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摘要
In-situ bioremediation technology is one of the most important methods for volatile chlorinated hydrocarbons(VCHs)remediation in groundwater. Accurate simulation of the remediation process is critical for high-efficiency remediation. Nevertheless, most of the previous studies did not consider the natural attenuation of VCHs, which would lead to the inaccuracy in prediction. Therefore, this paper has proposed a Monod-Natural attenuation(M-Na)model of in-situ bioremediation considering the natural attenuation of VCHs to overcome the limitation of current VCHs in-situ bioremediation model. The source code of the M-Na model was coupled in RT3D in the form of user-defined reaction module. In this paper, hydrogen was provided by injecting lactic acid for in-situ bioremediation of tetrachloroethylene(PCE)contamination in aquifer to verify the accuracy of M-Na model and analyze the influence of controlling parameters(including lactic acid injection concentration and rate)of the remediation process. The simulation results have shown that the concentration of ethylene(ETH) increased about 10% due to the natural attenuation of VCHs, which could not be neglected. Meanwhile, the lactic acid optimal concentration is 30 mg·L-1 and the optimal injection rate is 200 m3·d-1 for the study area. This study is expected to provide accurate simulation model for in-situ bioremediation of groundwater contaminated by VCHs. ? 2022, Science Press. All right reserved.