Study of polluted soil remediation based on freezing
and thawing cycles |
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| Authors: | DaHu Rui BaiYang Song Yuzuru Ito and Li Wang |
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| Institution: | School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China;School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China;Dept. of Civil Engineering, Setsunan University, Neyagawa, Osaka Prefecture 572-0074, Japan;School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China |
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| Abstract: | It is generally known that soil pollution poses a terrible hazard to the environment, but the present techniques of contaminated
soil remediation cannot control this growing threat. This paper compares the pollutant extraction efficiency of
traditional pumping and treating, which is a typical washing technology for the remediation of contaminated soils, with
methods that utilize freeze-thaw cycles. In the soil freezing process, water shifts from unfrozen soils to the freezing front,
and the permeability of soil will be enhanced under certain temperature gradients and water conditions. Therefore, this
paper discusses the purification of contaminated soil through freeze-thaw action. We conducted a cleansing experiment on
clay and silica sand infused with NaCl (simulation of heavy metals) and found that the efficiency of purification was enhanced
remarkably in the latter by the freeze-thaw action. To assess the effective extraction of DNAPLs in soil, we conducted
an experiment on suction by freezing, predicated on the different freezing points of moisture and pollutants. We
found that the permeability coefficient was significantly increased by the freezing-thawing action, enabling the DNAPL
contaminants to be extracted selectively and effectively. |
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| Keywords: | soil pollution remediation washing technology freezing process thawing process moisture migration |
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