Immobilization of Heavy Metals by Solidification/Stabilization of Co-Disposed Flue Gas Desulfurization Brine and Coal Fly Ash

This study presents an innovative stabilization method of fly ash derived from co-combustion of municipal solid waste and sewage sludge. Bottom ash, obtained from the same process, is used as a stabilizing agent. The stabilization method involved the use of two other components—flue gas desulfurization residues and coal fly ash. Leaching tests were performed on stabilized samples, aged in a laboratory at different times. The results reveal the reduction of the concentrations of heavy metals, particularly Zn and Pb about two orders of magnitude lower with respect to fly ash. The immobilization of heavy metals on the solid material mainly depends on three factors—the amount of used ash, the concentrations of Zn and Pb in as-received fly ash and the pH of the solution of the final materials. The inert powder, obtained after the stabilization, is a new eco-material, that is promising to be used as filler in new sustainable composite materials.

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Flue gas desulfurization gypsum and coal fly ash as basic components of prefabricated building materials

Waste Management ◽

10.1016/j.wasman.2012.10.022 ◽

2013 ◽

Vol 33 (3) ◽

pp. 628-633 ◽

Cited By ~ 65

Author(s):

Antonio Telesca ◽

Milena Marroccoli ◽

Daniela Calabrese ◽

Gian Lorenzo Valenti ◽

Fabio Montagnaro

Keyword(s):

Fly Ash ◽

Flue Gas ◽

Building Materials ◽

Coal Fly Ash ◽

Flue Gas Desulfurization ◽

Prefabricated Building

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Selective sulfur removal from semi-dry flue gas desulfurization coal fly ash for concrete and carbon dioxide capture applications

Waste Management ◽

10.1016/j.wasman.2020.12.007 ◽

2021 ◽

Vol 121 ◽

pp. 117-126

Author(s):

Raghavendra Ragipani ◽

Eleanor Escobar ◽

Dale Prentice ◽

Steven Bustillos ◽

Dante Simonetti ◽

...

Keyword(s):

Carbon Dioxide ◽

Fly Ash ◽

Flue Gas ◽

Carbon Dioxide Capture ◽

Coal Fly Ash ◽

Sulfur Removal ◽

Flue Gas Desulfurization

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Mass transport release of heavy metal oxyanions from solidified/stabilized co-disposed flue gas desulfurization brine and coal fly ash monoliths

Environmental Science and Pollution Research ◽

10.1007/s11356-021-12778-0 ◽

2021 ◽

Author(s):

Jay E. Renew ◽

Wenlong Zhang ◽

Ching-Hua Huang

Keyword(s):

Heavy Metal ◽

Fly Ash ◽

Mass Transport ◽

Flue Gas ◽

Coal Fly Ash ◽

Flue Gas Desulfurization

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Leaching Behaviour of Heavy Metals from the Class C Fly Ash-Based Geopolymers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.194-196.798 ◽

2011 ◽

Vol 194-196 ◽

pp. 798-801 ◽

Cited By ~ 1

Author(s):

Xiao Lu Guo ◽

Hui Sheng Shi

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Water Treatment ◽

Flue Gas ◽

Flue Gas Desulfurization ◽

Leaching Behavior ◽

Leaching Behaviour ◽

Class C ◽

Concentration Limits ◽

The U.S

In this paper, leaching behavior of heavy metals from the class C fly ash (CFA)-based geopolymers were studied. The CFA-based geopolymers were prepared from CFA, flue gas desulfurization gypsum (FGDG), and water treatment residual (WTR). The extraction-leaching concentrations of heavy metals from CFA-based geopolymers were lower than their maximum concentration limits according to the U.S. environmental protection law. And the encapsulated and fixed ratios of heavy metals by the CFA-based geopolymers were 96.02~99.88 %. The dynamic real-time leaching concentration of Pb (II) were less than 1.1 µg / L, Cr (VI) less than 3.25 mg / L while Hg (II) less than 4.0 µg / L. Additionally, dynamic accumulated leaching concentrations were increased at the beginning of leaching process then kept stable. The leaching results indicated that the security of heavy metals in CFA-based geopolymer was safe.

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