A revolutionary household biogas system turns organic waste into clean biogas for cooking
HomeBiogas is an affordable and compact anaerobic digester that converts organic waste into cooking gas and liquid fertilizer. It was developed by an Israeli startup, which managed to advance the already known technology of large-scale biogas power plants to a micro scale level which can be used for household use. Their Indiegogo crowd-funding campaign has already ended and reached 200% of its initial goal last January, but they continue to offer the product lower than the retail price. According to their timeline, the first shipments will begin the following August.
How does it work
Organic waste such as food scraps (even meat), kitchen trash and pet manure is fed into the system’s digester tank which is filled with water. In the absence of oxygen, the anaerobic microorganisms found in the water biodegrade the organic matter and digest it, resulting to biogas creation.
At the other end of the system, the clean biogas (approx. 65% CH4, 35% CO2) and fertilizer are emitted. A special mechanism regulates the gas pressure, enabling the gas to be delivered at a stable and predictable pressure, as required for reliable cooking or heating (devices compatible with low pressure biogas are needed). The built-in tank stores 400 litres of gas. Any additional gas generated, is automatically released and dissipates into the atmosphere. The biofertilizer can be used in gardens or for other vegetation, including hydroponic systems with detached beds.
According to the company, HomeBiogas can process up to 6 litres a day of food waste or up to 15 litres a day of animal manure. Every litre of food waste produces about 200 litres of gas, or the amount needed to cooking for one hour over a high flame. On average, HomeBiogas can produce clean gas for up to 3 hours of cooking and 5-10 litres of clean natural liquid fertilizer daily. A minimum ambient average day/night temperature of 17°C (66°F) is necessary for the system’s operation.