Constructed of two large plastic tubs and mostly recycled materials, the zero-emissions bio-gas unit saves his family about LE 20 (three U.S. dollars) a month in gas bills. And in the ramshackle Darb El-Ahmar district where Farag lives, that works out to nearly a day’s wage.
Farag’s bio-gas digester converts organic waste fed into its 1,000-litre plastic tank into methane gas that can be used to heat water or cook food. Ordinary kitchen waste – everything from food scraps, to stale tea and mouldy bread – is soaked overnight in water to soften, then poured into the tank’s bacteria-rich soup to decompose. A pipe carries the methane gas produced to the family’s kitchen stove.Read more : http://www.ipsnews.net/2013/06/cairos-poor-convert-kitchen-waste-into-fuel-savings/