title: Biohydrogen production from Tequila vinasses in an anaerobic sequencing batch reactor: effect of initial substrate concentration, temperature and hydraulic retention time.
abstract: The effect of the temperature (25 and 35 degrees C), the hydraulic retention time, HRT, (12 and 24 h) and initial substrate concentration on hydrogen production from Tequila vinasse was studied using a sequencing batch reactor. When 25 degrees C and 12-h HRT were applied, only insignificant biogas quantities were produced; however, using 24 h of HRT and temperatures of 25 and 35 degrees C, biogas containing hydrogen was produced. A maximum volumetric hydrogen production rate of 50.5 mL H(2) L(-1) h(-1) (48 mmol H(2) L(reactor)(-1) d(-1)) and an average hydrogen content in the biogas of 29.2+/-8.8% were obtained when the reactor was fed with 3 g COD L(-1), at 35 degrees C and 12-h HRT. Methane formation was observed when the longer HRT was applied. Results demonstrated the feasibility to produce hydrogen from this waste without a previous pre-treatment.
authors.affiliation: Laboratory for Research on Advanced Processes for Water Treatment, Instituto de Ingeniería, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico. GBuitronM@iingen.unam.mx
authors.forename: Germán
authors.initials: G
authors.lastname: Buitrón
authors.forename: Carolina
authors.initials: C
authors.lastname: Carvajal
mesh_terms: D000693:Anaerobiosis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D001628:Beverages / Q000032:analysis* / Q000382:microbiology; D056804:Biofuels / Q000032:analysis* / Q000382:microbiology; D019149:Bioreactors / Q000382:microbiology*; D001709:Biotechnology / Q000379:methods*; D002244:Carbon / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation / Q000187:drug effects; D005947:Glucose / Q000494:pharmacology; D006859:Hydrogen / Q000378:metabolism*; D007700:Kinetics; D008956:Models, Chemical; D012995:Solubility / Q000187:drug effects; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D014866:Waste Products / Q000032:analysis*
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D012997:Solvents; D014866:Waste Products; D002244:Carbon; D006859:Hydrogen; D005947:Glucose