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首页> 外文期刊>International journal of low carbon technologies >Feasibility study of biogas energy generation from refuse dump in a community-based distribution in Nigeria
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Feasibility study of biogas energy generation from refuse dump in a community-based distribution in Nigeria

机译：在尼日利亚以社区为基础的分布中的垃圾场产生沼气能源的可行性研究

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Energy generation remains one of the biggest challenges of developing nations like Nigeria. The World Bank estimated that ~80 million (44.4%) out of 180 million Nigerians living in 8000 villages across the country lack access to electricity. Lack of access to electricity to stimulate small- and medium-scale enterprises in rural communities is believed to be a major factor responsible for rural—urban migration and the lingering emigration crises across the globe. In this study, three different wastes generated were combined in a locally fabricated digester and each singly loaded in respective digesters to generate energy in the form of biogas with an anticipation of redistribution for a community-based use. The biodegradability test of the substrates were studied ab initio by evaluating for ash and moisture contents, C/N ratio, biochemical oxygen demand (BOD) and chemical oxygen demand (COD) for maize chaff, watermelon and cassava peels. The results showed 2.85, 0.66 and 2.40% for ash content, 11.18, 93.22 and 70.26% for moisture content, 12.10, 15.10 and 19.10% for C/N ratio, 155.07, 131.96 and 113.79 ppm for BOD, and 240.00, 212.00 and 264.00 ppm for the substrates, respectively. From the results, maize chaff with the highest ash content has the least biodegradable (organic) matter, while watermelon, with the least ash content, has the highest biodegradable matter. The moisture content results for maize chaff and watermelon were below and above the optimum value of ‘60–80%’ and this confirmed the low biogas volume produced when used alone. The ideal C/N ratio for anaerobic digestion is between ‘20:1 and 30:1’. A comparison of these sets of values from the study showed that the C/N ratios obtained from the research work are below the optimum values of the C/N ratios and could be responsible for the poor biogas yield for the disjoined substrates. The biogas volume of 2100 ml was produced at the end of the retention time for the combined substrates and, was higher compared with the 18, 25 and 29 ml produced for maize chaff, watermelon and cassava peels, (the disjoined) substrates, respectively. In this study, the COD value for each substrate is higher than the corresponding BOD values. Hence, co-digestion of unavoidable food wastes is economic and, a potentially viable option to generate alternative renewable energy for rural community-based use.
机译：能源生产仍然是尼日利亚等发展中国家的最大挑战之一。世界银行估计，生活在全国8000个村庄中的1.8亿尼日利亚人中，约有8000万（44.4％）没有电。人们认为，缺乏电力来刺激农村社区的中小型企业是造成农村人口向城市迁移以及全球范围内持久的移民危机的主要原因。在这项研究中，产生的三种不同废物在一个本地制造的沼气池中合并在一起，每种分别装入各自的沼气池，以沼气的形式产生能量，并有望重新分配用于社区用途。从头开始，通过评估玉米糠，西瓜和木薯皮的灰分和水分，C / N比，生化需氧量（BOD）和化学需氧量（COD），对基质的生物降解性测试进行了研究。结果表明，灰分为2.85、0.66和2.40％，水分为11.18、93.22和70.26％，C / N比为12.10、15.10和19.10％，BOD为155.07、131.96和113.79 ppm，240.00、212.00和264.00分别为底物的ppm。结果表明，灰分最高的玉米糠的可生物降解性最少，而灰分最少的西瓜则具有最高的生物降解性。玉米糠和西瓜的含水量结果低于和高于最佳值“ 60–80％”，这证实了单独使用时产生的沼气量低。厌氧消化的理想C / N比在“ 20：1和30：1”之间。对研究中这些值的比较表明，从研究工作中获得的C / N比值低于C / N比值的最佳值，这可能是分离的底物沼气产量低的原因。混合后的底物在保留时间结束时产生的沼气量为2100毫升，比分别用玉米谷壳，西瓜和木薯皮（分离的底物）分别产生的18、25和29毫升高。在这项研究中，每种底物的COD值均高于相应的BOD值。因此，共同消化不可避免的食物浪费是经济的，并且是产生替代性可再生能源供农村社区使用的潜在可行选择。

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