Thermogravimetry and pyrolysis kinetic parameters analysis showed that the initial pyrolysis temperature and activation energies of biotreated samples were lower than those of the control sample, but there were no significant differences between coculture and monoculture of I. lacteus CD2. Biopretreatment could decrease the onset temperature of hemicellulose thermal degradation: hemicellulose plays a significant role in the structural integrity of cell walls by both covalent and non-covalent associations [40,41]. Biopretreatment can destruct the structural integrity by degrading
hemicellulose and make pyrolysis easier [5]. The pyrolysis results were related with the lignin degradation. As mentioned previously, the order of lignin degradation was: I. lacteus CD2 > co-culture > A. polytricha AP. The maximal weight loss was inversely proportional to lignin degradation ratio: I. lacteus CD2 < co-culture < A. polytricha AP < control. This is a very interesting phenomenon, and further study on mechanism is under investigation.