Dansk Landbrugsrådgivning Landscentret The contribution of biogas plants to nutrient management planning Adviser Torkild Birkmose, DAAS, Denmark Photo:

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

Dansk Landbrugsrådgivning Landscentret Biogas rests on tree legs Biogas EnergyEnvironmentAgriculture

Dansk Landbrugsrådgivning Landscentret 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

Dansk Landbrugsrådgivning Landscentret Environmental advantages Reduced nitrate leaching Reduced odour problems Reduced green house gas emission Controlled recycling of organic waste

Dansk Landbrugsrådgivning Landscentret Mixing and digesting slurry change the characteristic of the slurry DM, % N-tot, kg/t NH 4 - N, kg/t P, kg/t K, kg/t pHNH 4 - N, % Digested slurry Pig slurry Cattle slurry 4,8 5,0 7,5 4,4 4,8 3,9 3,5 2,9 2,4 1,0 1,1 0,9 2,3 3,5 7,6 7,1 6,

Dansk Landbrugsrådgivning Landscentret Fertilizer value

Dansk Landbrugsrådgivning Landscentret Ammonia evaporation in spring barley NH 3 -loss, % of spread NH 4 -N Untreated pig slurryDigested pig slurry

Dansk Landbrugsrådgivning Landscentret Improved fertilizer effect of nitrogen - trials in winter wheat Cattle slurry, injected Pig slurry, injected Digested slurry, injected Cattle slurry, trailing hoses Pig slurry, trailing hoses Digested slurry, trailing hoses N-utilization, % (fertilizer equivalent)

Dansk Landbrugsrådgivning Landscentret Fertilizer plan for nitrogen for 1 ha grass 250 N-requirement, kg 170 N in slurry, kg total 6040N-utilization, % 10268N- in slurry, utilized, kg Saved, kg Saved, £ Mineral fertilizer Digested slurry Cattle slurryPer hectare

Dansk Landbrugsrådgivning Landscentret Digestion reduces risk of spreading diseases

Dansk Landbrugsrådgivning Landscentret Digested slurry is low on germs <5 1,300, , ,000 9,000,000 62,000 Mar. 18 May 13 July 15 Sept. 9 Nov. 11 AfterBeforeDate Test results from Ribe Biogas, bacteria per ml. slurry (1998) Log 10 germs per ml. slurry Time, weeks Slurry tank, 6-8°C Mesofile biogas, 35°C Thermofile biogas, 53°C

Dansk Landbrugsrådgivning Landscentret Digestion reduces odour

Dansk Landbrugsrådgivning Landscentret Reduction of odour compounds in the biogas reactor

Dansk Landbrugsrådgivning Landscentret Concentration of VFA in slurry

Dansk Landbrugsrådgivning Landscentret Carcass chamber for collecting air samples

Dansk Landbrugsrådgivning Landscentret Odour concentration in air samples after spreading

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