Study on Electro-Microbial Remediation of Oil-Contaminated Soil

A graphite electrode was inserted at both ends of the oil-contaminated soil, and a 24 V DC voltage was applied to reduce the potential of the soil between the electrodes to 1 V/cm. The effects of electrokinetic and microbial combined remediation on pH value, soil temperature, organic carbon content, available N, available P, available K and other indexes of petroleum-contaminated soil were studied. The results showed that the optimal degradation rate of the simulated contaminated soil with 2% petroleum concentration was 67.5% after electrokinetic and microbial combined treatment. The effective N, effective P and effective K increased by 1.5, 1.4 and 1.2 times, respectively. At the same time, the addition of electric remediation proved that the pH value and temperature of the soil could be kept in a relatively constant range, providing a stable environment for the life activities of microorganisms, and improving the oil degradation rate.