Mobilization of contaminants: Potential for soil remediation and unintended consequences

Kumar, Manish; Bolan, Nanthi; Zad, Tahereh Jasemi; Padhye, Lokesh P.; Sridharan, Srinidhi; Singh, Lal; Bolan, Shiv; O’Connor, James T.; Zhao, Haochen; Shaheen, Sabry M.; Song, Hocheol; Siddique, Kadambot H. M.; Wang, Hailong; Kirkham, M.B.; Rinklebe, Jörg

doi:10.1016/j.scitotenv.2022.156373

Cited by 64 publications

(22 citation statements)

References 293 publications

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“…Different physical, chemical, and biological ex situ and in situ trials can be employed for the remediation of PTEcontaminated soils (Fig. 4), which have been reported in previous studies (e.g., Ali et al 2020a, b;Palansooriya et al 2020;Khan et al 2021;Kumar et al 2022). The PTE clean-up techniques are categorized into containmentbased (e.g., capping/encapsulation), transformation-based (e.g., stabilization/immobilization), and transport-based (e.g., extraction/removal), all employing various physical, chemical, electrical, thermal and biological methods (Khan et al 2021;Kumar et al 2022).…”

Section: Remediation Of Pτε-contaminated Soilsmentioning

confidence: 95%

“…Soil properties affect PTE sorption/availability and thus affect their mobilization (Shaheen et al 2013;Antoniadis et al 2017;Rinklebe et al 2020). Moreover, the fractions and speciation of PTEs in soils affect their solubilization (Rinklebe and Shaheen 2017;Kumar et al 2022). Therefore, understanding the soil and PTE properties is necessary before selecting appropriate soil amendments (Palansooriya et al 2020;Kumar et al 2022).…”

Section: Soil Ptes: Sources Mobilization and Potential Risksmentioning

confidence: 99%

“…Moreover, the fractions and speciation of PTEs in soils affect their solubilization (Rinklebe and Shaheen 2017;Kumar et al 2022). Therefore, understanding the soil and PTE properties is necessary before selecting appropriate soil amendments (Palansooriya et al 2020;Kumar et al 2022). Soil PTEs can be bio-accumulated by plants, thus entering the food chain and raising serious concerns over adverse risks to human health (Fig.…”

Section: Soil Ptes: Sources Mobilization and Potential Risksmentioning

confidence: 99%

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Pros and Cons of Biochar to Soil Potentially Toxic Element Mobilization and Phytoavailability: Environmental Implications

et al. 2022

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While the potential of biochar (BC) to immobilize potentially toxic elements (PTEs) in contaminated soils has been studied and reviewed, no review has focused on the potential use of BC for enhancing the phytoremediation efficacy of PTE-contaminated soils. Consequently, the overarching purpose in this study is to critically review the effects of BC on the mobilization, phytoextraction, phytostabilization, and bioremediation of PTEs in contaminated soils. Potential mechanisms of the interactions between BC and PTEs in soils are also reviewed in detail. We discuss the promises and challenges of various approaches, including potential environmental implications, of BC application to PTE-contaminated soils. The properties of BC (e.g., surface functional groups, mineral content, ionic content, and π-electrons) govern its impact on the (im)mobilization of PTEs, which is complex and highly element-specific. This review demonstrates the contrary effects of BC on PTE mobilization and highlights possible opportunities for using BC as a mobilizing agent for enhancing phytoremediation of PTEs-contaminated soils.

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Section: Remediation Of Pτε-contaminated Soilsmentioning

confidence: 95%

Section: Soil Ptes: Sources Mobilization and Potential Risksmentioning

confidence: 99%

Section: Soil Ptes: Sources Mobilization and Potential Risksmentioning

confidence: 99%

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Pros and Cons of Biochar to Soil Potentially Toxic Element Mobilization and Phytoavailability: Environmental Implications

et al. 2022

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Section: Surfactants and Natural Extractsmentioning

confidence: 99%

“…The eco-sustainability, superior contaminant removal efficiency, flexibility, and the green chemistry basis of surfactants have gained them attention for removing contaminants from their different media ( Rasheed et al, 2020 ; Kumar et al, 2022 ). The surfactant’s unusual molecular structure improves the water solubility of soil pollutants, particularly hydrophobic organic molecules ( He et al, 2016 ).…”

Section: Surfactants and Natural Extractsmentioning

confidence: 99%

A review on the bioleaching of toxic metal(loid)s from contaminated soil: Insight into the mechanism of action and the role of influencing factors

Sarkodie

Jiang

et al. 2022

Front. Microbiol.

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The anthropogenic activities in agriculture, industrialization, mining, and metallurgy combined with the natural weathering of rocks, have led to severe contamination of soils by toxic metal(loid)s. In an attempt to remediate these polluted sites, a plethora of conventional approaches such as Solidification/Stabilization (S/S), soil washing, electrokinetic remediation, and chemical oxidation/reduction have been used for the immobilization and removal of toxic metal(loid)s in the soil. However, these conventional methods are associated with certain limitations. These limitations include high operational costs, high energy demands, post-waste disposal difficulties, and secondary pollution. Bioleaching has proven to be a promising alternative to these conventional approaches in removing toxic metal(loid)s from contaminated soil as it is cost-effective, environmentally friendly, and esthetically pleasing. The bioleaching process is influenced by factors including pH, temperature, oxygen, and carbon dioxide supply, as well as nutrients in the medium. It is crucial to monitor these parameters before and throughout the reaction since a change in any, for instance, pH during the reaction, can alter the microbial activity and, therefore, the rate of metal leaching. However, research on these influencing factors and recent innovations has brought significant progress in bioleaching over the years. This critical review, therefore, presents the current approaches to bioleaching and the mechanisms involved in removing toxic metal(loid)s from contaminated soil. We further examined and discussed the fundamental principles of various influencing factors that necessitate optimization in the bioleaching process. Additionally, the future perspectives on adding omics for bioleaching as an emerging technology are discussed.

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Immobilization: the promising technique to protect and increase the efficiency of microorganisms to remove contaminants

Najim,

Radeef,

al‐Doori

et al. 2024

J of Chemical Tech & Biotech

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Biodegradation is one of the most economical methods and usually no production of toxic by‐products. In general, this approach is favored because it offers reduced expenses and the potential for complete mineralization. In order to enhance the viability and longevity of the bioremediation agents within polluted areas, it becomes necessary to immobilize the cells. Cell immobilization refers to the procedure of confining intact cells to specific areas within a device or material, without compromising their essential biological functions. A wide variety of carriers and approaches have been used for the restriction of various cells. Immobilization techniques, such as microencapsulation, have opened up new possibilities in biotechnology by facilitating the development of artificial organs, cell therapies, and drug delivery systems. Researchers have found promising outcomes in various applications through the immobilization of microorganisms. This approach enhances stability, reusability, and catalytic efficiency, making immobilization a valuable strategy for biocatalysis, bioremediation, and other biotechnological processes. Notably, the use of immobilized microorganisms has led to significant improvements in the removal of pollutants, with some studies achieving 100% efficiency. When comparing the degradation of pollutants between free and immobilized microorganisms over the same time period, the results demonstrated that immobilized microorganisms achieved a removal efficiency of more than 21% than the free microbial consortium. The primary objective of this review is to give an overview of the key scientific aspects related to bioremediation of various pollutants using immobilized cell, with a particular focus on the techniques to entrap the cells.This article is protected by copyright. All rights reserved.

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Mobilization of contaminants: Potential for soil remediation and unintended consequences

Cited by 64 publications

References 293 publications

Pros and Cons of Biochar to Soil Potentially Toxic Element Mobilization and Phytoavailability: Environmental Implications

Pros and Cons of Biochar to Soil Potentially Toxic Element Mobilization and Phytoavailability: Environmental Implications

A review on the bioleaching of toxic metal(loid)s from contaminated soil: Insight into the mechanism of action and the role of influencing factors

Immobilization: the promising technique to protect and increase the efficiency of microorganisms to remove contaminants

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