Enhancing Biogas Yield by Co-Digestion of Cattle Dung and Acha (Digitaria Exilis) Hulls


Authors : Orkuma J.G; Samuel, D.A; Eziefula B.I; Okoro, O.M

Volume/Issue : Volume 9 - 2024, Issue 12 - December

Google Scholar : https://tinyurl.com/bdd3v8tn

Scribd : https://tinyurl.com/yscrw7ku

DOI : https://doi.org/10.5281/zenodo.14603613

Abstract : This study assessed biogas yield enhancement by the co-digestion of Cattle Dung (CD) and acha (Digitaria exilis) hulls (AH) due the perceived synergy of these wastes to improve biomethane yield. Ultimate properties of the CD and AH useful for biogas process stability were evaluated. Triplicate experiments were conducted in 1000 mL polyethylene biodigester at the organic loading rates (OLR) of 4, 6 and 8 g VS/L and inoculum to substrate ratio of 2:1 in Biodigesters A, B, C and control at ambient temperature. Response Surface Methodology’s was used to assess the effect of process parameters on cumulative biogas yield (CBY). The results show that the average composition (%) of total solids, volatile solids, N and C were 82.43, 64.86, 3.18 and 37.62 respectively for CD and 92.61, 85.22, 1.68, and 49.43 respectively for AH. The C:N ratio was 12:1 for CD, 29.58:1 for AH and averaged 20.79:1. Biodigester B (663.42mL) with 4 g VS/L recorded the highest biogas volume, followed by A (581.95mL) and then the control (489.77). Biodigester C (475.60mL) had the least volume. ANOVA showed that OLR (F = 62.49, p < 0.01) and time (F = 89.01, p < 0.01) were significant predictors of CBY but ambient temperature was not. The optimization prediction shows that cumulative biogas volume of 507.63 mL can be attained when the biodigester is operated at 4 g VS/L at 33 °C, over 34 days. This result supports the notion that codigestion increases biogas yields.

Keywords : Biogas - Anaerobic Codigestion -Cattle Dung - Acha Hull.

References :

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This study assessed biogas yield enhancement by the co-digestion of Cattle Dung (CD) and acha (Digitaria exilis) hulls (AH) due the perceived synergy of these wastes to improve biomethane yield. Ultimate properties of the CD and AH useful for biogas process stability were evaluated. Triplicate experiments were conducted in 1000 mL polyethylene biodigester at the organic loading rates (OLR) of 4, 6 and 8 g VS/L and inoculum to substrate ratio of 2:1 in Biodigesters A, B, C and control at ambient temperature. Response Surface Methodology’s was used to assess the effect of process parameters on cumulative biogas yield (CBY). The results show that the average composition (%) of total solids, volatile solids, N and C were 82.43, 64.86, 3.18 and 37.62 respectively for CD and 92.61, 85.22, 1.68, and 49.43 respectively for AH. The C:N ratio was 12:1 for CD, 29.58:1 for AH and averaged 20.79:1. Biodigester B (663.42mL) with 4 g VS/L recorded the highest biogas volume, followed by A (581.95mL) and then the control (489.77). Biodigester C (475.60mL) had the least volume. ANOVA showed that OLR (F = 62.49, p < 0.01) and time (F = 89.01, p < 0.01) were significant predictors of CBY but ambient temperature was not. The optimization prediction shows that cumulative biogas volume of 507.63 mL can be attained when the biodigester is operated at 4 g VS/L at 33 °C, over 34 days. This result supports the notion that codigestion increases biogas yields.

Keywords : Biogas - Anaerobic Codigestion -Cattle Dung - Acha Hull.

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