Biological Pretreatment by Solid-State Fermentation of Oat Straw to Enhance Physical Quality of Pellets

Figure 4

SEM images of the outer surface of the untreated and treated oat straw (×2,000 times). (a) Untreated. (b) Treated with TV52J. (c) Treated with PC.

(a)

(b)

(c)