Effect of sulfide removal on sulfate reduction at pH 5 in a hydrogen fed gas-lift bioreactor.
2008 (English)In: Journal of Microbiology and Biotechnology, ISSN 1017-7825, E-ISSN 1738-8872, Vol. 18, no 11, 1809-18 p.Article in journal (Refereed) Published
Biotechnological treatment of sulfate- and metal-ionscontaining acidic wastewaters from mining and metallurgical activities utilizes sulfate-reducing bacteria to produce sulfide that can subsequently precipitate metal ions. Reducing sulfate at a low pH has several advantages above neutrophilic sulfate reduction. This study describes the effect of sulfide removal on the reactor performance and microbial community in a high-rate sulfidogenic gas-lift bioreactor fed with hydrogen at a controlled internal pH of 5. Under sulfide removal conditions, 99% of the sulfate was converted at a hydraulic retention time of 24 h, reaching a volumetric activity as high as 51 mmol sulfate/l/d. Under nonsulfide removal conditions, <25% of the sulfate was converted at a hydraulic retention time of 24 h reaching volumetric activities of <13mmol sulfate/l/d. The absence of sulfide removal at a hydraulic retention time of 24 h resulted in an average H2S concentration of 18.2 mM (584 mg S/l). The incomplete sulfate removal was probably due to sulfide inhibition. Molecular phylogenetic analysis identified 11 separate 16S rRNA bands under sulfide stripping conditions, whereas under nonsulfide removal conditions only 4 separate 16S rRNA bands were found. This shows that a less diverse population was found in the presence of a high sulfide concentration.
Place, publisher, year, edition, pages
2008. Vol. 18, no 11, 1809-18 p.
IdentifiersURN: urn:nbn:se:umu:diva-20565PubMedID: 19047826OAI: oai:DiVA.org:umu-20565DiVA: diva2:208959