In nature, waste equals nutrients. Biogas follows the same example as it represents a renewable resource whose origin is precisely organic waste.
In urban environments, a large amount of biodegradable waste is also created, which is collected in the organic waste bin: fruit peels, egg shells, coffee grounds, etc.
Using this waste as a raw material and others such as the sludge produced by wastewater treatment plants (WWTP), it's possible to produce biogas and give it a variety of uses.
For example, this biofuel can be used in city buses. It's also possible to mix it with natural gas to feed boilers, kitchens, heating, etc. It can even be used as fuel for electricity generators.