Abstract:
Bio-fuel production from agricultural, municipal, and industrial wastes through anaerobic
digestion is meant for sustainable energy supply and eco-friendly waste management.
Therefore, the objective of this study was to determine biogas yield using Strigahermontica
as a solo substrate and co- digestion with poultry manure. The experimental analysis
revealed that there was variation among the pH values of the substrates before and after
anaerobic digestion. The mean pH value of the substrates before anaerobic digestion (AD)
was ranged from 6.88 to 7.75, whereas after AD it was ranged between 5.30 to 7.11. After
AD, pH values decreased in all the treatments. Moisture content (MC) was increased
significantly (P<0.05) between initial and after AD processes. The total solid content was
decreased after anaerobic digestion in all the treatments. The highest reduction (9.4%) in
total solid was observed in 50% Strigahermonthica (Sh): 50% poultry manure substrate
combination. In this study, the lowest volatile solid contents were observed in solo
substrate (poultry manure and striga) and the highest volatile solid content in mixed
substrate, especially in combination with 50% Sh: 50% PM. After anaerobic digestion,
volatile solid content was decreased in all the treatments as compared with before
anaerobic digestion. In this study, mixed substrates showed more initial organic carbon
content compared with solo substrates. The highest initial carbon content was observed in
combination with 50% Sh: 50% PM substrate. After anaerobic digestion, the carbon to
nitrogen ratio was decreased in all the treatments. Biogas production was measured for 21
days of AD. The cumulative biogas production was highly significantly (P<0.001) affected
by the substrate used as the feedstock. The maximum biogas (1043 ml) was produced by
the substrate with an equal proportion of Poultry manure and S.hermonthica feedstock’s
(50% Sh: 50% PM) while the lowest amount of biogas (579 ml) was produced solo
substrate (S.hermontica and poultry manure
