Arsenic immobilisation in soil using electricity-induced spreading of iron in situ

被引：7
|
作者：
Kumpiene, Jurate [1 ]
Engstrom, Kajsa [1 ]
Taquia, Aldeir Pinedo [1 ]
Carabante, Ivan [1 ]
Bjuhr, Josef [2 ]
机构：
[1] Lulea Univ Technol, Waste Sci & Technol, S-97187 Lulea, Sweden
[2] AFRY, AF Infrastruct AB, Frosundaleden 2A, S-16970 Solna, Sweden
来源：
JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2023年 / 325卷
关键词：
Soil remediation; Wood impregnation chemicals; Field test; Electrocoagulation; CONTAMINATED SOILS; ZEROVALENT IRON; CHEMICAL STABILIZATION; METAL MOBILITY; REMEDIATION; AMENDMENTS; REMOVAL; WATER; FIELD; PB;
D O I：
10.1016/j.jenvman.2022.116467
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
An in situ method for spreading iron amendments to arsenic (As)-contaminated soil has been investigated in the laboratory and field. This study tested the distribution of Fe from corroding electrodes through soil using a lowvoltage direct current in a laboratory setting and validated the method in the field for As immobilisation in contaminated soil. Laboratory tests revealed that the corrosion of Fe electrodes in soil occurred in a way similar to that during the Fe electrocoagulation in water, which decreased the As concentrations in flow-through water from 150 mu g L-1 to undetectable levels. Method validation over one year in the field using electric current pulses with reversing polarity revealed a decrease in As concentration in groundwater by 72-97% in five of the six groundwater wells within the experimental area. This method of introducing Fe amendments to soil can reduce the need for soil excavation upon chemical immobilisation of contaminants in soil.
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页数：9
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