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Anaerobic digestion of slaughterhouse waste in Sweden. Åke Nordberg JTI - Swedish Institute of Agricultural and Environmental Engineering. Anaerobic digestion of animal by-products: a sustainable treatment alternative. Biogas. Presentation out-line.

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anaerobic digestion of slaughterhouse waste in sweden

Anaerobic digestion of slaughterhouse waste in Sweden

Åke Nordberg

JTI - Swedish Institute of Agricultural and Environmental Engineering

slide2

Anaerobic digestion of animal by-products:

a sustainable treatment alternative

Biogas

presentation out line
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
pig slaughtering facility
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)

bovine slaughtering facility
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)

slide7

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).

potential value of gas and organic fertiliser from slaughterhouse
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

slaughterhouse waste in sweden legislation background
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
summary of capacity and treated waste in swedish biogas plants 2003
Summary of capacity and treated waste in Swedish biogas plants* 2003

*10 ABP-approved biogas plants (Major part treated in 7 plants)

concluding remarks
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