Successful remediation of organics and heavy metals compound pollution is challenging, and their removal using conventional techniques is often difficult. This study developed an enhanced electrokinetics technology to decontaminate a hydrocarbon–heavy metal co-contaminated soil by applying biostimulation and selective membranes (cationic and anionic). A 30-day experiment was conducted in the laboratory to remediate the soil co-contaminated with total petroleum hydrocarbon (TPH) (9075 mg/kg) and Ni (446.6 mg/kg). The results demonstrated that the addition of anion- and cation-exchange membranes maintained soil pH stability. BioEK remediation under pH control improved microbial growth, microbial degradation of petroleum and reduced biological toxicity. Microbial action immobilized metals (e.g., reduction in exchangeable Ni and the increase in residual Ni). The degradation rate of TPH in contaminated soil was linearly correlated with the increase in TPH degradation population (P < 0.05). Under the optimum operating conditions, electro-bioremediation achieved 77.4% TPH degradation and 58.5% Ni removal after 30 days. Thus, the application of EK with the use of anion- and cation-exchange membranes improved microbial growth and biodegradation, and indigenous bacteria could effectively reduce metal toxicity. The proposed technique can effectively remediate the soil contaminated by heavy metal and organic pollutants.

成功修复有机物和重金属化合物污染具有挑战性，并且使用常规技术将其清除通常很困难。这项研究开发了一种增强的电动技术，可通过应用生物刺激和选择性膜（阳离子和阴离子膜）对烃类重金属共同污染的土壤进行净化。在实验室进行了为期30天的实验，以修复被总石油烃（TPH）（9075 mg / kg）和镍（446.6 mg / kg）共同污染的土壤。结果表明，添加阴离子交换膜和阳离子交换膜可以保持土壤的pH稳定性。在pH控制下的BioEK修复改善了微生物的生长，石油的微生物降解并降低了生物毒性。固定微生物作用的金属（例如，交换镍的减少和残留镍的增加）。TPH在受污染土壤中的降解率与TPH降解种群的增加呈线性关系（P  <0.05）。在最佳操作条件下，电生物修复在30天后实现了77.4％的TPH降解和58.5％的镍去除率。因此，将EK与阴离子交换膜和阳离子交换膜一起使用可改善微生物的生长和生物降解，并且原生细菌可有效降低金属毒性。所提出的技术可以有效地修复被重金属和有机污染物污染的土壤。