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- Title
Remediation of Contaminated Soil with Compound Heavy Metals Using an Array-Electrode Electrokinetics Coupled with Permeable Reactive Barrier System with Different Electrolytes.
- Authors
Li, Mengwei; Zhou, Haidong; Li, Xin; Pang, Lidan; Zhao, Ziming; Liu, Zhiyong
- Abstract
Remediation of the real soil contaminated with compound heavy metals including copper (Cu), lead (Pb), and cadmium (Cd) was investigated using previously developed electrokinetics applying array electrodes (AEEK) coupled with a permeable reactive barrier (AEEK-PRB), focusing on the influence of electrolytes. Effects of mono-electrolytes, potassium chloride (KCl), citric acid (CA), ascorbic acid, and ethylenediaminetetraacetic acid (EDTA), and their different composites on the AEEK-PRB remediation of the compound heavy metals contaminated soil was explored and compared using fly ash as the PRB material, and a voltage gradient of 2 V/cm. EDTA was the most effective mono-electrolyte with the removal of Cu, Pb and Cd up to 31.52, 46.74, and 40.56%, respectively, at 0.1 mol/L. Among the composite electrolytes, the combination of 0.1 mol/L CA and 0.01 mol/L EDTA could achieve the best removal of Cu, Pb and Cd reaching 43.40, 72.66 and 43.85%, respectively. During the remediation, exchangeable fraction (F1) and carbonate fraction (F2) of Cu was decreased in the sampling points with higher removal, and F1 of Pb and Cd decreased while their residual fraction (F5) increased. The non-uniform electric field of AEEK-PRB indicated the data of the removal represented their lower limits, and the results obtained were robust. EDTA 0.1 mol/L as mono-electrolyte and the composite electrolyte of 0.1 mol/L CA and 0.01 mol/L EDTA were preferable to be highly promising for the AEEK-PRB remediation of real soil contaminated with the compound heavy metals.
- Subjects
PERMEABLE reactive barriers; SOIL remediation; HEAVY metals; METAL compounds; ELECTROKINETICS; SOILS
- Publication
Eurasian Soil Science, 2022, Vol 55, Issue 12, p1939
- ISSN
1064-2293
- Publication type
Article
- DOI
10.1134/S1064229322601469