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Title
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Effect of voltage gradient on energy consumption and chromium ions removal from salt-affected clayey soils
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Abstract
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This study comprehensively investigates the effect of DC voltage gradient (VG) on energy consumption and the removal of ions (total Cr, Na+, Clˉ, and K+) from salt-affected clayey soil. In this work, different VG (i.e., 0.5, 1, and 2 V cm−1) were applied over the artificially contaminated soil for 48 h during electrokinetic experiments to determine the electric potential distribution, electroosmotic flow (EOF), and electric current variation. The results revealed that the VG directly influences the EOF rate and electromigration of ionic species present in the pore solution of the soil samples. The higher removal of ions was achieved with the intensity of applied electric field (EF) due to electromigration and higher EOF rate. Therefore, the maximum ion removal was achieved at 2 V cm−1 [i.e., total Cr (71%), Na+ (91%), Clˉ (64%), and K+ (63%)]. In addition, the EOF rate decreased with increasing treatment time, which was attributed to the progression of acidic-alkaline fronts in soil samples. The collision of acidic-alkaline fronts resulted in a large VG in a narrow soil region of pH jump reducing the EOF and electromigration of ions. Regardless of low EF (i.e., 0.5 V cm−1), the EOF rate and removal of ions decreased [i.e., total Cr (36%), Na+ (58%), Clˉ (45%), and K+ (37%)]. Moreover, the higher EF (i.e., 2 V cm−1) resulted in higher energy consumption (218.6 kWh m−3) and a reduction in the electrical conductivityof soil from 5.2 to 1.29 dS m−1.
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Scientific Type
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غير معروف
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Collaboration type
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مشترك
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Publish Date
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September 19, 2023
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Scopus status
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In Scopus
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Scopus index year
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2 023
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Scopus quarter
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2
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Scopus citation score
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4.400000095
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Clarivate status
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In Clarivate
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Clarivate index year
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2 023
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Clarivate impafact
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2.924999952
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Pub. Med. status
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Not In PubMed
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ISSN
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0021-891X
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Country type
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عالمية
Alnoor University
Springer Nature
Netherlands
College of Health and Medical Technologies
Department of Radiology
Academic Paper 