Long-term geochemical evolution of acidic mine wastes under anaerobic conditions

Lu, Wenzhou and Lin, Chuxia and Ma, Yingqun (2013) Long-term geochemical evolution of acidic mine wastes under anaerobic conditions. Environmental Geochemistry and Health , 35 (4). pp. 523-533. ISSN 0269-4042

Abstract

A nearly 5-year anaerobic incubation experiment was conducted to observe the geochemical evolution of an acidic mine waste. Long-term storage of the mine waste under strict anaerobic conditions caused marked increase in aqueous sulfur, while aqueous iron showed no remarkable change. Co-existing oxidation and reduction of elemental sulfur appeared to play a central role in controlling the evolutionary trends of aqueous sulfur and iron. Addition of organic matter increased the aqueous Fe concentration, possibly due to enhanced iron mobilization by microbial iron reduction and increased iron solubility by forming organically complexed Fe species. Further addition of CaCO3 resulted in immobilization of aqueous iron and sulfur due to elevated pH and gypsum formation. The chemical behaviors of environmentally significant metals were markedly affected by the added organic matter; Al, Cr, Cu, Ni and Zn tended to be immobilized probably due to elevated pH and complexation with insoluble organic molecules, while As and Pb tended to be mobilized. Jarosite exhibited high stability after nearly 5 years of anaerobic incubation and even under circumneutral pH conditions. Long-term weathering of aluminosilicate through acid attack raised pH, while continuous reaction between the added CaCO3 and mine waste-borne stored acid decreased pH.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 Springer Science+Business Media Dordrecht. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - USQ Other
Date Deposited: 15 Jul 2013 00:12
Last Modified: 14 Jul 2014 05:51
Uncontrolled Keywords: acidic mine waste; anaerobic condition; geochemical evolution; metal mobilization; sulfates; water parameters
Fields of Research : 05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)
09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
Socio-Economic Objective: D Environment > 96 Environment > 9614 Soils > 961404 Mining Soils
Identification Number or DOI: doi: 10.1007/s10653-013-9512-4
URI: http://eprints.usq.edu.au/id/eprint/23728

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