Environmental Engineering Research

  • 제21권3호
  • /
  • Pages.304-310
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  • 2016
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  • 1226-1025(pISSN)
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  • 2005-968X(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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KH2PO4-aided soil washing for removing arsenic from water-stable soil aggregates collected in southern China

  • Zhao, Ranran (College of Ecological Technique and Engineering, Shanghai Institute of Technology) ;
  • Li, Xiaojun (Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences) ;
  • Zhang, Zhiguo (College of Ecological Technique and Engineering, Shanghai Institute of Technology) ;
  • Zhao, Guanghui (Shenyang Academy of Environmental Sciences)
  • 투고 : 2016.03.04
  • 심사 : 2016.05.24
  • 발행 : 2016.09.30
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초록

Removal of arsenic (As) from soil aggregates with particle sizes of > 2.0, 2.0-0.25, 0.25-0.053, < 0.053 mm by soil washing of $KH_2PO_4$ and the kinetics of As releasing from soil aggregates were investigated. Effects of $KH_2PO_4$ concentration, ratio of liquid/soil and washing duration on the removal were fully explored. The results showed that the high As removal was obtained in > 2 mm aggregates (48.56%) and < 0.053 mm aggregates (42.88%) under the optimum condition ($KH_2PO_4$ concentration of 0.1 mol/L, and liquid/soil ratio (10 mL/g) for 360 min). 62.82% of As was extracted from aggregates with size less than 0.25 mm. Only 11.88% was contributed by the large aggregates (> 2.0mm). Using $KH_2PO_4$ washing, it was also found that extracted As is mainly in form of either specifically sorbed As or As associated with oxides of Fe and Al. Elovich model can describe the removal process of As more precisely than Two-constant kinetic models. The optimum washing conditions and removal process is also applied to bulk soil. This technique in this study is reliable, cost-effective and offers a great potential for practical application in soil remediation.

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  2. Review on remediation technologies for arsenic-contaminated soil vol.14, pp.2, 2016, https://doi.org/10.1007/s11783-019-1203-7
  3. Investigation of photo-catalytic removal of arsenic from aqueous solutions using UV/H2O2 in the presence of ZnO nanoparticles vol.207, pp.11, 2016, https://doi.org/10.1080/00986445.2019.1674813
  4. Fe-based layered double hydroxides for removing arsenic from water: sorption-desorption-regeneration vol.19, pp.3, 2016, https://doi.org/10.2166/wh.2021.026
  5. Remediation of arsenic-cationic metals from smelter contaminated soil by washings of Na2EDTA and phosphoric acid: removal efficiencies and mineral transformation vol.42, pp.14, 2021, https://doi.org/10.1080/09593330.2019.1696413
  6. Cleanup of arsenic, cadmium, and lead in the soil from a smelting site using N,N-bis(carboxymethyl)-L-glutamic acid combined with ascorbic acid: A lab-scale experiment vol.296, pp.None, 2016, https://doi.org/10.1016/j.jenvman.2021.113174