Citric acid wastewater as electron donor for biological sulfate reductionReportar como inadecuado

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Applied Microbiology and Biotechnology

, Volume 83, Issue 5, pp 957–963

First Online: 28 April 2009Received: 04 March 2009Revised: 31 March 2009Accepted: 31 March 2009


Citrate-containing wastewater is used as electron donor for sulfate reduction in a biological treatment plant for the removal of sulfate. The pathway of citrate conversion coupled to sulfate reduction and the microorganisms involved were investigated. Citrate was not a direct electron donor for the sulfate-reducing bacteria. Instead, citrate was fermented to mainly acetate and formate. These fermentation products served as electron donors for the sulfate-reducing bacteria. Sulfate reduction activities of the reactor biomass with acetate and formate were sufficiently high to explain the sulfate reduction rates that are required for the process. Two citrate-fermenting bacteria were isolated. Strain R210 was closest related to Trichococcus pasteurii 99.5% ribosomal RNA rRNA gene sequence similarity. The closest relative of strain S101 was Veillonella montepellierensis with an rRNA gene sequence similarity of 96.7%. Both strains had a complementary substrate range.

KeywordsDesulfurization Sulfate reduction Citrate fermentation Trichococcus Veillonella  Download fulltext PDF

Autor: Alfons J. M. Stams - Jacco Huisman - Pedro A. Garcia Encina - Gerard Muyzer


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