Thermochemical processes are preferred over biochemical methods because of the advantages such as no pretreatment is required for the biomass in the hydrothermal carbonization process. Biochemical processes need pretreatment of biomass material by different pretreatment methods such as chemical, physical, biological and physiochemical to improve the accessibility of enzymes (Kumar, 2010). On the other hand, pretreatment is not needed for thermo-chemical methods.
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