EGSB+A/O工艺处理玉米深加工废水出水中DOM特性分析

DOM Characteristic Analysis of Corn Deep-processing Wastewater by EGSB + A/O Process

采用超滤膜法对某玉米深加工污水站EGSB+AO工艺二沉池出水进行分级,结合总溶解性有机碳(DOC)浓度、UV254和三维荧光光谱分析出水中溶解性有机物分子质量分布特性。结果表明,玉米深加工废水二级出水中溶解性有机物以分子质量大于10 k和小于0.5 k物质为主,这2个区间组分的芳香度较高。三维荧光谱图分析表明,出水主要含有色氨酸类蛋白和腐殖质,各分子质量区间的腐殖质荧光强度大于同分子质量的蛋白质类物质,而腐殖质是在好氧曝气阶段生成。各分子质量区间有机物的总荧光强度和DOC浓度、UV254呈显著线性相关。

The secondary sedimentation tank effluent of a corn deep-processing wastewater treatment plant （WWTP） by EGSB ＋ A/O process was classified by ultrafiltration membrane separation. The molecular weight distribution characteristics of effluent dissolved organic matter were investigated by measuring DOC, UV254 and three-dimensional fluorescence spectrum. The results showed that the dissolved organic matter （DOM） of corn deep-processing WWTP secondary effluent was mainly substances with molecular weight greater than 10 k and less than 0. 5 k, the aromatic structure was rich in these two molecular weight components. Three-dimensional fluorescence spectroscopy showed that the effluent mainly contained tryptophan protein-like and humus substances, the fluorescence intensity of humus of each molecular weight range was greater than that of proteins, and humus was generated in aerobic aeration stage. The total fluorescence intensity of organic matter of each molecular weight range showed a significant linear correlation with DOC and UV254.