In a paper published in the Journal of Agricultural and Food Chemistry Narasimharao Kondamudi, Susanta K. Mohapatra and Mano Misra Chemical and Materials Engineering, University of Nevada, describe the process to extract the oil from spent coffee grounds and then transesterify the processed oil to convert it into biodiesel.
The researchers say that the production of energy from renewable and waste materials is an attractive alternative to the conventional agricultural feed stocks such as corn and soybean.
The process to extract the oil from coffee grounds yields 10-15 per cent oil depending on the coffee species (Arabica or Robusta).
The biodiesel derived from the coffee grounds (100 per cent conversion of oil to biodiesel) was found to be stable for more than one month under ambient conditions.
It is projected that 340 million gallons of biodiesel can be produced from the waste coffee grounds around the world.
The coffee grounds after oil extraction are ideal materials for garden fertiliser, feedstock for ethanol, and as fuel pellets.
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