Zvimba, JNMathye, MVadapalli, VRKSwanepoel, HBologo, L2014-03-252014-03-252013-10Zvimba, J.N, Mathye, M, Vadapalli, V.R.K, Swanepoel, H and Bologo, L. 2013. Fe(II) oxidation during acid mine drainage neutralization in a pilot-scale sequencing batch reactor. Water Science & Technology, vol. 68(6), pp 1406-14110273-1223http://www.ncbi.nlm.nih.gov/pubmed/24056441http://hdl.handle.net/10204/7299Copyright: 2013 IWA Publishing. This is the pre/post print version. The definitive version is published in Water Science & Technology, vol. 68(6), pp 1406-1411This study investigated Fe(II) oxidation during acid mine drainage (AMD) neutralization using CaCO(sub3) in a pilot-scale Sequencing Batch Reactor (SBR) of hydraulic retention time (HRT) of 90 min and sludge retention time (SRT) of 360 min in the presence of air. The removal kinetics of Fe(II), of initial concentration 1,033 ± 0 mg/L, from AMD through oxidation to Fe(III) was observed to depend on both pH and suspended solids, resulting in Fe(II) levels of 679 ± 32, 242 ± 64, 46 ± 16 and 28 ± 0 mg/L recorded after cycles 1, 2, 3 and 4 respectively, with complete Fe(II) oxidation only achieved after complete neutralization of AMD. Generally, it takes 30 min to completely oxidize Fe(II) during cycle 4, suggesting that further optimization of SBR operation based on both pH and suspended solids manipulation can result in significant reduction of the number of cycles required to achieve acceptable Fe(II) oxidation for removal as ferric hydroxide. Overall, complete removal of Fe(II) during AMD neutralization is attractive as it promotes recovery of better quality waste gypsum, key to downstream gypsum beneficiation for recovery of valuables, thereby enabling some treatment-cost recovery and prevention of environmental pollution from dumping of sludge into landfills.enAcid mine drainageFe(II) oxidationSequencing batch reactorArticleZvimba, J., Mathye, M., Vadapalli, V., Swanepoel, H., & Bologo, L. (2013). Fe(II) oxidation during acid mine drainage neutralization in a pilot-scale sequencing batch reactor. http://hdl.handle.net/10204/7299Zvimba, JN, M Mathye, VRK Vadapalli, H Swanepoel, and L Bologo "Fe(II) oxidation during acid mine drainage neutralization in a pilot-scale sequencing batch reactor." (2013) http://hdl.handle.net/10204/7299Zvimba J, Mathye M, Vadapalli V, Swanepoel H, Bologo L. Fe(II) oxidation during acid mine drainage neutralization in a pilot-scale sequencing batch reactor. 2013; http://hdl.handle.net/10204/7299.TY - Article AU - Zvimba, JN AU - Mathye, M AU - Vadapalli, VRK AU - Swanepoel, H AU - Bologo, L AB - This study investigated Fe(II) oxidation during acid mine drainage (AMD) neutralization using CaCO(sub3) in a pilot-scale Sequencing Batch Reactor (SBR) of hydraulic retention time (HRT) of 90 min and sludge retention time (SRT) of 360 min in the presence of air. The removal kinetics of Fe(II), of initial concentration 1,033 ± 0 mg/L, from AMD through oxidation to Fe(III) was observed to depend on both pH and suspended solids, resulting in Fe(II) levels of 679 ± 32, 242 ± 64, 46 ± 16 and 28 ± 0 mg/L recorded after cycles 1, 2, 3 and 4 respectively, with complete Fe(II) oxidation only achieved after complete neutralization of AMD. Generally, it takes 30 min to completely oxidize Fe(II) during cycle 4, suggesting that further optimization of SBR operation based on both pH and suspended solids manipulation can result in significant reduction of the number of cycles required to achieve acceptable Fe(II) oxidation for removal as ferric hydroxide. Overall, complete removal of Fe(II) during AMD neutralization is attractive as it promotes recovery of better quality waste gypsum, key to downstream gypsum beneficiation for recovery of valuables, thereby enabling some treatment-cost recovery and prevention of environmental pollution from dumping of sludge into landfills. DA - 2013-10 DB - ResearchSpace DP - CSIR KW - Acid mine drainage KW - Fe(II) oxidation KW - Sequencing batch reactor LK - https://researchspace.csir.co.za PY - 2013 SM - 0273-1223 T1 - Fe(II) oxidation during acid mine drainage neutralization in a pilot-scale sequencing batch reactor TI - Fe(II) oxidation during acid mine drainage neutralization in a pilot-scale sequencing batch reactor UR - http://hdl.handle.net/10204/7299 ER -