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Table 5 Multiple rounds of nRPS hydrolysis with cellulase recycling (20 FPU/g cellulose; 50% fresh enzymes)

From: Determinants on an efficient cellulase recycling process for the production of bioethanol from recycled paper sludge under high solid loadings

Round Glucose120 (g/L)a Ethanol23 (g/L)b Glucan conversion (%)
1 50.14 ± 0.55 25.86 ± 0.67 80.68 ± 0.44
2 (recycling 1) 41.86 ± 1.06 20.94 ± 0.85 70.55 ± 1.34
3 (recycling 2) 42.31 ± 0.76 21.39 ± 0.08 70.26 ± 0.13
4 (recycling 3) 40.74 ± 0.36 20.28 ± 0.15 70.18 ± 0.35
  1. Hydrolysis was conducted for 120 h (40 °C) followed 24 h of fermentation (35 °C)
  2. aGlucose produced at 120 h of hydrolysis
  3. bEthanol produced at 23 h of fermentation