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Title:
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ENHANCING BIOGAS PRODUCTION THROUGH CO-DIGESTION OF ANIMAL WASTE AND GRASS |
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Author(s):
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Ireen Maile, Edison Muzenda and Charles Mbohwa |
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ISBN:
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978-989-8533-73-9 |
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Editors:
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Theodora Issa, Tomayess Issa, Pedro Isaias and Ana Hol |
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Year:
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2017 |
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Edition:
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Single |
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Keywords:
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Anaerobic Digestion, Co-digestion, Optimum, Mesophilic, Thermophilic |
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Type:
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Full Paper |
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First Page:
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73 |
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Last Page:
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80 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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Biogas is a renewable source of energy that is produced by the anaerobic digestion (AD) of organic, biodegradable material. It is used in households for lighting, cooking and can be used also to produce electricity in combined heat and power (CHP) stations or upgraded to biomethane to be used as a vehicular fuel. The objective of the study was to optimise biogas production from cow dung (CD) through co-digestion with grass (G), chicken (CM) and pig (PM) manure. Substrate characterization was done and sample preparation prior to the process. Mesophilic (37ºC) and thermophilic (45ºC) temperatures were tested using the Automatic Methane Potential Test System (AMPTS II). Mono-digestion of cow dung at 37ºC yielded 620.10 Nml cumulative at 6.61 pH. Mono-digestion had the lowest yield of biogas produced. The optimum co-digestion mixture was CD: G: CM: PM at a feeding ratio of 1:1:1:3. Its cumulative biogas production at 37ºC and 45ºC was 2422.70 Nml, pH of 7.32 and 1663.70 Nml, pH of 7.5 respectively. Based on the results, temperature and pH play a significant role in biogas production. Anaerobic digestion at 37ºC performed better in terms of pH, stability and biogas production compared to the AD at 45ºC. Co-digestion improved biogas production by up to 74% overall. |
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