Pilot-scale ex situ electrokinetic restoration of saline greenhouse soil

Abstract

Purpose This study was conducted to investigate the feasibility of using an ex situ electrokinetic system for the restoration of saline greenhouse soil. Materials and methods An experiment was conducted in a pilot-scale reactor (1×1×0.25 m) during 14 days. Results and discussion Chloride accumulated in the top layer through pore-water evaporation. There was no removal of the nitrate in the top layer because of the continuous upward transport of nitrate accompanying the evaporation of soil moisture. However, the removal of sulfate was uniform across all the layers. In the case of cations, a significant amount (64.4%) of potassium was removed, and there was no removal of the magnesium in the top layer. The electrokinetic treatment changed the speciation of calcium in the soil, resulting in an increase in the amount of exchangeable calcium. Furthermore, nitrate was transported toward the anode and reduced to nitrogen gas as the result of an electrochemical reaction at the surface of the anode. Sulfate formed a very stable and insoluble precipitate with calcium-calcium sulfate (gypsum). Conclusions Ex situ electrokinetic system removed salts from nitrate and sulfate-accumulated saline soil. However, the overall removal efficiency was not high enough because of relatively short operation time.

Reclaiming Saline-Sodic Soils Using Electrochemical Processes: A Case Study From Sahl El-Tina Plain, Egypt

“…The soil must have had high buffering capacity due to the heavy clayey texture and high CaCO 3 content (Table 1). Kim et al (2011) observed that the pH values ranged from 4.8 to 6.6 due to the high buffering capacity of the soil upon high organic content and considerable silt content.…”

Economic Analysis on Desalination Technology for Saline Agricultural Land on the Basis of Crop Production

“…이러한 염류집적 현상을 완화하기 위한 제염기술로는 객 토, 심토반전, 암거배수, 흡비작물(cleaning crop)재배, 전 기역학적 탈염 등의 다양한 방법이 있고 이와 관련된 많 은 연구가 시도되고 있는데 (Jia et al, 2005;Jo et al, 2012;Kim et al, 2011Kim et al, , 2012bKim et al, , 2012cOh et al, 2010;Ok et al, 2005;Qadir et al, 1998) …”

Electrokinetic Restoration of Saline Soil Accumulated with Nitrate and Sulfate

“…전기동력학적 정화기술은 이온성 오염물질을 토양 으로부터 제거하기 위해 고안된 방법이다 (박성우 외, 2008; 조정민 외, 2009; 박근용 외, 2010). 최근의 연구 결과에 의하면 전기동력학적 방법은 염류집적 토양에서 염류를 효과적으로 제거할 수 있다고 보고되었다 (Jia et al, 2005;Cho et al, 2009Cho et al, , 2010Cho et al, , 2011Ha et al, 2009;Kim et al, 2011;Lee et al, 2011). Cho et al(2009 (정병간 외, 1998).…”