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From crop residues to biogas

IS THE USE OF GRAIN MAIZE CROP RESIDUES AS INPUT TO AN ANAEROBIC DIGESTION PLANT A SUSTAINABLE OPTION?

An anaerobic digester is often fed with organic biological waste and agricultural streams (e.g. crop residues, silage maize). This produces biogas as the main product and digestate as a by-product. Crop residues can contribute an important part to this input. At present, crop residues from grain maize are not being harvested. Is it a sustainable option in Flanders to feed part of the anaerobic digestion plants with these crop residues?

SUSTAINABILITY ASSESSMENT VIA LCA

Life cycle analysis (LCA) is used to compare the environmental impact of the use of silage maize (S1: input = silage maize + other streams - case study 1) with the case study in which this silage maize is partly replaced by grain maize crop residues (S2: input = silage maize + crop residues grain maize + other streams - case study 2) as input from an anaerobic fermentation plant.

TRANSPORT IS ALSO VERY IMPORTANT...

  • OD: Ozone Depletion
  • POF: Photochemical Oxidant Formation
  • PMF: Particulate Matter Formation
  • CC: Climate Change
  • TA: Terrestrial Acidification
  • FE: Freshwater Eutrophication
  • ME: Marine Eutrophication

More information: lieselot.boone@ilvo.vlaanderen.be

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