城市污水二级出水溶解性有机物(DOM)与Cu^(2+)作用的聚集和光谱特性  

Aggregation and spectral characteristics of DOM from secondary effluent of municipal wastewater in reaction with Cu^(2+)

作　　者：杨毅[1] 马新培 杨霞霞[1] 徐会宁[2] 李志强[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西安建筑科技大学陕西省环境工程重点实验室,西安710055

出　　处：《环境化学》2017年第12期2609-2615,共7页Environmental Chemistry

基　　金：国家自然科学基金(21407119);陕西省教育厅专项科研计划(15JK1440)资助~~

摘　　要：利用三维荧光光谱法、紫外分光光度法和动态光散射技术,研究城市污水二级出水中溶解性有机物(DOM)与Cu^(2+)作用的粒径变化、光谱特性和络合能力.结果表明,利用修正型Stern-Volmer方程得到二级出水DOM与Cu^(2+)作用的条件稳定常数(lg K)和配位荧光官能团比例分别为1.74—2.59和8.77%—39.44%.在一定实验范围内,随投加Cu^(2+)浓度和pH增大,二级出水DOM和Cu^(2+)作用后的UV253/UV203值增大.pH值为7—9时,随pH增大,荧光强度基本增强而荧光指数降低;相同pH下,随投加Cu^(2+)浓度增加,荧光强度降低而荧光指数增大.表明二级出水DOM络合Cu^(2+),改变两者在水中的存在状态和迁移.pH 7时,DOM与Cu^(2+)有较高的络合稳定性和络合能力.A laboratory study was conducted to investigate the aggregation,spectral properties and complexing ability of dissolved organic matter（DOM） in secondary effluent of municipal sewage with Cu^（2＋） by using three-dimensional fluorescence spectroscopy,UV spectrophotometry and dynamic light scattering technique.Using the modified Stern-Volmer equation the conditional stability constant（lg K） and the proportion of fluorescent functional groups of the DOM binding with Cu^（2＋） were calculated to be 1.74—2.59 and 8.77%—39.44% respectively.The UV253/UV203 values increased with the increases of the Cu^（2＋） concentrations and pH in a certain range.The fluorescence intensity was substantially strengthened and the fluorescence index（FI） reduced with increasing pH at pH 7—9.However,the fluorescence intensity decreased and the FI increased with increasing the Cu^（2＋） concentration at the same pH.It could be concluded that the secondary effluent DOM complexed withCu^（2＋） changing their state and migration in water.DOM had higher complexing stability and binding ability with Cu^（2＋） at pH 7.

关 键 词：二级出水 溶解性有机物 CU2+ 粒径 光谱特性 

分 类 号：X703[环境科学与工程—环境工程]