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Torben Ravn Pedersen National Specialist Biogas and Slurry Separation

Characteristics of anaerobic-digested manure Anaerobic digestion : A way to enhance nutritional performance of animal manure. Torben Ravn Pedersen National Specialist Biogas and Slurry Separation. Subejcts. Danish Agricultural Advisory Service Manure handling in Denmark Biogas in Denmark

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Torben Ravn Pedersen National Specialist Biogas and Slurry Separation

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  1. Characteristics of anaerobic-digested manureAnaerobicdigestion: A way to enhancenutritional performance of animal manure Torben Ravn Pedersen National Specialist Biogas and Slurry Separation

  2. Subejcts • Danish Agricultural Advisory Service • Manure handling in Denmark • Biogas in Denmark • Nutritient value in treated manure

  3. Danish Agricultural Advisory Service

  4. Manure types in Denmark

  5. How is slurry spread in Denmark?

  6. About 60 farmscale biogas plants in Denmark

  7. 20 centralized biogas plants

  8. Biogas Biogas rests on tree legs Energy Agriculture Environment

  9. Agricultural advantages • Improved fertilizer value of nitrogen • Balanced P and K-balance in slurry • Homogeneous and light fluid • Full declaration of nutrients • Bacteria-free and seedless • Reduced costs for transportation of slurry

  10. Environmental advantages • Reduced nitrate leaching • Reduced odour problems • Reduced green house gas emission • Controlled recycling of organic waste (turns waste into valuable fertilizer)

  11. Mixing and digesting slurry change the characteristic of the slurry

  12. Ammonia evaporation in spring barley 50 -N 40 30 -loss, % of spread NH4 20 10 NH3 0 2002 2003 Untreated pig slurry Digested pig slurry

  13. Improved fertilizer effect of nitrogen- trials in winter wheat Digested slurry, trailing hoses Pig slurry, trailing hoses Cattle slurry, trailing hoses Digested slurry, injected Pig slurry, injected Cattle slurry, injected 0 20 40 60 80 100 N-utilization, % (fertilizer equivalent)

  14. Fertilizer value

  15. Fertilizer plan for nitrogen for 1 ha grass Per hectare Cattle slurry Digested slurry N-requirement, kg 250 250 N in slurry, kg total 170 170 N-utilization, % 40 60 N- in slurry, utilized, kg 68 102 Mineral fertilizer 182 148 Saved, kg Saved, Euro - - 34 27

  16. N, P, and K in mineral fertilizer Prognosis

  17. N-application in Denmark 450 400 350 300 250 1,000 tonne of N per year 200 150 Fertilizer 100 Manure 50 0 1940 1950 1960 1970 1980 1990 2000 2010

  18. Injection in bare soil

  19. Injection of slurry in grass

  20. Digested slurry is low on bacteria 6 Test results from Ribe Biogas, bacteria per ml. slurry (1998) Log10 germs per ml. slurry 3 Date Before After Mar. 18 May 13 July 15 Sept. 9 Nov. 11 1,300,000 140,000 690,000 9,000,000 62,000 <5 <5 <5 <5 <5 5 10 Time, weeks Slurry tank, 6-8°C Mesofile biogas, 35°C Thermofile biogas, 53°C

  21. Digestion reduces odour

  22. Slurry separation –on treated manure Foto: Bigadan A/S. Foto: Westfalia

  23. Thank you for your attention!

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