MBSA Biogas Plant
Mali Biocarburant SA (MBSA)
The MBSA Biogas Plant is a system that uses waste created from Jatropha oil processing to produce biogas.
The MBSA Biogas Plant is a biodigestor developed by MBSA to produce biogas from Jatropha nut oil extraction sites and surrounding rural communities. A Jatropha nut seedcake is a by-product of the nut oil extraction process, and is mixed with human or animal waste and water in the Biogas Plant to produce biogas for use in cooking or to fuel a generator.
This product is implemented by MBSA in partnership with FACT Foundation.
Market retail price for a 10 m3 plug flow digester bag is expected to be 200 USD pp 37. Converted 22 July 2019
Goal 7: Affordable and Clean Energy
This product is manufactured by MBSA for use at one of their Oil Extraction Sites (OSE), and at least five of these sites have been manufactured pp23 in Mali and Burkina Faso. Manufacturing method is currently on a per demand basis from fiber-reinforced PVC, and the connecting pipes are also made from PVC.
As of 2012, five Oil Extraction Sites (OES) and five Multifunctional Platforms (MFP) have been distributed.
The form of energy that is created by this system
Types of input waste
Manufacturer-specified system capacity
Description of other consumables required for energy production
Quanity of consumables required per hour
The size of this system
The MBSA Biogas plant is a plug flow type digester made of a fibre re-enforced PVC bag of 10 m3 for anaerobic digestion. Inlet and outet connections are made through 110 mm PVC pipes, and the air input is achieved through an aquarium pump that injects air into the bag through a small plastic hose. A plastic valve is also in place to control the air flow in the system, and a 20W photovoltaic system supplies electricity for the pump. Additional components like a condensation trap, a flow meter, a pressure release system with pressure meter, and 3 valves (gas network control), are required. Thesis by Kevin Chapon
The system has a length of 7.0 m and a width of 2.6 m.
Training needs and support provided by MBSA staff.
Replacement components can be sourced through MBSA foundation and manufacturing plants. MBSA understands and focuses on the need for simple replacements using in-country supplies. Thesis by Kevin Chapon
The manufacturer specified targets are to add value to the farming of Jatropha, increasing crop yield rates by 20% in five years, and to add an additional income of ~1 USD per day to farmers.
Testing of biogas input, performance and effectiveness of liquid/solid separation for use as a fertilizer was conducted in 2011 by Kevin Chapon from AVANS Hogeschool working with MBSA and FACT. These are some of the findings:
• The hydraulic retention time of the system is set at 50 days, so the daily input of feedstock is 1/50 of the digester volume.
• Wet mixture represents 6 m3, so the daily input should be 120 liters.
• The supply of the digester started with 35 kg of cattle dung associated to 55 liters of water during the first month. The amount of manure was decreased by 5 kg every two weeks while adding Jatropha press cake to the mixture. After two and a half months, the digester was supplied by 15 kg of manure and 8 kg of Jatropha press cake.
• The average daily biogas production is 2.71 m3/day.
Testing was done in 2011 on site in Mali (Koulikoro) with MBSA in association with FACT Foundation, a Dutch NGO. Thesis by Kevin Chapon
One of the by-products of the digester is hydrogen sulphide, a colorless, very poisonous, flammable gas with the characteristic foul odor of rotten eggs at a concentration up to 100 ppm. Thesis by Kevin Chapon
Complimentary technical systems include a 20 W solar powered air pump.
The most useful and relevant academic paper is by Kevin Chapon from Dutch AVANS School who did his thesis work with MBSA’s biogas system on separation of effluents for fertilizer use:
Chapon, K., 2011, Utilisation of the effluent of a plug flow digester. Bachelor Environmental Technology & Management Final year project with FACT Foundation. Environmental Technology & Management, Avans University of Applied Science, Breda, Netherlands.
As MBSA’s biogas systems are still under development there are no peer reviewed journals on their biogas system. However there are papers on general biofuel development in Mali and use of Jatropha nuts that involve MBSA:
Achten, W., Maes, W., Aerts, R., Verchot, L., Trabucco, A., Mathijs, E., Singh, V., Muys, B., 2010, Jatropha: From global hype to local opportunity. Journal of Arid Environments. Volume 74. Issue 1. pp 164-165.
Basinger, M., Chen, J., Jeffrey-Coker, F., Rodriguez-Sanchez, F., Singer, T., Modi, V., 2012, Jatropha adoption: a statistical observational study of factors influencing Malian farmers’ decision to grow Jatropha. Agroforestry Systems. Vol 84. Issue 1. pp 59–72.
Two useful articles on flexi biogas plants:
Sehgal, K., Wanjihia D., Kembe M., 2012, Flexi Biogas systems: inexpensive, renewable energy for developing countries. International Fund for Agricultural Development.
Vijay, V., 2014, Technical and field performance evaluation of flexi biogas plants. International Fund for Agricultural Development.
None specified by MBSA. FACT Foundation’s mandate is to develop biofuels in accordance with European quality standards. Thesis by Kevin Chapon
Methods referenced in testing by Kevin Chapon (MBSA/FACT) include comparing best drying technique of the affluent via passive solar radiation vs straw filtration, as well as comparison of traditional fertilizer performance with that of biogas by-products as fertilizer.
Performance can be improved through better anaerobic digestion process, general system efficiencies improvements, incorporation of techniques and technologies to allow for various biofuel inputs, increasing biogas conversion rate, reducing water input and/or recovering some of the water through system recycling and re-use. Improving ways to recover and utilize biogas by-products (effluent) as a fertilizer can also lower operation costs, reduce payback period, and increase a farmer’s income. As some power is also required for operation, connecting to a complementary and readily available source of power like solar PV can be very useful. Thesis by Kevin Chapon
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