Design of a Co-Digestion Biogas Plant to Curb Deforestation-Case Study of Phalombe Secondary School in Malawi

Kawelamzenje, Nyirenda Austin; Twizerimana, Maurice; Bernadette, Dushengere; Bakundukize, Alexis

doi:10.4236/oalib.1107255

Cited by 3 publications

(4 citation statements)

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“…Similar postura asume [16], ya que, para realizar su diseño a escala del biodigestor anaeróbico, también se apoyaron en estudios previos de cuantificación y caracterización de residuos sólidos orgánicos en Ecuador, siendo el biodigestor escalado en CAD de 45 litros, 0.386 m de alto y 0.386 m de diámetro. Asimismo, en Malawi [17], realizaron el diseño y las estimaciones de su biodigestor, a partir de un estudio previo que halló las 1.384 toneladas diarias de residuos orgánicos, luego escalaron en Auto CAD su biodigestor de 61000 litros. Otra perspectiva es la que sostienen [43], puesto que analizaron la presión interna de un biodigestor anaerobio y la viabilidad de su instalación ingenieril, a través de una simulación física a escala de laboratorio mediante SolidWorks, lo que les permitió ahorrar recursos y gastos en mano de obra.…”

Section: Resultados Y Discusiónunclassified

“…Para el diseño de biodigestores, es fundamental calcular la cantidad de residuos sólidos orgánicos [16], [17]. Asimismo, se debe contar con sólidos conocimientos en sistemas de modelamiento a escalas 2D y 3D; donde se deberán analizar los modelos, tamaños y formas del biodigestor; tomando en cuenta aspectos de espacio del terreno, clima y presupuesto [18], [19].…”

Section: Introductionunclassified

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Design of discontinuous biodigesters for the production of biofertilizers from organic solid waste from the market of the Casa Grande district, La Libertad Region, 2021.

Casanova¹,

Rojas²,

Fernandez³

et al. 2022

Proceedings of the 20th LACCEI International Multi-Conference for Engineering, Education and Technology: “Education, Research A

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Section: Resultados Y Discusiónunclassified

Section: Introductionunclassified

Design of discontinuous biodigesters for the production of biofertilizers from organic solid waste from the market of the Casa Grande district, La Libertad Region, 2021.

Casanova¹,

Rojas²,

Fernandez³

et al. 2022

Proceedings of the 20th LACCEI International Multi-Conference for Engineering, Education and Technology: “Education, Research A

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“…However, most of the dis-adopters attributed inadequate dung (in terms of quantity) as one of the reasons for dis-adoption of biogas technology. In addition, it is necessary to explore other feedstocks apart from animal dung and explore the possibility for the co-digestion of dung with other substrates, such as food and vegetable wastes and lignocellulose wastes [12,24,25].…”

Section: Barriers To Biogas Technologymentioning

confidence: 99%

“…Biogas technology, like many other renewable energy technologies, has not taken off as expected in the country [7]. However, other African countries, such as Kenya, Uganda, Ethiopia, Tanzania, Rwanda, Cameroon, Burkina Faso, and Benin, have profited from the technology [12]. Some of these countries border Malawi and have the same tropical climate conditions as Malawi, suggesting it may be appropriate for biogas technology.…”

Section: Introductionmentioning

confidence: 99%

Opportunities and Barriers to Biogas Adoption in Malawi

Kulugomba,

Mapoma,

Gamula

et al. 2024

Energies

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Malawi has the potential to explore the utilization of biogas technology. The technology has existed in the country for decades. However, the uptake has been lower than expected. Further, there has been a high rate of dis-adoption of the installed systems. To deal with the problem, this study explored the opportunities and barriers to biogas technology to enhance biogas adoption and utilization in Malawi. Qualitative research methods using key informant interviews were employed to collect the data from biogas adopters, dis-adopters, potential adopters, and experts. A total of 22 households and 6 experts were interviewed. The findings of the study show that the country has opportunities for biogas adoption and utilization. The most mentioned opportunities were livestock farming practices, constraints to access to reliable energy sources, associated benefits of biogas technology, and land holding. However, the adoption of the technology has faced several challenges. Commonly cited barriers were the high installation and maintenance costs, inadequate feedstock, inappropriate dissemination approaches, lack of training after installation services and expertise, lack of reliable water sources, absence of ownership, lack of cooperation amongst institutions involved in biogas promotion, lack of a coordinating body for institutions involved in biogas dissemination, lack of standards, and socio-cultural factors. To overcome the challenges, strategies were identified, and these include the provision of incentives, loans and subsidies, provision of technical support services, having demonstration sites, employing suitable dissemination approaches, co-digestion or diversification of raw materials, awareness campaigns, and collaboration amongst sectors involved in biogas dissemination.

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Exploring the potential role of decentralised biogas plants in meeting energy needs in sub-Saharan African countries: a techno-economic systems analysis

Robin,

Ehimen

2024

Sustainable Energy res.

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To achieve the Sustainable Development Goals by 2030, low-income sub-Saharan African countries urgently need to electrify. Biogas production from anaerobic digestion could make a contribution to a solution to improved electricity generation and access in these regions. This study evaluates its feasibility using Malawi as a case study. The aim is to provide households with a continuous supply of gas for cooking and electricity. The study examines different sizes of fixed dome reactors (3, 6, 12 m3) and assumes individual household ownership of 2, 4, and 6 cows. Several feedstocks and conditions are considered, such as cow dung alone, co-generation of cow dung with human faeces, cow dung with grass, and cow dung with maize residue. The economic benefits of selling biogas and fertilisers are calculated, and the cost of construction for different sizes of reactors is determined. Results show that co-generation of cow dung and grass silage in the reactor of 12 m3 with six cows has a positive net present value (NPV) of $8962, while for a small farm with a 6 m3 reactor capacity, co-digestion of cow dung with maize residue is preferable. The feasibility of the technology depends heavily on current national economic conditions, such as inflation, electricity prices, and construction material costs. A sensitivity analysis estimated that a 25% increase in the cost of electricity could increase the net present value (NPV) from − $3345 to $1526 for the generation of biogas from cow dung alone. Overall, this technology could have a significant impact on the lives of low-income households in sub-Saharan Africa by improving their access to electricity and providing a source of income through the sale of biogas and digestate.

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Design of a Co-Digestion Biogas Plant to Curb Deforestation-Case Study of Phalombe Secondary School in Malawi

Cited by 3 publications

References 0 publications

Design of discontinuous biodigesters for the production of biofertilizers from organic solid waste from the market of the Casa Grande district, La Libertad Region, 2021.

Design of discontinuous biodigesters for the production of biofertilizers from organic solid waste from the market of the Casa Grande district, La Libertad Region, 2021.

Opportunities and Barriers to Biogas Adoption in Malawi

Exploring the potential role of decentralised biogas plants in meeting energy needs in sub-Saharan African countries: a techno-economic systems analysis

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