Remediation of Heavy Metal Contaminated Soil by Leaching with Na2EDTA and STPP
- DOI
- 10.2991/iccte-16.2016.231How to use a DOI?
- Keywords
- STPP;Na2EDTA;Lead;Cadmium;Copper;Composite leaching
- Abstract
The contamination of soils with heavy metals has become a major environmental concern. Extractive-decontamination of the toxic metals (Pb, Cd and Cu) from the contaminated soil using N2EDTA and STPP was evaluated by batch extraction. The influences of mixed liquid concentrations, oscillating time, pH of solutions on leaching efficiency were investigated. Pb, Cd and Cu fractions characteristics were compared before and after leaching to reveal the leaching of them. The extraction efficiencies increased in the order of Pb > Cd > Cu for Na2EDTA, and Cd > Pb>Cu for STPP. Na2EDTA and STPP can coordinate with metal ions in the soil, but the complexing ability of STPP is relatively weak. Synergistic effects on metal leaching with contaminated soil were observed in low solution. However, antagonistic effects on metal leaching were found at higher than 0.01 mol/L. The heavy metal removal efficiency from soil increases with concentrations of mixed solutions and leching time. Metal fractionation analysis showed that the leaching metal was mainly from acid exchangeable, reduction state, oxidation state, while residual state metals were almost unchanged.
- Copyright
- © 2016, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Xiaowen Zhang AU - Rong Yang AU - Mi Li AU - Lifen Liu AU - Ya Yao AU - Ying Peng PY - 2016/01 DA - 2016/01 TI - Remediation of Heavy Metal Contaminated Soil by Leaching with Na2EDTA and STPP BT - Proceedings of the 2016 International Conference on Civil, Transportation and Environment PB - Atlantis Press SP - 1318 EP - 1321 SN - 2352-5401 UR - https://doi.org/10.2991/iccte-16.2016.231 DO - 10.2991/iccte-16.2016.231 ID - Zhang2016/01 ER -