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Your car
can run on coffee!
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London: Waste coffee grinds
could be turned into a sustainable fuel to power vehicles, scientists have
found.
Oil can be extracted from coffee grounds by
soaking them in an organic solvent, before being chemically transformed into
biodiesel via a process called 'transesterification', according to
researchers from the Centre for Sustainable Chemical Technologies at
University of Bath.
As part of the study, the researchers made
biofuel from ground coffee produced in 20 different geographic regions,
including caffeinated and decaffeinated forms, as well as Robusta and
Arabica varieties.
"Around 8 million tonnes of coffee are produced
globally each year and ground waste coffee contains up to 20 per cent oil
per unit weight," said Dr Chris Chuck, Whorrod Research Fellow from the
Department of Chemical Engineering.
"This oil also has similar properties to
current feedstocks used to make biofuels. But, while those are cultivated
specifically to produce fuel, spent coffee grounds are waste. Using these,
there's a real potential to produce a truly sustainable second-generation
biofuel," Chuck said.
The research found that there was a reasonably
standard composition and little variation in the relevant physical
properties of the fuels, irrespective of the source.
This means that all waste coffee grounds are a
viable feedstock for producing biodiesel.
The researchers suggest that while coffee
biodiesel would be a relatively minor part of the energy mix, it could be
produced on a small scale by coffee shop chains to fuel vehicles used for
deliveries.
These same delivery vehicles could be used to
collect spent coffee grinds and take them to a central biodiesel production
facility to be processed.
"We estimate that a small coffee shop would
produce around 10kg of coffee waste per day, which could be used to produce
around 2 litres of biofuel," said Rhodri Jenkins, a PHD student in
Sustainable Chemical Technologies and first author of the study.
"There is also a large amount of waste produced
by the coffee bean roasting industry, with defective beans being thrown
away. If scaled up, we think coffee biodiesel has great potential as a
sustainable fuel source," Jenkins said.
The study was published in the ACS Journal
Energy & Fuels.(Courtesy:
deccanchronicle )
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