Yet another study conducted with SCG attempted to extract oil from the grounds and then convert that same oil to biodiesel. Depending on whether it uses Arabica or Robusta coffee, this process yields 10-15% oil. The biodiesel derived from the coffee grounds (100% conversion of oil to biodiesel) was found to be stable for more than 1 month under ambient conditions.
It is projected that 340 million gallons of biodiesel can be produced from the waste coffee grounds around the world. In addition, the coffee grounds after oil extraction also proved to be ideal materials for garden fertilizer, feedstock for ethanol, and as fuel pellets.
The world continues to learn new ways of recycling waste products. An unexpected bonus that most are likely unaware of might be in coffee ground uses. More uses are being found for something seemingly so ubiquitous as coffee grounds. It is heartening to learn how these can be reused for other purposes.
For more on healthy recipes and ingredients, click here.