Biodegradability and methane productivity during anaerobic co-digestion of refractory leachate

M. Kawai*, M. Kishi, M. R. Hamersley, N. Nagao, J. Hermana, T. Toda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Mature landfill leachate was anaerobically co-digested with synthetic wastewater to evaluate the degradability and methane productivity in various mixing ratios. The proportion of leachate was increased in three equal steps from 0% to 100%, and then decreased again through the same steps back to 0%. Both COD removal efficiency and methane production decreased as the leachate proportion in the influent was increased. When the influent contained 100% leachate, and when 33% synthetic wastewater was reintroduced, methane production was suppressed relative to COD removal. During the same phases, NH4+ accumulated, suggesting an excess of NH4+ mineralization versus uptake. After 100% leachate was supplied, methane yield decreased to near zero, and the production of methane remained suppressed relative to COD reduction even as more synthetic wastewater was reintroduced, until 100% synthetic wastewater was resupplied. This decline in methane yield might be caused by deterioration of methanogenic bacterial activity following treatment of 100% leachate.

Original languageEnglish
Pages (from-to)46-51
Number of pages6
JournalInternational Biodeterioration and Biodegradation
Publication statusPublished - Aug 2012


  • Anaerobic co-digestion
  • Labile
  • Landfill leachate
  • Methane yield
  • Refractory organic matter


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