title: Co-digestion of dairy cattle slurry and industrial meat-processing by-products--effect of ultrasound and hygienization pre-treatments.
abstract: Anaerobic co-digestion of a mixture of industrial animal by-products (ABP) from meat-processing in conjunction with dairy cattle slurry (mixed in a ratio of 1:3; w.w.) was evaluated at 35 °C focusing on methane production and stabilization. Three pre-treatments were applied (1) digestion with no pre-treatment (control), (2) ultrasound, and (3) thermal hygienization (70 °C, 60 min). Methane production potentials (MPP) of the untreated, ultrasound pre-treated and hygienized feed mixtures were 300, 340, and 360 m(3) CH(4)/t volatile solids (VS) added, as determined in the batch experiments. However, the specific methane productions (SMP) achieved in reactor experiments (hydraulic retention time HRT 21 d, organic loading rate OLR 3.0±0.1 kg VS/m(3) d) were 11±2% (untreated and ultrasound pre-treated) and 22±3% (hygienized) lower than the potentials. Ultrasound with the energy input of 1000 kJ/kg total solids (TS) and hygienization of the ready-made feed were the most suitable pre-treatment modes studied.
authors: University of Eastern Finland, Department of Environmental Science, Yliopistonranta I E, FI-70211 Kuopio, Finland. sami.luste@uef.fi
authors: Sami
authors: S
authors: Luste
authors: Helvi
authors: H
authors: Heinonen-Tanski
authors: Sari
authors: S
authors: Luostarinen
mesh_terms: D000003:Abattoirs; D000818:Animals; D019149:Bioreactors / Q000382:microbiology*; D002417:Cattle; D003611:Dairy Products / Q000382:microbiology*; D005511:Food Handling; D007220:Industrial Waste / Q000517:prevention & control; D008460:Meat / Q000382:microbiology*; D012037:Refuse Disposal / Q000379:methods; D012722:Sewage / Q000382:microbiology*; D013010:Sonication; D013242:Sterilization / Q000379:methods*
chemical_list: D007220:Industrial Waste; D012722:Sewage