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Improved isolation of cadmium from paddy soil by novel technology based on pore water drainage with graphite-contained electro-kinetic geosynthetics

Tang, Xianqiang; Li, Qingyun; Wang, Zhenhua; Hu, Yanping; Hu, Yuan and Scholz, Miklas LU (2018) In Environmental Science and Pollution Research 25(14). p.14244-14253
Abstract

Novel soil remediation equipment based on electro-kinetic geosynthetics (EKG) was developed for in situ isolation of metals from paddy soil. Two mutually independent field plot experiments A and B (with and without electric current applied) were conducted. After saturation using ferric chloride (FeCl3) and calcium chloride (CaCl2), soil water drainage capacity, soil cadmium (Cd) removal performance, energy consumption as well as soil residual of iron (Fe) and chloride (Cl) were assessed. Cadmium dissolved in the soil matrix and resulted in a 100% increase of diethylenetriamine-pentaacetic acid (DTPA) extracted phyto-available Cd. The total soil Cd content reductions were 15.20% and 26.58% for groups A and B,... (More)

Novel soil remediation equipment based on electro-kinetic geosynthetics (EKG) was developed for in situ isolation of metals from paddy soil. Two mutually independent field plot experiments A and B (with and without electric current applied) were conducted. After saturation using ferric chloride (FeCl3) and calcium chloride (CaCl2), soil water drainage capacity, soil cadmium (Cd) removal performance, energy consumption as well as soil residual of iron (Fe) and chloride (Cl) were assessed. Cadmium dissolved in the soil matrix and resulted in a 100% increase of diethylenetriamine-pentaacetic acid (DTPA) extracted phyto-available Cd. The total soil Cd content reductions were 15.20% and 26.58% for groups A and B, respectively, and electric field applications resulted in a 74.87% increase of soil total Cd removal. The electric energy consumption was only 2.17 kWh/m3 for group B. Drainage by gravity contributed to > 90% of the overall soil dewatering capacity. Compared to conventional electro-kinetic technology, excellent and fast soil water drainage resulted in negligible hydrogen ion (H+) and hydroxide ion (OH) accumulation at nearby electrode zones, which addressed the challenge of anode corrosion and cathode precipitation of soil metals. External addition of FeCl3 and CaCl2 caused soil Fe and Cl residuals and led to 4.33–7.59% and 139–172% acceptable augments in soil total Fe and Cl content, correspondingly, if compared to original untreated soils. Therefore, the novel soil remediation equipment developed based on EKG can be regarded as a promising new in situ technology for thoroughly isolating metals from large-scale paddy soil fields.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Anode corrosion and cathode precipitation prevention, Atmospheric acid deposition, Cadmium, Electric energy consumption, Environmental remediation technology, Hazardous material, Paddy soil remediation, Water drainage
in
Environmental Science and Pollution Research
volume
25
issue
14
pages
14244 - 14253
publisher
Springer
external identifiers
  • scopus:85043400226
ISSN
0944-1344
DOI
10.1007/s11356-018-1664-4
language
English
LU publication?
yes
id
c80ea12e-7fe6-4f3a-9aa7-8e62807031dc
date added to LUP
2018-03-20 07:51:46
date last changed
2019-02-20 11:11:13
@article{c80ea12e-7fe6-4f3a-9aa7-8e62807031dc,
  abstract     = {<p>Novel soil remediation equipment based on electro-kinetic geosynthetics (EKG) was developed for in situ isolation of metals from paddy soil. Two mutually independent field plot experiments A and B (with and without electric current applied) were conducted. After saturation using ferric chloride (FeCl<sub>3</sub>) and calcium chloride (CaCl<sub>2</sub>), soil water drainage capacity, soil cadmium (Cd) removal performance, energy consumption as well as soil residual of iron (Fe) and chloride (Cl) were assessed. Cadmium dissolved in the soil matrix and resulted in a 100% increase of diethylenetriamine-pentaacetic acid (DTPA) extracted phyto-available Cd. The total soil Cd content reductions were 15.20% and 26.58% for groups A and B, respectively, and electric field applications resulted in a 74.87% increase of soil total Cd removal. The electric energy consumption was only 2.17 kWh/m<sup>3</sup> for group B. Drainage by gravity contributed to &gt; 90% of the overall soil dewatering capacity. Compared to conventional electro-kinetic technology, excellent and fast soil water drainage resulted in negligible hydrogen ion (H<sup>+</sup>) and hydroxide ion (OH<sup>−</sup>) accumulation at nearby electrode zones, which addressed the challenge of anode corrosion and cathode precipitation of soil metals. External addition of FeCl<sub>3</sub> and CaCl<sub>2</sub> caused soil Fe and Cl residuals and led to 4.33–7.59% and 139–172% acceptable augments in soil total Fe and Cl content, correspondingly, if compared to original untreated soils. Therefore, the novel soil remediation equipment developed based on EKG can be regarded as a promising new in situ technology for thoroughly isolating metals from large-scale paddy soil fields.</p>},
  author       = {Tang, Xianqiang and Li, Qingyun and Wang, Zhenhua and Hu, Yanping and Hu, Yuan and Scholz, Miklas},
  issn         = {0944-1344},
  keyword      = {Anode corrosion and cathode precipitation prevention,Atmospheric acid deposition,Cadmium,Electric energy consumption,Environmental remediation technology,Hazardous material,Paddy soil remediation,Water drainage},
  language     = {eng},
  number       = {14},
  pages        = {14244--14253},
  publisher    = {Springer},
  series       = {Environmental Science and Pollution Research},
  title        = {Improved isolation of cadmium from paddy soil by novel technology based on pore water drainage with graphite-contained electro-kinetic geosynthetics},
  url          = {http://dx.doi.org/10.1007/s11356-018-1664-4},
  volume       = {25},
  year         = {2018},
}