TY - JOUR
T1 - Evaluation of self-oxidation and selectivity of iron-based reductant in anaerobic pentachlorophenol contaminated soil
AU - Ren, Yangmin
AU - Lee, Yonghyeon
AU - Cui, Mingcan
AU - Zhou, Yongyue
AU - Liang, Hong
AU - Khim, Jeehyeong
N1 - Funding Information:
Funding: This work was supported by the Korean Ministry of the Environment as a Subsurface Environment Management (SEM) project (No. 2019002480001 ) and Nanjing Science and Technology Program - International Cooperation in Industrial Technology Research and Development (NSTP) project (No. 201911003 ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/2/15
Y1 - 2022/2/15
N2 - Soil contamination due to chlorinated organics prompts an important environmental problem; however, the iron-based reduction materials and complicated ground environment are the main barriers to implementation and promotion of in situ soil remediation. Therefore, this study aims to evaluate the reductants zero-valent iron (ZVI) and its activated carbon composite (AC-ZVI) in terms of their self-oxidation and selectivity in soil experiments. The results indicated that saturated moisture conditions were beneficial for degradation due to the dispersal of the pollutants from soil particles. Particularly, increasing the water/soil ratio to the over-saturated state would decrease the selectivity of ZVI and AC-ZVI. Meanwhile, increasing the reductant loading decreased the selectivity of ZVI and AC-ZVI, whereas the high initial concentration increased the selectivity of AC-ZVI. In addition, the self-oxidation of ZVI (3.0 ×10−3 h−1) is 4.2 times higher than that of AC-ZVI (0.7 ×10−3 h−1), and the selectivity of AC-ZVI (48%) is 6.9 times higher than that of ZVI (7%), which confirmed that AC-ZVI is a superior iron-based amendment in saturated moisture conditions. Therefore, this study provides a reliable and feasible evaluation method for in situ remediation process, and deepens the understanding of the effects of moisture contents.
AB - Soil contamination due to chlorinated organics prompts an important environmental problem; however, the iron-based reduction materials and complicated ground environment are the main barriers to implementation and promotion of in situ soil remediation. Therefore, this study aims to evaluate the reductants zero-valent iron (ZVI) and its activated carbon composite (AC-ZVI) in terms of their self-oxidation and selectivity in soil experiments. The results indicated that saturated moisture conditions were beneficial for degradation due to the dispersal of the pollutants from soil particles. Particularly, increasing the water/soil ratio to the over-saturated state would decrease the selectivity of ZVI and AC-ZVI. Meanwhile, increasing the reductant loading decreased the selectivity of ZVI and AC-ZVI, whereas the high initial concentration increased the selectivity of AC-ZVI. In addition, the self-oxidation of ZVI (3.0 ×10−3 h−1) is 4.2 times higher than that of AC-ZVI (0.7 ×10−3 h−1), and the selectivity of AC-ZVI (48%) is 6.9 times higher than that of ZVI (7%), which confirmed that AC-ZVI is a superior iron-based amendment in saturated moisture conditions. Therefore, this study provides a reliable and feasible evaluation method for in situ remediation process, and deepens the understanding of the effects of moisture contents.
KW - Activated carbon zero-valent iron
KW - Selectivity
KW - Self-oxidation
KW - Soil remediation
UR - http://www.scopus.com/inward/record.url?scp=85116028680&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2021.127322
DO - 10.1016/j.jhazmat.2021.127322
M3 - Article
AN - SCOPUS:85116028680
VL - 424
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
M1 - 127322
ER -