电动力学修复对沉积物理化性质的影响  

Examining Changes of Physico-chemical Characteristics of Contaminated Sediment after Electrokinetic Remediation

作　　者：李泰平[1] 袁松虎[1] 林莉[1] 万金忠[1] 徐懿[1] 陆晓华[1] 

机构地区：[1]华中科技大学环境科学研究所,湖北武汉430074

出　　处：《环境科学与技术》2010年第2期57-60,67,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目(20777024);华中科技大学自然科学基金项目

摘　　要：以某化工厂排污沟渠中受六氯苯污染沉积物为对象,选用非离子表面活性剂OP-10为强化助剂,研究了电动力学修复后沉积物理化性质如pH、有机质含量、氧化还原电位、含水率和电导率变化情况。结果表明,电动力学处理13.5d后靠近阳极区域沉积物被酸化,而阴极区域被碱化;表面活性剂在沉积物上的吸附导致靠近阳极处有机质含量明显增加,其有机质含量最大增幅达到46%以上,而靠近阴极区域的有机质随电渗析流迁移使得其含量低于初始值;氧化还原电位与pH分布呈相反趋势;沉积物中含水率从阳极向阴极增大,靠近阴极处又降低;沉积物中大部分区域电导率值小于初始值。This paper presents a bench-scale electrokinetic setup used for lab examining of contaminated sediment remediation with respect to changes of pH value, organic content, redox potential, moisture and electrical conductivity of the sediments. Sediment, sampled from a chemical plant＇s effluent ditch, polluted mainly by hexachlorobenzene, was added with the nonionic surfactant OP-10 as an enhanced reagent. After the electro-kinetic remediation, it was found that the sediment was acidified adjacent to the anode and basified adjacent tO the cathode. The organic content increased more than 46% close to the anode, compared with the initial level, due to adsorption of the surfactant onto the sedimentl but decreased close to the cathode due to the organic matter＇s migration with the electro-osmotic flow. Distribution of redox potential tended to a pattern in reverse of that of pH, moisture of the sediment tended to increase from the anode to cathode but declined near the cathode. In general, electrical conductivity of the sediment tended to decrease after the remediation of sediment.

关 键 词：沉积物性质 电动力学:修复 

分 类 号：X53[环境科学与工程—环境工程]