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Table 3 Ethanol concentrations and ethanol yields during SSF and PSSF of steam-pretreated wheat straw

From: Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

T (°C) WIS (%) Fermentation mode Duration of experiment (h)a Ethanol conc (g/L) Ethanol yield (%) in the fermentationb Ethanol g/100 g dry straw
190 10 SSF 96 23.4 68 12.6
200 30.5 85 16.2
210 31.4 87 15.5
200 12.5 SSF 96 39.6 86 16.3
PSSF 24 + 72 34.0 74 14.0
15 SSF 96 48.3 85 16.1
PSSF 24 + 72 44.8 79 15.0
17.5 SSF 96 57.2 83 15.9
PSSF 24 + 72 52.9 78 14.7
20 SSF 192c 67.3 83 15.9
PSSF 24 + 72 59.0 74 13.9
  1. Ethanol yields are expressed as % of theoretical and g ethanol produced per 100 g of dry straw. The maximum amount of ethanol that could be produced from 100 g dry straw is 18.5 g
  2. aDuration of prehydrolysis + duration of SSF
  3. b% of theoretical, based on the glucan content in the pretreated solids
  4. cDue to mixing difficulties, the SSF at 20 % WIS was run for 192 h