Solubilization and desorption effect for tetrachloroethylene of in-suit microemulsion containing Brij35
ZHANG Jing-yi1,2,3, FU Yu-feng1,2,3, YAO YU1,2,3, YUAN Fang1,2,3, QIN Chuan-yu1,2,3
1. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China; 2. College of New Energy and Environment, Jilin University, Changchun 130021, China; 3. National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology, Changchun 130021, China
Abstract:A microemulsion was in-situ formed in the aquifer by using binary solutions of non-ionic surfactant Brij35 and cosolvant butanol, and tetrachloroethylene (PCE). The solubilization and desorption ability of the microemulsion toward PCE as well as the formation process and the PCE repair effect in the simulated aquifer were investigated. The results showed that the maximum solubility of microemulsions for PCE was 61.1g/L, which was 9.7 and 2.3 times higher than that of a single Brij35 solution and its conventional mixture. In addition, the solubility of PCE was positively correlated with the volume fraction of n-butanol. The results of desorption experiments showed that in-situ formed microemulsion could play a good role in desorption of pollutants in different types of media. The desorption rate was 3 times higher than that of a single surfactant. Meanwhile, the higher the volume fraction of n-butanol, the larger the particle size of the medium and the lower the viscosity of microemulsion, the higher the efficiency of pollutants desorption. And the optimum desorption capacity was achieved with 250g/L Brij and 35%~30% n-butanol. The simulated flushing experimental results confirmed the in-situ formation of microemulsion in the aquifer. During the early stage, the solubilization was mainly caused by the microemulsion, and in later stages, the solubilization was mainly by the surfactant. After flushing, 94% of the PCE was removed, and the tailing phenomenon in the later stage of washing was effectively reduced.
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