Lignocellulosic agricultural waste types are the most used substrates and support materials in SSF [23]. However, other organic wastes have been recently used to create specific biochemical compositions as substrates to obtain a defined bioproduct. This is the typical case of glycolipid biosurfactants, for instance, where lipids are essential [24], whereas other materials can be produced from complex mixtures such as the organic fraction of municipal solid waste or digestate from biowaste [6,25]. Organic wastes are cheap and accessible resources that have a huge potential to be revalorized, and SSF can take advantage of these resources that have no other use. This poses some drawbacks because of the inherent characteristics of these wastes, such as their heterogeneity, complexity, and their changing nature.