Electrokinetic Restoration of Saline Soil Accumulated with Nitrate and Sulfate

Abstract

The electrokinetic transport characteristics of salts were investigated using nitrate and sulfate accumulated saline greenhouse soil. Within 8 days, 95% of nitrate was removed from the soil, while sulfate removal was 19% for 8 days. The low removal of sulfate came from adsorption reaction on the soil particles or organic matter and precipitation with calcium. Divalent cations such as calcium and magnesium were transported toward cathode via electromigration, and most monovalent cation such as potassium was removed. The pattern of residual electrical conductivity was similar with that of sulfate. Based on the results, electrokinetic technique is effective to restore nitrate-accumulated saline soil, but is not effective to restore sulfate-accumulated soil.

Evaluation of Electrolyte and Electrode Spacing for Application of Electrokinetic Remediation

“…정화기술이 적용되고 있으나 아직까지는 현장적용보다 실 험실 수준의 연구가 많은 실정이다 (Acar and Alshawabkeh, 1996;Cho et al, 2009;Cho et al, 2011;Kim et al, 2011a). 현재, 전기동력학적 정화에서 양극조와 음극 조에 전해질이나 추출액을 첨가하여 오염물의 제거효율을 높이는 방법 Kim et al, 2011a;Ryu et al, 2011), 펄스를 이용하여 오염물의 제거율을 높이고 전력소모량을 감소시키는 방법 Ryu et al, 2010), 생물학적 방법과 전기동력학적 방법을 결합한 하이브리드 공법 (Alshawabkeh et al, 1999 Table 3).…”