title: Use of coffee mucilage as a new substrate for hydrogen production in anaerobic co-digestion with swine manure.
abstract: Coffee mucilage (CM), a novel substrate produced as waste from agricultural activity in Colombia, the largest fourth coffee producer in the world, was used for hydrogen production. The study evaluated three ratios (C1-3) for co-digestion of CM and swine manure (SM), and an increase in organic load to improve hydrogen production (C4). The hydrogen production was improved by a C/N ratio of 53.4 used in C2 and C4. The average hydrogen production rate in C4 was 7.6 NL H2/LCMd, which indicates a high hydrogen potential compare to substrates such as POME and wheat starch. In this condition, the biogas composition was 0.1%, 50.6% and 39.0% of methane, carbon dioxide and hydrogen, respectively. The butyric and acetic fermentation pathways were the main routes identified during hydrogen production which kept a Bu/Ac ratio at around 1.0. A direct relationship between coffee mucilage, biogas and cumulative hydrogen volume was established.
authors.affiliation: Environmental Engineering Research Center, Universidad de los Andes, Bogotá, Colombia; Ecole des Mines de Nantes, GEPEA UMR CNRS 6144, Nantes, France. Electronic address: mario-h1@uniandes.edu.co.
authors.forename: Mario Andrés
authors.initials: MA
authors.lastname: Hernández
authors.affiliation: Environmental Engineering Research Center, Universidad de los Andes, Bogotá, Colombia.
authors.forename: Manuel
authors.initials: M
authors.lastname: Rodríguez Susa
authors.affiliation: Ecole des Mines de Nantes, GEPEA UMR CNRS 6144, Nantes, France.
authors.forename: Yves
authors.initials: Y
authors.lastname: Andres
mesh_terms: D000468:Alkalies / Q000737:chemistry; D000693:Anaerobiosis; D000818:Animals; D061249:Batch Cell Culture Techniques; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D003069:Coffee / Q000737:chemistry*; D003624:Darkness; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008372:Manure; D062087:Plant Mucilage / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D012995:Solubility; D013552:Swine
chemical_list: D000468:Alkalies; D056804:Biofuels; D003069:Coffee; D005232:Fatty Acids, Volatile; D008372:Manure; D062087:Plant Mucilage; D006859:Hydrogen
keywords: Biohydrogen; C/N ratio; Co-digestion; Coffee mucilage; Repetitive batch cultivation