An electrokinetic/Fe0 permeable reactive barrier system for the treatment of nitrate-contaminated subsurface soils.

摘要: Abstract Effective nitrate removal by Fe0 permeable reactive barriers (Fe0 PRB) has been recognized as a challenging task because the iron corrosion product foamed on hinders effective electron transfer from to surface-bound nitrate. The objectives of this study were (i) demonstrate effectiveness an electrokinetic/Fe0 PRB system for remediating nitrate-contaminated low permeability soils using bench-scale and (ii) deepen understanding behavior fate in system. Bench-scale laboratory experiments designed investigate influence content barrier, pH anode well, applied voltage remediation efficiency. experimental results showed that major reaction reduction was ammonium efficiency significantly influenced variables investigated study. Nitrate enhanced either increasing barrier or decreasing initial pH. However, reduced 10 V 40 V due insufficient time during migration through PRB. For all conditions, nearly nitrogen recovered cathode wells within 100 h, demonstrating subsurface soils.