3.3. Methane yield of co-digestion of Pennisetum pururem cv. Pakchong 1 grass and layer chicken
manure
After start-up was achieved with Pennisetum pururem cv. Pakchong 1 grass and layer chicken manure.
The component ratio of Pennisetum pururem cv. Pakchong 1 grass and layer chicken manure was 50 : 50
% by weight to achieve C/N ratio of 20 and 70 : 30% by weight for C/N ratio of 30. Both of reactors were
used so that a comparison could be made between the duplicated system. The performance of the two
digesters, in terms of methane yield, was very comparable (Fig. 5) As shown in Table 2, the OLRs were
altered as difference proportions of co-digestate were used in the feed. The steady-state methane yield
obtained in this study were 0 .27