Remediation of Pb/Cr co-contaminated soil using electrokinetic process and approaching electrode technique

Environmental Science and Pollution Research International
Yee-Sern NgMohd Ali Hashim

Abstract

Electrokinetic process has emerged as an important tool for remediating heavy metal-contaminated soil. The process can concentrate heavy metals into smaller soil volume even in the absence of hydraulic flow. This makes it an attractive soil pre-treatment method before other remediation techniques are applied such that the chemical consumption in the latter stage can be reduced. The present study evaluates the feasibility of electrokinetic process in concentrating lead (Pb) and chromium (Cr) in a co-contaminated soil using different types of wetting agents, namely 0.01 M NaNO3, 0.1 M citric acid and 0.1 M EDTA. The data obtained showed that NaNO3 and citric acid resulted in poor Pb electromigration in this study. As for Cr migration, these agents were also found to give lower electromigration rate especially at low pH region as a result of Cr(VI) adsorption and possible reduction into Cr(III). In contrast, EDTA emerged as the best wetting agent in this study as it formed water-soluble anionic complexes with both Pb and Cr. This provided effective one-way electromigration towards the anode for both ions, and they were accumulated into smaller soil volume with an enrichment ratio of 1.55-1.82. A further study on the application of...Continue Reading

References

Apr 23, 1993·Science·R F Probstein, R E Hicks
Jun 24, 2008·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Giorgia De GioannisRaffaella Pomi
May 27, 2009·Journal of Hazardous Materials·Sung-Woo ParkKitae Baek
Jul 26, 2011·Journal of Hazardous Materials·Xinhua CaoYeqing Lan
Sep 6, 2011·Journal of Hazardous Materials·Albert T Yeung, Ying-Ying Gu
May 23, 2012·Journal of Hazardous Materials·Carlos E Barrera-DíazBryan Bilyeu
Nov 10, 2013·Environmental Science and Pollution Research International·Tao ZhangTang Tang

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cell Migration

Cell migration is involved in a variety of physiological and pathological processes such as embryonic development, cancer metastasis, blood vessel formation and remoulding, tissue regeneration, immune surveillance and inflammation. Here is the latest research.