Turn Spent Coffee Grounds into Biodiesel

Reader Contribution by Hank Will and Editor-In-Chief
Published on March 25, 2009
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It used to be that we just put used coffee grounds in the compost heap or directly into the garden, but now it seems that used coffee grounds make a great feedstock for making biodiesel. I have just gotten used to the smell of french-fries emanating from the tail pipes of&nbsp; some city buses and a few pickup trucks &hellip; the smell of coffee might be more than I can handle.</p>
<p>According to a&nbsp;<a href=”http://www.sciam.com/blog/60-second-science/post.cfm?id=could-coffee-be-the-alternative-fue-2008-12-10″>study</a>&nbsp;carried out at the <a href=”http://newsroom.blogs.unr.edu/2008/01/18/have-a-cup-of-coffee-recycle-the-grounds-to-curb-global-warming/” target=”_blank”>University of Nevada Reno</a>, coffee, the dregs of most used beverage in the world have value as an oil source for the production of high-quality biodiesel. In an article published in the March issue of&nbsp;<a href=”http://www.biodieselmagazine.com/article.jsp?article_id=3238″ target=”_blank”>Biodiesel Magazine</a>, Susanne Retka Schillthe reports that the concept of using coffee to produce diesel fuel has been around for a few years anyway. It seems that bio-fuel pioneers down in Brazil have been using excess and reject coffee beans to make biodiesel for some time now. The new research indicates that used coffee grounds contain from 11 percent to 20 percent oil that results in a stable, but sulfur-rich biodiesel. In order to meet ASTM standards for on-road diesel fuel, the sulfur needs to be removed first.</p>
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