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Bio Bus: The Uk's First Food and Poo Powered Bus

Goes 186 Miles On A Tank Of Gas

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Produces Less Emissions Than Those From A Diesel Engine

This bus is powered entirely by biofuel from food and sewage. Introducing the Biobus, which now carries passengers between Bath and Bristol airports.

The "Poo bus" can travel up to 300km (186 miles) on one tank of gas, which takes the annual waste of about five people to produce.

This video explains a bit of the science behind the "biomethane".

A few interesting facts from the BBC's website about the bus*

- A single passenger's annual food and sewage waste would fuel the Bio-Bus for 37 miles (60km)
- Its combustion engine is similar in design to diesel equivalents in conventional buses
- Compressed gas is stored in dome-like tanks on the roof of the Bio-Bus
- The gas is generated through anaerobic digestion - where oxygen starved bacteria breaks down biodegradable material to produce methane-rich biogas
- To power a vehicle, the biogas undergoes "upgrading", where carbon dioxide is removed and propane added
- Impurities are removed to produce virtually odor free emissions
- Compared to conventional diesel vehicles, up to 30% less carbon dioxide is emitted

--Bibi Farber

* For more info see