活化过硫酸钠原位修复浅层石油烃类污染土壤的模拟研究

以过硫酸钠为氧化剂,硫酸亚铁为活化剂,通过箱体实验,结合农业滴灌技术,原位化学氧化修复浅层石油烃(TPH)污染土壤,考察修复过程中土壤TPH、含水率、电导率、pH的变化情况。结果表明,硫酸亚铁活化过硫酸钠对土壤中TPH具有较好的去除作用,通过40d的原位修复处理,表层土和中层土中的TPH去除率分别达到44.6%、44.1%;修复过程中,表层土含水率、电导率呈先上升后下降的趋势,中层土含水率、电导率则先上升后波动变化,表层土、中层土pH均呈先下降后上升的趋势;土壤TPH与含水率、电导率、pH间均存在相互制约的关系。

A simulation research on in-situ remediation of shallow TPH-contaminated soil by activated sodium persulfate

The in-situ chemical oxidation remediation of petroleum hydrocarbon(TPH)-contaminated soil was performed with sodium persulfate as the oxidant and ferrous sulfate as the activator.Drip irrigation technology,which widely used in agriculture,was also applied in the remediation process.The changes of TPH,water content,conductivity and pH in soil during the remediation process was studied and their correlation were researched.Results showed that TPH-contaminated soil was effectively remediated by ferrous-activated sodium persulfate,the TPH removal rates were 44.6% and 44.1%in surface soil and middle layer soil after 40 days of remediation.During the remediation process,water content and conductivity in surface soil was increased at first and then decreased,while in soil of middle layer,water content and conductivity was increased at first and then fluctuated;the pH in soil of both surface and middle layer were all dropped first and then raised.There was an interaction between TPH content and soil pH,water content,conductivity.