Changes in the Material Characteristics of Maize Straw during the Pretreatment Process of Methanation

Table 1

Basic characteristics of maize straw before and after ten-day pretreatment.

Pretreatment promoters		TS^a (%)	VS^b (%)	TOC^c (%)	TON^d (%)	C/N ratio
Raw material		79.50±0.42	89.20±0.31	36.95±0.28	0.56±0.02	66.31
After ten-day pretreatment	BA 1	11.07±1.33	92.33±0.45	33.00±0.43	0.54±0.00	61.05
	BA 2	11.83±0.21	91.65±0.64	33.78±0.41	0.72±0.05	46.68
	BA 3	13.67±0.23	90.36±0.37	34.69±0.55	0.68±0.05	50.90
	BA 4	14.31±0.37	89.64±0.27	32.50±0.30	0.70±0.03	46.53
	Urea	14.64±0.60	91.24±0.32	32.43±0.43	1.45±0.02	22.36
	Sodium hydroxide	20.00±0.30	44.63±0.45	15.03±0.24	0.25±0.02	60.25
	Biogas slurry	13.71±0.34	86.11±0.39	28.00±0.08	0.84±0.00	33.23
	Fresh water	11.53±0.55	93.19±0.38	33.37±0.54	0.59±0.01	56.26

^aTS: total solid.
^bVS: volatile solid, dry basis.
^cTOC: total organic carbon, dry basis.
^dTON: total organic nitrogen, dry basis.