Reutilization of immobilized fungus Rhizopus sp. LG04 to reduce toxic chromate

Journal of Applied Microbiology
H LiuG Wang

Abstract

Most of the researches investigating immobilized fungi in chromate [Cr(VI)] bioremediation have used dead cells to adsorb Cr(VI). Therefore, the aim was to identify a Cr(VI)-reducing fungus with the ability of reducing the toxic Cr(VI) into the much less toxic Cr(III) and to apply the immobilized living fungus in continual reduction of Cr(VI). Cr(VI) reduction occurred using both free fungi and immobilized living Rhizopus sp. LG04. The Cr(VI) bioreduction by the free fungi was achieved mainly by bioreduction coupled with a small amount of biosorption on the cell surfaces. LG04 spores immobilized with 3% polyvinyl alcohol and 3% sodium alginate produced the most stable and efficient biobeads. When the LG04 biobeads were washed and transferred into fresh medium containing 42 mg l(-1) of Cr(VI), the biobeads could be reused to reduce Cr(VI) for more than 30 cycles during an 82-day operation period. Interestingly, as the cycles increased, the time required for complete reduction stabilized at approximately 2·5 days, which was faster than that obtained using the free fungi (4·5 days). The pH value of the solution decreased from 6·60 ± 0·10 to 3·85 ± 0·15 after each reduction cycle, which may be because the metabolic products of the ...Continue Reading

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Citations

Sep 30, 2017·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Utkarsh SinghPreeti Sachan
Jun 7, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Rita SinghAntaryami Singh
Dec 24, 2018·The Science of the Total Environment·Shao-Heng LiuJian-Jun Tao
Dec 20, 2018·Critical Reviews in Environmental Science and Technology·Bing WangBin Gao

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