title: Kinetic properties of a commercial and a native inoculum for aerobic milk fat degradation.
abstract: The aerobic fat biodegradation potential and growth characteristics of a commercial and a native inoculum (activated sludge from a dairy wastewater treatment pond), were evaluated. Batch tests were conducted with a medium based on butter oil, as the sole source of carbon, and mineral salts. Residual fat, biomass and CO(2) production were measured. Overall fat removal values were above 78% for both inocula. The growth kinetics of the commercial and native inocula followed Haldane and Monod models respectively. Both inocula showed a similar behaviour when butter oil concentration was under 360 mg/l; at higher values, the difference between the growth rates increased as a consequence of the inhibition exhibited by the commercial inoculum. The selection of an inoculum for bioaugmentation of bioreactors in the wastewater treatment requires a comprehensive knowledge of their degradation ability and tolerance to fluctuating compounds and of the operational conditions that will be utilized.
authors.affiliation: Departamento de Bioingeniería, Instituto de Ingeniería Química, Facultad de Ingeniería, Universidad de la República, J. Herrera y Reissig 565, 11300 Montevideo, Uruguay.
authors.forename: Lyliam
authors.initials: L
authors.lastname: Loperena
authors.forename: Verónica
authors.initials: V
authors.lastname: Saravia
authors.forename: Daiman
authors.initials: D
authors.lastname: Murro
authors.forename: Mario Daniel
authors.initials: MD
authors.lastname: Ferrari
authors.forename: Claudia
authors.initials: C
authors.lastname: Lareo
mesh_terms: D000818:Animals; D001420:Bacteria, Aerobic / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis; D003612:Dairying / Q000379:methods; D005223:Fats / Q000378:metabolism*; D008892:Milk / Q000737:chemistry*; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D005223:Fats; D012722:Sewage; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide