title: Methane production from thermophilic co-digestion of dairy manure and waste milk obtained from therapeutically treated cows.
abstract: Methane production from co-digestion of dairy manure and waste milk, milk from cows treated with antibiotics for mastitis, was tested in a 2 × 4 factorial design. Four different waste milk percentages (w/w): 0% (SM), 10% (SMWM10), 20% (SMWM20) and 30% (SMWM30), were tested with two slurry percentages (w/w): 50% (A) and 25% (B) and the rest being manure at 55°C for 12 days in batch digesters. The results analyzed using a Gompertz model showed SMWM10 produced the highest methane production potential (Pm)/g volatile solids added followed by SM in both A and B. This Pmof SMWM10 in A and B was statistically non-significant (P > 0.05). More than 96% of cefazolin-resistant bacteria and 100% of multi-drug-resistant bacteria reductions were observed in all the treatments. Inclusion of waste milk at 10% in single stage digester enhances the methane production from dairy manure and could offer added benefit of waste milk treatment and disposal.
authors.affiliation: Department of Environmental Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.|Agricultural Biotechnology Center, Faculty of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka.
authors.forename: Nilmini
authors.initials: N
authors.lastname: Beneragama
authors.affiliation: Department of Environmental Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Iwasaki
authors.affiliation: Department of Environmental Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Umetsu
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001673:Biodegradation, Environmental; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy* / Q000378:metabolism*; D005260:Female; D006863:Hydrogen-Ion Concentration; D008372:Manure; D008413:Mastitis / Q000188:drug therapy / Q000378:metabolism* / Q000662:veterinary*; D017744:Medical Waste Disposal / Q000379:methods*; D008697:Methane; D008892:Milk; D013696:Temperature; D013997:Time Factors; D014866:Waste Products
chemical_list: D000900:Anti-Bacterial Agents; D008372:Manure; D017744:Medical Waste Disposal; D014866:Waste Products; D008697:Methane
keywords: cefazolin-resistant bacteria; co-digestion; dairy manure; methane; waste milk