Research Article
Biological Pretreatment by Solid-State Fermentation of Oat Straw to Enhance Physical Quality of Pellets
Table 6
Optimization objectives of variables in the experimental pelleting of pretreated oat straw.
| | Variable | Goal | Level of importance |
| | Independent | | | | Fermentation time (d) | In range (21 to 35) | | | Moisture content (% mass fraction) | In range (60 to 70) | | | Particle size (mm) | In range (50 to 150) | | | Fermentation temperature (°C) | In range (21 to 34) | | | Response | | | | Density 0 (kg/m3) | Maximize | Fourth | | Density 1 (kg/m3) | Maximize | Third | | Dimensional stability (%) | Minimize | Second | | Tensile strength (MPa) | Maximize | First |
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