Orange Peels as Substrate for Biogas Plants

Alexander Jäger, Alexander Eder, Klaus Krennhuber, Sabine Podmirseg

Research output: Chapter in Book/Report/Conference proceedingsConference contribution


In the industrialised countries of Northern Europe, orange juice is increasingly produced locally as direct juice from imported oranges rather than from concentrate. This produces a large amount of orange peel waste. As part of the planning for the construction of a direct juice production facility in Austria, it was investigated whether this waste could be revalorized and used to generate energy in biogas plants. For this purpose, the biogas yield of pressed oranges was tested with various inocula in batch tests in accordance with the VDI 4630 standard. The biogas quantities and the biogas quality were compared with the reference substrate maize silage. The results of the tests allowed for the conclusion that orange peels are a suitable substrate for biogas plants, although gas yields are not reaching reference values. The co-fermentation of maize silage and orange peels, renders, however, reasonable yields. This approach does not only transform the "waste" orange peel into an energy source, but compared to composting or even dumping into landfills, there is also a considerable mitigation of CO2.
Original languageEnglish
Title of host publication4th International Conference of Food and Biosystems Engineering (FaBE 2019),
PublisherUniversity of Thessaly
Publication statusPublished - 2019
Event4th International Conference of Food and Biosystems Engineering (FaBE 2019) - Heraklion, Greece
Duration: 30 May 20192 Jun 2019


Workshop4th International Conference of Food and Biosystems Engineering (FaBE 2019)
Internet address


  • Food waste reduction
  • CO2 reduction
  • co-fermentation
  • anaerobic


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