Prediction of groundwater environmental impact on a power plant under accident conditions

Abstract

According to the engineering features of the proposed power plant and the possible pollution accidents, the accident conditions of two kinds of polluted groundwater, such as the light diesel oil tank bottom leakage and the power plant pond bottom leakage are set up. Using the two-dimensional hydrodynamic dispersion equation of the continuous injection and instantaneous injection, the groundwater pollution in the accident condition is predicted and evaluated. The results show that, with the passage of time, the migration range of groundwater pollutants caused by sewage leakage from industrial wastewater buffer tank shows a trend of gradual expansion; however, the maximum value of pollutant concentration exceeding standard is gradually decreasing. After 10 years, the excessive pollutant migration distance has reached 390 m. If no remedial measures are taken in time, during the operation of the power plant, industrial wastewater pool sewage leakage will cause long-term pollution to the groundwater. Similarly, if the accident was diesel tank explosion, the range of diesel contamination to groundwater is also increasing over time, but the concentration of pollutants is gradually decreasing. About 25 years later, the pollutant concentration within 400 m downstream of pollution source has decreased to 0.04 mg/L, and the impact of diesel oil leakage on groundwater has largely disappeared.