MIEX中试实验对二级出水中有机物去除的3DEEM解析

利用三维荧光光谱研究了磁性离子交换树脂（magnetic ion exchange resin,MIEX）对污水厂二级出水中有机物的去除特征.结果表明,磁性树脂处理二级出水过程中,两级反应过程和进水流量对DOC和UV254有较显著的去除效果,去除率分别达到25.5%～53.5%和27.6%～52.2%,其中50 L.h-1流量条件下,出水中DOC和UV254浓度分别为3.29 mg.L-1和0.057cm-1.水中芳香族蛋白质或酚类物质和类腐殖酸物质荧光强度较高,磁性树脂使二级出水中色氨酸类芳香族蛋白质、芳香族蛋白质、腐殖酸类荧光强度分别下降38.2%、85.8%和85.7%,腐殖酸和富里酸峰消失,并露出溶解性微生物代谢产物荧光峰.不同进水流量条件下,色氨酸类芳香族蛋白质荧光强度下降率和芳香族蛋白质或酚类物质荧光强度下降率与进水流量的负相关性最好,50～100 L.h-1流量条件对各类荧光物质的去除率影响最大.磁性树脂与二级出水中色氨酸类芳香族蛋白质和芳香族蛋白质或酚类物质有更好的线性置换关系（R2=0.834 8）,磁性树脂对二级出水中芳香族蛋白质或酚类物质的置换作用则最显著（a=850.2）.

Characterization of the Change in DOM During Municipal Secondary Effluent Treatment with Magnetic Ion Exchange Resin by 3DEEM

Magnetic ion exchange resin was a very good advanced treatment process to remove organic matter from municipal wastewater, and three-dimensional excitation emission matrix fluorescence spectroscopy was widely used to analyze the characterization of the change in DOM. The results showed that both two-stage treatment process and the rate variation of inflow affected the removal effects of DOC and UV₂₅₄ obviously, and the removal rates were 25.5%-53.5% and 27.6%-52.2%. The concentrations of DOC and UV₂₅₄ were 3.29 mg·L^-1 and 0.057 cm^-1 in T2 effluent respectively. The fluorescence intensities of aromatic protein and visible fulvic-like were high in municipal secondary effluent. MIEX made the fluorescence intensities of tryptophan protein, aromatic protein and humic-like fluorescence peaks decreasing 38.2%, 85.8% and 85.7% respectively from secondary effluent, and make humic-like and visible fulvic-like fluorescence peaks disappearing. The fluorescence peak of soluble microbial byproducts appeared. The negative correlations were strong between the declining rates of tryptophan-like fluorescence intensity and aromatic protein fluorescence intensity and the rates of inflow. 50-100 L·h^-1 flow rate influenced most for the removal rate of each DOC. The linear treatment effect was higher for tryptohan-like and aromatic protein DOM by MIEX(R²=0.8348), and the treatment effect was the highest for aromatic protein DOM by MIEX(a=850.2). The correlation between UV fulvic-like DOM and fluorescence intensity was worse than that between DOC and fluorescence intensity.