Abstract:

It is scientifically significant to establish soil remediation standards for the synergistic management of soil and groundwater. Previous studies often assumed that contaminant sources directly affect the saturated zone, with little consideration for the lag, attenuation, and variations in pollutant sources during migration in the vadose zone. Addressing this issue, in this paper coupling the one-dimensional vertical transport analytical solution of pollutants in soil with the three-dimensional transport analytical solution of pollutants in groundwater, the influence of factors affecting pollutant migration and transformation on the synergistic remediation threshold of soil and groundwater is investigated. The results indicate that without considering the synergistic remediation of soil and groundwater, based on the screening values of soil for the first category of land use in current standards, benzene and chlorobenzene should be remediated to 1 mg/kg and 68 mg/kg respectively. Considering the synergistic remediation of soil and groundwater and aiming for compliance with downstream groundwater quality standards, the calculated synergistic remediation thresholds for soil and groundwater are 0.150 mg/kg and 150.000 mg/kg respectively. Failure to consider the synergistic remediation of soil and groundwater may result in inadequate or excessive soil remediation at the site.

Key words: contaminated site')">contaminated site, and groundwater synergistic remediation')"> soil and groundwater synergistic remediation, calculation')"> threshold calculation,  , solution')"> analytic solution, simulation')"> coupled simulation