Biofilm mediated strategies to mitigate heavy metal pollution: A critical review in metal bioremediation

Jasu, Amrita; Ray, Rina Rani

doi:10.1016/j.bcab.2021.102183

Cited by 25 publications

(11 citation statements)

References 94 publications

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“…Preserving adsorption sites in autoclaved biofilms indicates their potential as effective biosorbents, even in scenarios where the microbial component is inactive. This resilience expands the scope of biofilm utilization in eco-aquatic technologies for water pollution mitigation, offering a sustainable solution for wastewater treatment and environmental remediation [Jasu and Ray, 2021]. The constancy of biofilm charge properties highlights the importance of understanding the underlying mechanisms of ion adsorption and desorption in biofilms for optimizing their performance in water treatment processes [Bhagwat et al, 2021;Qiongjie et al, 2022].…”

Section: Electric Charge Properties Of Biofilmmentioning

confidence: 90%

Comparative Biosorption Proficiency in Intact and Autoclaved Biofilm Matrices

Kurniawan,

Pramudia,

Susanti

et al. 2024

J. Ecol. Eng.

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The urgent need for technological innovation to combat water pollution underscores the significance of biosorption as a potential solution. The success of biosorption hinges on the careful selection of a suitable biosorbent. Biofilms, composed of microbial communities, emerge as a promising alternative due to their expansive adsorption capacity and ready availability. In practical applications, biosorption is often executed at pollutant concentrations lethal to microbes. Consequently, comprehending the biosorption potential of biofilms with deceased microbes becomes imperative. Notably, biofilms with deceased microbes offer the added advantage of minimizing the risk of pathogenic microbial contamination. Despite this, studies are scarce comparing biosorption between intact biofilms and those with deceased microbes. This comparative analysis could enhance the feasibility of biofilms in biosorption as an eco-aquatic technology for alleviating aquatic pollution. This study aims to scrutinize the biosorption characteristics of intact biofilm (with living microbes) and autoclaved biofilm (with deceased microbes). The methods employed for analyzing biosorption characteristics encompass examining electric charge properties, FTIR spectra analysis, ion adsorption, and ion desorption. The model ions chosen for this study are K⁺ (monovalent ion) and Mg²⁺ (divalent ion). Results indicate that the biofilm's electric charge properties and adsorption capacity remain relatively unchanged post-autoclaving. Based on these findings, it can be concluded that biofilms, whether intact or autoclaved, present substantial potential as biosorbents in the advancement of eco-aquatic technology for mitigating water pollution.

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Section: Electric Charge Properties Of Biofilmmentioning

confidence: 90%

Comparative Biosorption Proficiency in Intact and Autoclaved Biofilm Matrices

Kurniawan,

Pramudia,

Susanti

et al. 2024

J. Ecol. Eng.

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“…Biofilms are effective in removing heavy metals from contaminated sites due to the ability of the extracellular polymeric substances (EPS) matrix to sequester heavy metals, and the microbial cells within the biofilm can bind and detoxify the metals (Jasu & Ray, 2021). According to studies, sub-inhibitory levels of heavy metals, such as nickel, cadmium, and lead, have been found to stimulate biofilm formation.…”

Section: When Compared With Traditional Physical and Chemical Methods...mentioning

confidence: 99%

Biofilm and metallothioneins: A dual approach to bioremediate the heavy metal menace

Roy,

Maitra,

Sarkar

et al. 2023

Environmental Quality Mgmt

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Metallothioneins are a class of proteins produced by both prokaryotes and eukaryotes, having low molecular weight and abundant cysteine residues. These proteins play a humongous role in binding, sequestration, and even buffering of the intracellular metal ions. Though they are a wide class of proteins, much of them are yet to be explored. Their metal binding attribute is unique and they form distinctive metal‐thiolate clusters. They have also been known to have ROS scavenging activities due to the presence of the cysteine residues. Phytochelatins also play major roles in metal sequestration pathways. Biofilms on the other hand are clusters of bacterial cells surrounded by an extracellular matrix of polymeric substances secreted by the bacteria themselves. Biofilms play multiple roles, from nutrient sequestration, stress resistance to surface adherence. But lesser explored arenas include assistance in heavy metal trapping and bio‐remediation. Researchers have conducted studies that have demonstrated increased metal trapping, resistance and uptake in biofilm forming strains than non‐biofilm forming mutants. Therefore, this study would explore the dual role of metallothionein and biofilm in their activity of metal sequestration and heavy metal remediation and provide certain insights so as to keenly understand the correlations between the two.

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“…Thus, most microorganisms in bioleaching systems live in a biofilm (Schippers et al 2013 ; Castro et al 2016 ). Compared with planktonic cells, the biofilm provides a much higher volumetric biomass density and a much more acidic local pH, and the synergy between various strains in a biofilm consortium makes it able to tolerate and survive in harsh bioleaching environments better (Ruiz et al 2008 ; Vera et al 2003 ; Hall-Stoodley et al 2004 ; Jasu et al 2021 ).…”

Section: Biofilm Of Acidophilic Microorganisms In Bioleaching Wlibsmentioning

confidence: 99%

Advances in bioleaching of waste lithium batteries under metal ion stress

Zhang

Shi²,

Tan³

et al. 2023

Bioresour. Bioprocess.

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In modern societies, the accumulation of vast amounts of waste Li-ion batteries (WLIBs) is a grave concern. Bioleaching has great potential for the economic recovery of valuable metals from various electronic wastes. It has been successfully applied in mining on commercial scales. Bioleaching of WLIBs can not only recover valuable metals but also prevent environmental pollution. Many acidophilic microorganisms (APM) have been used in bioleaching of natural ores and urban mines. However, the activities of the growth and metabolism of APM are seriously inhibited by the high concentrations of heavy metal ions released by the bio-solubilization process, which slows down bioleaching over time. Only when the response mechanism of APM to harsh conditions is well understood, effective strategies to address this critical operational hurdle can be obtained. In this review, a multi-scale approach is used to summarize studies on the characteristics of bioleaching processes under metal ion stress. The response mechanisms of bacteria, including the mRNA expression levels of intracellular genes related to heavy metal ion resistance, are also reviewed. Alleviation of metal ion stress via addition of chemicals, such as spermine and glutathione is discussed. Monitoring using electrochemical characteristics of APM biofilms under metal ion stress is explored. In conclusion, effective engineering strategies can be proposed based on a deep understanding of the response mechanisms of APM to metal ion stress, which have been used to improve bioleaching efficiency effectively in lab tests. It is very important to engineer new bioleaching strains with high resistance to metal ions using gene editing and synthetic biotechnology in the near future.

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Biofilm mediated strategies to mitigate heavy metal pollution: A critical review in metal bioremediation

Cited by 25 publications

References 94 publications

Comparative Biosorption Proficiency in Intact and Autoclaved Biofilm Matrices

Comparative Biosorption Proficiency in Intact and Autoclaved Biofilm Matrices

Biofilm and metallothioneins: A dual approach to bioremediate the heavy metal menace

Advances in bioleaching of waste lithium batteries under metal ion stress

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