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San Lorenzo de Esmeraldas, Ecuador

Garcia-Solares S.M.,National Polytechnic Institute of Mexico | Ordaz A.,Luis Vargas Torres Technical University | Monroy-Hermosillo O.,Metropolitan Autonomous University | Jan-Roblero J.,National Polytechnic Institute of Mexico | Guerrero-Barajas C.,National Polytechnic Institute of Mexico
Applied Biochemistry and Biotechnology | Year: 2014

Sulfidogenesis in reactors is mostly achieved through adaptation of predominantly methanogenic granular sludge to sulfidogenesis. In this work, an upflow anaerobic sludge blanket (UASB) reactor operated under sulfate-reducing conditions was inoculated with hydrothermal vent sediments to carry out sulfate reduction using volatile fatty acids (VFAs) as substrate and chemical oxygen demand (COD)/SO4 −2 ratios between 0.49 and 0.64. After a short period of adaptation, a robust non-granular sludge was capable of achieving high sulfate reduction efficiencies while avoiding competence with methanogens and toxicity to the microorganisms due to high sulfide concentration. The highest sulfide concentration (2,552 mg/L) was obtained with acetate/butyrate, and sulfate reduction efficiencies were up to 98 %. A mixture of acetate/butyrate, which produced a higher yielding of HS−, was preferred over acetate/propionate/butyrate since the consumption of COD was minimized during the process. Sludge was analyzed, and some of the microorganisms identified in the sludge belong to the genera Desulfobacterium, Marinobacter, and Clostridium. The tolerance of the sludge to sulfide may be attributed to the syntrophy among these microorganisms, some of which have been reported to tolerate high concentrations of sulfide. To the best of our knowledge, this is the first report on the analysis of the direct utilization of hydrothermal vent sediments as an alternate source of sludge for sulfate reduction under high sulfide concentrations. © 2014, Springer Science+Business Media New York. Source


Luis Vargas Torres Technical University | Entity website


Luis Vargas Torres Technical University | Entity website

Aula Virtual UTELVT - Extensin La Concordia


Luis Vargas Torres Technical University | Entity website


Luis Vargas Torres Technical University | Entity website

AUTORIDADES abril 13, 2015  Para ver el perfil acadmico solo dele clic en la foto

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