Study of the matrix effects of two types of soils (kaolin and montmorillonite) on the electrokinetic remediation

CHED 106

Xiaocheng Lu, bisp@nju.edu.cn, Xingfa Huang, Jiongjia Cheng, Zheng Zheng, and Shuping Bi, bisp@nju.edu.cn. Department of Chemistry,State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Hankou Road 22, Nanjing, 210093, China
Electrokinetic remediation (EK) shows distinct advantages for heavy metals contaminated soils. In order to study the influence of different soil matrix on the electrolytic process and the potential grade effects in the process of electrokinetic remediation for contaminated soils, two types of soil, montmorillonite and kaoline are studied experimentally with our home-made instrumentation. The changes of soil potential, direct current, and pH etc are investigated systematically. It is found that different soils show different behaviors of dissolution and precipitation, which greatly alter the potential grade crossing the whole soil areas. This will influence the electro-osmosis as well as electro-migration, and finally affect the efficiencies of electrokinetic remediation for contaminated soils. The electrokinetic remediation results for Cu(II) contaminated soil indicates that EK technique is effective for kaoline, but not suitable for montmorillonite.--- This work is supported by JSFC of BK2005083.
 

General Posters
7:30 PM-9:30 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Chemical Education

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007