Number of cows and beef from each state were collected from
the USDA website [33]. Volume of manure and nutrient content
(N, P) in the manure were calculated for each of the state (detailed
calculations are in the SI). Bioenergy production for each state was
estimated using different scenarios. Duration of each cycle (residence
time) to complete all the processes for a scenario was
assumed to be 45 days. The major fraction of time in each cycle
was consumed by anaerobic digestion of dairy manure and residual
algal biomass. In each cycle, a constant amount of dairy manure
(accumulated during the previous cycle) was used for bioenergy