Plug-flow hydrolysis with lignocellulosic residues: effect of hydraulic retention time and thin-sludge recirculation

Table 1 Average substrate characteristics of maize silage and bedding straw

Parameter	Unit	Maize silage		Bedding straw
Parameter	Unit	Ave	SD	Ave	SD
pH-value		4.64	1.07	7.63	0.72
TS	%	29.12	3.41	/	/
Moisture	%	70.88	3.41	/	/
VS	% of TS	96.85	0.70	83.54	8.38
Ashes	% of TS	3.15	0.70	20.36	13.06
tCOD	gO₂ g_TS⁻¹	0.85	0.03	0.50	0.27
sCOD	gO₂ g_TS⁻¹	0.13	0.03	0.06	0.02
Total nitrogen	% of TS	0.95	0.08	0.62	0.17
Non-structural carb. content	% of TS	31.60	8.68	12.77	4.72
Acid-insoluble lignin	% of TS	15.07	1.70	29.19	2.34
Acid-soluble lignin	% of TS	1.48	0.43	1.35	0.40

Characterization has been done for different substrate batches over time (see Additional file 1: Table S3)

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