Catering wastes

Catering wastes are the organic waste material from preparation of the meals, such as potatoe peels, or leftover from the prepared meals.


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 Biomass NameDry matter (DM) content, %Total nitrogen (N), kg per tonNH4-N, kg per tonTotal phosphorus (calculated as pure P) , kg per tonPotassium (calculated as pure K) , kg per tonOrganic matter, % of DMMagnesium (Mg), kg per tonCalcium (Ca), kg per tonSodium (Na), kg per tonCupper (Cu), gram per tonZinc (Zn), gram per tonVS % DM (Volitile Solids)m3 CH4 Pr Ton VSCO2e reduc. ton pr ton VSPrice pr. ton (€)Reference
Shredded waste26,0          92,00552,000,69 1

Used units are:

  • Ton for amount
  • % for dry matter (DM)
  • % of DM for organic matter and VS
  • kg per ton for macro elements (N, NH4-N, P, K, organic C, Mg, Ca and Na)
  • gram per ton for trace elements (Cu and Zn)

The shown values are to be considered as examples, alone, that illustrates the chemical composition for relevant parametres, and as well the variation in the composition. The references must be consulted in each case in order to clarify for instance the analysis method.


Where no other references are made, the source for the CO2 reduction coefficient (CO2e reduc. ton pr ton VS) is: Sven G. Sommer, Henrik B. Møller og Søren O. Pedersen. 2001. Reduktion af drivhusgasemission fra gylle og organisk affald ved biogasbehandling (In English: Reduction of green house gas emission from slurry and organic wastes by biogas treatment). Report No. 31 - Animal Production, from DJF (In English: Danish Institute of Agricultural Sciences). 53 pp., Appendix 3, Biogas scenario 2, without subsstitution efffect.

Other references are incicated by: 'Reference number: Reference; Comment'

  • 1: The data source is "Fact sheet for biogas" developed by NIRAS for in 2012. Aarhus University has validated the data and also provided information about volatile solids and gas potential of the biomasses. The original data can be downloaded from; The biogas potential is based on either a mesophilic process (38°C) with 25 days retention time, or thermophilic process (53°C) with 17 days retention time and 10 days in storage tank (10% biogas collected in covered after storage tank).