Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps

 

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dc.contributor.author Kotsiopoulos, Thanos
dc.contributor.author Harrison, Susan T L
dc.date.accessioned 2017-09-11T08:23:47Z
dc.date.available 2017-09-11T08:23:47Z
dc.date.issued 2015-11
dc.identifier.citation Kotsiopoulos A. and Harrison S. T. L. (2015). Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps. Advanced Materials Research, Biotechnologies in Mining Industry and Environmental Engineering, Volume 1130, 560-563 en_ZA
dc.identifier.issn 1662-8985 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/25140
dc.description.abstract ARD mitigation is considered by reducing the permeability of acid-generating coal interburden waste rock dumps. Fine desulfurised benign tailings were used to conceal exposed surface active sites from air, water and more aggressive sulfur- and iron-oxidizing microorganisms in acidic environments. Test columns containing interburden waste rock co-disposed with benign tailings were configured as either alternating layered covers or as a blended mixture of tailings and discards. Demonstration of the efficacy of the procedure was assessed by analyzing effluent solution concentrations of the concurrently operated simulated ore beds following inoculation with micro-organisms implicated in bioleaching (biotic mode) or in the absence of inoculation (abiotic mode). The presence of fine tailings both minimized the infiltration of oxidants to the porous ore and void space within the packed bed and provided neutralisation. In biotic mode, tests with layered covers of desulfurised tailings were less successful at limiting microbial activity and associated accelerated oxidation reactions. Blended columns resulted in reduced leaching reactions and an increase in the mean residence time of the solution phase. By increasing the solution residence time, an aqueous cover was concurrently formed, evolving into a bifunctional mitigating measure. en_ZA
dc.language eng en_ZA
dc.publisher Trans Tech Publications en_ZA
dc.source Advanced Materials Research en_ZA
dc.source.uri https://www.scientific.net/AMR/Details
dc.subject.other Acid Rock Drainage
dc.subject.other permeability
dc.subject.other benign tailings
dc.subject.other waste rock dumps
dc.title Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps en_ZA
dc.type Journal Article en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Centre for Bioprocess Engineering Research
uct.type.filetype Image
uct.type.filetype Interactive Resource
dc.identifier.apacitation Kotsiopoulos, T., & Harrison, S. T. L. (2015). Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps. <i>Advanced Materials Research</i>, http://hdl.handle.net/11427/25140 en_ZA
dc.identifier.chicagocitation Kotsiopoulos, Thanos, and Susan T L Harrison "Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps." <i>Advanced Materials Research</i> (2015) http://hdl.handle.net/11427/25140 en_ZA
dc.identifier.vancouvercitation Kotsiopoulos T, Harrison STL. Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps. Advanced Materials Research. 2015; http://hdl.handle.net/11427/25140. en_ZA
dc.identifier.ris TY - Journal Article AU - Kotsiopoulos, Thanos AU - Harrison, Susan T L AB - ARD mitigation is considered by reducing the permeability of acid-generating coal interburden waste rock dumps. Fine desulfurised benign tailings were used to conceal exposed surface active sites from air, water and more aggressive sulfur- and iron-oxidizing microorganisms in acidic environments. Test columns containing interburden waste rock co-disposed with benign tailings were configured as either alternating layered covers or as a blended mixture of tailings and discards. Demonstration of the efficacy of the procedure was assessed by analyzing effluent solution concentrations of the concurrently operated simulated ore beds following inoculation with micro-organisms implicated in bioleaching (biotic mode) or in the absence of inoculation (abiotic mode). The presence of fine tailings both minimized the infiltration of oxidants to the porous ore and void space within the packed bed and provided neutralisation. In biotic mode, tests with layered covers of desulfurised tailings were less successful at limiting microbial activity and associated accelerated oxidation reactions. Blended columns resulted in reduced leaching reactions and an increase in the mean residence time of the solution phase. By increasing the solution residence time, an aqueous cover was concurrently formed, evolving into a bifunctional mitigating measure. DA - 2015-11 DB - OpenUCT DP - University of Cape Town J1 - Advanced Materials Research LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 SM - 1662-8985 T1 - Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps TI - Enhancing ARD mitigation by application of benign tailings to reduce the permeability of waste rock dumps UR - http://hdl.handle.net/11427/25140 ER - en_ZA


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