Anaerobic digestion of olive mill effluents: Microbiological and processing aspects

Vincenza Andreoni, Pierluigi Bonfanti, Daniele Daffonchio, Claudia Sorlini, Michela Villa

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Olive mill effluents have been treated by anaerobic digestion, using a laboratory scale, fixed bed, upflow digester. The process was conducted with two different retention times (2 and 1 days); organic load was increased up to 40 kg C0D/m3d. COD removal and biogas production were used as indicator of process efficiency. Counts of the main microbial groups involved in methanogenesis were determined to study microorganisms behaviour with different process conditions. The best COD removal (70-80%) was obtained with 2 days retention time and organic load of 5.5-9.5 kg COD/m3d. By working with an organic load of 40 kg COD/m3d at 1 day retention time, plant performances decreased but the process was not inhibited. Acidogenic and methanogenic bacteria significatively decreased, when the digester operated at high organic load.

Original languageEnglish (US)
Pages (from-to)2041-2059
Number of pages19
JournalJournal of Environmental Science and Health. Part A: Environmental Science and Engineering and Toxicology
Issue number9
StatePublished - Nov 1 1993
Externally publishedYes


  • Anaerobic digestion
  • methanogenic consortium
  • olive oil mill effluents (OME)

ASJC Scopus subject areas

  • Pollution


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