Performance of a two-phase anaerobic digestion system when treating dairy wastewater

O. Ince*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

145 Citations (Scopus)


Performance of a laboratory-scale two-phase anaerobic digestion system treating dairy waste-water was investigated using the pre-determined operating criteria for the anaerobic acidification reactor. The results, obtained from a 9 month operation, showed that overall, 90% COD and 95% BOD removal efficiencies at an organic loading rate (OLR) of 5 kg COD/m3 d and a hydraulic retention time (HRT) of 2 days were achieved. The acidogenic phase completely stirred tank reactor was operated up to an OLR of 23 kg COD/m3 d with a HRT of 0.5 days whereas the methanogenic-phase upflow anaerobic filter was loaded up to an OLR of 7 kg COD/m3 d with a HRT of approximately 1.5 days. In the pre-acidification reactor, a maximum of 60% conversion rate of COD to volatile fatty acids (VFAs) was achieved at an OLR of 12 kg COD/m3 d after which the conversion rate remained reasonably constant while a 60% removal of total fatty matter was obtained. Good separation of acid and methane phases was achieved as indicated by low and high methane yields in the first and second phases respectively. VFAs produced during the acidogenic phase were effectively consumed in the methanogenic phase.

Original languageEnglish
Pages (from-to)2707-2713
Number of pages7
JournalWater Research
Issue number9
Publication statusPublished - Sept 1998


  • Acidification rate
  • Completely stirred anaerobic acidification reactor
  • Dairy wastewater
  • Total fatty matter removal
  • Two-phase anaerobic digestion
  • Upflow anaerobic filter


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