Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices

F. Rengifo, B. Garbo, A. Quach, Wendell P Ela, Avelino E Saez, D. P. Bimie, C. Franks, B. J J Zelinski, H. Smith, G. Smith

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This work explores the use of an aqueous-based emulsion process to create an epoxy/rubber matrix for separating and encapsulating waste components from salt-laden, arsenic-contaminated, amorphous iron hydrate sludges. Such sludges are generated from conventional water purification precipitation/adsorption processes, used to convert aqueous brine streams to semi-solid waste streams, such as ion exchange/membrane separations, and from other precipitative heavy metal removal operations. In this study, epoxy resin and polystyrene butadiene (PSB) rubber emulsions are mixed together, combined with residual sludge, and cured and dried at 80°C to remove water. The microstructure of the resulting waste form is characterized by scanning electron microscopy (SEM), which confirms that the epoxy/PSB matrix surrounds and encapsulates the arsenic-laden amorphous iron hydrate phase, while allowing the salt to migrate to internal and external surfaces of the sample. Soluble salts leach from the sample at a rate given by diffusion coefficients of the order of 10 -8 cm 2/s. Long-term leaching studies reveal no evidence of iron migration and, by inference, arsenic migration, and demonstrate that diffusivities of the unextracted salt yield teachability indices within regulations for non-hazardous landfill disposal.

Original languageEnglish (US)
Pages (from-to)99-108
Number of pages10
JournalCeramic Transactions
Volume168
StatePublished - 2005

Fingerprint

Bearings (structural)
Arsenic
Solid wastes
Iron
Stabilization
Salts
Polystyrenes
Rubber
Emulsions
Hydrates
Butadiene
Epoxy Resins
Ion exchange membranes
Water
Heavy Metals
Land fill
Waste disposal
Epoxy resins
Leaching
Heavy metals

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Rengifo, F., Garbo, B., Quach, A., Ela, W. P., Saez, A. E., Bimie, D. P., ... Smith, G. (2005). Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices. Ceramic Transactions, 168, 99-108.

Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices. / Rengifo, F.; Garbo, B.; Quach, A.; Ela, Wendell P; Saez, Avelino E; Bimie, D. P.; Franks, C.; Zelinski, B. J J; Smith, H.; Smith, G.

In: Ceramic Transactions, Vol. 168, 2005, p. 99-108.

Research output: Contribution to journalArticle

Rengifo, F, Garbo, B, Quach, A, Ela, WP, Saez, AE, Bimie, DP, Franks, C, Zelinski, BJJ, Smith, H & Smith, G 2005, 'Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices', Ceramic Transactions, vol. 168, pp. 99-108.
Rengifo, F. ; Garbo, B. ; Quach, A. ; Ela, Wendell P ; Saez, Avelino E ; Bimie, D. P. ; Franks, C. ; Zelinski, B. J J ; Smith, H. ; Smith, G. / Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices. In: Ceramic Transactions. 2005 ; Vol. 168. pp. 99-108.
@article{ca2ad40f8015437c9fe92c377ab90f18,
title = "Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices",
abstract = "This work explores the use of an aqueous-based emulsion process to create an epoxy/rubber matrix for separating and encapsulating waste components from salt-laden, arsenic-contaminated, amorphous iron hydrate sludges. Such sludges are generated from conventional water purification precipitation/adsorption processes, used to convert aqueous brine streams to semi-solid waste streams, such as ion exchange/membrane separations, and from other precipitative heavy metal removal operations. In this study, epoxy resin and polystyrene butadiene (PSB) rubber emulsions are mixed together, combined with residual sludge, and cured and dried at 80°C to remove water. The microstructure of the resulting waste form is characterized by scanning electron microscopy (SEM), which confirms that the epoxy/PSB matrix surrounds and encapsulates the arsenic-laden amorphous iron hydrate phase, while allowing the salt to migrate to internal and external surfaces of the sample. Soluble salts leach from the sample at a rate given by diffusion coefficients of the order of 10 -8 cm 2/s. Long-term leaching studies reveal no evidence of iron migration and, by inference, arsenic migration, and demonstrate that diffusivities of the unextracted salt yield teachability indices within regulations for non-hazardous landfill disposal.",
author = "F. Rengifo and B. Garbo and A. Quach and Ela, {Wendell P} and Saez, {Avelino E} and Bimie, {D. P.} and C. Franks and Zelinski, {B. J J} and H. Smith and G. Smith",
year = "2005",
language = "English (US)",
volume = "168",
pages = "99--108",
journal = "Ceramic Transactions",
issn = "1042-1122",
publisher = "American Ceramic Society",

}

TY - JOUR

T1 - Stabilization of arsenic-bearing iron hydroxide solid wastes in polymeric matrices

AU - Rengifo, F.

AU - Garbo, B.

AU - Quach, A.

AU - Ela, Wendell P

AU - Saez, Avelino E

AU - Bimie, D. P.

AU - Franks, C.

AU - Zelinski, B. J J

AU - Smith, H.

AU - Smith, G.

PY - 2005

Y1 - 2005

N2 - This work explores the use of an aqueous-based emulsion process to create an epoxy/rubber matrix for separating and encapsulating waste components from salt-laden, arsenic-contaminated, amorphous iron hydrate sludges. Such sludges are generated from conventional water purification precipitation/adsorption processes, used to convert aqueous brine streams to semi-solid waste streams, such as ion exchange/membrane separations, and from other precipitative heavy metal removal operations. In this study, epoxy resin and polystyrene butadiene (PSB) rubber emulsions are mixed together, combined with residual sludge, and cured and dried at 80°C to remove water. The microstructure of the resulting waste form is characterized by scanning electron microscopy (SEM), which confirms that the epoxy/PSB matrix surrounds and encapsulates the arsenic-laden amorphous iron hydrate phase, while allowing the salt to migrate to internal and external surfaces of the sample. Soluble salts leach from the sample at a rate given by diffusion coefficients of the order of 10 -8 cm 2/s. Long-term leaching studies reveal no evidence of iron migration and, by inference, arsenic migration, and demonstrate that diffusivities of the unextracted salt yield teachability indices within regulations for non-hazardous landfill disposal.

AB - This work explores the use of an aqueous-based emulsion process to create an epoxy/rubber matrix for separating and encapsulating waste components from salt-laden, arsenic-contaminated, amorphous iron hydrate sludges. Such sludges are generated from conventional water purification precipitation/adsorption processes, used to convert aqueous brine streams to semi-solid waste streams, such as ion exchange/membrane separations, and from other precipitative heavy metal removal operations. In this study, epoxy resin and polystyrene butadiene (PSB) rubber emulsions are mixed together, combined with residual sludge, and cured and dried at 80°C to remove water. The microstructure of the resulting waste form is characterized by scanning electron microscopy (SEM), which confirms that the epoxy/PSB matrix surrounds and encapsulates the arsenic-laden amorphous iron hydrate phase, while allowing the salt to migrate to internal and external surfaces of the sample. Soluble salts leach from the sample at a rate given by diffusion coefficients of the order of 10 -8 cm 2/s. Long-term leaching studies reveal no evidence of iron migration and, by inference, arsenic migration, and demonstrate that diffusivities of the unextracted salt yield teachability indices within regulations for non-hazardous landfill disposal.

UR - http://www.scopus.com/inward/record.url?scp=23744448842&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=23744448842&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:23744448842

VL - 168

SP - 99

EP - 108

JO - Ceramic Transactions

JF - Ceramic Transactions

SN - 1042-1122

ER -