Study on the Effect of Sulfate on the Degradation of BTEX in Leakage Area of Gasoline by Using Numerical Simulation

In order to explore the migration of sulfate electron acceptors injected into aqueous media, and study the specific attenuation of BTEX with sulfate injecting. In this study, the laboratory sand tank was used for the injecting and natural attenuation monitoring experiments. The combination of MODFLOW and RT3D was used to simulate the attenuation process of sulfate and natural degradation of BTEX. The results showed that the concentration of sulfate in the source area was significantly lower than that of the surrounding area at the 600th day after injected on the 416th day and BTEX concentration also gradually tends to zero. The injection experiments were conducted for a total of 46 days with the injected sulfate quality of 1488.24 g, and the calculated sulfate output of 1320.52 g. It can be seen that the input was significantly higher than the output and the sulfate loss could be judged as acting on Redox reactions .Sulfate promoted the degradation of BTEX. The numerical simulation was carried out for the water flow model and water quality model calibration, the normalized RMS of water flow model and water quality model are 9.8% and 8% respectively, which are less than 10% of the conventional limit. The model can accurately simulate the migration of sulfate and BTEX attenuation and predict the further pollution of BTEX. And can be applied to the actual site contaminated by BTEX that has important practical significance.