污水厂二级出水溶解性有机物臭氧化特性研究

采用液相色谱荧光检测器将三维荧光图谱与凝胶色谱分子量分布相结合,对污水处理厂二级出水溶解性有机物(EfOM)的臭氧化反应特性进行了研究.结果表明臭氧会使得二级出水溶解性有机物三维荧光强度明显降低.HPLC-SEC的结果表明臭氧不会改变腐殖质类物质的分子量分布,但臭氧会与小分子蛋白类物质发生反应.根据制备液相的分析结果,小分子蛋白类物质中含有大量苯环及其他共轭结果物质,因此臭氧会优先与小分子蛋白类物质发生反应.同时,XPS分析结果表明臭氧在低投加量下就会与苯环结构反应,提高脂肪类饱和有机物含量,随着投加量进一步升高,含氧官能团(羰基,羧基)数量有所升高.

Ozonation characteristics of dissolved effluent organic matter from the secondary effluent of WWTP

HPLC-SEC coupled with a fluorescence detector was combined with an EEM spectra to study the ozonation characteristics of EfOM. The findings showed that ozonation did not change the molecular weight distribution of the humic-like substances. Furthermore, the HPLC-SEC results indicated that the molecular weight distribution of the humic-like substances was not changed by ozonation. Nonetheless, ozone reacted with the low molecular weight protein-like substances. According to preparative HPLC analysis, the low molecular weight protein-like substances contained large amounts of aromatic or other conjugated structures, which were preferentially ozonated. In addition, XPS analysis revealed that the aromatic structure was oxidized at a low ozone dosage, and the amount of aliphatic organic matter increased correspondingly. With the increasing of ozone dosage, the amount of oxygen-containing functional groups (carbonyl and carboxyl group) increased.