| FeOOH催化臭氧氧化滤后水中NOM的小分子副产物的生成 |
| 摘要点击 1770 全文点击 1226 投稿时间：2008-03-10 修订日期：2008-09-26 |
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| 中文关键词 催化臭氧氧化 NOM组分 羟基氧化铁 醛 酮 酮酸 可生化性 |
| 英文关键词 catalytic ozonation NOM fractions FeOOH aldehydes ketones ketoacids biodegradability |
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| 中文摘要 |
| 以滤后水中富集、分离出的6种不同特性的天然有机物(NOM)组分为对象,考察了羟基氧化铁（FeOOH）催化臭氧氧化NOM各组分后小分子醛、酮及酮酸副产物的生成情况.发现FeOOH催化氧化比臭氧氧化提高了对NOM 各组分DOC和SUVA的去除率.FeOOH催化氧化并不能有效地降低NOM各组分小分子副产物的产量.催化氧化和臭氧氧化后，憎水中性物质(HON)的醛、酮、酮酸的总产量都最高，NOM碱性组分的小分子副产物产量都相对最低.NOM各组分催化氧化后甲醛和丙酮酸的产量最大，这和单独臭氧氧化的结论一致.特别是HON的甲醛产率占其醛、酮总产量的71.6%，单位DOC丙酮酸的产量达78.6 μg/mg.用NOM组分的小分子副产物折算DOC占各组分氧化后DOC的质量分数来间接显示氧化后剩余DOC的可生物降解性，发现催化氧化比单独臭氧氧化进一步提高了滤后水中NOM各组分的可生化性. |
| 英文摘要 |
| Natural organic matter (NOM) in a filtered river water from a water treatment plant was isolated and fractionated into six types of fractions. The aim of the work is to investigate the formation of the low molecular weight (LMW) oxidation by-products (i.e. aldehydes, ketones and ketoacids) after ferric hydroxide-catalyzed ozonation of individual NOM fractions. Results showed that catalytic ozonation could improve the reduction of the dissolved organic matter (DOC) and specific UV absorbance (SUVA) at 254 nm compared with ozonation alone. However, catalytic ozonation with ferric hydroxide could not produce less LMW oxidation by-products than ozonation. Hydrophobic neutral (HON) produced much higher yields of the LMW oxidation by-products than other fractions both during catalytic ozonation and ozonation alone, while the basic NOM fractions formed relatively lower productions of these by-products. Like the case of ozonation alone, the predominant contributors for the yields of aldehydes and ketoacids formed in catalytic ozonation were formaldehyde and pyruvic acid, respectively. Among these NOM fractions, HON produced the highest yields of the formaldehyde and pyruvic acid after catalytic ozonation. The yield of formaldehyde from HON was up to 71.6% of the total aldehydes and ketones, and the pyruvic acid concentration of HON was 78.6 μg/mg after catalytic ozonation. In addition, NOM fractions became more biodegradable after catalytic ozonation, because the percent of total LMW by-products carbon in the final DOC after catalytic ozonation was higher than ozonation alone. |
