In situ chemical stabilization of trace element-contaminated soil – Field demonstrations and barriers to transition from laboratory to the field – A review

Kumpienė, Jūratė; Antelo, Juan; Brännvall, Evelina; Carabante, Ivan; Ek, Kristina; Komárek, Michael; Söderberg, Charlotta; Wårell, Linda

doi:10.1016/j.apgeochem.2018.12.003

Cited by 105 publications

(50 citation statements)

References 212 publications

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“…Recently, biochar amendment has been investigated to alleviate soil contamination and facilitate soil remediation (Chai et al, 2012;Houben et al, 2013;Koltowski et al, 2016;Ippolito et al, 2017). Existing literature reviews suggest that biochar amendment immobilizes heavy metals and POPs in contaminated soils and reduces their bioavailability primarily through precipitation, electrostatic interaction, surface adsorption, structural sequestration, and facilitated decomposition; the decontamination efficacy varies with the biochar source, amendment rate, soil type, and pollutant species (Ahmad et al, 2014;O'Connor et al, 2018;Zama et al, 2018;Kumpiene et al, 2019;Yuan et al, 2019). Most of the reported research trials were in short-term laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Biochar-Facilitated Soil Remediation: Mechanisms and Efficacy Variations

Guo

Song

Tian

2020

Front. Environ. Sci.

187

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Recent research suggests that biochar amendment is a promising approach to mitigate soil contamination via immobilizing heavy metals and organic pollutants. Through intensive literature review, this paper was aimed to better understand the processes, mechanisms, and effectiveness of biochar in immobilizing chemical contaminants in soil. The quality characteristics of biochar as a soil amendment varied greatly with the feedstock materials and the pyrolysis conditions. Biochar products from different sources demonstrated remarkably diversified capacities and efficiencies for stabilizing soil contaminants. Soil-incorporated biochar was able to stabilize Cd, Cu, Ni, Pb, and Zn and reduce their bioavailability through enhanced sorption (based on electrostatic attraction, ion exchange, and surface complexation) and chemical precipitation (incurred from soil pH elevation and ash addition of carbonates and phosphates). The stabilization efficacy was largely determined by cation exchange capacity, pH, and ash content of the biochar. Biochar amendment increased the mobility of anionic toxic elements [e.g., CrO 2− 4 , AsO − 3 , and Sb(OH) − 6 ] in soil. Soil-incorporated biochar was also able to adsorb non-polar organic compounds (through pore filling, partition, and hydrophobic effect) and polar organic compounds (via H-bonding, electrostatic attraction, specific interaction, and surface precipitation). The adsorption efficiency was controlled by the biochar surface properties specific surface area, microporosity, and hydrophobicity. Biochar may facilitate the mineralization of organic pollutants by enhancing soil microbial activities. The effectiveness of biochar-facilitated soil remediation was case specific, changing with the biochar source, amendment rate, placement, soil type, and pollutant species. More field studies are needed to evaluate the long-term effectiveness of biochar-facilitated soil remediation under practical circumstances.

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Section: Introductionmentioning

confidence: 99%

Biochar-Facilitated Soil Remediation: Mechanisms and Efficacy Variations

Guo

Song

Tian

2020

Front. Environ. Sci.

187

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“…Overall, organic amendments have shown to increase growth and biomass production and improve physiological parameters of candidate species while increasing their ability to withstand accompanying stresses (Clemente et al 2019;Verdugo et al 2011). Nevertheless, organic amendments should be used with caution as they greatly vary in source and composition and can introduce new challenges for plant growth, such as increased electroconductivity, metal solubilization, and the addition of new metal (loids) (Kumpiene et al 2019;Verdugo et al 2011).…”

Section: Plant Selectionmentioning

confidence: 99%

“…Over the years, metal tolerance has been assessed in a large number of species (Kumpiene et al 2019), and while many of them have shown promising results regarding growth on metal-enriched substrates and the expression of metal tolerance traits, the transition from laboratory assays to field experiences has shown contradictory results (Gerhardt et al 2017;Kumpiene et al 2019). Even with the addition of organic amendments, or the introduction of beneficial microorganisms (Gerhardt et al 2017), the presence of secondary environmental limitation may affect the success of phytostabilization practices.…”

Section: Plant Selectionmentioning

confidence: 99%

“…Also, since phytostabilization initiatives aims to achieve a relative sustainability of the system, it would be desirable to carry out field studies with limiting irrigation conditions to expand knowledge on the behavior of different halophyte species under these modified conditions. Large-scale essays are difficult to perform, and most major phytostabilization projects are not scientifically reported (Kumpiene et al 2019). Therefore, it becomes necessary to continue gathering evidence at a small and medium scale to better understand how to improve soil conditions so that candidate species can grow and colonize metal-affected sites in order to achieve the phytostabilization objectives in these challenging ecosystems.…”

Section: Current Experiencesmentioning

confidence: 99%

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Use of Halophytes for the Remediation of Metal-Affected Soils in Arid Environments

Orrego¹

2020

Handbook of Halophytes

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Metal pollution is a long-term and high-scale environmental disturbance that can cause serious effects on soil health, biodiversity, and human communities. One of the alternatives to rehabilitate these areas is phytostabilization, a technique in which plant species are used to decrease the availability of potentially dangerous metals to the environment. However, in metal-affected areas from arid and semiarid ecosystems, a new set of abiotic limitations are introduced. High temperatures, drought, erosion, and soil salinization are some of the conditions that plants have to endure in order to survive and grow in these highly disturbed

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“…Hence, species that are tolerant to high contamination levels and, at the same time, present an extensive fasciculated root system, rapid growth and establishment, high longevity, easy maintenance, good adaptation to contamination and below-ground accumulation of metals are the best candidates for phytostabilization [14][15][16]. The selection of the appropriate amendment or combination of amendments is also crucial for the success of the remediation process [1,14,17]. The interactions between the selected amendment and plant species and the subsequent relationship with the target contaminants will condition the restoration process.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Zero-Valent Iron Has Minimum Toxicological Risk on the Germination and Early Growth of Two Grass Species with Potential for Phytostabilization

et al. 2020

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Two Poaceae species, Agrostis capillaris and Festuca rubra, were selected for their potential as phytostabilizing plants in multicontaminated soils. These species are resistant to contamination and maintain high concentrations of contaminants at the root level. Nanoscale zero-valent iron (nZVI) is an engineered nanomaterial with the ability to stabilize metal(loid)s in soils; its potential toxicological effects in the selected species were studied in a germination test using: (i) control variant without soil; (ii) soil contaminated with Pb and Zn; and (iii) contaminated soil amended with 1% nZVI, as well as in an hydroponic experiment with the addition of nZVI 0, 25, 50 and 100 mg L−1. nZVI had no negative effects on seed germination or seedling growth, but was associated with an increase in shoot growth and reduction of the elongation inhibition rate (root-dependent) of F. rubra seedlings. However, applications of nZVI in the hydroponic solution had no effects on F. rubra but A. capillaris developed longer roots and more biomass. Increasing nZVI concentrations in the growing solution increased Mg and Fe uptake and reduced the Fe translocation factor. Our results indicate that nZVI has few toxic effects on the studied species.

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In situ chemical stabilization of trace element-contaminated soil – Field demonstrations and barriers to transition from laboratory to the field – A review

Cited by 105 publications

References 212 publications

Biochar-Facilitated Soil Remediation: Mechanisms and Efficacy Variations

Biochar-Facilitated Soil Remediation: Mechanisms and Efficacy Variations

Use of Halophytes for the Remediation of Metal-Affected Soils in Arid Environments

Nanoscale Zero-Valent Iron Has Minimum Toxicological Risk on the Germination and Early Growth of Two Grass Species with Potential for Phytostabilization

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