[关键词]
[摘要]
要: 以镉( Cd) 含量为 2 mg/ kg 污染底泥为研究对象, 使用电动修复技术对污染底泥中的 Cd 进行脱除。研究了不 同电极板间电压、化学增强剂种类以及电极材料对体系电流、温度、电导率、底泥含水率以及重金属含量的变化, 试 验结果表明: 使用阳离子聚丙烯酰胺( CPAM) 作为化学增强剂, 使用多孔碳作为电极, 极板间电压 30 V, 同时在 01 05 M Pa 的压力下进行抽滤, 底泥含水率在 5 h 内由 75% 下降到 341 17% , 重金属镉含量由 2 mg/ kg 下降到 01 178 mg / kg , 脱除率达到 911 12% , 修复后的底泥中镉的含量满足5土壤环境质量标准6 ( GB 15618- 1995) 中对镉含量的 一级标准要求, 达到了对污染底泥脱水过程中脱除重金属的目的。
[Key word]
[Abstract]
Taking co ntaminated sediment w ith a cadmium ( Cd) content of 2 mg / kg as the r esear ch object, we used electro kinetic remediation techno lo gy to r emo ve the Cd in the contaminated sediment. w e investig ated the inf luences of differ ent voltages be2 tw een elect rodes, ty pes of chemical enhancers, and electr ode mat erials on the curr ent, temperature, conductiv ity, sediment mo is2 tur e co ntent, and heav y metal co ntent. The ex perimental results show ed that: w ith catio nic polyacry lamide ( CPAM) as chemical enhancer, por ous car bo n as electr ode, electro de vo ltag e o f 30 V, and suctio n filtr ation at pr essure of 01 05 MPa, the sediment moisture content w as decreased fr om 75% to 341 17% in 5 ho urs, heavy metal cadmium content was decreased fr om 2 mg/ kg to 01 178 mg/ kg w ith a remo val rate of 911 12% , and t he content of cadmium in the r emediated sediment met t he first2lev el stand2 ar d fo r cadmium in GB 15618- 1995 So il Envir onment al Quality Standar d. It co uld r ea lize the pur po se of remo ving heavy metals during the dew atering pr ocess o f the co ntam inated sediment.
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[基金项目]
中交天津港航勘察设计研究院有限公司基金支持( 1500030023 ) ; 中交天航环保工程有限公司基金支持 ( 1700030003; 1700030031) ; 天津市大学生创新创业项目( 201710057053)