Flexi Biogas BG5

Target Users (Target Impact Group)

Distributors / Implementing Organizations

Although distribution started as part of an IFAD program, Biogas International Limited is the sole distributor to date. There are a few local and regional agents who market and install systems on their behalf as well.

Manufacturing/Building Method

Locally manufactured with specially treated robust materials designed to withstand all weather conditions in Nairobi, Kenya.

Intellectural Property Type

Patent Protected

User Provision Model

Biogas International Limited is the sole manufacturer and distributor.

Distributions to Date Status

500 Flexi Biogas systems were distributed between 2011 and early 2014. This product started as a pilot program launched by the IFAD. The IFAD intended to deploy about 1,000 more systems over the course of 2014–2016.

Design Specifications

The Flexi Biogas BG5 includes four key parts: plastic input and output pipes, a reinforced plastic digester bag, plastic piping to transport biogas to home or storage, and a plastic greenhouse covering. The system can run on any biodegradable matter - cow, pig, goat, sheep, rabbit or/and chicken dung, kitchen waste, market waste, grass, water hyacinth, farm weed, and garden clipping.

• Digestor: 6m x 3.75m plastic bag made of PVC tarpaulin. High cost of good-quality plastic, increasing the price of fabrication.
• Greenhouse Tunnel: Polyethylene plastic. Trapping heat and keeping the temperature between 25 and 36°C. During the day the tunnel captures solar radiation, increasing the temperature of the organic waste material (substrate) in the digester.
• Pipeline: gas piped through a PVC tube of 15 meters connected to an appliance or piece of equipment such as a gas stove for cooking.
• Cross-flow design: prevents overloading of the system and crusting (scum formation). This system does not require agitation.
• Weight: 10 kg
• Startup manure required: 1 ton

Technical Support

Free, provided by Flexi Biogas Solutions. Upon installation, users are trained on how to run and maintain the system, what does and what doesn’t, troubleshooting the system, and how to solve hitches. Technical support to all the clients is offered 24/7 via mobile phone and email.

Replacement Components

1-year warranty on all components against manufacturer defects. Apart from the digester envelope itself, all other components are "off-the-shelf" and are available for replacement in every hardware store.

Lifecycle

This product has a lifespan of at least 10 years and it can be enhanced by applying a sunscreen UV block solution every seven years. The greenhouse tunnel requires replacement every 5 years.

Manufacturer Specified Performance Parameters

The manufacturers specify the following as the system's benefits:

• Flexi Biogas systems are prefabricated and installed in a few hours.
• The overflowing bio-slurry from the system is a highly nutritious fertilizer ready for absorption by plants without ”burning the plants”. It can also be applied as a top dressing or sprayed on plants as an effective pest repellent.
• Flexi systems run on any bio-degradable matter. High calorific feedstock produces larger volumes of gas.
• FlexiTech employs “True Cross-flow” fermentation, which means that what goes in one end is fully processed before exiting the other. This also means that 100% of the biogas is captured making FlexiTech the GREENEST biogas plant design yet.
• After installation, the system will have usable volumes of gas within 3 – 5 days and is normally in full production within 7 – 14 days.

Vetted Performance Status

A technical and field performance evaluation of Flexi biogas plants was conducted by the  International Fund for Agricultural Development. As a conclusion on the study, researchers stated:

• Women can play an effective role in earning their livelihood through Biogas by forming self-help groups that can install and maintain biogas plants.
• The Flexi biogas BG5 generally meets cooking and heating requirements for a family of 4-6 people.
• The Flexi biogas system can be recommended to small and poor families as it is easy and quick to install with the temperature-controlled conditions.

Safety

There are some dangers associated with biogas digesters: fire hazard, leaks, and negative pressure, but since this is a small/ family size system the hazards are also lower.

Complementary Technical Systems

A BioDC generator can be acquired in order to run  automotive chargers, for powering lights, TV, radio phones, etc.

Academic Research and References

Compliance with regulations

Unknown

Other Information

Biogas International Limited also offers other products like gas systems, utilities, bio-slurry systems, and more.