Abstract
An anaerobic down-flow fluidized bed reactor was inoculated with granular sludge and started-up with sulfate containing synthetic wastewater to promote the formation of a biofilm enriched in sulfate-reducing bacteria (SRB), to produce biogenic sulfide. The start-up was done in two stages operating the reactor in batch for 45 days followed by 85 days of continuous operation. Low-density polyethylene was used as support. The biofilm formation was followed up by biochemical and electron microscopy analyses and the composition of the community was examined by 16S rDNA sequence analysis. Maximum immobilized volatile solids (1.2 g IVS/Lsupport) were obtained after 14 days in batch regime. During the 85 days of continuous operation, the reactor removed up to 80% of chemical oxygen demand (COD), up to 28% of the supplied sulfate and acetate was present in the effluent. Sulfate-reducing activity determined in the biofilm with ethanol or lactate as substrate was 11.7 and 15.3 g COD/g IVS per day, respectively. These results suggested the immobilization of sulfate reducers that incompletely oxidize the substrate to acetate; the phylogenetic analysis of the cloned 16S rDNA gene sequences showed high identity to the genus Desulfovibrio that oxidizes the substrates incompletely. In contrast, in the granular sludge used as inoculum a considerable number of clones showed homology to Methanobacterium and just few clones were close to SRB. The starting-up approach allowed the enrichment of SRB within the diverse community developed over the polyethylene support.
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Acknowledgments
This research was financially supported by the projects SEP-CONACyT-46506 and 62028. The authors acknowledge the technical assistance of Rosalba Castillo-Collazo, Dulce Partida-Gutierrez and Marisol Gallegos-Garcia. We also thank Dr. Mónica Meraz from the Department of Biotechnology at the Universidad Autónoma Metropolitana-Iztapalapa for her kind help with the design and construction of the DFFB reactor.
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Celis, L.B., Villa-Gómez, D., Alpuche-Solís, A.G. et al. Characterization of sulfate-reducing bacteria dominated surface communities during start-up of a down-flow fluidized bed reactor. J Ind Microbiol Biotechnol 36, 111–121 (2009). https://doi.org/10.1007/s10295-008-0478-7
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DOI: https://doi.org/10.1007/s10295-008-0478-7