title: Influence of headspace pressure on methane production in Biochemical Methane Potential (BMP) tests.
abstract: The biochemical methane potential test is the most commonly applied method to determine methane production from organic wastes. One of the parameters measured is the volume of biogas produced which can be determined manometrically by keeping the volume constant and measuring increases in pressure. In the present study, the effect of pressure accumulation in the headspace of the reactors has been studied. Triplicate batch trials employing cocoa shell, waste coffee grounds and dairy manure as substrates have been performed under two headspace pressure conditions. The results obtained in the study showed that headspace overpressures higher than 600mbar affected methane production for waste coffee grounds. On the contrary, headspace overpressures within a range of 600-1000mbar did not affect methane production for cocoa shell and dairy manure. With the analyses performed in the present work it has not been possible to determine the reasons for the lower methane yield value obtained for the waste coffee grounds under high headspace pressures.
authors.affiliation: Department of Water and Environmental Science and Technologies, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Valero
authors.affiliation: Department of Water and Environmental Science and Technologies, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain.
authors.forename: Jesús A
authors.initials: JA
authors.lastname: Montes
authors.affiliation: Department of Chemical and Process Engineering Resources, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Rico
authors.affiliation: Department of Water and Environmental Science and Technologies, University of Cantabria, Avda. Los Castros, s/n, 39005 Santander, Spain. Electronic address: ricoc@unican.es.
authors.forename: Carlos
authors.initials: C
authors.lastname: Rico
mesh_terms: D000818:Animals; D056804:Biofuels; D019149:Bioreactors; D002417:Cattle; D003069:Coffee; D003612:Dairying; D008372:Manure; D008697:Methane / Q000096:biosynthesis*; D011312:Pressure; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*; D014866:Waste Products
chemical_list: D056804:Biofuels; D003069:Coffee; D008372:Manure; D014866:Waste Products; D008697:Methane
keywords: BMP test; Cocoa shell; Dairy manure; Headspace pressure; Waste coffee grounds