The coffee oil is then blended with other fuels to create B20 biofuel, which can be used in diesel buses without modification. Seeing as I'm already on my third cup of the day writing this, hence all the maths going on here, I'm definitely doing my bit for London's transport situation.
Global energy and petrochemicals group Shell, in partnership with London-based clean technology company bio-bean and United Kingdom biodiesel producer Argent Energy, is helping power some of London's buses through a new coffee biodiesel project - launched on Monday - which uses a biofuel made partly from waste coffee grounds.
-Biofuel made using waste products such as tallow from meat processing and cooking oil had already supplied in numerous capital's 9,500 buses.
The startup collects used coffee grounds from cafes, restaurants and factories, and transports them to its recycling facility.
On average, Londoners consume 2.3 cups of coffee a day, contributing to 200,000 tons of coffee waste over the course of a year, according to The Daily Star.
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Working with biofuel producer Argent Energy, the B20 biofuel contains a 20% bio-component and 80% cent traditional diesel.
According to the website of Transport for London, it has been turning to biofuels to curb carbon emissions, trialing a fuel made with used cooking oil from the catering industry.
Technology firm bio-bean says it has produced enough coffee oil to power one bus for a year. Founder Arthur Kay tells the Independent that coffee actually has very high oil content - 20 percent by weight - so "it's a really great thing to make biodiesel out of". 6,000 litres of coffee oil has been produced, which if used as a pure-blend for the bio component and mixed with mineral diesel to form a B20, could help power the equivalent of one London bus for a year.
Bio-bean has been using coffee to deliver energy for a short while now, giving households the ability to burn coffee instead of wood for their fires.