Good quesiton. In San Francisco, the East Bay Municipal Water District provides water to provide the food-waste-to-energy-and-compost program at it’s wastewater treatment plant. Food waste collected from restraunts and grocery stores is digested by bacteria that emits methane as a byproduct. The emitted methane is collected and used to generate electricity that helps run the treatment plant. The material that remains is then sent to a green-waste composting facility to be turned into fertilizer.
You can also use animal waste to produce electricity. San Francisco is trying to convert animal waste into fuel.
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