Abstract
Cassava starch wastewater (CSW) generated from the starch extraction process can be utilized as a substrate for dark fermentation (DF), anaerobic digestion (AD), and two-stage systems (DF/AD), enabling the circular economy as it allows biofuels and biofertilizer recovery. In this context, hydrogen and biogas produced through DF/AD are considered promising substitutes for fossil fuels, which can contribute to the decarbonization of the energetic matrix. However, in spite of current advances in anaerobic technology, strategies to optimize the production and use of biogas by starch plants, including techno-economic aspects, still need to be explored toward the feasibility of biogas recovery on a full scale. Novel settings and operational conditions have been proposed for maximizing biogas production, while different energetic recovery methods have been assessed, such as bioelectricity and thermal energy generation or purification to biomethane. Therefore, in this chapter, the advances in the energetic valorization of CSW are discussed, as well as the techno-economic and environmental feasibility of hydrogen and biogas production via DF/AD.
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