Migration and transformation of multiphase contaminant under hydraulic excitation by circulation well
Benzene,chlorobenzene,aniline and phenol with different soluble and volatile properties were taken as the target contaminant in a two-dimensional sandbox simulation experiment to analyze the concentration variations of dissolved phase,adsorbed phase and volatile phase during the operation of circulation well,and explore the migration and transformation rule of multiphase contaminants under the hydraulic excitation of circulation well.The results showed that the hydraulic excitation of the circulation well acted directly on the dissolved phase and the contaminant concentration decreased exponentially.After 96 h operation,the removal rates of dissolved benzene,chlorobenzene,aniline and phenol were 93.8％,89.9％,99.8％and 95.0％,respectively.The adsorbed phase and volatile phase contaminants are transferred and transformed into dissolved phase under the action of concentration gradient,and then removed by the hydraulic excitation of circulation well.The migration and transformation of adsorbed phase was related to the solubility of contaminants,and the adsorbed phase proportion of benzene,chlorobenzene,aniline and phenol decreased by 56.1％,71.2％,21.1％and 76.4％compared with the initial content,respectively.The migration and transformation of volatile phase was related to the volatility of contaminants and the removal rates of volatile chlorobenzene and benzene were only 16.1％and 15.7％.The comparison results showed that the hydraulic excitation of circulation well has the best removal effect on dissolved phase,followed by adsorbed phase,and the worst removal effect on volatile phase.This study can provide reference for site remediation design of circulation well.
circulation wellhydraulic excitationphase distributionmigration and transformationremoval rate
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