TY - JOUR ID - 37187 TI - Reducing Agents Enhanced Electrokinetic Soil Remediation (EKSR) for Heavy Metal Contaminated Soil JO - Iranian Journal of Chemistry and Chemical Engineering JA - IJCCE LA - en SN - 1021-9986 AU - G., Koteswara Reddy AU - Yarrakula, Kiran AU - Lakshmi U., Vijaya AD - Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram-522502, A.P, INDIA AD - School of Advanced Sciences (SAS), Department of Chemistry, VIT University, Vellore-632014, INDIA Y1 - 2019 PY - 2019 VL - 38 IS - 3 SP - 183 EP - 199 KW - heavy metals KW - Electrokinetic remediation KW - Reducing agents KW - Ascorbic acid DO - 10.30492/ijcce.2019.37187 N2 - Reducing agents-Enhanced electrokinetic Soil Remediation (EKSR) was performed for the removal of chromium (Cr), cobalt (Co) and nickel (Ni) from contaminated soil. The reducing agents oxalic acid and ascorbic acid were investigated under constant voltage gradient (2.0 V/cm), current changes, pH, redox potential, concentration changes and removal performance of Heavy Metals (HMs). The results indicated that the reducing agents were effective in the desorption of metals at the cathode with catholyte conditioning pH. The removal performance of heavy metals in reducing agents-enhanced EKSR was about 2-2.5 times more than in unenhanced treatment. The amount of HMs migrated to the catholyte was more than in the anolyte, which might be evidenced that the negatively charged metal-oxalate/ascorbate complexes migrated via electroosmosis. However, positively charged HM-oxalate/ascorbate complexes and free HM cations moved to the catholyte by electromigration action. Furthermore, the mass balance and cost analysis were performed for all EKSR experiments after 20 days of operation. The energy consumption per cubic meter of treated soil was 1104-18496 kWh/m3 and the total cost was about US$ 110.4-2095, including the cost of the enhancing agents. The study demonstrated that reducing agents-enhanced EKSR is cost-effective and efficient in the removal of HMs from contaminated soil. UR - https://ijcce.ac.ir/article_37187.html L1 - https://ijcce.ac.ir/article_37187_330d6ecc17d94795f15e678923a1cf02.pdf ER -