Increasing the economic value of lignocellulosic stillage through medium-chain fatty acid production

Table 2 Composition of major organic matter components and aromatic compounds in the two batches of stillage fed to the mixed culture fermentation bioreactor

	Stillage batch 1	Stillage batch 2
Major stillage components (mg COD L⁻¹)
Soluble COD	95,400 ± 432	95,800 ± 982
Unknown COD	38,300 ± 3250	42,100 ± 3190
Xylose	20,800 ± 148	20,900 ± 168
Other carbohydrates	19,300 ± 2310	15,500 ± 2230
Acetamide	4030 ± 270	4200 ± 340
Glycerol	3900 ± 32.1	3920 ± 36.3
Acetic acid	2550 ± 21.1	2580 ± 20.5
Proteins	2200 ± 145	1910 ± 162
Ethanol	1220 ± 305	1590 ± 161
Aromatic compounds (μg COD L⁻¹)
Coumaroyl amide	13,000 ± 250	5400 ± 200
Feruloyl amide	12,000 ± 130	3200 ± 83
p-Coumaric acid	3500 ± 43	1100 ± 34
Benzoic acid	1700 ± 102	2000 ± 22
Vanillamide	290 ± 0.95	230 ± 0.50
4-Hydroxybenzoic acid	380 ± 15	320 ± 0.46
Vanillic acid	320 ± 0.09	370 ± 4.6
Ferulic acid	250 ± 13	90 ± 3.2
4-Hydroxybenzyl alcohol	240 ± 3.7	110 ± 1.9
Syringamide	230 ± 0.06	138 ± 2.3

Major stillage components are reported in mg COD L⁻¹ whereas aromatic compounds are reported in μg COD L⁻¹

ISSN: 2731-3654