Using geopolymer to minimise metals leaching from brown coal fly ash

Zou, Linda, Bankowski, Piotr and Hodges, Ray 2003, Using geopolymer to minimise metals leaching from brown coal fly ash, in ISWA 2003 : Proceedings of the International Solid Waste Association World Congress and Ozwaste Trade Exhibition : Sustainability in a New World, International Solid Waste Association, [Vienna, Austria].

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Title Using geopolymer to minimise metals leaching from brown coal fly ash
Author(s) Zou, Linda
Bankowski, Piotr
Hodges, Ray
Conference name International Solid Waste Association World Congress (2003 : Melbourne, Vic.)
Conference location Melbourne, Vic.
Conference dates 9-14 Nov. 2003
Title of proceedings ISWA 2003 : Proceedings of the International Solid Waste Association World Congress and Ozwaste Trade Exhibition : Sustainability in a New World
Editor(s) Robinson, Brian
Publication date 2003
Publisher International Solid Waste Association
Place of publication [Vienna, Austria]
Summary Fly ash is generated from combustion of brown coal in power stations. The majority of fly ash is removed by electrostatic precipitators (ESP) and finally disposed into the landfill as prescribed wastes. A method was studied to add clay materials to the brown coal fly ash in order to form the so-called geopolymer network, which is effective at stopping the metal contents from leaching, and have minimum impact to the environment. The experiments were conducted parallel on leached fly ash and dry precipitator fly ash. The ratios of fly ash and added clay materials were varied to determine the effects of different compositions on leaching rates. Both X-ray diffraction analysis and scanning electron microscopy images showed that as the percentage of fly ash was increased, the formation of geopolymer is reduced. Eighteen metals and heavy metals were targeted during the leaching tests and the leachate samples were analysed using ICP-AES and ICP-MS. It was found that the reduction of metal leaching was achieved by adding up to 60% of fly ash to form the geopolymer like structure. Significant reductions were observed for calcium, strontium and barium. Leached fly ash achieved better stabilisation than dry precipitator fly ash for major elements. It's hard to quantify its effects on trace metals leaching due to their ultra low concentration in the fly ash. The samples spiked with trace metals of lead, zinc, mercury and barium showed remarkable reduction in leaching.
Language eng
Field of Research 059999 Environmental Sciences not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category E1 Full written paper - refereed
Copyright notice ©2003, International Solid Waste Association
Persistent URL http://hdl.handle.net/10536/DRO/DU:30005204

Document type: Conference Paper
Collection: School of Engineering and Technology
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