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.
Market Suggested Retail Price
Distributors / Implementing Organizations
This product is implemented by MBSA in partnership with FACT Foundation.
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.
Intellectural Property Type
User Provision Model
Distributions to Date Status
As of 2012, five Oil Extraction Sites (OES) and five Multifunctional Platforms (MFP) have been distributed.
Output energy product
Average daily biogas production (m3/day)
Description of waste source(s)
Animal dung mixed with Jatropha press cake
Waste input requirements (kg per hour or day)
5 kg solid mass per day
Description of other input requirements
Other input requirements (amount per hour)
8 L per day
System dimensions (m)
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
Manufacturer Specified Performance Parameters
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. As part of this process, the SOXHLET is designed to press 3,000 kg of Jatropha seeds per hour pp24, yielding 0.29 kg of oil per 1 kg of seeds pp260.
Vetted Performance Status
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.
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
Complementary Technical Systems
Complimentary technical systems include a 20 W solar powered air pump.
Academic Research and References
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.
Compliance with regulations
None specified by MBSA. FACT Foundation's mandate is to develop biofuels in accordance with European quality standards. Thesis by Kevin Chapon
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