American Society of Civil Engineers


Effect of the Composition of Anodic Purging Solutions on Electroosmosis


by Songhu Yuan, (Ph.D. Candidate, Envir. Sci. Res. Inst., Huazhong Univ. of Sci. and Technol., Wuhan 430074, P.R. China. E-mail: yuansonghu622@hotmail.com), Meng Tian, (Grad. Student, Envir. Sci. Res. Inst., Huazhong Univ. of Sci. and Technol., Wuhan 430074, P.R. China. E-mail: haonanrentianmeng@126.com), Taiping Li, (Ph.D. Candidate, Envir. Sci. Res. Inst., Huazhong Univ. of Sci and Technol., Wuhan 430074, P.R. China. E-mail: litai20000946@sina.com), and Xiaohua Lu, (corresponding author), (Prof., Envir. Sci. Res. Inst., Huazhong Univ. of Sci. and Technol., Wuhan 430074, P. R. China E-mail: lxh@hust-esri.com)

Journal of Environmental Engineering, Vol. 133, No. 6, June 2007, pp. 627-632, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9372(2007)133:6(627))

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Document type: Journal Paper
Abstract: The objective of this study is to investigate the effect of the composition of anodic purging solutions on electroosmosis in an electrokinetic (EK) system. The effect of buffering capacity of anodic purging solutions on electroosmosis was first studied. With the increase of buffering capacity, soil pH and electric current increased, but the maximal cumulative electroosmostic flow (EOF) was achieved with 0.010 mol/L Na2CO3/NaHCO3 buffer. Na2CO3/NaHCO3 containing NaCl and Na2SO4, respectively, were used as anodic purging solutions to investigate the effect of cation concentration and anion type on electroosmosis. The increase of cation concentration led to the increase of soil pH and electric current but the decrease of EOF. At the same cation concentration, Na2SO4 resulted in higher electric current and greater EOF than NaCl, but similar distribution of soil pH. The present study provides useful information for the selection of purging solution in the EK remediation of contaminated soils.


ASCE Subject Headings:
Soil treatment
Abatement and removal
Environmental engineering
Restoration