2023/4/29/ · Organic waste, such as animal manure, is the most popular feedstock for biogas production (Abanades et al. 2021a, b; Damyanova and Beschkov 2020; Arshad et al. 2017). Animal manures are liquid, semisolid, and solid products from animals raised to produce meat, milk, eggs, and other agricultural products for human consumption.