Produced bioenergy in each scenario showed a gradual increase
till 3rd cycle and then decreased gradually and reached to a minimum
on 8th cycle (Fig. 2). The pattern aroused from the variation
in the number of cycles possible in different states of the US. In
most of the states, three cycles of bioenergy production was possible
hence, the maximum bioenergy production also occurred at
third cycle. Produced bioenergy for the four scenarios (1–4) did
not vary much. As compared to scenario 1, bioenergy production
in the 2nd scenario decreased by 9% in the initial cycles and then
increased by 16% in the later cycles [Table 2]. Further processing
of sludge through enzymatic hydrolysis (3rd scenario), increased
the overall bioenergy production by 6% during later cycle as compared
to 1st scenario. However, the overall bioenergy production in
the 3rd scenario (0.51 109 GJ/yr) decreased as compared to 1st
scenario (0.54 109 GJ/yr). In the fourth scenario, biomass left
after biomass liquefaction was further processed through pyrolysis.
In the fourth scenario, maximum increase in bioenergy production
by 31% was observed than that of 1st scenario. Compared to
the second scenario, increase in bioenergy production in the 4th