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Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach

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dc.contributor.author Madzivire, G
dc.contributor.author Gitari, WM
dc.contributor.author Kumar Vadapalli, VR
dc.contributor.author Ojumu, TV
dc.contributor.author Petrik, LF
dc.date.accessioned 2012-01-05T13:32:26Z
dc.date.available 2012-01-05T13:32:26Z
dc.date.issued 2011-10
dc.identifier.citation Madzivire, G, Gitari, WM, Kumar Vadapalli, VR et al. 2011. Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach. Minerals Engineering, Vol 24(13), pp 1467-1477 en_US
dc.identifier.issn 0892-6875
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S089268751100272X
dc.identifier.uri http://hdl.handle.net/10204/5438
dc.description Copyright: 2011 Elsevier. This is an ABSTRACT ONLY en_US
dc.description.abstract The treatment of acid mine drainage (AMD) and circumneutral mine water (CMW) with South African coal fly ash (FA) provides a low cost and alternative technique for treating mine wastes waters. The sulphate concentration in AMD can be reduced significantly when AMD was treated with the FA to pH 9. On the other hand an insignificant amount of sulphate was removed when CMW (containing a very low concentration of Fe and Al) was treated using FA to pH 9. The levels of Fe and Al, and the final solution pH in the AMD–fly ash mixture played a significant role on the level of sulphate removal in contrast to CMW–fly ash mixtures. In this study, a modelling approach using PHREEQC geochemical modelling software was combined with AMD–fly ash and/or CMW–fly ash neutralization experiments in order to predict the mineral phases involved in sulphate removal. The effects of solution pH and Fe and Al concentration in mine water on sulphate were also investigated. The results obtained showed that sulphate, Fe, Al, Mg and Mn removal from AMD and/or CMW with fly ash is a function of solution pH. The presence of Fe and Al in AMD exhibited buffering characteristic leading to more lime leaching from FA into mine water, hence increasing the concentration of Ca2+. This resulted in increased removal of sulphate as CaSO4 2H2O. In addition the sulphate removal was enhanced through the precipitation as Fe and Al oxyhydroxysulphates (as shown by geochemical modelling) in AMD–fly ash system. The low concentration of Fe and Al in CMW resulted in sulphate removal depending mainly on CaSO4 2H2O. The results of this study would have implications on the design of treatment methods relevant for different mine waters. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Workflow request;7832
dc.subject Fly ash en_US
dc.subject Circumneutral mine water en_US
dc.subject Acid mine drainage en_US
dc.subject PHREEQC geochemical modelling en_US
dc.subject Sulphates en_US
dc.subject Minerals engineering en_US
dc.subject Mine water en_US
dc.title Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach en_US
dc.type Article en_US
dc.identifier.apacitation Madzivire, G., Gitari, W., Kumar Vadapalli, V., Ojumu, T., & Petrik, L. (2011). Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach. http://hdl.handle.net/10204/5438 en_ZA
dc.identifier.chicagocitation Madzivire, G, WM Gitari, VR Kumar Vadapalli, TV Ojumu, and LF Petrik "Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach." (2011) http://hdl.handle.net/10204/5438 en_ZA
dc.identifier.vancouvercitation Madzivire G, Gitari W, Kumar Vadapalli V, Ojumu T, Petrik L. Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach. 2011; http://hdl.handle.net/10204/5438. en_ZA
dc.identifier.ris TY - Article AU - Madzivire, G AU - Gitari, WM AU - Kumar Vadapalli, VR AU - Ojumu, TV AU - Petrik, LF AB - The treatment of acid mine drainage (AMD) and circumneutral mine water (CMW) with South African coal fly ash (FA) provides a low cost and alternative technique for treating mine wastes waters. The sulphate concentration in AMD can be reduced significantly when AMD was treated with the FA to pH 9. On the other hand an insignificant amount of sulphate was removed when CMW (containing a very low concentration of Fe and Al) was treated using FA to pH 9. The levels of Fe and Al, and the final solution pH in the AMD–fly ash mixture played a significant role on the level of sulphate removal in contrast to CMW–fly ash mixtures. In this study, a modelling approach using PHREEQC geochemical modelling software was combined with AMD–fly ash and/or CMW–fly ash neutralization experiments in order to predict the mineral phases involved in sulphate removal. The effects of solution pH and Fe and Al concentration in mine water on sulphate were also investigated. The results obtained showed that sulphate, Fe, Al, Mg and Mn removal from AMD and/or CMW with fly ash is a function of solution pH. The presence of Fe and Al in AMD exhibited buffering characteristic leading to more lime leaching from FA into mine water, hence increasing the concentration of Ca2+. This resulted in increased removal of sulphate as CaSO4 2H2O. In addition the sulphate removal was enhanced through the precipitation as Fe and Al oxyhydroxysulphates (as shown by geochemical modelling) in AMD–fly ash system. The low concentration of Fe and Al in CMW resulted in sulphate removal depending mainly on CaSO4 2H2O. The results of this study would have implications on the design of treatment methods relevant for different mine waters. DA - 2011-10 DB - ResearchSpace DP - CSIR KW - Fly ash KW - Circumneutral mine water KW - Acid mine drainage KW - PHREEQC geochemical modelling KW - Sulphates KW - Minerals engineering KW - Mine water LK - https://researchspace.csir.co.za PY - 2011 SM - 0892-6875 T1 - Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach TI - Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach UR - http://hdl.handle.net/10204/5438 ER - en_ZA


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