基于2D-COS分析的难凝聚有机物臭氧化特性研究

Ozonation characteristics of low coagulability organics based on two dimensional correlation analysis

基于二维相关光谱分析,对污水厂二级出水难凝聚有机物的臭氧化特性进行了研究.结果表明,混凝很难去除污水厂二级出水中的溶解性有机物,污水厂二级出水溶解性有机物大部分属于难凝聚有机物,以腐殖酸类物质为主.臭氧氧化可以降低二级出水混凝后上清液的色度及UV_(254),去除率分别可达到70%和40%以上,但是对难凝聚有机物的去除率较低,去除率在10%以下,只是与难凝聚有机物进行了反应,改变其性质.同时,臭氧可以降低二级出水中难凝聚有机物的荧光强度,其中腐殖酸类物质的荧光强度降低较为明显.基于不同臭氧投加量下难凝聚有机物的同步荧光分析,可以得到二级出水难凝聚有机物的二维相关光谱,结果表明,腐殖酸类物质对臭氧氧化最为敏感,腐殖酸类物质与富里酸类物质相比会优先和臭氧反应.

Based on two dimensional correlation analysis, the characteristics of low coagulability organic matters fromWWTP effluent during ozonation were studied. The results showed that coagulation can hardly remove dissolved organicmatters in WWTP effluent, and most of dissolved organic matters in WWTP effluent belonged to low coagulabilityorganic matters, which mainly contained humic-like substances. Color and UV254 of coagulated supernatant can beremoved by ozonation with removal efficiency higher than 70% and 40% respectively. However, the removal efficiency oflow coagulability organic matters was low （lower than 10% removal efficiency） indicating the organic mattercharacteristics variation caused by ozonation. Furthermore, the fluorescence intensity could be reduced by ozonation, andthe fluorescence intensity of humic-like substances exhibited highest decrease. According to the results of synchronousfluorescence spectra at different ozone dosages, two dimensional correlation spectra can be obtained. The results indicatedthat humic-like substances were most sensitive fractions to ozonation in low coagulability organics from WWTP, andozone would preferentially react with humic-like substances rather than fulvic-like substances.