Laboratory Investigation of Heavy Metal Removal by Soil Washing

Abumaizar, Riyad J.; Khan, Lutful I.

doi:10.1080/10473289.1996.10467512

Cited by 72 publications

(47 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…High organic-matter content in the soil affects the washing processes because the high molecular weight humus organic substances have a high affinity for metals and form water-insoluble metal complexes (Peters, 1999). Influence of organic matter on the removal of heavy metals by soil washing techniques employing sodium metabisulfite and EDTA solutions is reported (Abumaizar and Khan, 1996).The present study evaluates and compares the effectiveness of different biodegradable APCs for 4 the washing treatment of organic-rich soil with that of EDTA. The biodegradable APCs are: EDDS, imminodisuccinic acid (IDSA), methylglycinediacetic acid (MGDA), DL-2-(2-carboxymethyl) nitrilotriacetic acid (GLDA) and 3-hydroxy-2,2'-iminodisuccinic acid (HIDS).…”

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confidence: 99%

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Remediation of toxic metal contaminated soil by washing with biodegradable aminopolycarboxylate chelants

et al. 2012

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Ex situ soil washing with synthetic extractants such as, aminopolycarboxylate chelants (APCs) is a viable treatment alternative for metal-contaminated site remediation. EDTA and its homologs are widely used among the APCs in the ex situ soil washing processes. These APCs are merely biodegradable and highly persistent in the aquatic environments leading to the post-use toxic effects.Therefore, an increasing interest is focused on the development and use of the eco-friendly APCs having better biodegradability and less environmental toxicity. The paper deals with the results from the lab-scale washing treatments of a real sample of metal-contaminated soil for the removal of the ecotoxic metal ions (Cd, Cu, Ni, Pb, Zn) using five biodegradable APCs, namely [S,S]-ethylenediaminedisuccinic acid, imminodisuccinic acid, methylglycinediacetic acid, DL-2-(2-carboxymethyl)nitrilotriacetic acid (GLDA) and 3-hydroxy-2,2'-iminodisuccinic acid. The performance of those biodegradable APCs was evaluated for their interaction with the soil mineral constituents in terms of the solution pH and metal-chelant stability constants, and compared with that of EDTA. Speciation calculations were performed to identify the optimal conditions for the washing process in terms of the metal-chelant interactions as well as to understand the selectivity in the separation ability of the biodegradable chelants towards the metal ions. A linear relationship between the metal extraction capacity of the individual chelants towards each of the metal ions from the soil matrix and metal-chelant conditional stability constants for a solution pH greater than 6 was observed. Additional considerations were derived from the behavior of the major potentially interfering cations (Al, Ca, Fe, Mg, and Mn), and it was hypothesized that use of an excess of chelant may minimize the possible competition effects during the single-step washing treatments.Sequential extraction procedure was used to determine the metal distribution in the soil before and after the extractive decontamination using biodegradable APCs, and the capability of the APCs in removing the metal ions even from the theoretically immobilized fraction of the contaminated soil was observed. GLDA appeared to possess the greatest potential to decontaminate the soil through ex situ washing treatment compared to the other biodegradable chelants used in the study. KeywordsSoil remediation; Toxic metals; Ex situ washing; Aminopolycarboxylate chelants; Biodegradable; Sequential extraction 3 IntroductionSoil contamination with heavy metals derived from various anthropogenic activities, including agricultural practices, industrial activities and waste disposal is a worldwide concern. Soil washing is one of the few enduring treatment alternatives, which uses either or both physical and chemical processes, to confine the contaminants in soils (Peters, 1999;Dermont et al., 2008). Soil decontamination by washing treatment can be accomplished through either in situ or ex situ operations. Aminopolycarboxylate c...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Remediation of toxic metal contaminated soil by washing with biodegradable aminopolycarboxylate chelants

et al. 2012

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“…Extensive evaluations of numerous chelating agents have shown that EDTA is one of the most effective solubilizing agents for many metals, including Pb, Cd, Zn, and Mn. [3][4][5][6] Kent et al 7 and Davis et al 8 have conducted tracer tests with several metal-EDTA species. Jardine et al 9 studied the reactions of metal-EDTA species in column systems packed with natural aquifer materials.…”

Section: Discussionmentioning

confidence: 99%

EDTA-Enhanced Extraction of Heavy Metals from a Coarse Grained Simulated Soil by the CEHIXM Process

Karim

Khan

2001

Journal of the Air & Waste Management Association

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The effect of ethylenediaminetetraacetic acid (EDTA) in extracting heavy metal contaminants, namely Pb, Cd, Zn, and Mn, from soils with organometallic complexes, was explored using the coupled electric-hydraulic gradient assisted by ion exchange medium (CEHIXM) decontamination process. The experiments were conducted with a constant electric voltage of 50 DC V and a constant hydraulic flow rate of 4 cm 3 /min. The results obtained from the experiments demonstrated that EDTA was effective in extracting Pb, Cd, Zn, and Mn from soils in which acidic pH did not produce significant dissolution. Metal removal as high as 99% was achieved with 0.05 M EDTA solution within 200 hr.

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“…1,2 They are also encountered in wash solutions from the remediation of metal-contaminated soils. 3,4 It has been recognized that the presence of strong complexing agents such as EDTA (ethylenediaminetetraacetic acid), NTA (nitrilotriacetic acid), citrate, and oxalate cannot be handled satisfactorily using conventional chemical precipitation or coagulation processes such as hydroxides and sul®des. 5 In addition, the high buffer capacity provided by the complexing agents requires excessive amounts of chemicals to neutralize the alkalinity.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium and kinetic studies of the extraction of chelated copper(II) anions with Aliquat 336

Lin

Kao

Huang

et al. 2002

J of Chemical Tech & Biotech

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The equilibrium and kinetics of solvent extraction of Cu 2 from aqueous solutions containing equimolar EDTA with Aliquat 336 in n-decanol and kerosene at 298 K were investigated. The concentrations of Cu 2 (8±50 mol m), and Aliquat 336 (20±100 mol m À3 ) were varied. A semi-empirical model with three parameters was proposed to describe the equilibrium behavior, in which the non-idealities in both aqueous and organic phases were considered. Over the ranges studied, the model agreed reasonably well with the experimental data (standard deviation, 15%). The forward and backward reaction rate constants were determined as (5.31 AE 0.16)Â10 À6 m 9/4 mol À3/4 s À1 and (2.62 AE 0.09)Â10 À7 s À1, respectively, at 298 K. An interfacial reaction mechanism was proposed, which revealed that the reaction between the chelated anions and trimeric amine molecules at the interface was rate limiting. The derived rate laws were consistent with the experimental results.

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Laboratory Investigation of Heavy Metal Removal by Soil Washing

Cited by 72 publications

References 0 publications

Remediation of toxic metal contaminated soil by washing with biodegradable aminopolycarboxylate chelants

Remediation of toxic metal contaminated soil by washing with biodegradable aminopolycarboxylate chelants

EDTA-Enhanced Extraction of Heavy Metals from a Coarse Grained Simulated Soil by the CEHIXM Process

Equilibrium and kinetic studies of the extraction of chelated copper(II) anions with Aliquat 336

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