％; 混凝和活性炭吸附组合试验时,对DON、DOC的去除率大约为82％和64％; 三维荧光光谱证实,原水中DON变化与3个主要峰有关,分别代表物质为色氨酸类蛋白质、芳香族类蛋白质和富里酸类物质. |
| 英文摘要 |
| Dissolved organic nitrogen as a precursor of new type nitrogenous disinfection by-products in drinking water attracted gradually the attention of scholars all over the world. In order to explore the mechanism of DON removal in micro-polluted raw water by coagulation and adsorption, water quality parameters, such as DON, DOC, NH4+-N, UV254, pH and dissolved oxygen, were determined in raw water and the molecular weight distribution of the DON and DOC was investigated. The variations in DON, DOC and UV254 in the coagulation and adsorption tests were investigated, and the changes of DON in raw water were characterized using three-dimensional fluorescence spectroscopy. The results showed that DON, DOC and UV254 were 1.28 mg·L-1, 8.56 mg·L-1, 0.16 cm-1, and DOC/DON and SUVA were 6.69 mg·mg-1, 1.87 m-1·(mg·L-1)-1 in raw water, respectively. The molecular weight distribution of the DON in raw water showed a bimodal distribution. The small molecular weight (<6000) fractions accounted for a high proportion of 68% and the large (>20000) fractions accounted for about 22%. The removal of DON, DOC and UV254 was about 20%, 26% and 70%, respectively, in the coagulation test and the dosage of coagulant was 10 mg·L-1. The removal of DON, DOC and UV254 was about 60%, 35% and 100%, respectively, in the adsorption test and the dosage of activated carbon was 1.0 g. In the combination of coagulation and adsorption, the removal of DON and DOC reached approximately 82% and 64%, respectively. 3DEEM revealed that the variation of DON in the coagulation and adsorption tests depended intimately on tryptophan protein-like substances, aromatic protein-like substances and fulvic acid-like substances. |
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