The performance of tetrachloroethylene solubilization in the aquifer by in-situ microemulsion of composite alcohols
In this study,a green nonionic surfactant,Lauryl glucoside(APG1214),was used to prepare an in-situ microemulsion of composite alcohols suitable for the remediation of tetrachloroethylene(PCE)contamination in groundwater.The effects of environmental factors on the phase behavior and solubilization of microemulsion were investigated.Besides,by simulating the aquifer,the performance of microemulsion in-situ leaching PCE was investigated.The results showed that 1.0wt.%APG1214-5.6 wt.%n-propanol/isobutanol(1:1)-0.8wt.%NaCl microemulsion had suitable alcohol width,and the solubility of PCE was about 550g/L.It showed good performance in reducing the adsorption of aquifer media,controlling vertical migration of pollutants,and preventing secondary pollution.The phase stability of the microemulsion was not significantly affected by environmental factors,but its solubilization was reduced in strong acid and low-temperature environments.Moreover,the in-situ leaching process removed PCE in the media by solubilization and mobilization,and the removal efficiency of PCE reached 99.4%after leaching.In all,the microemulsion has the advantages of strong solubilization ability,wide alcohol width,low surfactant dosage,wide environmental application range,and high removal efficiency of PCE after in-situ leaching,which makes it suitable for remediating PCE pollution in groundwater.
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