Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates

M. Polat; Erkan Guler; Eli Lederman; Haim Cohen

doi:10.1016/j.wasman.2006.02.012

Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates

M. Polat, Erkan Guler, Eli Lederman, Haim Cohen

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

An extremely acidic, heavy metal-rich sludge (pH = -1.2) was scrubbed with a Class-F fly ash in order to simultaneously neutralize the acidity and stabilize the heavy metals contained in both wastes. This paper outlines the leaching behavior of the aggregate material generated by scrubbing. For proper fly ash/sludge ratios, the fly ash acted as an outstanding neutralizer for the acidic waste. Leaching of heavy metals from the aggregate samples was below the environmental limits within a pH range between 3 and 9. Subsequent washing of the leached aggregate with acidic CALWET solutions did not result in an additional release of heavy metals. It is proposed that coordinative bonding of the metal cations onto neutral surface sites and electrostatic adsorption led to stabilization of the heavy metals within the aggregate structure below hydrolysis pHs.

Original language	English
Pages (from-to)	482-489
Number of pages	8
Journal	Waste Management
Volume	27
Issue number	4
DOIs	https://doi.org/10.1016/j.wasman.2006.02.012
State	Published - 22 Jan 2007

ASJC Scopus subject areas

Waste Management and Disposal

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10.1016/j.wasman.2006.02.012

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title = "Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates",

abstract = "An extremely acidic, heavy metal-rich sludge (pH = -1.2) was scrubbed with a Class-F fly ash in order to simultaneously neutralize the acidity and stabilize the heavy metals contained in both wastes. This paper outlines the leaching behavior of the aggregate material generated by scrubbing. For proper fly ash/sludge ratios, the fly ash acted as an outstanding neutralizer for the acidic waste. Leaching of heavy metals from the aggregate samples was below the environmental limits within a pH range between 3 and 9. Subsequent washing of the leached aggregate with acidic CALWET solutions did not result in an additional release of heavy metals. It is proposed that coordinative bonding of the metal cations onto neutral surface sites and electrostatic adsorption led to stabilization of the heavy metals within the aggregate structure below hydrolysis pHs.",

author = "M. Polat and Erkan Guler and Eli Lederman and Haim Cohen",

note = "Funding Information: The authors acknowledge the funds from the {\textquoteleft}Dokuz Eyl{\"u}l University Research Fund{\textquoteright} under the projects coded {\textquoteleft}0908.99.05.02{\textquoteright}, {\textquoteleft}0922.99.01.32{\textquoteright} and {\textquoteleft}0908.01.00.02{\textquoteright} and from the Israeli Higher Education Council.",

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doi = "10.1016/j.wasman.2006.02.012",

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AU - Polat, M.

AU - Guler, Erkan

AU - Lederman, Eli

AU - Cohen, Haim

N1 - Funding Information: The authors acknowledge the funds from the ‘Dokuz Eylül University Research Fund’ under the projects coded ‘0908.99.05.02’, ‘0922.99.01.32’ and ‘0908.01.00.02’ and from the Israeli Higher Education Council.

PY - 2007/1/22

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N2 - An extremely acidic, heavy metal-rich sludge (pH = -1.2) was scrubbed with a Class-F fly ash in order to simultaneously neutralize the acidity and stabilize the heavy metals contained in both wastes. This paper outlines the leaching behavior of the aggregate material generated by scrubbing. For proper fly ash/sludge ratios, the fly ash acted as an outstanding neutralizer for the acidic waste. Leaching of heavy metals from the aggregate samples was below the environmental limits within a pH range between 3 and 9. Subsequent washing of the leached aggregate with acidic CALWET solutions did not result in an additional release of heavy metals. It is proposed that coordinative bonding of the metal cations onto neutral surface sites and electrostatic adsorption led to stabilization of the heavy metals within the aggregate structure below hydrolysis pHs.

AB - An extremely acidic, heavy metal-rich sludge (pH = -1.2) was scrubbed with a Class-F fly ash in order to simultaneously neutralize the acidity and stabilize the heavy metals contained in both wastes. This paper outlines the leaching behavior of the aggregate material generated by scrubbing. For proper fly ash/sludge ratios, the fly ash acted as an outstanding neutralizer for the acidic waste. Leaching of heavy metals from the aggregate samples was below the environmental limits within a pH range between 3 and 9. Subsequent washing of the leached aggregate with acidic CALWET solutions did not result in an additional release of heavy metals. It is proposed that coordinative bonding of the metal cations onto neutral surface sites and electrostatic adsorption led to stabilization of the heavy metals within the aggregate structure below hydrolysis pHs.

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DO - 10.1016/j.wasman.2006.02.012

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SP - 482

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JO - Waste Management

JF - Waste Management

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ER -

Neutralization of an extremely acidic sludge and stabilization of heavy metals in flyash aggregates

Abstract

ASJC Scopus subject areas

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