Combination of microbial oxidation and biogenic schwertmannite immobilization: A potential remediation for highly arsenic-contaminated soil

Here, a novel strategy that combines microbial oxidation by As(III)-oxidizing bacterium and biogenic schwertmannite (Bio-SCH) immobilization was first proposed and applied for treating the highly arsenic-contaminated soil. Brevibacterium sp. YZ-1 isolated from a highly As-contaminated soil was used...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2017-08, Vol.181, p.1-8
Main Authors: Yang, Zhihui, Wu, Zijian, Liao, Yingping, Liao, Qi, Yang, Weichun, Chai, Liyuan
Format: Article
Language:English
Subjects:
Acidithiobacillus - metabolism
Arsenate
Arsenic - isolation & purification
Arsenite
Biodegradation, Environmental
Biogenic schwertmannite
Ferrous Compounds - metabolism
Immobilization
Iron Compounds - chemistry
Microbial oxidation
Oxidation-Reduction
Soil Pollutants - isolation & purification
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Summary:Here, a novel strategy that combines microbial oxidation by As(III)-oxidizing bacterium and biogenic schwertmannite (Bio-SCH) immobilization was first proposed and applied for treating the highly arsenic-contaminated soil. Brevibacterium sp. YZ-1 isolated from a highly As-contaminated soil was used to oxidize As(III) in contaminated soils. Under optimum culture condition for microbial oxidation, 92.3% of water-soluble As(III) and 84.4% of NaHCO3-extractable As(III) in soils were removed. Bio-SCH synthesized through the oxidation of ferrous sulfate by Acidithiobacillus ferrooxidans immobilize As(V) in the contaminated soil effectively. Consequently, the combination of microbial oxidation and Bio-SCH immobilization performed better in treating the highly As-contaminated soil with immobilization efficiencies of 99.3% and 82.6% for water-soluble and NaHCO3-extractable total As, respectively. Thus, the combination can be considered as a green remediation strategy for developing a novel and valuable solution for As-contaminated soils. •The strain YZ-1 was able to oxidize As(III) to As(V) efficiently in the soil.•Biogenic schwertmannite (Bio-SCH) has the advantage of immobilizing As(V).•Microbial oxidation and Bio-SCH immobilization were combined for As-contaminated soil.•The combination is superior to individual methods for treating As-contaminated soil.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2017.04.041