conditions was investigated. The daily
methane production rate of EFB, OPF and OPT was showed in
Fig. 1. The daily methane production rate was increasing dramatically
on day 10–29. OPF, EFB and OPT was reached maximum production
rate of 15.23, 12.43 and 10.26 m3 CH4 ton1 VS d1,
respectively at F:I ratio of 2:1. A first peak of methane production
on day 2–5 could correspond to the initial transformation of the