分离式电解槽系统电动力学修复氟污染黏土

Electrokinetic remediation of fluorine-contaminated kaolin clay by separative electrolytic cell system

为解决氟污染土壤修复过程中不同形态的氟在电动力学作用下向土体中间迁移,导致修复后氟在电解槽中部累积所带来的去除率降低问题,采用自制的分离式电解槽系统,以去离子水作电解液,通过单因素实验,在0.5、1.0、1.5 V·cm^(-1)修复电压下,对电动力学修复氟污染黏土的效果进行了研究。结果表明:分离式电解槽系统可有效修复氟污染黏土,土壤氟的去除率随着修复电压的升高而增大,最高可达61.86%;修复后各部分土壤氟含量差异较小,土壤中剩余氟没有出现累积现象;能量消耗随着修复电压的升高快速增加,而能量效率不断减小。实际应用电动力学技术修复氟污染土壤时,在考虑土壤氟去除率的同时要兼顾能量效率,以保证修复方案在经济上可行。

In order to solve the problem of low removal rate of soil fluorine because of the accumulation of various forms of fluorine in the center of the electrolytic cell under the function of electrokinetics, a self-made separative electrolytic cell system was used and a single factor test was carried out to investigate the efficiency of the electrokinetic remediation for fluorine-contaminated soil by using deionized water as electrolyte and the voltage gradient was set at 0.5, 1.0 and 1.5 V·cm^-1, respectively. The results showed that the separative electrolytic cell system can effectively remediate the fluorine-contaminated clay. The removal rate of fluorine increased with the voltage gradient and the maximum rate reached 61.86%. The difference of fluorine content between each soil section reduced after remediation, and the residual fluorine in soil did not appear cumulative phenomenon. The energy consumption increased rapidly with the voltage gradient, while the energy efficiency reduced constantly. In the practical application of electrokinetic remediation for fluorine-contaminated soil, both the removal rate of fluorine and energy efficiency should be taken into account so as to ensure that the remediation program is economically viable.