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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/2153

Title: Biological sulphate removal from acid mine effluent using ethanol as carbon and energy source
Authors: Greben, HA
Maree, JP
Singmin, Y
Mnqanqeni, S
Keywords: Acid mine water
Anaerobic treatment
sulphate reduction
Engineering
Issue Date: 2000
Publisher: I W A Publishing
Citation: Greben HA, et al. 2000. Biological sulphate removal from acid mine effluent using ethanol as carbon and energy source. Water Science and Technology, vol. 42, 04 March, pp 339-344
Abstract: Mining effluents are major contributors to mineralization of receiving waters and can be toxic to man, animals and plants due to unacceptably high concentrations of heavy metals. A biological sulphate removal process has been developed for the treatment of sulphate-rich industrial effluents, where sulphate is converted via sulphide to sulphur in an anaerobic single-stage reactor. Ethanol is used as carbon and energy source. Sulphate was removed from acid mine water over a period of 95 days from 3000 mg/l down to less than 200 mg/l and the formed sulphides to less than 200 mg/l. The VSS value in the reactor varied between 3 and 4 g/l, resulting in a specific sulphate removal rate from 0.47 to 2.47 g SO4/(g VSS.d), while the volumetric rate was 2.5 and 8.4g SO4/(2.d) at HRT of 18 to 4.3 h. The experimental COD/sulphate ratio was between 0.55 and 0.84, which is in accordance with the theoretical value of 0.87. The experimental sulphide/sulphate ratio was less than the theoretical value of 0.33 due to the conversion of sulphate to sulphur and due to metal sulphide precipitation. Iron and copper were removed completely and aluminium, manganese and zinc to less than 4 mg/l.
URI: http://hdl.handle.net/10204/2153
http://hdl.handle.net/10204/2153
ISSN: 0273-1223
Appears in Collections:Pollution and waste
Mining and geoscience
General science, engineering & technology

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