电动修复湖泊底泥铬污染的可行性试验

摘要

Sediment pollution is quite a serious problem in the whole world . This paper presents the test feasibility of electrokinetic (EK ) remediation of chromium-polluted sediment from Wuhan East Lake ,and the test device was designed .In the EK remediation process ,pH value change of sediment was maintained at a pH range between the cathode electrolyte and the anode electrolyte ;the value of electric current in the EK process first increased ,then decreased ,and finally remained stable .When EK experiment was operated for 48 hours at 20V direct current power ,the removal rates of Cr (Ⅲ) and Cr(Ⅵ) were 57 .8% and 17 .8% ,respectively .The results show that the chromium in lake sediment could be effectively removed by EK remediation method .%设计了电动修复东湖底泥铬污染的可行性试验装置。在电动修复过程中，底泥的pH值变化维持在阴极液和阳极液的p H值之间；电流首先增加，然后下降，最终维持稳定。试验表明，施加直流电压20 V、电动修复48 h ，六价铬和三价铬去除率分别达到57．3％和18．4％，说明电动技术可用于修复湖泊底泥的铬污染。