#biodigester

Kieran, a longtime mechanical engineer, had just invented Ireland’s first micro-scale anaerobic biodigester.

What does one even do with a micro-scale anaerobic biodigester?

Well, this particular anaerobic biodigester takes care of nearly 100% of your food waste.

You feed in all your scraps and waste – even hard-to-compost foods like cooked meats, dairy, cakes and liquids go in. Then the anaerobic bacteria get to work breaking down the waste.

After that, out come two very different ready-to-use products: a biogas for cooking and a nutrient-rich liquid fertiliser for gardening.

Food waste goes in. Gas and fertiliser come out.

‘We were never really into gardening or growing food. That was the biggest thing to change with the digester,’ Kieran says.

‘During lockdown, we set up the polytunnel and started using the fertiliser from the egg to grow tomatoes and courgettes. Because not only have you got a way to get rid of your food waste, you’ve also got a way to grow more food. And the taste was extraordinary. We had loads of tomatoes so we gave them to friends. They couldn’t get over how tasty they were compared to what they were buying from shops.’

Biogas is a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen, called also anaerobic digestion. It is produced from biodegradable materials and more than half of the resulting gas is methane. You can run that through a propane burner or a stove, and worldwide, lots of subsisting people do. It’s about as close to free fuel as you can get. 

Of course, if you source a self-renewing pest crop like kudzu to produce your fuel, it becomes even more cost-effective. Of course, nothing is truly free. There is some physical labor involved in maintenance and cleaning.

Cost of overhead is minimal, and a 55-gallon drum biodigester can be hacked together from found items and salvage with minimal skill. Unless it’s larger than that, a digester setup should take no longer than one afternoon.These DIY pages are pretty concise, with detailed shopping lists. If you want this to happen, it’s not hard.

Granada biogas project start to finish

https://youtu.be/mWefbc1spd0

Four free, hot-weather plans, perfect for the Southern United States:

https://www.completebiogas.com/digester-plans

The success story of the biogas digester in Merida, Mexico:

https://youtu.be/ApDq4I20ZfU

How-to in Hindi and Urdu:

https://youtu.be/pKZgnXQCp98

Community-sized biogas plant reportback from Richmondvale:

https://www.completebiogas.com/B_55Gal.html

Solar Cities plastic drum biogas plant plans

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Expanding Global Partnerships