Retention of Sulfate-Reducing Bacteria in Expanded Granular-Sludge-Blanket Reactors
Authors: De Smul, Andy; Verstraete, Willy
Source: Water Environment Research, Volume 71, Number 4, July/August 1999 , pp. 427-431(5)
Publisher: Water Environment Federation
Abstract:In acetate-fed, expanded granular-sludge-blanket reactors with a liquid upflow velocity between 3.5 and 4.5 m/h and pH 8.0 to 8.5, calcium-containing tap water tended to select for sulfate-reducing bacteria, whereas demineralized tap water promoted methane production. In a formate-fed, sulfate-reducing, expanded granular-sludge-blanket reactor operated at pH 8.25 to 8.65, maximum sulfate removal rate was 9.5 g sulfur/L·d at the slowest liquid upflow velocity tested (3.0 m/h). The latter was only possible if methane-producing bacteria were repressed by two consecutive doses of 3.85 g/L 2-bromo-ethane sulfonate. These laboratory-scale experiments confirm the presumed limited capacity of sulfate-reducing bacteria to multiply to high biomass densities in upflow reactor systems.
Document Type: Research Article
Publication date: 1999-07-01
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