On Optimal Condition of Plant–Microbial Remediation of Petroleum Hydrocarbon Polluted Soil

At present, plant–microbial remediation of soil petroleum pollution has been widely used, but the study of using models to predict remediation effect and find optimal remediation conditions is still very lacking. In this paper, on the basis of the numerical model of previous research, the effects of Suaeda salsa–microbial remediation technique on soil petroleum hydrocarbon pollution were simulated under different soil initial pollutant concentration, soil moisture content and tillage depth. The spatial and temporal degradation of petroleum hydrocarbons and the corresponding degradation rate were studied. The results showed that under different remediation conditions, the degradation rate of microbes, plant and plant–microbial of petroleum hydrocarbon is in the range of 12.70%–24.70%, 4.14%–54.58% and 29.32%–67.28% in 180 days, respectively. It was found that the degradation rate of petroleum hydrocarbons was significantly affected by soil initial pollutant concentration, soil moisture content and tillage depth. The optimal application conditions of S. salsa–microbial remediation technology were found for the remediation of soil petroleum hydrocarbon pollution.