Autogenerative high pressure digestion: anaerobic digestion and biogas upgrading in a single step reactor system

R.E.F. Lindeboom, F.G. Fermoso, J. Weijma, K. Zagt, J.B. van Lier

Research output: Contribution to journalArticleAcademicpeer-review

49 Citations (Scopus)

Abstract

Conventional anaerobic digestion is a widely applied technology to produce biogas from organic wastes and residues. The biogas calorific value depends on the CH4 content which generally ranges between 55 and 65%. Biogas upgrading to so-called ‘green gas’, with natural gas quality, generally proceeds with add-on technologies, applicable only for biogas flows >100 m3/h. In the concept of autogenerative high pressure digestion (AHPD), methanogenic biomass builds up pressure inside the reactor. Since CO2 has a higher solubility than CH4, it will proportion more to the liquid phase at higher pressures. Therefore, AHPD biogas is characterised by a high CH4 content, reaching equilibrium values between 90 and 95% at a pressure of 3–90 bar. In addition, also H2S and NH3 are theoretically more soluble in the bulk liquid than CO2. Moreover, the water content of the already compressed biogas is calculated to have a dew point
Original languageEnglish
Pages (from-to)647-653
JournalWater Science and Technology
Volume64
Issue number3
DOIs
Publication statusPublished - 2011

Keywords

  • biogas
  • gas production
  • biochemical pathways
  • methane
  • anaerobic digestion
  • pressure treatment
  • carbon dioxide
  • solubility
  • anaerobic treatment
  • waste water treatment
  • biobased economy

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