More good uses for coffee grounds
Coffee grounds offer a cheap, plentiful and sustainable source of biodiesel for fueling cars and trucks, according to Nevada researchers. Spent grounds contain between 11 and 20 percent oil by weight, about the same as traditional biodiesel feedstocks such as palm and soybean oil.
Growers produce more than 16 billion pounds of coffee around the world each year. The used or "spent" grounds remaining from production of espresso, cappuccino, and plain old-fashioned cups of java, often wind up in the trash or find use as soil conditioner. The scientists estimated, however, that spent coffee grounds can potentially add 340 million gallons of biodiesel to the world's fuel supply.To verify it, the scientists collected spent coffee grounds from a multinational coffeehouse chain and separated the oil. They then used an inexpensive process to convert 100 percent of the oil into biodiesel.
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