【作者】 周志伟； 杨艳玲； 李星； 刘永旺； 苏兆阳；

【Author】 Zhou Zhiwei;Yang Yanling;Li Xing;Liu Yongwang;Su Zhaoyang;Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing University of Technology;

【机构】 北京工业大学北京市水质科学与水环境恢复工程重点实验室；

【摘要】 选定两种水样（模拟水样W1和龙潭湖水W2）以及相应滤池反冲洗水（FBWW1和FBWW2）,对比考察回流体积比为0%（空白）、2%、5%和8%FBWW直接与相应原水混合后,混凝-沉淀出水中DOC、UV₂₅₄和比紫外吸光度（SUVA）去除效果及溶解性有机物（DOM）荧光特性。结果表明:FBWW与相应原水中DOM荧光光谱中均出现A峰Ex/Em=245.0²65.0 nm/400.0⁴35.0 nm,T峰Ex/Em=280.0³05.0 nm/305.0³45.0 nm,分别代表类腐殖质和类蛋白物质,此外有一个荧光强度较弱的C峰带。FBWW1回流均可强化W1中DOM去除,FBWW2回流强化去除DOM效果不明显。出水中DOM与对应原水中DOM三维荧光光谱图较为相似。FBWW回流工艺可强化类腐殖质（A峰）去除,而类蛋白物质（T峰）没有去除甚至有所富集。三维荧光技术可有效地表征FBWW回流混凝工艺中DOM去除情况,将具有广阔应用前景。更多还原

【Abstract】 The impacts of recycling filter backwash water（FBWW） blended with corresponding raw water Wl（simulated water） and W2（Longtan lake water） on specific bulk water parameters,i.e.DOC,UV₂₅₄ and specific ultraviolet absorbance（SUVA） removal were evaluated in coagulation-sedimentation processes.Fluorescence characteristics of dissolved organic matter（DOM） in source waters,FBWWs and treated water were identified and compared.As compared with control trial without FBWW,three volumetric recycling ratios at 2%,5%and 8%were investigated.The results indicated that fluorescent components in raw water and corresponding untreated FBWWs DOM were mainly humic-like fluorophore（Peak A） and protein-like fluorophore（Peak T）,with Ex /Em wavelengths at 245.0²65.0 nm/400.0⁴35.0 run,280.0³05.0 nm/305.0³45.0 nm,respectively.Additionally,a broad Peak C with relatively lower fluorescence intensity was observed in all fluorescence spectra.At observed recycling rates,organic matter removal rates in treated water were improved with FBWW1,while the enhanced removal efficiencies of DOM in treated samples with FBWW2 were unconspicuous.Fluorescence EEM spectra in the DOM of treated water samples were analogous to those of source water accordingly.The process of recycling FBWW could improve humic-like substances（Peak A） removal,but the protein-like matters were resistant to elimination or even enriched with unvaried structure.The DOM removal in the coagulation process of recycling filter backwash water could be well identified by the three-dimensional excitation emission matrix（3D-EEM） fluorescence technique,therefore it could be used in wide applications.更多还原