Substrate General Characteristics

A key point in fermentative processes is the Feedstock composition. It can be divided into two categories: biomass as inoculum or fresh inflow to the process. The inoculum is essential for a stable and productive process, since, if well-tailored, it provides the right amount of microorganisms to run the process (Rajput and Sheikh in Sustain Environ Res 29(1):4, 2019; Yarberry et al. in Waste Manag 87:62-70, 2019). Consequently, setting up a proper biomass is a crucial factor in a productive scenario. It is then necessary to understand and look for its best characteristics for the purpose.