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Table 4 Experimental design used to investigate the pretreatment step

From: Introducing low-quality feedstocks in bioethanol production: efficient conversion of the lignocellulose fraction of animal bedding through steam pretreatment

Condition Temperature (°C) Residence time (min) pHa Coded units
1 200 10 3 1 1 1
2 200 10 2 1 1 − 1
3 200 5 3 1 -1 1
4 200 5 2 1 -1 − 1
5 190 10 3 − 1 1 1
6 190 10 2 − 1 1 − 1
7 190 5 3 − 1 − 1 1
8 190 5 2 − 1 − 1 − 1
9 195 7.5 1.6 0 0 − 1.8
10 195 7.5 3.4 0 0 1.8
11 195 3 2.5 0 − 1.8 0
12 195 12 2.5 0 1.8 0
13 186 7.5 2.5 − 1.8 0 0
14 204 7.5 2.5 1.8 0 0
15 195 7.5 2.5 0 0 0
16 195 7.5 2.5 0 0 0
17 195 7.5 2.5 0 0 0
18 195 7.5 2.5 0 0 0
  1. apH in the impregnation step