Dominic Wanjihia is an inventor who has designed an alternative method to traditional biogas production. It’s dubbed “Flexi Biogas” - a cheaper, more efficient, easily transportable option that looks like this, when fully installed and producing gas:
The MotiveDominic wants to do something about the massive deforestation rates seen throughout Africa. Up to 90% of domestic fuel comes from deforestation, causing irreversible damage to large parts of the continent. The cutting down of trees, along with global warming, are both contributing significantly to desertification (the turning of fertile land to desert) in large parts of sub-Saharan Africa, which is obviously cause for major concern, considering this is an area already prone to devastating famines. Slowing down deforestation rates over the next decade will present a massive challenge for large parts of the globe, and increased Biogas production is a viable, safe, environmentally friendly option that could potentially curb the heavy over-reliance on wood.
How It WorksBiogas is the gas produced by the biological breakdown of organic matter in the absence of oxygen. The process is very simple: you add dung to water 1:1 and mix to resemble what Dominic described as a “thick soup”. The Dung will typically come from cows, but human, or any other animal waste can be used, as well as organic domestic waste. Add the mixture to the device through a pipe and simply wait for the gas to be produced.
What’s Different?Traditional biogas producers are extremely expensive, complex and labour intensive to install. They are also slow at producing gas, as the chamber is underground. Flexi Biogas is above ground, offering higher temperatures and increased enzyme activity thus speeding up gas production from (typically) 30-90 days, to less than two weeks.
PossibilitiesEarly research has shown the waste from one cow (10-15kg per day) is enough to sustain a household of 4 people, meeting their domestic fuel needs for cooking. It is also possible to run a converted generator off the gas that can make electricity to power homes, schools and shops, or recharge batteries.

There are several possibilities with Flexi Biogas to involve and benefit communities: Excess gas could be sold on to or shared with neighbours; generators could convert gas to electricity which could then be sold on to power companies; the composted “dung” inside the device turns into composted manure (one of the best organic fertilisers) and could either be reused by the community, or packaged and sold on. Job creation would also be possible through installations, maintenance and in remote areas requiring the transportation of organic waste where availability is limited:


Flat-packed and ready to go!
SafetyBiogas is considered extremely safe, as non-poisonous methane gas is produced. Unlike LPG (propane and/or butane), which is heavier than air and can drip down on to cooking or electrical equipment causing fire hazards, methane is lighter than air and evaporates immediately.
CostThe Flexi Biogas producers come in three different sizes – 6, 9 and 12 cubic metres. Prices start from KSH 30,000 (approx. £240) for the smallest size, to 43,000 (£340) for the largest. Compare this with between KSH 300,000 - 1,000,000 for the conventional ones, and you are getting pretty good value.
Opportunities with ICROSSWe are currently in the early stages of developing a proposal through New World International (the Irish charity partnering ICROSS) that could see Flexi Biogas devices installed near our clinics to power refrigerators, used to store volatile vaccinations. Due to the remoteness of some clinics, power failures (typically gas bottles running out) consequently leave communities without vaccinations for several months. Since these communities would be able to produce Flexi Biogas independently, this would no longer be a problem.
Over the coming months we are aiming to can get a couple of trial devices installed in our nearby projects, as Dominic is eager to continue testing them out in conjunction with schools, local communities and NGOs. He has many other devices/projects in development (including a "Dung Taxi" pictured above) that could potentially be of great value to many, particularly in rural locations.

Dominic: “I go to areas with issues and look at how to solve them with what they’ve got.”
… which, from my brief experience out here so far, is definitely not a lot, further highlighting the potential of Biogas.
www.newworldinternational.org
www.afrigadget.com