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Digestate handling. Logistics of biomass for biogas. Co-substrates. P Surplus. Surplus of P in Danish agriculture. P Surplus. Plant Cattle Pig Mixed. What is this?. Typical composition of digestate. Birkmose et al. (2013). Biomasse til biogasanlæg i Danmark.

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surplus of p in danish agriculture

P Surplus

Surplus of P in Danish agriculture

P Surplus

Plant Cattle Pig Mixed

typical composition of digestate
Typical composition of digestate

Birkmose et al. (2013). Biomasse til biogasanlæg i


logistics of biomass for biogas1
Logistics of biomass for biogas



Solid fraction

value of digestate
Value of digestate

True value is lower because of: 1. Difficulties and costs during storage, 2. Uncertain availability of nutrients, 3. Administrative and legistrative problems, 4. Increased demand for catch crops, 5. Odour, 6. Supply and demand

Birkmose et al. (2013). Biomasse til biogasanlæg i


the goal
The goal




Feedstock (chemical composition)

Retention time





main environmental impacts associated with digestate handling
Main environmental impacts associated with digestate handling
  • NH3 emissions during storage and land application
  • Formation of the greenhouse gas N2O ad CO2 after land application
  • Nitrate leaching
  • Phosphorus loss
nh 3 volatilization
NH3 volatilization
  • High pH of digestate leads to high risk of ammonia volitilization
  • Covered storage
  • Low dry matter content leads to fast infiltration and therefore low ammonia volatilization
n 2 o emission
N2O emission
  • N2O is formed in two processes, nitrification and denitrification
  • Nitrification requires ammonia and oxygen
  • Defitrification require nitrate, organic matter and absense of oxygen