title: The influence of hydraulic residence time on the treatment of cattle manure in UASB reactors.
abstract: Cattle manure from farms in the autonomous community of Asturias, Spain, was characterised and subsequently treated, after filtration through a 1 mm sieve, in upflow anaerobic sludge blanket laboratory reactors. The volume generated per cow and day varied between 50-55 litres (obtained through a survey of 400 farms), the manure being used on Asturian farms up until now as a fertiliser. After screening, the COD of the manure employed varied between 33,000 and 56,000 mgO2 l(-1). The highest percentage of COD removal obtained was 75.5% for a hydraulic residence time of 22.5 days. Gas production varied between values of 0.20-0.39 m3gas kg(-1) COD removed, with a methane content of up to 64%. There was a fraction refractory to biodegradation of 11%.
authors.affiliation: Department of Chemical and Environmental Engineering, Higher School of Industrial Engineering, Gijón, University of Ovideo, Spain. emara@correo.uniovi.es
authors.forename: E
authors.initials: E
authors.lastname: Marañón
authors.forename: L
authors.initials: L
authors.lastname: Castrillón
authors.forename: I
authors.initials: I
authors.lastname: Vázquez
authors.forename: H
authors.initials: H
authors.lastname: Sastre
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002417:Cattle; D005374:Filtration; D005740:Gases / Q000032:analysis; D008372:Manure; D010100:Oxygen / Q000032:analysis / Q000378:metabolism; D012037:Refuse Disposal; D012722:Sewage; D014872:Water Movements
chemical_list: D005740:Gases; D008372:Manure; D012722:Sewage; D010100:Oxygen