Laboratory stabilization/solidification of surrogate and actual mixed-waste sludge in glass and grout

Spence, R. M.; Gilliam, T.M.; Mattus, Catherine H.; Mattus, A.J.

doi:10.1016/s0956-053x(99)00237-8

Cited by 13 publications

(3 citation statements)

References 11 publications

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“…Of particular interest is Cl À , which is difficult to incorporate into conventional hosts and is present in several legacy and defence wastes. [7][8][9] This provides the motivation for the current study.…”

Section: Introductionmentioning

confidence: 99%

A concerted mechanism for Cl⁻migration in chlorapatite

et al. 2014

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Section: Introductionmentioning

confidence: 99%

A concerted mechanism for Cl⁻migration in chlorapatite

et al. 2014

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“…Melting/vitrification has been developed as a proper technology in the further stabilization of ashes, radioactive waste, or sewage sludge. [3][4][5] This technology not only reduces the volume of waste and the mobility of metals but also destroys toxic substances such as polycyclic aromatic hydrocarbons (PAHs) or dioxins. 6 -9 The leaching of hazardous metals has been controlled by stringent regulations.…”

mentioning

confidence: 99%

Effect of SiO₂ on Immobilization of Metals and Encapsulation of a Glass Network in Slag

Kuo

Lin

Tsai

2003

Journal of the Air & Waste Management Association

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The final disposal of ash from an incinerator is of special concern because of the possibility of its releasing toxic substances. Melting/vitrification has been regarded as a prospective technology of ash treatment. The object of this investigation was to evaluate the effect of silica (SiO 2 ) addition on the immobilization of hazardous metals and the encapsulation of a glass network during the vitrification process. Four specimens with SiO 2 /fly ash mixing ratios of 0, 0.1, 0.2, and 0.3, respectively, were tested. The mobility of metals in slag was then estimated by a sequential extraction procedure. X-ray diffraction analysis indicates that SiO 2 leads to the polymerization of silicates.The encapsulation of aluminum, calcium, and magnesium would not be observed unless adequate amount of SiO 2 was added. It was also found that SiO 2 addition enhances the formation of a compact and interconnected glass network structure and, thus, contributes to the chemical stability of metals in slag. After vitrification, the mobility of cadmium, copper, iron, chromium, nickel, lead, and zinc was significantly reduced. However, there is no significant correlation between the immobilization of these metals and the addition of SiO 2 . INTRODUCTIONIncineration, an important technology for the treatment of municipal solid waste (MSW), is used in many countries. 1 In addition to flue gas, MSW ashes (including fly ash and bottom ash) pose a big threat to the environment. 2 Direct landfilling of MSW ashes is no longer an appropriate strategy because of the dwindling number of final disposal sites and the risk of releasing organic toxics and heavy metals. Melting/vitrification has been developed as a proper technology in the further stabilization of ashes, radioactive waste, or sewage sludge. [3][4][5] This technology not only reduces the volume of waste and the mobility of metals but also destroys toxic substances such as polycyclic aromatic hydrocarbons (PAHs) or dioxins. 6 -9 The leaching of hazardous metals has been controlled by stringent regulations. 10 However, a leaching test does not preclude potential long-term pollution. On the other hand, the behavior of the main constituents in a glass network might serve as an indicator for prolonged structure deterioration in slag. During vitrification, the chemical composition of the ternary system (silica [SiO 2 ]-alumina [Al 2 O 3 ]-lime [CaO]) is a major factor controlling the formation of the slag structure. 3,11 Among these constitutes, SiO 2 is of the greatest importance for the main constituents in a glass network when fly ash is vitrified. 12 Therefore, this study focused on the effect of SiO 2 addition on vitrification.In this investigation, the mobility of anthropogenic metals was evaluated by a sequential extraction procedure. Similar methods have been applied to estimate the phase distributions in our previous work and other reports. 8,13 When the slag is recycled, its properties deserve more investigation to insure environmental safety. In previous studies, the ...

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“…Este hecho puede ser debido a la volatilización de parte de los metales durante el proceso de fusión (1500ºC), o a la difusión de ciertas especies en el crisol (Tabla III). El aumento de la concentración de alúmina en los vidrios con respecto a las composiciones calculadas, indica que ha tenido lugar un proceso de difusión y corrosión del crisol durante la fusión del vidrio (13,14). La reducción del contenido de CaO debe estar relacionada, probablemente, con la reacción del vidrio con las paredes del crisol.…”

Section: Resultados Y Discusiónunclassified

Vidrios de silicato a partir de residuos galvánicos con alto contenido en Cr y Ni

Mello-Castanho¹,

Silva²,

Esteban‐Cubillo³

et al. 2006

Bol. Soc. Esp. Ceram. Vidr.

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La eliminación de los residuos industriales tóxicos, es en la actualidad un objetivo prioritario a nivel mundial. Para el caso particular de los residuos sólidos galvánicos, su alto contenido en metales pesados resulta perjudicial tanto para la salud como para el medio ambiente. En este trabajo se han obtenido vídrios con un 40% en peso de residuos galvánicos de alto contenido en cromo y níquel. La estabilidad química de los vídrios obtenidos fue comprobada mediante ensayos de resistencia al ataque hidrolítico, ácido y alcalino. Finalmente, los diferentes vídrios fueron caracterizados por diferentes técnicas difración de rayos-X, fluorescencia de rayos-X, espectrometría infrarroja.. Palabras clave: Lama galvánica, Vídrio silicatos, procesos de inertizatión. Glass silicate from Cr and Ni high level galvanic wasteThe environmental and human health related with harmful industrial waste is nowadays an issue of worldwide great concern. Particularly the case of galvanic solid waste, because of its high content in heavy metals, it is highly harmful from both environmental and human health point of view. In this study, glasses containing up to 40 wt% of galvanic waste with a high content of chromium and nickel were obtained. The chemical stability of these glasses was studied by hydrolytic, alkaline and acid attack. Finally the different glasses were studied by X-ray diffraction, X-ray fluorescence and infrared spectroscopy techniques in order to rationalize and to understand its observed chemical stability.Keywords: Galvanic waste, silicate glass and inertization process. INTRODUCCIÓNLa manipulación y el confinamiento de residuos industriales de probada peligrosidad constituye en la actualidad un objetivo prioritario a nivel mundial dadas sus implicaciones medio ambientales, sanitarias, económicas, industriales y comerciales.Sin embargo, hasta la fecha no existen soluciones técnicas y económicas viables para este tipo de residuos. En el caso específico de lodos galvánicos con gran contenido en metales pesados, su vertido directo al medio ambiente es irresponsable e ilegal. Su almacenamiento en áreas controladas implica un costo adicional creciente que no siempre puede ser soportado por las industrias que lo generan (1-3). Por lo tanto, es necesario desarrollar nuevas tecnologías y procesos industriales que permitan reciclar o inactivar estos residuos galvánicos a un costo razonable.El proceso de vitrificación de estos residuos constituye una de las soluciones más atractivas ya que simula fenómenos que ocurren en la naturaleza como sucede en el caso de los basaltos, donde los cationes que contienen estos vidrios volcánicos son tóxicos en solución pero inertes con respecto al medio ambiente como constituyentes de rocas. Esto se debe al hecho de que los metales pesados se encuentran embebidos en una matriz vítrea, muy estable desde el punto de vista químico, la cual no permite la liberación de cantidades significativas de elementos tóxicos al medio ambiente.La vitrificación de residuos peligrosos ha sido aplicada principa...

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Laboratory stabilization/solidification of surrogate and actual mixed-waste sludge in glass and grout

Cited by 13 publications

References 11 publications

A concerted mechanism for Cl⁻migration in chlorapatite

A concerted mechanism for Cl⁻migration in chlorapatite

Effect of SiO₂ on Immobilization of Metals and Encapsulation of a Glass Network in Slag

Vidrios de silicato a partir de residuos galvánicos con alto contenido en Cr y Ni

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Laboratory stabilization/solidification of surrogate and actual mixed-waste sludge in glass and grout

Cited by 13 publications

References 11 publications

A concerted mechanism for Cl−migration in chlorapatite

A concerted mechanism for Cl−migration in chlorapatite

Effect of SiO2 on Immobilization of Metals and Encapsulation of a Glass Network in Slag

Vidrios de silicato a partir de residuos galvánicos con alto contenido en Cr y Ni

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A concerted mechanism for Cl⁻migration in chlorapatite

A concerted mechanism for Cl⁻migration in chlorapatite

Effect of SiO₂ on Immobilization of Metals and Encapsulation of a Glass Network in Slag