水力停留时间对溶解性有机物特性的影响

Influence of Hydraulic Retention Time on Characteristics of Dissolved Organic Matter

摘要:

借助凝胶过滤色谱(GFC)和三维荧光光谱,研究膜生物反应器处理餐饮废水中水力停留时间thr对溶解性有机物特性的影响.研究表明,随着thr的减少,膜出水GFC图谱中的第二个峰值不断向小分子量方向迁移,且分子量分布范围逐渐变宽;thr对污泥胞外聚合物的分子量分布影响较小;进水中主要荧光物质是高、低激发波长类色氨酸,出水中主要荧光物质是紫外区和可见区类富里酸,且随着thr的减少,4号和5号装置的膜出水中出现高激发波长类色氨酸,同时峰值的发射波长较进水分别红移5 nm和10 nm.

Abstract:

The influence of hydraulic retention time (thr) on characteristics of dissolved organic matter (DOM) in membrane bioreactor used for restaurant wastewater treatment was studied through gel filtration chromatography (GFC) and excitationemission matrix fluorescence spectra analysis.Results show that the second peaks in GFC spectra of the effluent samples gradually move to the direction of the smaller molecular weight distribution.The molecular weight distribution becomes broader with the decreasing of thr.Meanwhile,molecular weight distribution of extracellular polymeric substances (EPS) in sludges is less affected by thr.The main fluorescent materials in raw water are high and lowexcitation wavelength tryptophan.However,the primary fluorescent substances in effluents are UV and visible fulviclike.With the decrease of thr,highexcitation wavelength tryptophan occurs in effluents of No.4,5 experimental devices.It is also found that the center of this tryptophan peaks are redshifted by 5 nm and 10 nm along the emission axis compared with the influent wastewater,respectively.