Abstract
There is growing public concern over potential impact on environmental quality caused by animal wastes. Anaerobic digestion, a biological conversion process can be used to obtain energy from biologicall wastes. This study explored the production of biogas from co-digestion of fonio hus and donkey dung using anaerobic biological conversion. The digesters were labeled as; digester A –Fonio husk only, digester B - donkey dung only, digester C – Fonio husk (300g) and Donkey Dung (200g), digester D – Fonio husk (200g) and donkey dung (300g). Proximate analysis of the substrates before and after digestion were determined such as total solids (TS), volatile solid, carbon content, nitrogen content, ash content, etc., and pH before and after digestion process. The biogas produced during this period was collected by water displacement method and subsequently measured. The results showed that Fonio husk in bio-digesters A and B gave a cumulative average biogas volume of 4972 ml and 5222 ml (week 3) while pig dung in bio-digesters C and D gave a cumulative average biogas volume of 5564 ml and 5978 respectively (week 3) within three weeks of fermentation. The digester is capable of producing 0.007m at average working temperature of 320C. Digester D produces higher volume of biogas as a result of improved nutrient provide by donkey dung as shown in the results obtained from the proximate analysis and has the best neutral pH, there was a reduction in the startup time. Â
Highlights
In Nigeria, agricultural waste generation is raising fast and creating humongous wastes disposal and management difficulties
The selection of the above-mentioned agricultural wastes is owing to the fact that such materials are readily available in abundance at North-West region of Nigeria the focus of this study is to investigate the production of biogas from fonio husk and donkey dung, as a potential alternative source of energy
Digester D produces higher volume of biogas compared to digester B. This was as the result of improved nutrient provided by donkey dung based on the result of the proximate analysis obtained before digestion
Summary
In Nigeria, agricultural waste generation is raising fast and creating humongous wastes disposal and management difficulties. The gases methane, hydrogen, and carbon monoxide (CO) can be burnt or oxidized with oxygen This energy release allows biogas to be used as a fuel; it can be used for any heating purpose, such as cooking. The utilization of fonio husk for the production of biogas was not very much studied Agricultural wastes such fonio husk and donkey dung can be transformed into valuable products via anaerobic digestion which provide vital substitute sources of energy for domestic use and small industrial scale. The selection of the above-mentioned agricultural wastes is owing to the fact that such materials are readily available in abundance at North-West region of Nigeria the focus of this study is to investigate the production of biogas from fonio husk and donkey dung, as a potential alternative source of energy. The objectives of the research were to investigate the effect of the nature of both fonio husk and donkey dung and their co-digestion, on biogas production yield
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