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Microbial Biofilms for Environmental Bioremediation of Heavy Metals: a Review

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Abstract

Heavy metal pollution caused due to various industrial and mining activities poses a serious threat to all forms of life in the environment because of the persistence and toxicity of metal ions. Microbial-mediated bioremediation including microbial biofilms has received significant attention as a sustainable tool for heavy metal removal as it is considered safe, effective, and feasible. The biofilm matrix is dynamic, having microbial cells as major components with constantly changing and evolving microenvironments. This review summarizes the bioremediation potential of bacterial biofilms for different metal ions. The composition and mechanism of biofilm formation along with interspecies communication among biofilm-forming bacteria have been discussed. The interaction of biofilm-associated microbes with heavy metals takes place through a variety of mechanisms. These include biosorption and bioaccumulation in which the microbes interact with the metal ions leading to their conversion from a highly toxic form to a less toxic form. Such interactions are facilitated via the negative charge of the extracellular polymeric substances on the surface of the biofilm with the positive charge of the metal ions and the high cell densities and high concentrations of cell–cell signaling molecules within the biofilm matrix. Furthermore, the impact of the anodic and cathodic redox potentials in a bioelectrochemical system (BES) for the reduction, removal, and recovery of numerous heavy metal species provides an interesting insight into the bacterial biofilm-mediated bioelectroremediation process. The review concludes that biofilm-linked bioremediation is a viable option for the mitigation of heavy metal pollution in water and ecosystem recovery.

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Authors and Affiliations

  1. Department of Biosciences, Manipal University Jaipur, Jaipur, 303007, Rajasthan, India

    Zainab Syed, Monika Sogani & Jayana Rajvanshi

  2. Department of Mechanical Engineering, Kashi Institute of Technology, Varanasi, 221307, Uttar Pradesh, India

    Kumar Sonu

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  1. Zainab Syed
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  2. Monika Sogani
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  3. Jayana Rajvanshi
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  4. Kumar Sonu
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Zainab Syed, Monika Sogani: conceptualization, writing original draft, reviewing, and editing; Jayana Rajvanshi, Kumar Sonu: writing original draft, reviewing, and editing. All the authors have read and approved the final manuscript.

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Correspondence to Monika Sogani.

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Syed, Z., Sogani, M., Rajvanshi, J. et al. Microbial Biofilms for Environmental Bioremediation of Heavy Metals: a Review. Appl Biochem Biotechnol 195, 5693–5711 (2023). https://doi.org/10.1007/s12010-022-04276-x

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