ARTÍCULO
Competencia por sustrato durante el desarrollo de biomasa sulfato reductora a partir de un lodo metanogénico en un reactor UASB
Marisol Gallegos-García, Lourdes B. Celis, Elías Razo-Flores
En este trabajo se estudió la competencia entre microorganismos metanogénicos y
sulfatorreductores utilizando un reactor anaerobio de lecho de lodo granular con flujo
ascendente (UASB) a escala laboratorio, el cual fue usado para el enriquecimiento de
biomasa sulfatorreductora a partir de un lodo granular de origen metanogénico., 2010.
ABSTRACT:
microorganisms was studied using a laboratory scale up-flow anaerobic sludge blanket reactor (UASB), which was used for the enrichment of sulfate-reducing biomass from a methanogenic granular sludge. The reactor was fed with a mixture of ethanol and acetate and the organic loading rate was increased from 0.5 to 2 g chemical oxygen demand (COD)/L-d at pH of 7.0. The COD consumed was greater than 90 % and the alkalinity produced by the oxidation of the substrate increased the pH in the effluent up to 8.0. After 50 days of operation, the reactor was fed with lactate and sulfate to promote sulfate-reduction. The organic loading rate was increased from 1 to 3 g COD/L-d with a COD/sulfate ratio of 0.67 at a hydraulic retention time of one day. At 194 days of 22%, respectively. Total sulfide concentration reached 310 mg S2-/L and the sulfatereducing activity of the biomass was 0.29 g COD-H2S/g VSS-d, which demonstrated the development of sulfate reducing biomass. The methanogenic activity obtained was 0.35 g COD-CH4/g VSS-d, these results indicated that the methanogenic organisms were not displaced by the sulfate reducing bacteria, and both types of microorganisms coexisted in the anaerobic granular sludge at the end of reactor operation.