Electrokinetic control of nitrate movement in soil

Jia, Xinhua; Larson, D. L.; Slack, D. C.; Walworth, James

doi:10.1016/j.enggeo.2004.07.018

Cited by 38 publications

(19 citation statements)

References 10 publications

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“…Furthermore, they found that nitrate migration and accumulation was greater when the electric intensity was greater, the initial nitrate concentration was lower, and the electricity had been applied for a longer duration. The effects of nitrate movement by electromigration under a hydraulic gradient were reported by Jia et al [13,27]. In these laboratory-scale studies, vertical soil columns with the anode located at the top were used and nitrate solution was injected at the anode.…”

Section: Introductionmentioning

confidence: 99%

“…Budhu et al [25], Eid et al [7], and Jia et al [27] evaluated nitrate movement using a lab-scale EK system and confirmed nitrate movement toward the anode by electromigration. Furthermore, they found that nitrate migration and accumulation was greater when the electric intensity was greater, the initial nitrate concentration was lower, and the electricity had been applied for a longer duration.…”

Section: Introductionmentioning

confidence: 99%

“…Salts, which have high water solubility and exist as charged ions, are transported and removed by electromigration (movement of charged ions), electro-osmosis (liquid flow from anode to cathode through the pore spaces between particles), and electrophoresis (transfer of charged particles) from the soil surface [20,24]. Recently, several studies on desalination using EK remediation have been reported [7,[12][13][14][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Electrokinetic restoration of saline agricultural lands

2010

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Salinization of greenhouse soils has become a serious problem in Korea because of the extensive use of chemical fertilizers to improve crop yield. This study investigated the feasibility of electrokinetic (EK) treatment for reclamation of saline soil. Experiments were conducted using voltage gradients of 1, 2, and 3 V/cm applied for 48 and 96 h. Anions such as chloride, sulfate, and nitrate were transported toward the anode and accumulated there, whereas cations were transferred toward the cathode by electromigration. Among the various ions, the highest removal efficiency was achieved for nitrate: [80% at 48 h and [99% at 96 h. Chloride removal after 96 h was substantially higher than that after 48 h because the longer period of time allowed more electrical transport via electromigration and electro-osmosis. However, the removal efficiency for sulfate and calcium did not change significantly between 48 and 96 h. Soil EC was lower than the initial value in all soil sections at 96 h. The lowest value, 1.8 dS/m, was seen in the experiment employing a gradient of 3 V/cm for 48 h. This study demonstrated that nitrate can be readily removed from soil by electromigration. Further, other ions can also be removed by EK treatment; therefore, it could be successfully used for reclamation of saline soils.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrokinetic restoration of saline agricultural lands

2010

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“…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) …”

Section: 서 론unclassified

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

Kim¹,

Choi²,

Kim³

et al. 2012

Journal of Soil and Groundwater Environment

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In this study, economic analysis of five desalination technologies for saline agricultural land was carried out. The analysis was comprehensively evaluated by calculating changes in crop production and benefit/cost (B/C) ratio. The analysis of crop production was in the order of tomato > cucumber > a (musk) melon > watermelon > cabbage, and economical efficiency for desalination technology was in the order of soil exchange > soil addition > electrokinetics > under-drainage > subsoil reversal. In cost benefit analysis, B/C ratio was in the order of under-drainage > soil exchange > electrokinetics > soil addition > subsoil reversal, and all desalination technologies used in this study have the ratio higher than 1, which means economical efficiency was high. Based on the net production considering B/C ratio, the general economic analysis was exactly order from that of crop production analysis. As a result, economical efficiency of soil exchange was highest, and economical efficiency of soil addition and electrokinetic was relatively higher than others.

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“…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).…”

Section: 염류집적 농경지의 경우 직접적인 정화기술을 적용하기unclassified

Electrokinetic Restoration of Saline Soil Accumulated with Nitrate and Sulfate

Cho¹,

Jo²,

Kim³

et al. 2011

Journal of Soil and Groundwater Environment

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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.

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Electrokinetic control of nitrate movement in soil

Cited by 38 publications

References 10 publications

Electrokinetic restoration of saline agricultural lands

Electrokinetic restoration of saline agricultural lands

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

Electrokinetic Restoration of Saline Soil Accumulated with Nitrate and Sulfate

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