Rava, Eleonora Maria ElizabethSchoeman, J.J. (Jakob Johannes)Allison, P.J.Dilsook, V.2009-02-032009-02-032008-04Rava, E, Schoeman, JJ, Allison, PJ & Dilsook, V 2008, 'Management of hydrogen sulphide generation at a Kraft mill effluent plant', Water SA, vol. 34, no. 2, pp. 245-248. [http://www.wrc.org.za/publications_watersa.htm]0378-4738http://hdl.handle.net/2263/8796Communities surrounding an integrated Kraft mill noticed odours from the mill’s effluent treatment plant. A project was therefore commissioned by the mill to proactively manage the odours from both the pulp-processing operations and the effluent treatment plant. This project formed part of a co-ordinated study that was implemented by the mill to limit emissions of the total reduced sulphur (TRS) components from the pulp mill operations. It was found that sulphate-reducing bacteria(SRB) converted the sulphates present in the effluent to hydrogen sulphide (H2S) by dissimilatory respiration. The combined use of a nitrate-releasing biomodifier (Bulab® 9518) and an anthraquinone sulphate-reduction inhibitor (Busperse® 2432) was effective in reducing both SRB activity and H2S levels. The average aqueous H2S levels (40 mg/ℓ) were reduced to between 92% and 99%.enWater Research CouncilBiomodifiersHydrogen sulphideKraft mill effluent plantSulphate-reducing bacteria (SRB)AnthraquinoneSulphate reduction inhibitionSodium nitrateEffluent quality -- TestingFactory and trade waste -- PurificationArticle