Anaerobic Digestion of the Organic Fraction of Municipal Solid Waste With Recirculation of Process Water

H. Hartmann, Irini Angelidaki, Birgitte Kiær Ahring

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


A new concept of a wet anaerobic digestion treatment of the organic fraction of municipal solid waste (OFMSW) is investigated. Once the waste is diluted with water, the entire liquid fraction of the effluent is recirculated and used as process water for dilution of the waste. This enables a well-mixed process without additional water supply. A methane yield of 400 and 445 ml/gVS from OFMSW was achieved in batch and reactor experiments, respectively. Reactor performance with 15 days retention time and an organic loading rate of 4.5 gVS/ld was stable with low VFA concentrations and a VS reduction of 70-80% when treating 100% OFMSW, diluted by 1:5. Recirculation of a larger fraction of the effluent makes removal of ammonia necessary in order to avoid inhibition of the process. The present process did not show degradation of the plasticizer DEHP (bis-2-ethylhexyl-phthalate) under thermophilic conditions after a period of 140 days.
Original languageEnglish
Title of host publication9th World Congress on Anaerobic Digestion
Publication date2001
Publication statusPublished - 2001
Event9th World Congress : Anaerobic Digestion - Antwerpen, Belgium
Duration: 2 Sep 20016 Sep 2001
Conference number: 9


Conference9th World Congress : Anaerobic Digestion


  • xenobiotics degradation
  • recirculation
  • process water
  • anaerobic digestion
  • organic fraction of municipal solid waste


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