title: Optimization of biogas production from cattle manure by pre-treatment with ultrasound and co-digestion with crude glycerin.
abstract: Biogas production by co-digestion of cattle manure with crude glycerin obtained from biodiesel production was studied after pre-treatment of the cattle manure or mixtures of cattle manure with different amounts of added glycerin with ultrasound. Batch experiments with 1,750 mL of medium containing 1,760 g of screened cattle manure or mixtures of cattle manure (screened or ground) and 70-140 mL or crude glycerin were incubated under mesophilic and thermophilic condition in stirred tank reactors. Under mesophilic conditions, the addition of 4% glycerin to screened manure increased biogas production by up to 400%. Application of sonication (20 kHz, 0.1 kW, and 4 min) to a mixture of manure+4% glycerin increased production of biogas by up to 800% compared to untreated manure. The best results were obtained under thermophilic conditions using sonicated mixtures of ground cattle manure with 6% added glycerin (348 L methane/kg COD removed were obtained).
authors.affiliation: Chemical Engineering and Environmental Technology Department, University Technology Institute of Asturias (IUTA), University of Oviedo, Campus of Gijón, 33203 Gijón, Spain. cleonor@uniovi.es
authors.forename: L
authors.initials: L
authors.lastname: Castrillón
authors.forename: Y
authors.initials: Y
authors.lastname: Fernández-Nava
authors.forename: P
authors.initials: P
authors.lastname: Ormaechea
authors.forename: E
authors.initials: E
authors.lastname: Marañón
mesh_terms: D000818:Animals; D056804:Biofuels; D002417:Cattle; D005990:Glycerol / Q000378:metabolism*; D008372:Manure; D014465:Ultrasonics
chemical_list: D056804:Biofuels; D008372:Manure; D005990:Glycerol