“…Feedstock availability and quality have been challenging for biogas digesters, especially in large-scale biogas systems where large quantities of feedstock are required for digestion. Feedstock such as kitchen waste, night soil, and dairy manure has been used as the primary feedstock with digesters designed specially to digest them [ [64] , [65] , [66] , [67] , [68] , [69] , [70] , [71] , [72] , [73] , [74] ]. Feedstock choice as a cardinal factor in the design is emphasized in many studies that have prioritized it.…”