Mercury removal from flue gas using nitrate as an electron acceptor in a membrane biofilm reactor

Membrane bioreactor achieved mercury removal using nitrate as an electron acceptor. The biological mercury oxidation increased with the increase of oxygen concentration. Ferrous sulfide could make both Hg 2+ and MeHg transform into HgS-like substances. Nitrate drives mercury oxidation through katE,...

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Bibliographic Details
Published in:Frontiers of environmental science & engineering 2022-02, Vol.16 (2), p.20, Article 20
Main Authors: Wei, Zaishan, Tang, Meiru, Huang, Zhenshan, Jiao, Huaiyong
Format: Article
Language:English
Subjects:
Air pollution
Bacteria
Bioaccumulation
Biofilms
Bioreactors
Earth and Environmental Science
Environment
Ferrous sulfide
Flue gas
Halomonas
Iron sulfides
Membranes
Mercury
Mercury (metal)
Mercury removal
Methylation
Microbial community
Microorganisms
Nitrates
Oxidation
Oxygen
Oxygen content
Reactors
Redox reactions
Research Article
Toxicity
Transformation of mercury
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Summary:Membrane bioreactor achieved mercury removal using nitrate as an electron acceptor. The biological mercury oxidation increased with the increase of oxygen concentration. Ferrous sulfide could make both Hg 2+ and MeHg transform into HgS-like substances. Nitrate drives mercury oxidation through katE, katG, nar, nir, nor, and nos. Mercury (Hg 0) is a hazardous air pollutant for its toxicity, and bioaccumulation. This study reported that membrane biofilm reactor achieved mercury removal from flue gas using nitrate as the electron acceptor. Hg 0 removal efficiency was up to 88.7% in 280 days of operation. Oxygen content in flue gas affected mercury redox reactions, mercury biooxidation and microbial methylation. The biological mercury oxidation increased with the increase of oxygen concentration (2%‒17%), methylation of mercury reduced with the increase of oxygen concentration. The dominant bacteria at oxygen concentration of 2%, 6%, 17%, 21% were Halomonas, Anaerobacillus, Halomonas and Pseudomonas, respectively. The addition of ferrous sulfide could immobilize Hg 2+ effectively, and make both Hg 2+ and MeHg transform into HgS-like substances, which could achieve the inhibition effect of methylation, and promote conversion of mercury. The dominant bacteria changed from Halomonas to Planctopirus after FeS addition. Nitrate drives mercury oxidation through katE, katG, nar, nir, nor, and nos for Hg 0 removal in flue gas.
ISSN:2095-2201
2095-221X
DOI:10.1007/s11783-021-1454-y