Enhanced Cr(VI) removal from groundwater by Fe0-H2O system with bio-amended iron corrosion

Weizhao Yin; Yongtao Li; Jinhua Wu; Guocai Chen; Gangbiao Jiang; Ping Li; Jingjing Gu; Hao Liang; Chuansheng Liu

doi:10.1016/j.jhazmat.2017.02.045

Enhanced Cr(VI) removal from groundwater by Fe⁰-H₂O system with bio-amended iron corrosion

J Hazard Mater. 2017 Jun 15:332:42-50. doi: 10.1016/j.jhazmat.2017.02.045. Epub 2017 Feb 27.

Authors

Weizhao Yin¹, Yongtao Li², Jinhua Wu³, Guocai Chen⁴, Gangbiao Jiang⁵, Ping Li⁴, Jingjing Gu⁶, Hao Liang⁶, Chuansheng Liu⁶

Affiliations

¹ The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; Department of Plant and Environmental Sciences, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg C DK-1871, Denmark.
² School of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China.
³ The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China. Electronic address: jinhuawu@scut.edu.cn.
⁴ The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, State Key Laboratory of Pulp and Paper Engineering, The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China.
⁵ School of Materials and Energy, South China Agricultural University, Guangzhou 510642, PR China.
⁶ Water Purification Institute of Logistics Department of Guangzhou Military Region, Guangzhou 510500, PR China.

PMID: 28279872
DOI: 10.1016/j.jhazmat.2017.02.045

Abstract

A one-pot bio-iron system was established to investigate synergetic abiotic and biotic effects between iron and microorganisms on Cr(VI) removal. More diverse iron corrosion and reactive solids, such as green rusts, lepidocrocite and magnetite were found in the bio-iron system than in the Fe⁰-H₂O system, leading to 4.3 times higher Cr(VI) removal efficiency in the bio-iron system than in the Fe⁰-H₂O system. The cycling experiment also showed that the Cr(VI) removal capacity of Fe⁰ in the bio-iron system was 12.4 times higher than that in the Fe⁰-H₂O system. A 62days of life-span could be achieved in the bio-iron system, while the Fe⁰-H₂O system lost its efficacy after 30days. Enhanced effects of extra Fe²⁺ on Cr(VI) removal was observed, largely contributed to the adsorbed Fe²⁺ on iron surface, which could function as an extra reductant for Cr(VI) and promote the electron transfer on the solid phase. The results also showed that the reduction of Cr(VI) by microorganisms was insignificant, indicating the adsorption/co-precipitation of Cr by iron oxides on iron surface was responsible for the overall Cr(VI) removal. Our study demonstrated that the bio-amended iron corrosion could improve the performance of Fe⁰ for Cr(VI) removal from groundwater.

Keywords: Hexavalent chromium; Reactive minerals; Zero valent iron.

Publication types

Evaluation Study

MeSH terms

Bioreactors
Chromium / isolation & purification*
Corrosion
Groundwater
Iron / chemistry*
Water Pollutants, Chemical / isolation & purification*
Water Purification / methods*

Substances

Water Pollutants, Chemical
Chromium
chromium hexavalent ion
Iron