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Image copyright Wessex Water Image caption The 40-seat "Bio-Bus" runs on biomethane gas generated through the treatment of sewage and food waste 
  
 The UK's first bus powered entirely by human and food waste has gone into service between Bristol and Bath. 
  
 The 40-seat "Bio-Bus" runs on biomethane gas generated through the treatment of sewage and food waste. 
  
 The eco-friendly vehicle can travel up to 300km (186 miles) on one tank of gas, which takes the annual waste of about five people to produce. 
  
 It is run by tour operator Bath Bus Company and will shuttle people between Bristol Airport and Bath city centre. 
  
 The biomethane gas is generated at Bristol sewage treatment works in Avonmouth, which is run by GENeco, a subsidiary of Wessex Water. 
  
 GENeco general manager Mohammed Saddiq said: "Gas-powered vehicles have an important role to play in improving air quality in UK cities but the Bio-Bus goes further than that and is actually powered by people living in the local area, including quite possibly those on the bus itself." 
  
 How do you power a bus with waste? 
  
 Media playback is unsupported on your device Media caption The bio-bus runs between Bath and Bristol Airport 
  
 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 odour free emissions 
  
 Compared to conventional diesel vehicles, up to 30% less carbon dioxide is emitted 
  
 Green capital 
  
 The service from the airport to Bath carries about 10,000 passengers each month. 
  
 Bath Bus Company's Collin Field, said: "With so much attention being directed towards improving air quality generally, the public reaction to the appearance of this bus on a service between a world heritage city and an airport will further focus on the potential for this particular fuel." 
  
 He said the bus was being launched at a very "appropriate" time, as Bristol is to become the European Green Capital next year. 
  
 Bristol sewage treatment works processes around 75 million cubic metres of sewage waste and 35,000 tonnes of food waste each year. 
  
 A total of 17 million cubic metres of biomethane, enough to power 8,300 homes, is generated annually at the plant through a process known as anaerobic digestion. ||||| Here’s an unusual math problem: How many miles can a bus travel on five years worth of human waste? 
  
 Answer: 186. 
  
 This is the distance the Bio-Bus — dubbed the “poo bus,” the United Kingdom’s first — can drive before a refill. It hit the road on Wednesday, traveling between Bristol and Bath. 
  
 According to the BBC, the 40-seat bus, run by tour operator Bath Bus Company, actually runs on biomethane gas, a byproduct created when oxygen-deprived bacteria breaks down food scraps and the stuff we flush down the toilet. Before the gas is bus-ready, the carbon dioxide must be removed and propane added. The “impurities” are removed so the gas doesn’t smell like a potty. 
  
 The fuel comes from the Bristol’s sewage treatment facility, which is run by GENeco, a renewable energy company. Their motto: “We make waste work!” 
  
 The facility processes about 35,000 tons of food waste per year, producing enough biomethane to power 8,300 homes. 
  
 “The bus also clearly shows that human poo and our waste food are valuable resources,” Charlotte Morton, the chief executive of the Anaerobic Digestion and Bioresources Association, said in a statement, adding that biomethane could supply about 10 percent of the United Kingdom’s domestic gas needs. 
  
 “Gas-powered vehicles have an important role to play in improving air quality in UK cities but the Bio-Bus goes further than that and is actually powered by people living in the local area, including quite possibly those on the bus itself,” GENeco’s general manager Mohammed Saddiq told the BBC. 
  
 According to the BBC, the bus’s combustion engine is similar to that of a regular diesel bus, only it emits 30 percent less carbon dioxide. The only telltale sign the bus isn’t a run-of-the-mill gas guzzler are dome-shaped tanks on top that store the gas. Well, that and the bus wrap featuring cartoons of passengers sitting on the toilet. 
  
 The bus’s debut comes as Bristol is set to become Europe’s 2015 “Green Capital,” an award given each year to a European city with a good environmental track record. Predictably, it was greeted with potty humor: 
  
 #BioBus #DadJokes Which line is it? Number Two? Does it have stools instead of seats? Does it run a wee late? — Antony Collins (@ant_tweets) November 20, 2014 
  
 Britains first Bus powered by poo insists other road users should ‘give it at least 15 mins’ before following it. #poobus — Graeme Casey (@graeme_l_casey) November 20, 2014 
  
 Accident investigators are examining a huge skid mark left on a bend. #poobus — LUFCMadferret (@LiloMan_LUFC) November 21, 2014 ||||| Get a quote 
  
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Move over, poop cruise. There's a new poop-related form of transport on the road, and this one is more neat than nasty. A "Bio-Bus" that runs solely on the biomethane gas generated by treated waste (of the food and human variety) is up and running as of this week in the UK, where it's following a Bristol-to-Bath route. The BBC reports that the 40-seat bus can go 186 miles on a single tank of gas; creating that tank requires the equivalent of five people's waste for one year. (It's unclear if that's sewage waste only, or includes a person's food waste, too.) The bus emits 30% less carbon dioxide than a comparable diesel engine would. GENeco runs Bristol sewage treatment works, which produces the gas through a process known as anaerobic digestion: oxygen-hungry bacteria break down the waste, producing the gas; carbon dioxide is removed and propane is added. Also removed: "impurities" that might make the bus smell like, well, your bathroom. A quote from GENeco's GM, which may have passengers eying each other warily: The bus "is actually powered by people living in the local area, including quite possibly those on the bus itself." The Washington Post notes the news has been predictably greeted with bathroom humor. Among the funniest tweets, compliments of @ant_tweets: "Which line is it? Number Two? Does it have stools instead of seats? Does it run a wee late?"