A consistent geochemical modelling approach for the leaching and reactive transport of major and trace elements in MSWI bottom ash

Dijkstra, J.J.; Meeussen, J.C.L.; Sloot, H.A. van der; Comans, R.N.J.

doi:10.1016/j.apgeochem.2007.12.032

Cited by 85 publications

(65 citation statements)

References 40 publications

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“…No caso do chorume, a presença de substân-cias húmicas com alta capacidade de complexar e adsorver metais pesados propicia um meio para adsorção dos mesmos. 22,[54][55][56][57] Outra justificativa é a interação deles com material particulado presente no chorume, uma vez que, de acordo com a literatura, 25,45,46 metais pesados podem apresentar elevadas afinidades por essas espécies.…”

Section: Figura 7 Percentual (M/m) De Mn E Zn Liberados Das Pilhas Eunclassified

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Simulação do intemperismo natural de pilhas zinco-carbono e alcalinas

Câmara¹,

Afonso²,

Silva³

et al. 2012

Quím. Nova

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Recebido em 8/2/11; aceito em 14/6/11; publicado na web em 5/8/11 SIMULATION OF NATUAL WEATHERING OF ZINC-CARBON AND ALKALINE BATTERIES. Spent alkaline and Zn-C batteries were placed in seawater, rainwater or landfill leachate at room temperature for up 30 days in order to simulate natural weathering. After the experiments pH and electrical conductivity of the liquid were measured. The precipitate formed and the filtrate were submitted to metal analysis by ICP-OES. Seawater is the most corrosive medium, followed by landfill leachate. Pb, Cd and Hg were mainly in the filtrate. Fe, Mn and Zn were generally dominant in the precipitate. Na and K account for the electrical conductivity and are good indicators of the corrosion stage of the batteries.Keywords: spent batteries; weathering; heavy metals. INTRODUÇÃOIntemperismo é um conjunto de processos naturais de origem física (desagregação), química (decomposição) e biológica que causa a alteração dos materiais na superfície da Terra ao longo do tempo. 1,2 O produto desta deterioração é uma mistura de novos materiais que são estáveis no ambiente em que se deu a transformação. 1 Esses processos são aplicáveis ao estudo de degradação e/ou decomposição de qualquer material disposto em condições naturais de superfície.A lixiviação é o processo onde constituintes de um material sólido são liberados para o meio ambiente durante o contato com um fluxo de líquido por percolação ou difusão. 3,4 A água, seja como reagente ou como solvente, é o principal agente do intemperismo. 4 A solução contendo constituintes dissolvidos da fase sólida é chamada lixiviado. 3 A capacidade de transferência dos constituintes da fase sólida para o lixiviado (lixiviabilidade) é determinada expondo-se o material a uma solução com características conhecidas e determinando-se o grau de dissolução dos contaminantes. 4 A lixiviabilidade dos componentes depende de diversos fatores: tamanho de partícula (área superficial exposta); temperatura (solubilidade dos solutos na água); tempo de contato (estabelecimento ou não do equilíbrio de lixiviação); 3,4 agitação; relação líquido/sólido; pH (um dos fatores dominantes da mobilidade, solubilidade, complexação e retenção de metais pesados em solos, sedimentos e resíduos); 5,6 condições redox (importante quando os compostos formados na presença de oxigênio têm diferença significativa na solubilidade em relação àqueles formados sob condições redutoras); presença de agentes complexantes, CO 2 e O 2 ; presença de matéria orgânica dissolvida e em suspensão (ela influencia a biodisponibilidade e a mobilidade de metais pesados); 7,8 presença de micro-organismos (intemperismo biológico). [1][2][3]9 A extensão da liberação de constituintes de um resíduo sólido em ensaios de lixiviação é fundamental para definir: 9,10 o potencial de impacto ambiental através do transporte pela água, incluindo solo, lençol freático e contaminação de água de superfície; os riscos ecológicos e para a saúde humana a partir da disposição inadequada no ambiente; a eficácia de processos de tra...

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Section: Figura 7 Percentual (M/m) De Mn E Zn Liberados Das Pilhas Eunclassified

“…22,[53][54][55][56] A pouca variação da condutividade do chorume nos ensaios com todas as pilhas nesse meio (Tabela 1) pode ser explicada com base nesse resultado.…”

Section: Na E Kunclassified

Simulação do intemperismo natural de pilhas zinco-carbono e alcalinas

Câmara¹,

Afonso²,

Silva³

et al. 2012

Quím. Nova

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“…1 , and F À ), and total available trace element concentrations (As, Cd, Cu, Cr, Mo, Pb, Ni, and Zn). In modeling the pH-dependent leaching of trace elements, the total available concentration input in the model can be estimated from ''availability'' tests (Apul et al, 2005) or from the total dissolved concentration of the element measured at the lowest (for cationic species) and highest pH (for anionic species) for a large pH range such as from pH 2-4 to 12 (Dijkstra et al, 2008). In the present study, the highest dissolved concentration measured from the pH-dependent leaching experiments was used as the total available concentration.…”

Section: Methodsmentioning

confidence: 99%

Geochemical Modeling of Trace Element Release from Biosolids

Apul

Diaz

Gustafsson

et al. 2010

Environmental Engineering Science

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Biosolids-borne trace elements may be released to the environment when biosolids are used as fertilizers in farm land. Trace element leachate concentrations from biosolids are known to be limited by both organic and inorganic sorbent surfaces; this experimental evidence has not been previously verified with geochemical modeling of sorption reactions. In this study, pH-dependent leaching experiments and sorption isotherm experiments were coupled with a multisurface geochemical modeling approach. Biosolids samples were obtained from Toledo and Chicago wastewater treatment plants; their sorbent surfaces were defined and modeled as a combination of organic matter (OM) and Fe-, Al-, and Mn-oxides. The multisurface geochemical modeling approach was partially successful in predicting the pH-dependent leachate concentrations of As, Cd, Cr, Cu, Mo, Ni, and Zn. Both modeled and experimental data indicated that As and Mo in biosolids were bound to Fe-oxides; Cd, Cr, and Cu were bound mainly to OM; and as pH increased the fractions of Cd and Cu bound to Fe-oxides in the biosolids matrix increased. Ni and Zn were distributed between OM and Fe-oxides, and the percentage of each fraction depended on the pH. This study showed that the multisurface geochemical model could be used to generate As (and to a lesser extent Cd) Freundlich isotherm parameters for biosolids. However, the composition and reactivity of solid and dissolved OM was identified as a source of uncertainty in the modeling results. Therefore, more detailed studies focusing on the reactivity of isolated biosolids OM fractions with regard to proton and metal binding are needed to improve the capability of geochemical models to predict the fate of biosolids-borne trace metals in the environment.

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“…It is also necessary to evaluate their mobility which is heavily dependent on their chemical form and the type of binding. This has led a number of researchers to study the dissolution behaviour of elements from the sub-products of coal combustion processes and municipal solid waste incinerators that are dumped at disposal sites [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Trace element mobility in water is particularly pH-dependent [6][7]. Several studies have been focused on the leaching behaviour of toxic elements from fly-and bottom ashes [1,3,[8][9][10], and although it has been established that the leaching of major elements from fly ashes is controlled by solubility, the leaching of trace elements cannot be modelled solely on the basis of this factor [7,11]. For instance, Warren and Dudas (1988) [12] have suggested that adsorption and co-precipitation, especially on secondary minerals, may also affect the partitioning of trace elements between the fly ash and the leachate.…”

Section: Introductionmentioning

confidence: 99%

Leaching of major and trace elements from paper–plastic gasification chars: An experimental and modelling study

Fuente-Cuesta

López-Antón

Dı́az-Somoano

et al. 2013

Journal of Hazardous Materials

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The control of soluble metal species in the sub-product leachate generated in electricity production processes is of great concern from an environmental and health point of view. Unlike fly ash, the leaching behaviour of char materials has received little attention. Yet, these solids are captured together with fly ashes in the particle control devices of power plants and are emitted in the same way as by-products. The present study was carried out using two char samples: i) a raw char and ii) the same type of char employed in a previous study so that it could serve as a sorbent for mercury species in gas phase. The char samples were by-products (residues) that had been generated during the gasification of plastic and paper waste. The leachates were analyzed for the following elements: Al, Ca, Si, Mg, Ba, Cu, Ni, Pb, Zn, Mo and Hg. In addition, geochemical modelling of the leaching test results was employed to identify the underlying chemical processes that led to the release of toxic elements. The results showed that at alkaline pH values, sorption on the solid surfaces of the char was negligible due to the inorganic complexation of cations in the solution. When the char was used as mercury sorbent slight changes occurred on the reactive surface resulting in the modification of the binding of some elements. As the pH increased, complexation with dissolved organic matter played a more important role in the case of some elements such as Cu because of the greater concentration of dissolved organic matter in solution.

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A consistent geochemical modelling approach for the leaching and reactive transport of major and trace elements in MSWI bottom ash

Abstract: To improve the long-term environmental risk assessment of waste applications, a predictive ''multi-surface" modelling approach has been developed to simultaneously predict the leaching and reactive transport of a broad range of major and trace elements (i.e.

Cited by 85 publications

References 40 publications

Simulação do intemperismo natural de pilhas zinco-carbono e alcalinas

Simulação do intemperismo natural de pilhas zinco-carbono e alcalinas

Geochemical Modeling of Trace Element Release from Biosolids

Leaching of major and trace elements from paper–plastic gasification chars: An experimental and modelling study

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