Efficiency assessment of ZVI-based media as fillers in permeable reactive barrier for multiple heavy metal-contaminated groundwater remediation

Four zero valent iron-based composites were prepared and applied as the reactive media of permeable reactive barriers. Batch tests and continuous-flow column experiments were conducted to assess the long-term performance of these composites for possible utilization as fillers for PRB. The experiment...

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Bibliographic Details
Published in:Journal of hazardous materials 2022-02, Vol.424 (Pt C), p.127605-127605, Article 127605
Main Authors: Zhu, Fengyi, Tan, Xuefei, Zhao, Weixin, Feng, Likui, He, Shufei, Wei, Liangliang, Yang, Lin, Wang, Kun, Zhao, Qingliang
Format: Article
Language:English
Subjects:
Groundwater
Groundwater, Permeable reactive barrier
Iron
Metals, Heavy
Multiple heavy metals
Remediation
Water Pollutants, Chemical - analysis
Zero valent iron-based composites
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Summary:Four zero valent iron-based composites were prepared and applied as the reactive media of permeable reactive barriers. Batch tests and continuous-flow column experiments were conducted to assess the long-term performance of these composites for possible utilization as fillers for PRB. The experimental results of the batch tests revealed that in single-metal systems, the removal efficiency of Cu(Ⅱ), Co(Ⅱ), Cr(Ⅵ) and As(Ⅲ) could reach 98% at equilibrium. Equilibrium data showed that composites displayed different selectivity values in binary and quaternary-component systems. For the continuous tests, column filled with chitosan-zero valent iron-based composites, exhibited optimal removal efficiency and achieved average removal values of 98.84%, 88.28%, 95.65% and 87.10% for Cu(Ⅱ), Co(Ⅱ), Cr(Ⅵ) and As(Ⅲ) during the whole 30-day operation, respectively. Dynamic removal improvement of multiple metals was observed with further assembly media, with average removal of 99.11%, 90.05% and 87.34% for Cu(Ⅱ), Co(Ⅱ) and As(Ⅲ), respectively. Combined with superficial characteristic analysis, the functional groups distributed on the surface of composites played a key role in metal sorption. Moreover, the adsorbed Cu(Ⅱ), Co(Ⅱ) and Cr(Ⅵ) gradually transferred to the mobile phase when the operational periods were prolonged, while As(Ⅲ) became more stable. [Display omitted] •Fe0-based composites suitable for permeable reactive barrier (PRB) were synthesized.•Metals exhibited competitive sorption and hydroxyapatite-Fe0 was the most efficient.•Assembling of Fe0-based media benefited for dynamic removal of multi-metals in PRB.•Metals, except As, adsorbed onto PRB composites tended converting into mobile phase.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2021.127605