BIOGAS PRODUCTION FROM ANAEROBIC MONO AND CO DIGESTION OF POULTRY MANURE AND INVASIVE WEED SPECIES (Strigahermonthica)

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