Stabilization of Cd, Ni and Pb in soil using natural zeolite

Shanableh, Abdallah; Kharabsheh, Atef

doi:10.1016/0304-3894(95)00093-3

Cited by 97 publications

(54 citation statements)

References 7 publications

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“…Although the initial concentration in mg/L was the same, the molar concentration was different for each metal. The greater retention of Pb and Cu and the lower sorption of Ni is also observed by others [19,20,[26][27][28]. Lead ion has the smallest approximate effective ionic radius in aqueous solution [47].…”

Section: Batch Sorption Studiesmentioning

confidence: 50%

“…Adding 1% of zeolite to the soil was found sufficient to remediate Pb in soil at a wide range of pH [19] and thus the effect of mixing must be further investigated. In the case of high soil contamination, stabilisation of Pb in soil is very efficient at a natural zeolite dosage from 25 to 40% on a mass basis, while nickel and cadmium are only partly removed at a dosage of 50% [20]. Also the barrier construction equipment constraints may require mixing the clinoptilolite with a filler such as a model soil made from selected graded soil fractions.…”

Section: Introductionmentioning

confidence: 99%

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Metal Retention Experiments for the Design of Soil‐Mix Technology Permeable Reactive Barriers

Ouellet‐Plamondon

Lynch

Al‐Tabbaa

2011

CLEAN Soil Air Water

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Soil-mix technology is effective for the construction of permeable reactive barriers (PRBs) for in situ groundwater treatment. The objective of this study was to perform initial experiments for the design of soil-mix technology PRBs according to (i) sorption isotherm, (ii) reaction kinetics and (iii) mass balance of the contaminants. The four tested reactive systems were: (i) a granular zeolite (clinoptilolite-GZ), (ii) a granular organoclay (GO), (iii) a 1:1-mixture GZ and model sandy clayey soil and (iv) a 1:1:1-mixture of GZ, GO and model soil. The laboratory experiments consisted of batch tests (volume 900 mL and sorbent mass 18 g) with a multimetal solution of Pb, Cu, Zn, Cd and Ni. For the adsorption experiment, the initial concentrations ranged from 0.01 to 0.5 mM (2.5 to 30 mg/L). The maximum metal retention was measured in a batch test (300 mg/L for each metal, volume 900 mL, sorbent mass 90-4.5 g). The reactive material efficiency order was found to be GZ > GZ-soil mix > GZ-soil-GO mix > GO. Langmuir isotherms modelled the adsorption, even in presence of a mixed cations solution. Adsorption was energetically favourable and spontaneous in all cases. Metals were removed according to the second order reaction kinetics; GZ and the 1:1-mix were very similar. The maximum retention capacity was 0.1-0.2 mmol/g for Pb in the presence of clinoptilolite; for Cu, Zn, Cd and Ni, it was below 0.05 mmol/g for the four reactive systems. Mixing granular zeolite, organoclay and model soil increased the chemisorption. Providing that GZ is reactive enough for the specific conditions, GZ can be mixed to obtain the required sorption. Granular clinoptilolite addition to soil is recommended for PRBs for metal contaminated groundwater.

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Section: Batch Sorption Studiesmentioning

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Metal Retention Experiments for the Design of Soil‐Mix Technology Permeable Reactive Barriers

Ouellet‐Plamondon

Lynch

Al‐Tabbaa

2011

CLEAN Soil Air Water

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“…Some authors 15 have used a natural zeolite agent (faujasite and phillipsite) to reduce the leaching of Pb, Cd and Ni from a contaminated soil. The zeolite agent enhanced the sorption capacity of the soil and reduced leaching.…”

Section: ±8mentioning

confidence: 99%

Utilisation of zeolitised coal fly ash as immobilising agent of a metallurgical waste

Fernández‐Pereira

Luna-Galiano

Rodríguez‐Piñero

et al. 2002

J of Chemical Tech & Biotech

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In the work described in this paper, partially zeolitised coal¯y ash from a Spanish power station has been studied as the immobilising agent of an arc furnace dust waste (s-WA). s-WA is a dust coming from the collecting systems of particulate material in a carbon±steel electric arc furnace (EAF). The hazardous metals normally found in this kind of waste are lead, cadmium, and chromium. In addition, the dust usually has a high zinc content resulting from the use of galvanised scrap. Because of its heavy metal content, s-WA is classi®ed as hazardous waste, according to Spanish regulations. Different zeolitisation procedures, depending on the treatment of the¯y ash with NaOH and KOH alkaline solutions, using re¯ux heating and different times of attack were tested. The zeolitised products were studied using XRD in order to characterise the solid phases produced. The solidi®-cation/stabilisation (S/S) trials of s-WA were carried out using the zeolitised ashes, as well as the original coal¯y ash, in mixtures containing 20% (w/w) of ordinary Portland cement. To evaluate the ef®ciency of the immobilisation process, some speci®c criteria were de®ned, with regard to some physical (compressive strength) and chemical (pH and metal concentrations in TCLP leachates) characterists of the S/S solids. Finally, comparisons among the stabilising mixtures were made and the role of the zeolitisation of¯y ash in the S/S process was evaluated.

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“…A adição de zeólita em solo contaminado tem se mostrado significante para reduzir a mobilidade e a assimilação de metais por plantas [2][3][4][5] . A zeólita é um aluminosilicato cristalino com armação estrutural incluindo cavidades ocupadas por cátions grandes e moléculas de água, ambos tendo considerável liberdade de movimento, permitindo troca iônica e desidratação reversível [6][7][8] .…”

Section: Introductionunclassified

Estabilização de solo contaminado com zinco usando zeólitas sintetizadas a partir de cinzas de carvão

Fungaro¹,

Flues²,

Celebroni³

2004

Quím. Nova

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Recebido em 8/9/03; aceito em 4/12/03; publicado na web em 27/05/04 STABILIZATION OF ZINC-CONTAMINED SOIL USING ZEOLITES SYNTHESIZED FROM COAL ASHES. The effect of synthetic zeolites on stabilizing Zn-contaminated soil using 0.01 mol L -1 CaCl 2 leaching solution in batch experiments was investigated. The zeolites were synthesized from coal ash by hydrothermal treatment with alkaline solution. The additive enhanced the sorption capacity of the soil and reduced leaching. Zinc leaching was reduced by more than 80% using a minimum of 10% additive. The higher cation exchange capacity of the zeolite/soil mixtures and higher pH were responsible for stabilizing Zn in soil. The poly(2-aminobenzenesulfonic acid)-coated mercury thin-film electrode was used for the determination of zinc.Keywords: zeolite; stabilization; contaminated soil. INTRODUÇÃOA contaminação de solos por metais pesados pode ter conseqüências desastrosas para o ecossistema como a perda da produtividade agrícola, a redução da qualidade da cadeia alimentar com danos a saúde humana e animal e o envenenamento de fontes de água.Em solos poluídos, os metais podem estar na forma solúvel, adsorvidos na fração inorgânica, complexados com os componentes orgânicos ou simplesmente precipitados. Os contaminantes solúveis estão sujeitos à migração para a solução do solo, assimilação pelas plantas ou organismos aquáticos ou volatilização para a atmosfera. O risco de solos contaminados não pode ser avaliado pela simples concentração total do metal, mas sim pela fração móvel ou biodisponível (fase solúvel) para o meio ambiente.Vários métodos têm sido desenvolvidos para a remediação de metais pesados em solos contaminados 1 . Recentemente, muita atenção tem sido dada ao desenvolvimento de métodos de imobilização in situ ou estabilização química, porque são economicamente mais viáveis e não interferem na paisagem, na hidrologia e no ecossistema natural da região em comparação com as técnicas convencionais de escavação, tratamento e disposição. O principal objetivo da técnica de remediação in situ é aumentar a fixação do elemento tóxico que está potencialmente móvel ou biodisponível pela adição de um estabilizante.A adição de zeólita em solo contaminado tem se mostrado significante para reduzir a mobilidade e a assimilação de metais por plantas 2-5 . A zeólita é um aluminosilicato cristalino com armação estrutural incluindo cavidades ocupadas por cátions grandes e moléculas de água, ambos tendo considerável liberdade de movimento, permitindo troca iônica e desidratação reversível [6][7][8] . Utilizando-se as propriedades das cinzas de carvão é possível convertê-las em material zeolítico após tratamento hidrotérmico em meio alcalino [9][10][11][12][13][14] . A capacidade de troca catiônica das cinzas após o tratamento pode aumentar de 10 a mais de 20 vezes. Uma das principais aplicações do produto zeolítico tem sido na remoção de metais pesados em água [15][16][17][18][19][20][21][22][23][24][25][26] . A combinação das análises voltamétricas com a utilização de eletrodos m...

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Stabilization of Cd, Ni and Pb in soil using natural zeolite

Cited by 97 publications

References 7 publications

Metal Retention Experiments for the Design of Soil‐Mix Technology Permeable Reactive Barriers

Metal Retention Experiments for the Design of Soil‐Mix Technology Permeable Reactive Barriers

Utilisation of zeolitised coal fly ash as immobilising agent of a metallurgical waste

Estabilização de solo contaminado com zinco usando zeólitas sintetizadas a partir de cinzas de carvão

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