Method for predicting and evaluating rebound potential of repaired groundwater in heterogeneity polluted site

Abstract

The invention discloses a method for predicting and evaluating rebound potential of groundwater in a heterogeneity polluted site after remediation. Comprising the steps of constructing a component model, identifying a potential pollution rebounding area, investigating the pollution of the potential pollution rebounding area, screening the rebounding area, calculating the residual mass of pollutants in a low-permeability soil layer of the rebounding area, calculating the residual mass of target pollutants in an underground water-bearing layer of the rebounding area, and predicting and evaluating the regional rebounding potential. According to the method, a prediction model of the concentration of the target pollutants in the underground water in the rebound area aquifer under the static balance scene is created based on the mass conservation principle of the target pollutants in the rebound area aquifer and the low-permeability stratum in the adjacent area; the model is an analytical model, the solution is simpler than that of a traditional numerical model, parameters can be obtained through field actual measurement, the model is easy to popularize and apply, and the uncertainty of a model prediction result is low.

Description

technical field [0001] The invention relates to the technical field of site pollution investigation and risk assessment, and in particular relates to a method for predicting and evaluating the rebound potential of groundwater after restoration of heterogeneously polluted site. Background technique [0002] According to the requirements of the Soil Law, if the pollution risk determined by the pollution status investigation and risk assessment exceeds the acceptable level, risk control or remediation should be carried out. At the same time, the Soil Law also clearly requires that the person responsible for soil pollution or the owner of the land use right should hire a third-party agency to evaluate the effect of site risk control or restoration to ensure that the control or restoration goals identified in the risk assessment report are met. To this end, the Ministry of Ecology and Environment has formulated and implemented the Technical Guidelines for Risk Management and Cont...

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Problems solved by technology

[0005] The invention provides a method for predicting and evaluating rebound potential of groundwater in heterogeneous polluted sites after remediation, which solves multiple problems such as site hydrogeological conditions, concentration and quality of residual pollutants, and migration and transformation rules of target pollutants in low-permeability formations and aquifers. Under the influence of factor coupling, only relying on continuous monitoring of groundwater for two years to judge whether there is a rebound in the rise of target pollutants leads to technical problems of false negative conclusions

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