Kemausuor Francis, Addo Ahmad, Darkwah Lawrence
Department of Agricultural Engineering, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana ; The Energy Center, KNUST, Kumasi, Ghana.
The Energy Center, KNUST, Kumasi, Ghana ; Department of Chemical Engineering, KNUST, Kumasi, Ghana.
Biotechnol Res Int. 2015;2015:828576. doi: 10.1155/2015/828576. Epub 2015 Nov 18.
This study analyses technical potential and ex ante socioeconomic impacts of biogas production using cassava waste from agroprocessing plants. An analysis was performed for two biodigesters in two cassava processing communities in Ghana. The results showed that the two communities generate an excess of 4,500 tonnes of cassava peels per year. Using approximately 5% of the peels generated and livestock manure as inoculum can generate approximately 75,000 m(3) of gas with an estimated 60% methane content from two separate plants of capacities 500 m(3) and 300 m(3) in the two communities. If used internally as process fuel, the potential gas available could replace over 300 tonnes of firewood per year for cassava processing. The displacement of firewood with gas could have environmental, economic, and social benefits in creating sustainable development. With a 10 percent discount rate, an assumed 20-year biodigester will have a Net Present Value of approximately US$ 148,000, 7-year Payback Period, and an Internal Rate of Return of 18.7%. The project will create 10 full-time unskilled labour positions during the investment year and 4 positions during operation years.
本研究分析了利用农产品加工厂的木薯废料生产沼气的技术潜力和事前社会经济影响。对加纳两个木薯加工社区的两个沼气池进行了分析。结果表明，这两个社区每年产生超过4500吨木薯皮。使用所产生木薯皮的约5%以及牲畜粪便作为接种物，可从两个社区容量分别为500立方米和300立方米的独立工厂中产生约75000立方米的气体，估计甲烷含量为60%。如果在内部用作加工燃料，每年可用的潜在气体可替代超过300吨用于木薯加工的柴火。用气体替代柴火在创造可持续发展方面可带来环境、经济和社会效益。以10%的贴现率计算，假设使用20年的沼气池净现值约为148000美元，投资回收期为7年，内部收益率为18.7%。该项目在投资年将创造10个全职非技术劳动力岗位，运营年将创造4个岗位。
