Coffee not only powers people, it now also powers home. Dunkin’ Donuts created a transportable home that runs on bio-fuel created by used coffee grounds. And every 170 pounds of spent coffee grounds can yield about one gallon of fuel.
How it works:
- Step 1: Extract excess oils in the spent coffee grounds. There can be natural oils left in spent coffee grounds, all depending on the coffee bean type and original processing methods.
- Step 2: Mix and react. These oils are then mixed with an alcohol to undergo a chemical reaction known as transesterification. This produces bio-diesel and glycerin as a byproduct.
- Step 3: Refine. The bio-diesel is washed and refined to create the final product.
What it’s hot: Finding practical ways to reuse resources and generate energy.