Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10395385 | Bioresource Technology | 2011 | 6 Pages |
Abstract
The physiological and kinetic behavior of a denitrifying granular sludge exposed to different sulfide loading rates (55-295Â mg/LÂ d) were evaluated in a UASB reactor fed with acetate, ammonium and nitrate. At any sulfide loading rates, the consumption efficiencies of sulfide, acetate and ammonium were above 95%, while nitrate consumption efficiencies were around 62-72%. At the highest sulfide loading rate the ammonium was used as electron donor for N2 production. The increase of sulfide loading rate also affected the fate of sulfide oxidation, since elemental sulfur was the main end product instead of sulfate. However, the lithotrophic denitrifying kinetic was not affected. FISH oligonucleotide probes for Thiobacillus denitrificans, Thiomiscropira denitrificans, genus Paracoccus and Pseudomonas spp. were used to follow the microbial ecology. The results of this work have shown that four pollutants could simultaneously be removed, namely, sulfide, ammonium, acetate and nitrate under well defined denitrifying conditions.
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Authors
Ricardo Beristain-Cardoso, Jorge Gómez, Ramón Méndez-PampÃn,