Improving Anaerobic Digestion of Wheat Straw by Plasma-Assisted Pretreatment

Table 1

Methane yields, lignin content, and concentration of available sugars of raw and PAP wheat straw.

Treatment (layer)	Series name	VS load (gVS/L)	Yield (mL CH4/gVS)	Lignin (% of TS)^1	Total sugars (% of TS)^2
Raw material	RAW	10	254.04 ± 19.49	20.0	7.0
Single layer	SIN	10	317.04 ± 19.49	16.2	14.56
Top layer	TOP	10	286.05 ± 7.35	17.5	8.78
Mid layer	MID	10	300.97 ± 0.09	13	16.93
Bottom layer (low load)	BOT5	5	366.46 ± 9.36	7.2	28.43
Bottom layer (medium load)	BOT10	10	311.58 ± 10.45	7.2	28.43
Bottom layer (high load)	BOT20	20	277.96 ± 8.59	7.2	28.43

1Strong acid hydrolysis; ²enzymatic hydrolysis.