Authors: Pulles, W; Lodewijks, HM; Toerien, A; Muhlbauer, R; van Niekerk, JA; Richardt, A
Editors: Fourie, AB; Tibbett, M
Conference: Mine Closure 2016, 15–17 March, Perth
Published: Australian Centre for Geomechanics, Proceedings of the 11th International Conference on Mine Closure, pp.425-438, Perth
A novel passive bio-neutralisation water treatment process has been applied to treat an acidic mine drainage decant emanating from a closed colliery in northern KwaZulu Natal, South Africa. The process has been implemented to treat 200 m³/day of water and incorporates the following components: a 3.2 km pipeline from the decant point to the water treatment site, a molasses dosing station, a 1,000 m³ bio neutralisation reactor, three aeration cascades to oxidise sulphides, passive sulphide gas extraction to a bio filter to oxidise sulphide gas, three limestone reactors for pH polishing, and an aerobic wetland to remove residual nutrients. The bio-neutralisation technology is a strictly biological process utilising bacterial processes to treat an influent with a pH as low as 2.8 to remove the acidity, iron and aluminium. The plant has already been constructed and commissioning commenced in August 2015.
Keywords: passive treatment, acid mine drainage, coal mining
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, Australian Centre for Geomechanics, Perth, pp. 425-438.
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