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Optimization of adsorbent dose and contact time for the production of jackfruit waste nutrient-enriched biochar

Waste Disposal and Sustainable Energy 2023年第1期5卷 63-74页

作者： denis nsubuga Isa Kabenge Ahamada Zziwa Vianney Andrew Yiga Yusufu Mpendo Mawejje Harbert Ronald Kizza Noble Banadda Kerstin D.Wydra Department of Agricultural and Biosystems Engineering Makerere UniversityP.O.Box 7062KampalaUganda Department of Mechanical Engineering Makerere UniversityP.O.Box 7062KampalaUganda Department of Agricultural Production Makerere UniversityP.O.Box 7062KampalaUganda School of Engineering University of British ColumbiaEME242-1137 Alumni AveKelownaBCCanada Plant Production and Climate Change Erfurt University of Applied SciencesLeipziger Straβe 7799085ErfurtGermany

Raw biochar can be enriched with nutrients from digestates through adsorption producing nutrient-enriched *** nutrient-enriched biochar can be used as a soil amendment to support sustainable *** study assessed the effect of adsorbent dose and contact time on the jackfruit waste biochar adsorption of essential nutrients of nitrogen,phosphors and potassium from the *** surface methodology(RSM)using central composite design(CCD)was utilized to optimize the adsorbent dose and contact time during the adsorption *** adsorbent dose of 20–70 mg/g and contact time range of 48–120 h were used in this *** optimal adsorbent dose and contact time were found to be 20 mg/g and 114.6 h,*** corresponding optimum nitrogen,phosphorus and potassium adsorbed were 17.44,20.94,and 21.36 mg/g,*** for the prediction of these values for nitrogen,phosphorus and potassium had R2 values of 0.9801,0.9804 and 0.9843,respectively,and non-significant lack of fit(p<0.05).This indicates the suitability of the models in predicting the adsorption conditions of adsorbent dose and contact time to produce high-quality nutrient-enriched biochar.

关键词： Adsorption Response surface methodology Digestate Nutrient-enriched biochar

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Innovations in Value-Addition of Agricultural By-Products in Uganda

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Journal of Environmental Protection 2019年第11期10卷 1493-1506页

作者： denis nsubuga Noble Banadda Nicholas Kiggundu Department of Agricultural and Biosystems Engineering Makerere University Kampala Uganda Department of Agricultural and Biosystems Engineering 1340 Elings Hall Ames Iowa USA

The purpose of this review was to profile the existing innovations in the value addition of agricultural by-products and suggest innovations that could yield more value-added products from the available agricultural by-products in Uganda. These by-products were from crops, livestock, fish and forestry sub-sectors. The review indicated 7.8 million tons from the crops’ subsector, 6.69 million skins and hides, 2280 million tons of cow dung and 390,550 tons of chicken dung from the livestock subsector, 36,000 tons from the fish subsector and 440,000 m3 of sawdust and offcuts from the forestry sub-sector. Current innovations in value-addition of agricultural by-products included the making of briquettes, organic fertilizers, biogas, biochar, pellets and organic pesticides from the crop subsector. Cow dung from the livestock is used for plastering walls of houses, used as fertilizer and used for the production of biogas. Chicken droppings are as well used as fertilizer and for production of biogas. Fish frames and skins are mainly consumed in smoked form whereas trimmings are usually rolled into fish balls and then fried for people to eat while the fats are used for frying the fish balls. Sawdust has been mixed with cement to make wood-cement composite bricks that reduce the overall weight of the building. It is also being used as feed in the Indigenous Micro-Organisms (IMO) technology in the production of pigs. Proposed innovations include the use of bones to produce soft tissue, buttons, knife handles and bone meal. Blood can be used in making adhesives and fertilizers while fish oil is a major dietary source of long chain omega-3 polyunsaturated fatty acids and so can be utilized to enrich different food products.

关键词： Value Addition Agricultural Waste By-Products Innovations in Agriculture Agricultural Value Chains

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Comparative Study of Biogas Production from Jackfruit Waste, Banana Peels, and Pineapple Peels Co-Digested with Cow Dung

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Journal of Sustainable Bioenergy Systems 2023年第1期13卷 1-15页

作者： Tadeo Mibulo denis nsubuga Isa Kabenge Nicholas Kiggundu Kerstin D. Wydra Department of Agricultural and Biosystems Engineering Makerere University Kampala Uganda Plant Production and Climate Change Erfurt University of Applied Sciences Erfurt Germany

Only 42% of Uganda’s population has access to electricity. The population continues to use firewood and charcoal as a source of energy, which leads to depletion of forests thus to climate change. The purpose of this study was to assess the potential of biogas production from jackfruit waste, banana peels, and pineapple peels when co-digested with cow dung as an alternative energy source. Substrates for each waste were co-digested with varying proportions (0%, 25%, and 50%) of cow dung using laboratory-scale 250 mL anaerobic digestors. The total biogas generation for jackfruit waste, banana peels, and pineapple peels after 30 days of anaerobic digestion was 82.3, 189, and 262 mL, respectively. When jack fruit waste, pineapple peels and banana peels were co-digested with 25% cow dung, the total amount of biogas produced increased by a factor of two and three, respectively. However, 50% of cow dung only significantly (p ≤ 0.05) improved for jack fruit waste by two folds. Therefore, the results indicated that jackfruit waste, banana and pineapple peels can be used for biogas production to augment energy supply. .

关键词： Biogas Co-Digestion Jackfruit Waste Banana Pineapple Peels

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