Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters.

dc.contributor.authorMorgan, B
dc.contributor.authorLoewenthal, R
dc.contributor.authorLahav, O
dc.date.accessioned2016-08-02T13:49:02Z
dc.date.available2016-08-02T13:49:02Z
dc.date.issued2001
dc.date.updated2016-08-02T09:01:51Z
dc.description.abstractA novel approach towards the removal of iron and heavy metals from South African acid mine drainage (AMD) waters is presented. The approach involves the controlled oxidation of ferrous-containing AMD water at ambient temperatures in the presence of magnetite seed. The resulting oxidation product is the ferrite (Ml(2)(3+)M2(2+)O(4)) magnetite (Fe3O4), which has the capacity for non-ferrous metal removal, and which forms a stable sludge that is easily separated from the effluent. Sludge characterisation studies (XRD, SEM and dissolution tests) show that oxidation of ferrous solutions under controlled pH and oxidation conditions (pH 10.5, air flow rate = 0.05 l/min) in the presence of magnetite seed (initial seed : ferrous ratio = 7:1) yields almost pure magnetite at ambient temperature. It was found that magnetite seed channels the end products of the AMD oxidation reaction towards magnetite. Under identical conditions, but in the absence of magnetite seed, a poorly characterised mixture of largely amorphous iron oxides are formed with magnetite comprising not more than 17% of the total iron. The kinetics of the reaction under the investigated conditions were found to be very favourable, with magnetite forming at a rate of 12.8 mg Fe/l/min. The total iron concentration in the affluent was always less than 1 mg/l representing an iron removal efficiency of 99.9%. The precipitant settled well (SVI 8 ml/g) and showed substantial stability at pH 3 (dissolution of 1.1% after 120 h). An outline for a one-step ambient temperature ferrite process is presented.en_ZA
dc.identifier.apacitationMorgan, B., Loewenthal, R., & Lahav, O. (2001). Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters. <i>Water SA</i>, http://hdl.handle.net/11427/21101en_ZA
dc.identifier.chicagocitationMorgan, B, R Loewenthal, and O Lahav "Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters." <i>Water SA</i> (2001) http://hdl.handle.net/11427/21101en_ZA
dc.identifier.citationMorgan, B. E., Loewenthal, R. E., & Lahav, O. (2001). Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters: rapid communication. Water Sa, 27(2), 277-282.en_ZA
dc.identifier.issn0378-4738en_ZA
dc.identifier.ris TY - Journal Article AU - Morgan, B AU - Loewenthal, R AU - Lahav, O AB - A novel approach towards the removal of iron and heavy metals from South African acid mine drainage (AMD) waters is presented. The approach involves the controlled oxidation of ferrous-containing AMD water at ambient temperatures in the presence of magnetite seed. The resulting oxidation product is the ferrite (Ml(2)(3+)M2(2+)O(4)) magnetite (Fe3O4), which has the capacity for non-ferrous metal removal, and which forms a stable sludge that is easily separated from the effluent. Sludge characterisation studies (XRD, SEM and dissolution tests) show that oxidation of ferrous solutions under controlled pH and oxidation conditions (pH 10.5, air flow rate = 0.05 l/min) in the presence of magnetite seed (initial seed : ferrous ratio = 7:1) yields almost pure magnetite at ambient temperature. It was found that magnetite seed channels the end products of the AMD oxidation reaction towards magnetite. Under identical conditions, but in the absence of magnetite seed, a poorly characterised mixture of largely amorphous iron oxides are formed with magnetite comprising not more than 17% of the total iron. The kinetics of the reaction under the investigated conditions were found to be very favourable, with magnetite forming at a rate of 12.8 mg Fe/l/min. The total iron concentration in the affluent was always less than 1 mg/l representing an iron removal efficiency of 99.9%. The precipitant settled well (SVI 8 ml/g) and showed substantial stability at pH 3 (dissolution of 1.1% after 120 h). An outline for a one-step ambient temperature ferrite process is presented. DA - 2001 DB - OpenUCT DP - University of Cape Town J1 - Water SA LK - https://open.uct.ac.za PB - University of Cape Town PY - 2001 SM - 0378-4738 T1 - Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters TI - Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters UR - http://hdl.handle.net/11427/21101 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21101
dc.identifier.vancouvercitationMorgan B, Loewenthal R, Lahav O. Fundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters. Water SA. 2001; http://hdl.handle.net/11427/21101.en_ZA
dc.languageengen_ZA
dc.publisherWater Research Commissionen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_ZA
dc.sourceWater SAen_ZA
dc.source.urihttp://www.wrc.org.za/Pages/KH_WaterSA.aspx?dt=5&L0=1&L1=4
dc.titleFundamental study of a one-step ambient temperature ferrite process for treatment of acid mine drainage waters.en_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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