Besides poop, humans contribute much more to our sewage systems. Vegetable oils and animal fats from food scraps and washed dishes are some things that are also contributed.
Chemistry professor Lawrence Pratt wants to use pyrolysis to transform grease into fuel. Pyrolysis breaks down compounds into smaller molecules by heating them without oxygen to avoid burning. Pyrolysis would melt the grease and distill its vapors making it very similar to gasoline and thus, compatible with internal-combustion engines or a home-heating unit. All that's needed to collect the grease is a midsize wastewater plant that would averagely collect 15,000 tons of grease per year. This could produce 2.5 million gallons of fuel, enough to fuel 7,000 homes. Source: http://www.popsci.com/one-day-sewage-might-help-us-power-our-homes
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