Removal of toxic heavy metals using genetically engineered microbes: Molecular tools, risk assessment and management strategies

The direct release of industrial effluent into the water and other anthropogenic activities causes water pollution. Heavy metal ions are the primary contaminant in the industrial effluents which are exceptionally toxic at low concentrations, terribly disturb the endurance equilibrium of activities i...

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Veröffentlicht in:Chemosphere (Oxford) 2022-07, Vol.298, p.134341-134341, Article 134341
Hauptverfasser: Saravanan, A., Kumar, P. Senthil, Ramesh, B., Srinivasan, S.
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creator Saravanan, A.
Kumar, P. Senthil
Ramesh, B.
Srinivasan, S.
description The direct release of industrial effluent into the water and other anthropogenic activities causes water pollution. Heavy metal ions are the primary contaminant in the industrial effluents which are exceptionally toxic at low concentrations, terribly disturb the endurance equilibrium of activities in the eco-system and be remarkably hazardous to human health. Different conventional treatment methodologies were utilized for the removal of toxic pollutants from the contaminated water which has several drawbacks such as cost-ineffective and lower efficiency. Recently, genetically modified micro-organisms (GMMs) stand-out for the removal of toxic heavy metals are viewed as an economically plausible and environmentally safe technique. GMMs are microorganisms whose genetic material has been changed utilizing genetic engineering techniques that exhibit enhanced removal efficiency in comparison with the other treatment methodologies. The present review comments the GMMs such as bacteria, algae and fungi and their potential for the removal of toxic heavy metals. This review provides current aspects of different advanced molecular tools which have been used to manipulate micro-organisms through genetic expression for the breakdown of metal compounds in polluted areas. The strategies, major limitations and challenges for genetic engineering of micro-organisms have been reviewed. The current review investigates the approaches working on utilizing genetically modified micro-organisms and effective removal techniques. [Display omitted] •Novel methodology on the removal of heavy metals were detailed.•GMOs are higher effective and considered as promising technique for heavy metal removal.•Extensive improvement of genetically modified micro-organisms by advanced molecular tools was summarized.•Genetic modification permits revamping microbial scavengers for the removal of hazardous pollutants.•Major limitations and challenges in genetic modification have been summarized for large-scale applications.
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subjects Genetic engineering
Heavy metals
Micro-organisms
Modification
Wastewater
title Removal of toxic heavy metals using genetically engineered microbes: Molecular tools, risk assessment and management strategies
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