An Enhanced Electrokinetic/Waste Fe(OH) 3 Permeable Reactive Barrier System for Soil Remediation in Sulfide Mine Areas

Yifeng Fan, Lingyun Tu, Changjun Liao, Qiujun Li and Dengjun Lu ()
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Yifeng Fan: College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
Lingyun Tu: College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
Changjun Liao: Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning 530007, China
Qiujun Li: Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning 530007, China
Dengjun Lu: College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China

Sustainability, 2022, vol. 14, issue 22, 1-12

Abstract: Traditional electrokinetic (EK) technology can remove contaminants from soil, but the efficiency is generally low. This study reports on the combination of enhanced EK and a waste ferric hydroxide (Fe(OH) 3 ) permeable reactive barrier (PRB) for the remediation of soil in sulfide mine areas. Hydroxyethylene diphosphonic acid (HEDP) and FeCl 3 were used as a compound chelating agent. The experimental results showed that EK combined with PRB technology (95.32% Cd removal) was more effective than single EK in removing cadmium (Cd) from the contaminated soil, because of the compound chelating agent and PRB filled with sustainable Fe(OH) 3 adsorbent. Additionally, the application of PRB in combination with HEDP was able to increase the sulfate removal rate to 96.19%. The accumulated energy consumption of these two systems was 182.4 and 356 kWh/m 3 , respectively, after EK remediation using PRB.

Keywords: electrokinetic remediation; ferric hydroxide; permeable reactive barrier; soil; sulfide mine areas (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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