Turning Used Coffee Grounds into Biodiesel

Now a coffee can be turned into biodiesel. Apparently, Aston University scientists have now produced high-quality biodiesel microalgae that feed on coffee. According to Aston University's statement, this development is also considered a breakthrough in the microalgae breeding system. The results of the study were published in the November 2022 issue of Renewable and Sustainable Energy Reviews.

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About Coffee Grounds-Microalgae-Biodiesel Relationship

According to Aston University, around 98 million cups of coffee are drunk in the UK every day. This results in a large amount of used coffee grounds, which are treated as general waste and often end up in landfill or incineration. However, scientists have discovered that used coffee grounds serve as a structure for microalgae (Chlorella vulgaris sp.) and also as a food source.

As a result, they were able to produce advanced biodiesel with low emissions and good engine performance that meets US and European standards. Until recently, algae was grown on nutrient-free surfaces such as nylon and polyurethane foam. But scientists have discovered that microalgae cells can thrive on leftover coffee without the help of other nutrients.