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16/02/2018 Comments (0) Environment, Technology

Turning waste into city gas

For 400 euros, HomeBioGas allows you to transform the leftovers of the table into enough natural gas to cook every day. Bye-bye gas plant, hello micro-methanisation.

What if producing your own gas at home became easy and environmentally friendly? This is the belief of the young Israeli start-up HomeBioGas, responsible for the design of this compact biogas converter delivered as a home kit. Their system transforms kitchen leftovers into gas for cooking and heating. A cycle that is very virtuous, helping to reduce our carbon footprint… And because really nothing is lost, the last small leftovers, recycled in liquid form, constitute an excellent organic fertiliser for your small vegetable garden.

This compact and ecological digester works without electricity by using the principle of methanisation (anaerobic digestion), which consists in transforming, without any oxygen but thanks to bacteria, the organic matter in biogas composed of methane and carbon dioxide. The digester’s capacity can count up to 12 litres of food waste or 36 litres of animal manure per day, to ensure about 3 hours of cooking and 20 litres of liquid fertiliser.

Methanisation is a well-known technique of waste recovery. Applied at the domestic level, it can be part of the solutions to reduce urban pollution. In Assyria, traces of baths heated with biogas are already found in the 10th century B.C. In Europe, the first significant developments in the anaerobic digestion have appeared much more recently, in the years 1970, after the oil crises. Several thousand tonnes of waste began to be treated, on farms or on an industrial scale, in processing reactors called digesters.

Very energy-intensive cities

Making gas with waste is nothing revolutionary. The difficulty was to be able to use this system in domestic households by offering a solution that is both practical and economical. In Europe, depending on the country, 14 to 47% of urban waste is biodegradable. They therefore represent a wealth to be exploited by households. The HomeBioGas holds in a small box and is assembled like a piece of furniture in a kit! Its price is also interesting since it costs only 400 euros. A reasonable amount compared to the savings that can be achieved with it: up to 300 euros per year for an average household.

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