Study of factors involved in the behavior of biofilms formed by biohydrogen-producing microflora identified by molecular biology using dairy wastewater |
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| Authors: | BA Ayil-Gutiérrez MC Tamayo-Ordoñez SY Silva Belmares TK Morales-Martínez JA Rodríguez-De la Garza MA Medina Morales AI Soria Ortiz B Gutiérrez Rodríguez LJ Ríos-González GJ Sosa Santillán IMM Moreno Dávila |
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| Affiliation: | 1. Department of Biotechnology, Faculty of Chemistry, Autonomous University of Coahuila, Mexico;2. Research Group of Chemist Pharmacologist, Faculty of Chemistry, Autonomous University of Coahuila, Mexico;3. Centro de Biotecnología Genómica – IPN, Reynosa, Tamaulipas, Mexico |
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| Abstract: | Batch tests were carried out to investigate the production of H2 considering the effects of: substrate concentration in a range of 3–25 g-COD/L; Initial pH: from 4 to 7 and 11 and temperatures of: 20, 35, 45 and 55 °C. The optimal substrate was 25 g-COD/L, with a reduction of COD of 73% and a yield of H2 of 5.95 mM/gCOD; and the optimal initial pH was 11.0, with a 70% of COD reduction and a H2 yield of 4236 mM/gCOD. The optimum temperature for pH = 11 was 35 °C, with a COD reduction of 69.8% and H2 yield of 6.3 mM/gCOD. Escherichia, Acinetobacter, Alcaligenes, Brevibacterium, Clostridium and Mycobacterium were isolated from pretreated inoculum samples and identified by 16S rDNA sequencing. The results suggest that biofilm reactors developed on a natural support such as Opuntia imbricata have good potential for hydrogen production from dairy wastewater. |
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| Keywords: | Diary wastewater Biohydrogen |
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