Optimization of the Alkaline Pretreatment of Rice Straw for Enhanced Methane Yield

Table 3

Changes in the main compositions of corn straw after chemical pretreatment (%).

	Control	4% Ca(OH)2			8% Ca(OH)2			12% Ca(OH)2
		3 d	7 d	11 d	3 d	7 d	11 d	3 d	7 d	11 d
Cellulose	45.36 ± 0.55	43.72 ± 0.86	40.98 ± 0.65	39.82 ± 1.00	37.29 ± 1.04	31.07 ± 0.49	29.74 ± 0.79	31.61 ± 1.13	22.14 ± 0.86	20.97 ± 0.58
Hemicellulose	28.14 ± 0.43	26.16 ± 1.02	22.51 ± 0.88	21.1 ± 0.91	19.81 ± 0.57	13.99 ± 1.14	11.54 ± 0.37	13.91 ± 0.39	11.24 ± 0.88	9.98 ± 0.64
Lignin	6.88 ± 0.09	6.58 ± 0.06	6.45 ± 0.10	6.23 ± 0.07	6.36 ± 0.03	6.22 ± 0.09	6.17 ± 0.04	6.39 ± 0.08	5.36 ± 0.15	5.21 ± 0.08

Result = mean ± SD.