title: Effect of the generation and physical-chemical characterization of swine and dairy cattle slurries on treatment technologies.
abstract: Differences in biodegradability can affect the treatment of slurry before its use in spraying. The objective of this study was to evaluate the effect of the generation and physical-chemical characterization of swine and dairy cattle slurries on different biological treatment technologies. This research involved monthly sampling (number/composition) for 1 year of 24 swine farms (16%), cattle farms (38%), and mixed swine and cattle farms (46%). The results obtained showed differences in feeding (3 l water kg(-1) food for cattle and 5 l water kg(-1) food for swine) and assimilation (0.6 kg food kg (-1) milk produced and 3 kg kg(-1) weight gain), which may influence the generation of slurry (57 l animal(-1)d(-1) in cattle and 31 l animal(-1) d(-1) in swine) and its composition. In addition, the composition of swine slurry [23 g chemical oxygen demand (COD) l(-1), 3 g total nitrogen (TN) l(-1)] is significantly different (P < 0.01) to cattle slurry (4 g COD l(-1), 0.3 g TN l(-1)). Finally, the composition and the S index applied to swine slurry [COD N(-1) = 8, biological oxygen demand (BOD)5 COD(-1) = 0.3, S index > 0] and cattle slurry (COD N(-1) = 16, BOD5 COD(-1) = 0.6, S index < 0) show a difference on the biodegradability of both slurries. Suitability of anaerobic and aerobic treatment was assessed based on the findings.
authors.affiliation: EnvironmentalScience Center EULA-Chile, University of Concepción, Concepción, Chile. cvillamar@udec.cl
authors.forename: Cristina-Alejandra
authors.initials: CA
authors.lastname: Villamar
authors.forename: Diana-Catalina
authors.initials: DC
authors.lastname: Rodríguez
authors.forename: Daniela
authors.initials: D
authors.lastname: López
authors.forename: Gustavo
authors.initials: G
authors.lastname: Peñuela
authors.forename: Gladys
authors.initials: G
authors.lastname: Vidal
mesh_terms: D000818:Animals; D057919:Biological Oxygen Demand Analysis; D002417:Cattle; D008372:Manure; D009584:Nitrogen / Q000032:analysis; D013552:Swine
chemical_list: D008372:Manure; D009584:Nitrogen
keywords: Aerobic treatment; S index; anaerobic treatment; dairy cattle; swine