餐饮废水MBR处理过程中DOM的三维荧光光谱分析

摘要

采用三维荧光(EEM)光谱技术,对膜-生物反应器(MBR)处理餐饮废水过程中的各种溶解性有机物(DOM)进行分析,并对比研究不同水质和容积负荷下DOM的EEM光谱的迁移变化特性和DOM中荧光物质对膜污染速率的影响.结果表明,各种DOM的荧光物质中,蛋白质类物质所占的比重最大,且溶解性微生物代谢产物(SMP)和附着型胞外聚合物(EPS)中的蛋白质类荧光物质对膜污染速率的影响最大,而紧密附着胞外聚合物(TB-EPS)中蛋白质类荧光物质强度与膜污染速率呈强烈的负相关性.腐殖酸溯源表明DOM中的腐殖酸以微生物代谢产生的带有荧光基团的腐殖酸类为主.%Through excitation-emission matrix (EEM) fluorescence spectra analysis, the characteristics of dissolved organic matter (DOM) in the process of membrane bioreactor used for restaurant wastewater treatment were studied.Meanwhile, the influence of raw water quality and volumetric loading on migration features of DOM and the impact of fluorescent substances on membrane fouling rate were studied.Protein substances had the largest percentage in various fluorescent substances of DOM and SPSS analysis also showed that protein-fluorescent substances in soluble microbial metabolic products (SMP) and bound extracellular polymeric substances (EPS) had the greatest impact on membrane fouling rate.However, the intensity of protein-fluorescent substances in tightly bound extracellular polymeric substances (TB-EPS) showed a strong negative correlation with membrane fouling rate.Humic acid produced by microbial metabolism with fluorescence-based groups was primary source of humic acid in DOM.