The economic and environmental impact have started to be investigated, but more comprehensive studies are still required to evaluate the economic impact of such valorisations for breweries, their economic feasibility in a context of biorefinery, the environmental impact through LCA for example, as well as the comparison of above-mentioned criteria with different biomass valorisations. For an application as natural filler, the introduction of BSG often proved to be detrimental for the final material and the development of new strategies are required. In conclusion, to valorise large amounts of BSG, a combination of both polymer and composite material approaches could be ideal. A part of BSG's lignocellulosic biomass could be fractionated and valorised as polymeric matrix of high-performance, non-toxic or ecotoxic, biodegradable polymers, to which the rest of the biomass could be added as renewable filler. This strategy could help upcycle this waste biomass in larger amounts while using BSG as a whole in a biorefinery strategy without compromising its potential properties (physicochemical and water resistance). Such biorefineries have to be modelised to help providing high value products while targeting carbon neutrality throughout the valorisation process.