Biochemical methane potential (BMP) test for thickened sludge using anaerobic granular sludge at different inoculum/substrate ratios

Seung Joo Lim, Peter Fox

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The biochemical methane potential (BMP) test for thickened sludge was evaluated at three different inoculum/substrate (I:S) ratios. The cumulative methane yield was 51.4 mL CH4/g VSadded at an I:S ratio of 1:1, 76.3 mL CH4/g VSadded at an I:S ratio of 1:3, and 21.9 mL CH4/g VSadded at an I:S ratio of 1:8. The greatest ultimate methane yield and methane production rate constant were achieved at an I:S ratio of 1:3, whereas the least was obtained at an I:S ratio of 1:8. The maximum methane production rate constant was 0.38/day and the minimum methane production rate constant was 0.0016/day. For the case of a lower I:S ratio, the biomass activity may be affected due to the low substrate concentration. On the other hand, for the case of higher I:S ratios, anaerobic digestion of thickened sludge was inhibited by higher concentrations of volatile fatty acids and lower pH.

Original languageEnglish (US)
Pages (from-to)306-312
Number of pages7
JournalBiotechnology and Bioprocess Engineering
Volume18
Issue number2
DOIs
StatePublished - Apr 2013

Keywords

  • biochemical methane potential
  • inoculum/substrate ratio
  • methane yield
  • thickened sludge

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology
  • Biomedical Engineering

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