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We’re already extracting biogas from sewage and spreading treated sewage solids on farms and open space, so it’s also possible to run our cars on biofuel from sewage, too. Specifically, running them on sewage grease. An enormous amount of grease enters our sewer systems - about 495 million gallons annually in the USA alone. Most of it gets captured and collected at sewage treatment plants.
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Biogas typically refers to a gas produced by the biological breakdown of organic matter in the absence of oxygen. It is comprised primarily of methane and carbon dioxide. It can be combusted with oxygen and the energy release allows biogas to be used as a fuel. Considered a renewable fuel and electricity produced from it can be used to attract renewable energy subsidies in some parts of the world.
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