title: Biohydrogen and methane production via a two-step process using an acid pretreated native microalgae consortium.
abstract: A native microalgae consortium treated under thermal-acidic hydrolysis was used to produce hydrogen and methane in a two-step sequential process. Different acid concentrations were tested, generating hydrogen and methane yields of up to 45mLH2gVS-1and 432mLCH4gVS-1, respectively. The hydrogen production step solubilized the particulate COD (chemical oxygen demand) up to 30%, creating considerable amounts of volatile fatty acids (up to 10gCODL-1). It was observed that lower acid concentration presented higher hydrogen and methane production potential. The results revealed that thermal acid hydrolysis of a native microalgae consortium is a simple but effective strategy for producing hydrogen and methane in the sequential process. In addition to COD removal (50-70%), this method resulted in an energy recovery of up to 15.9kJ per g of volatile solids of microalgae biomass, one of the highest reported.
authors.affiliation: Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico.
authors.forename: Julian
authors.initials: J
authors.lastname: Carrillo-Reyes
authors.affiliation: Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico. Electronic address: gbuitronm@ii.unam.mx.
authors.forename: Germán
authors.initials: G
authors.lastname: Buitrón
mesh_terms: D000143:Acids / Q000494:pharmacology*; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005285:Fermentation / Q000187:drug effects; D006801:Humans; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis / Q000187:drug effects; D008697:Methane / Q000096:biosynthesis*; D058086:Microalgae / Q000187:drug effects / Q000378:metabolism*; D018505:Waste Management / Q000379:methods
chemical_list: D000143:Acids; D005232:Fatty Acids, Volatile; D006859:Hydrogen; D008697:Methane
keywords: Acidic hydrolysis; Consortium; Dark fermentation; Hydrogen; Methane; Microalgae