Cleaner technologies to combat heavy metal toxicity

Rebello, Sharrel; Sivaprasad, M.S.; Anoopkumar, A. N.; Jayakrishnan, Lekshmi; Aneesh, Embalil Mathachan; Narisetty, Vivek; Sindhu, Raveendran; Pugazhendhi, Arivalagan; Pandey, Ashok

doi:10.1016/j.jenvman.2021.113231

Cited by 37 publications

(10 citation statements)

References 119 publications

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“…Heavy metal removal using microbes follows the principles of biosorption and bioaccumulation to remove heavy metals from the polluted environments [ 17 ]. The process of heavy metal biosorption involves the sorption and entrapping of heavy metals onto the outer lipid membrane and sometimes even on the exopolysaccharide secretions of the living or dead heavy metal sequester [ 43 ].…”

Section: Bioengineering Of Microorganisms For Soil Health Restoration By Remediationmentioning

confidence: 99%

“…Soil health restoration is a cumulative outcome of indigenous microbes of the lithosphere [ 14 ]. The advantages of relying on microbes are attributed to their versatility to detoxify a wide variety of pollutants [ 15 ], eco-friendly nature [ 16 , 17 ], ability to enrich soil with nutrients [ 18 ], survival in even harsh environments [ 19 , 20 ], production of plant growth-promoting substances [ 21 ], ease of treatment [ 22 ], and absence of toxic end products [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Bioengineered microbes for soil health restoration: present status and future

et al. 2021

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According to the United Nations Environment Programme (UNEP), soil health is declining over the decades and it has an adverse impact on human health and food security. Hence, soil health restoration is a need of the hour. It is known that microorganisms play a vital role in remediation of soil pollutants like heavy metals, pesticides, hydrocarbons, etc. However, the indigenous microbes have a limited capacity to degrade these pollutants and it will be a slow process. Genetically modified organisms (GMOs) can catalyze the degradation process as their altered metabolic pathways lead to hypersecretions of various biomolecules that favor the bioremediation process. This review provides an overview on the application of bioengineered microorganisms for the restoration of soil health by degradation of various pollutants. It also sheds light on the challenges of using GMOs in environmental application as their introduction may affect the normal microbial community in soil. Since soil health also refers to the potential of native organisms to survive, the possible changes in the native microbial community with the introduction of GMOs are also discussed. Finally, the future prospects of using bioengineered microorganisms in environmental engineering applications to make the soil fertile and healthy have been deciphered. With the alarming rates of soil health loss, the treatment of soil and soil health restoration need to be fastened to a greater pace and the combinatorial efforts unifying GMOs, plant growth-promoting rhizobacteria, and other soil amendments will provide an effective solution to soil heath restoration ten years ahead.

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Section: Bioengineering Of Microorganisms For Soil Health Restoration By Remediationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bioengineered microbes for soil health restoration: present status and future

et al. 2021

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“…Metal-contaminated soils are being remedied using chemical, biological, and physical methods. However, physicochemical methods produce a lot of waste and pollution, so they are not valued [3]. Bioremediation is a cost-effective and practical solution for removing environmental contaminants [4].…”

Section: Introductionmentioning

confidence: 99%

Recent Strategies for Bioremediation of Emerging Pollutants: A Review for a Green and Sustainable Environment

Bala

Garg

Thirumalesh

et al. 2022

Toxics

219

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Environmental pollution brought on by xenobiotics and other related recalcitrant compounds have recently been identified as a major risk to both human health and the natural environment. Due to their toxicity and non-biodegradability, a wide range of pollutants, such as heavy metals, polychlorinated biphenyls, plastics, and various agrochemicals are present in the environment. Bioremediation is an effective cleaning technique for removing toxic waste from polluted environments that is gaining popularity. Various microorganisms, including aerobes and anaerobes, are used in bioremediation to treat contaminated sites. Microorganisms play a major role in bioremediation, given that it is a process in which hazardous wastes and pollutants are eliminated, degraded, detoxified, and immobilized. Pollutants are degraded and converted to less toxic forms, which is a primary goal of bioremediation. Ex situ or in situ bioremediation can be used, depending on a variety of factors, such as cost, pollutant types, and concentration. As a result, a suitable bioremediation method has been chosen. This review focuses on the most recent developments in bioremediation techniques, how microorganisms break down different pollutants, and what the future holds for bioremediation in order to reduce the amount of pollution in the world.

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“…The range of conventional methods for removing heavy metals from aqueous solutions may include techniques such as [18][19][20][21][22][23]: chemical precipitation, oxidation or chemical reduction, ion exchange, filtering, membrane techniques, etc. The literature considers that processes based on these techniques are usually expensive and inefficient, especially for solutions containing ions with concentrations between 1 and 100 mg/L [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Optimization of Heavy Metals Biosorption by Low-Cost Sorbents Using Response Surface Methodology

Ferţu

Bulgariu

2022

Processes

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This paper exploits, through modeling and optimization, the experimental laboratory data on the biosorption of heavy metal ions Pb(II), Cd(II), and Zn(II) from aqueous media using soybean and soybean waste biomasses. The biosorption modeling was performed using the Response Surface Methodology, followed by optimization based on numerical methods. The aim of the modeling was to establish the most probable mathematical relationship between the dependent variables (the biosorption efficiency of the biosorbents when adsorbing metal ions, R(%), and the biosorption capacity of sorbents, q(mg/g)) and the process parameters (pH; sorbent dose, DS (g/L); initial metal ion concentration in solution, c0 (mg/L); contact time, tc (min); temperature, T (°C)), validated by methodologies specific to the multiple regression analysis. Afterward, sets of solutions were obtained through optimization that correlate various values of the process parameters to maximize the objective function. These solutions also confirmed the performance of soybean waste biomass in the removal of heavy metal ions from polluted aqueous effluents. The results were validated experimentally.

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Cleaner technologies to combat heavy metal toxicity

Cited by 37 publications

References 119 publications

Bioengineered microbes for soil health restoration: present status and future

Bioengineered microbes for soil health restoration: present status and future

Recent Strategies for Bioremediation of Emerging Pollutants: A Review for a Green and Sustainable Environment

Modeling and Optimization of Heavy Metals Biosorption by Low-Cost Sorbents Using Response Surface Methodology

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