Arsenic Removal from Contaminated Soil by Phytoremediation Combined with Chemical Immobilization
We have designed a new phytoremediation technique called phytosuction separation (PS-S). To date, it has indicated that the PS-S can remove antimony 69–533 times higher than that removed by phytoextraction (PE). However, it should be deeply investigated that PS-S can effectively remove the metalloid other than antimony. Arsenic-contaminated soil was used in this study. Ferryhydrite synthesized in the laboratory was used as an immobilization material. Four treatments for PS-S were prepared changing the amount of contaminated soil put in the pot: 1.6, 1.0, 0.5, 0.2 cm soil depth, respectively. The removal ratios of PS-S system were higher than that of PE despite the soil depth of PS-S system. The removal ratios of PS-S system increased with the decrease in the soil depth, indicating that the PS-S system could remove arsenic from less than 0.5 cm soil layer. This study indicates that the PS-S system can remove arsenic from the contaminated soil compared with PE, and it can be more effective with more shallow soil layer.
KeywordsArsenic removal Phytoremediation Phytosuction separation Soil pollution Soil remediation
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