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- Title
Electrokinetics coupling with microbially-induced calcite precipitation that strengthens the chromate removal in the bio-electrochemical system.
- Authors
Tao Huang; Longfei Liu; Shuwen Zhang
- Abstract
Hexavalent chromium (Cr(VI)) is a well-known carcinogen, which must be completely removed from the contaminated water or reduced to a less toxic state. In this work, a bio-electrochemical platform combining electrokinetics (EK) and microbially induced calcite precipitation (MICP) was assembled to enhance Cr(VI) removal from the stocking solution. The chromate was removed mainly by the chemical precipitation of CaCrO4 and further immobilized by CaCO3 produced from the microbial bio-mineralization in the bioremediation. The coupling method was proved to be more effective in increasing the removal efficiencies of Cr(VI) and enhancing the immobilization of Cr(VI) compared with using bioremediation or electrokinetics alone. The maximum efficiency of 97.63% was achieved in the bio-electrochemical experiments. The exchangeable fraction of Cr(VI) was significantly reduced from 40.12% to 22.34% in the precipitation obtained from the bio-electrochemical system. A relatively high voltage was preferred in the coupling system. Generally, the combination of EK and MICP not only strengthened the removal of Cr(VI) from the solution and also significantly reduced the potential re-release of Cr(VI) in the final precipitation.
- Subjects
ELECTROKINETICS; CHROMATES; CALCITE; MICROBIAL remediation; CHROMIUM ions; HEXAVALENT chromium; WATER pollution
- Publication
Desalination & Water Treatment, 2021, Vol 215, p147
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.26810