The biogas potential of Botswana, a cattle rich nation is explored using dung as a substrate. Biogas could be a good renewable and clean substitute for other forms of energy in rural Botswana, however, the technical and socio-economic potential remains largely unexploited. In this study, the cattle dung was characterized, followed by a lab-scale experiments on the biogas potential yields from the dung. The bio-digester design was selected using the multi criteria decision analysis. From the six digester models that were evaluated for selection, the KVIC was found to be the most suitable with its size ranging from 10 to 100 m3, The bio-digester was subsequently designed using data and mathematical models obtained from literature. The biogas plant was designed for Lemcke's cattle farm, the best selected site, with 5000 herds. The feedstock was found to have an in-situ density of 1410 kg/m3 with a total solids (TS) content of 18.9%, volatile solids (TS) content of 80%. The suitable digester size was found to be 20 m3, An energy audit showed that the plant had a potential to produce a surplus of 45.3 MWh of energy annually.
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机译：博茨瓦纳是一个养牛丰富的国家，其沼气潜力利用粪便作为底物进行了探索。沼气可以成为博茨瓦纳农村地区其他形式能源的良好可再生和清洁替代品，但是，技术和社会经济潜力仍未得到充分开发。在这项研究中，对牛粪进行了表征，然后对粪便中沼气的潜在产量进行了实验室规模的实验。使用多标准决策分析选择生物消化器设计。从六个经过评估选择的蒸煮器模型中，发现KVIC最适合，其尺寸范围为10至100 m
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，随后使用从文献中获得的数据和数学模型设计了生物消解器。该沼气厂是为Lemcke的养牛场设计的，这是最佳选择的地点，有5000只牛群。发现原料的原位密度为1410 kg / m3，总固体（TS）含量为18.9％，挥发性固体（TS）含量为80％。发现合适的沼气池大小为20立方米。一次能源审核显示，该工厂每年可能产生45.3兆瓦时的过剩能源。
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