Chelator-assisted washing for the extraction of lead, copper, and zinc from contaminated soils: A remediation approach

Hasegawa, Hiroshi; Mamun, M. Abdullah Al; Tsukagoshi, Yoshinori; Sawai, Hikaru; Begum, Zinnat A.; Asami, Mashio S.; Maki, Teruya; Rahman, Ismail M.M.

doi:10.1016/j.apgeochem.2019.104397

Cited by 41 publications

(7 citation statements)

References 36 publications

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“…The magnitude of their reduction decreased with the increase of pH. The water-soluble, exchangeable, and carbonate bound fractions were most efficiently washed by GLDA and ISA, especially in the pH of 3.0 and 5.0, which was the same as the research results of commonly used eluents, such as EDTA and citric acid (Begum et al, 2012；;Suanon et al, 2016;Hasegawa et al, 2019). Given that these metal fractions are unstable and sensitive to the change of environmental conditions, causing them to be easily extracted, which explains their low content in the washed soils (Wang et al, 2019;Dolev et al, 2020).…”

Section: Ph Of Biodegradable Chelator Solutionsupporting

confidence: 71%

Remediation of heavy metal contaminated soil by biodegradable chelator–induced washing: Efficiencies and mechanisms

Wang

Pan

Zhang

et al. 2020

Environmental Research

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Biodegradable chelators (BCs) are promising substitutes for conventional washing agents in the remediation of heavy metal contaminated soil with strong complexing ability and less cost. However, great challenges for the applications of BC-assisted washing still exist, such as the assessment of the factor affecting the efficiency of metal removal and the unclear of the metal removal mechanism. Batch washing was therefore explored to evaluate the potential for four BCs for removing Cd, Pb, and Zn from polluted soils. The soil spectroscopic characteristics before and after washing were also investigated. The results demonstrated that iminodisuccinic acid (ISA) and glutamate-N, N-diacetic acid (GLDA) were an appealing alternative to commonly used non-biodegradable ethylenediaminetetraacetic acid, but glucomonocarbonic acid (GCA) and polyaspartic acid (PASP) were less efficient. Optimal parameters of BCs were determined to be a concentration of 50 mmol L −1 , a pH of 5.0, a contact time of 120 min, and a solid/liquid ratio of 1:5, considering metal removal efficiencies and the suitable cost. A single removal washing could be up to 52.39% of Cd, 71.79% of Pb, and 34.13% of Zn from mine soil, and 98.28% of Cd, 91.10% of Pb, and 90.91% of Zn from polluted farmland soil. After washing, the intensity of heavy metal binding to soil colloids increased while the metal mobility reduced because of weakly bound fractions removed by BCs. The BCs-induced soil washing revealed that the possible mechanisms of metal removal included the acid dissolution, ion exchange, and surface complexation. Our findings highlight the potential application of especially ISA and GLDA as efficient washing agents to remove potentially toxic elements from contaminated soils.

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Section: Ph Of Biodegradable Chelator Solutionsupporting

confidence: 71%

Remediation of heavy metal contaminated soil by biodegradable chelator–induced washing: Efficiencies and mechanisms

Wang

Pan

Zhang

et al. 2020

Environmental Research

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“…Concerning heavy metals, lead is one of the most polluting metals distributed in soil due to mining and smelting activities, automobile emissions related to gasoline combustion, battery disposal, chemical production and factory emissions (Fan et al, 2020;Hasegawa et al, 2019;Lei et al, 2020;Liu et al, 2018;Wang et al, 2020). This metal is considered one of the most harmful to the environment as it can negatively affect plant growth and metabolic activities.…”

Section: Introductionmentioning

confidence: 99%

“…(Alaboudi et al, 2018). In turn, these treatments can be classified concerning their application place: in-situ in the contaminated area or ex-situ (if the soil is excavated and further treated in another site) (Gnanasundar and Akshai Raj, 2020;Hasegawa et al, 2019;Liu et al, 2018). Currently, the most usual strategies for heavy metal removal from soils are physical (excavation and landfill disposal) and chemical (soil washing) (Gluhar et al, 2020;Gong et al, 2018;Kim et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Coupling phytoremediation of Pb-contaminated soil and biomass energy production: A comparative Life Cycle Assessment

Espada

Rodríguez

Gari

et al. 2022

Science of The Total Environment

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“…Under acidic conditions (pH 3), the release of lead was significantly lower compared to pH 6. This can be attributed to the weakened complexing ability of EDTA under acidic conditions [49]. At an EDTA concentration of 20 mM, the release rate of lead was only 34.99% (5.56 mM Pb).…”

Section: Effect Of Freeze-thaw Cyclesmentioning

confidence: 99%

Lead Release from Simulated Lead-Containing Jarosite Using Freeze–Thaw Cycling with EDTA

et al. 2023

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Lead is the primary toxic element found in jarosite residue; it is necessary to synthesize simulated lead-containing jarosite residue (SLJS) to investigate its lead release behavior and predict the slag’s stability and potential for secondary environmental pollution. This study explores the ion release behavior, leaching toxicity, and stability of SLJS during freeze–thaw cycles with EDTA (E-FTC). Experimental results demonstrate that the release of lead, iron, and sulfate from SLJS under E-FTC is contingent upon multiple factors, including solution pH, EDTA concentration, freeze–thaw cycles, freezing temperature, and freeze–thaw mode. Specifically, employing an EDTA concentration of 200 mM, a pH of 6, a freezing temperature of −20 °C, and 12 freeze–thaw cycles, the lead release reaches 15.1 mM, accounting for 94.9% of the total lead content, while iron is negligibly released, thus enabling effective separation of lead from iron. Subsequent to E-FTC, the exchangeable lead content exhibits a substantial reduction, accompanied by a marked increase in residual lead, resulting in a remarkable 98% reduction in leaching toxicity. Moreover, the equilibrium concentration of lead in the continuous stable leaching solution is 0.13 mg/L, significantly below the lead toxicity threshold (5 mg/L). Therefore, environmental stability can be greatly enhanced. This study presents a novel approach for the safe disposal of jarosite residue under mild conditions and at low temperatures, contributing to the broader field of environmentally sustainable waste management.

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Chelator-assisted washing for the extraction of lead, copper, and zinc from contaminated soils: A remediation approach

Cited by 41 publications

References 36 publications

Remediation of heavy metal contaminated soil by biodegradable chelator–induced washing: Efficiencies and mechanisms

Remediation of heavy metal contaminated soil by biodegradable chelator–induced washing: Efficiencies and mechanisms

Coupling phytoremediation of Pb-contaminated soil and biomass energy production: A comparative Life Cycle Assessment

Lead Release from Simulated Lead-Containing Jarosite Using Freeze–Thaw Cycling with EDTA

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