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Anaerobic digestion of slaughterhouse waste in Sweden

Anaerobic digestion of slaughterhouse waste in Sweden

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Anaerobic digestion of slaughterhouse waste in Sweden

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  1. Anaerobic digestion of slaughterhouse waste in Sweden Åke Nordberg JTI - Swedish Institute of Agricultural and Environmental Engineering

  2. Anaerobic digestion of animal by-products: a sustainable treatment alternative Biogas

  3. Presentation out-line • Regulations for anaerobic digestion (AD) of animal by-products (ABP) • Potential biogas substrates from slaughtered animals • AD of slaughterhouse waste in Sweden

  4. Regulation (EC) No 1774/2002, applicablefrom 1st of May 2003 in all member states

  5. Pig slaughtering facility Manure Cat. 2 – no required treatment Anaerobic Digester (According to article 15) Digestive tract content Digestive tract Cat. 3 - pasteurisation Pasteurisation <12 mm ≥60 min ≥70 °C Bones, slaughter by-products Parts of slaughtered animals Blood Sterilisation ≥ 133 °C ≥ 3 bar ≥ 20 min Cat. 2 - sterilisation Fallen animals Screenings and flotation sludge >6 mm (< 6 mm not covered by ABP-regulation) End product Salmonella: 0 CFU in 25 g (5 samples) Enterobacteriaceae: 3 samples < 10 CFU/g, 2 samples < 300 CFU/g Placing on the market, trade, application to land (not pasture)

  6. Bovine slaughtering facility Manure Cat. 2 – no required treatment Anaerobic Digester (According to article 15) Rumen content Rumen Cat. 3 - pasteurisation Pasteurisation <12 mm ≥60 min ≥70 °C Bones, slaughter by-products Parts of slaughtered animals Blood* (no SRM in blood stream) SRM; vertebral column and skull, intestines Sterilisation/ Incineration Not intended for AD Cat. 1 Screenings and flotation sludge >6 mm End product Salmonella: 0 CFU in 25 g (5 samples) Enterobacteriaceae: 3 samples < 10 CFU/g, 2 samples < 300 CFU/g Placing on the market, trade, application to land (not pasture) (< 6 mm not covered by ABP-regulation)

  7. Calculated methane potential from slaughter of cattle and pigs divided into different waste categories(% of total methane potential) and the total amount(MJ or kWh per animal).

  8. Potential value of gas and organic fertiliser from slaughterhouse Raw biogas: 3.3 Eurocent/kWh N: 0.76 Euro/kg P: 1.20 Euro/kg K: 0.33 Euro/kg

  9. Slaughterhouse waste in Sweden-legislation background • 1988 (SFS 1988:537) • Meat meal from carcasses not allowed in animal fodder • 1991 (LSFS 1990:51) • Use of low-risk animal by-products in ruminant fodder prohibited in 1991

  10. Existing biogas plants approved for ABP co-digestion Luleå Skövde Borås

  11. Swedish co-digestion plants treating animal by-products

  12. Summary of capacity and treated waste in Swedish biogas plants* 2003 *10 ABP-approved biogas plants (Major part treated in 7 plants)

  13. Concluding remarks • Animal by-products are suitable for anaerobic digestion giving high gas yields and a nutrient rich organic fertilizer • AD of slaughterhouse waste within the legislative framework 1774/2002 offers a safe and sustainable waste management solution • Governmental subsidies for facilitating investments in AD of slaughterhouse waste is well invested money from a sustainable point of view