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The contribution of biogas plants to nutrient management planning

The contribution of biogas plants to nutrient management planning. Adviser Torkild Birkmose, DAAS, Denmark. Photo: Torben Skøtt, BioPress. Biogas. Biogas rests on tree legs. Energy. Agriculture. Environment. Agricultural advantages. Improved fertilizer value of nitrogen

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The contribution of biogas plants to nutrient management planning

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  1. The contribution of biogas plants to nutrient management planning Adviser Torkild Birkmose, DAAS, Denmark Photo: Torben Skøtt, BioPress

  2. Biogas Biogas rests on tree legs Energy Agriculture Environment

  3. Agricultural advantages • Improved fertilizer value of nitrogen • Balanced P and K-balance in slurry • Homogeneous and light fluid • Full declaration of nutrients • Free from germs and seeds • Reduced costs for transportation of slurry

  4. Environmental advantages • Reduced nitrate leaching • Reduced odour problems • Reduced green house gas emission • Controlled recycling of organic waste

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

  6. Fertilizer value

  7. Ammonia evaporation in spring barley 50 -N 4 40 30 -loss, % of spread NH 20 10 3 NH 0 2002 2003 Untreated pig slurry Digested pig slurry

  8. 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)

  9. 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, £ - - 34 17

  10. Digestion reduces risk of spreading diseases

  11. Digested slurry is low on germs 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

  12. Digestion reduces odour

  13. Reduction of odour compounds in the biogas reactor

  14. Concentration of VFA in slurry

  15. Carcass chamber for collecting air samples

  16. Odour concentration in air samples after spreading

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