Table 1. Chemical characteristics of raw materials used in this study.

Substrate	a TS content/%	VS content/%	pH	Total carbon/g kg−1VS	Total Kjeldahl nitrogen/g kg−1VS	C/N
DM	15.8±0.34	81.5±1.41	7.26±0.03	65.8±1.19	2.96±0.05	22.2±0.22
CM	29.9±0.67	65.3±1.26	6.93±0.11	58.6±1.77	6.11±0.08	9.6±0.16
RS	89.2±1.59	92.3±1.34	-	328±5.67	6.34±0.11	51.7±1.62

^a±shows the standard error.