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Coffee Fuels Us and the National Media

Researchers Read the Coffee Grounds and Find a Promising Energy Resource For the Future

What’s usually considered old garbage might be a promising asset for our energy supply, according to University of Cincinnati researchers.

Date: 9/9/2013 11:30:00 AM
By: Dawn Fuller
Phone: (513) 556-1823
Photos By: Dottie Stover

UC ingot   For many of us, it’s the fuel that wakes us up and gets us started on our day. Now, University of Cincinnati researchers are discovering that an ingredient in our old coffee grounds might someday serve as a cheaper, cleaner fuel for our cars, furnaces and other energy sources.

Yang Liu

Yang Liu, a graduate student in environmental engineering.

Yang Liu, a graduate student in environmental engineering in UC’s College of Engineering and Applied Science (CEAS), presents a summary of early-but-promising discoveries on his team’s research at the American Chemical Society’s (ACS) 246th National Meeting & Exposition this week in Indianapolis.

Liu and fellow researchers Qingshi Tu, a UC doctoral student in environmental engineering, and Mingming Lu, a UC associate professor of environmental engineering, used a three-pronged approach to converting waste coffee grounds into energy sources including biodiesel and activated carbon by:

  • Extracting oil from the waste.
  • Drying the waste coffee grounds after oil removal to filter impurities in biodiesel production.
  • Burning what was left as an alternative energy source for electricity, similar to using biomass.

The researchers launched the project in 2010, gathering waste coffee grounds in a five-gallon bucket from a Starbucks store on UC’s campus. After collection, they removed the oil from the waste coffee grounds and converted triglycerides (oil) into biodiesel and the byproduct, glycerin. The coffee grounds were then dried and used to purify the biodiesel they derived from the waste coffee grounds.

The preliminary results showed that the oil content in the waste coffee grounds was between 8.37-19.63 percent, and biodiesel made from coffee oil meets the ASTM International D6751 standard. The efficiency of using the waste coffee grounds as a purification material to remove the impurities in crude biodiesel, such as methanol and residual glycerin, was slightly lower compared with commercial purification products. However, the researchers report that results still indicate a promising alternative, considering the cost of purification products. Future research will continue to focus on improving the purification efficiency of waste coffee grounds-derived activated carbon.

UC researchers Qingshi Tu, Mingming Lu and Yang Liu.

UC researchers Qingshi Tu, Mingming Lu and Yang Liu.

Compared with petroleum diesel, the cleaner-burning biodiesel reduces the emission of carbon monoxide, hydrocarbons and particular matters (PM).

Waste coffee grounds that result from brewing one of the world’s most popular beverages is estimated to result in more than one million tons per year in the U.S. alone, with the majority of that waste getting dumped into landfills.

The researchers say the method they’re exploring to produce biodiesel would not only open landfill space, but it also holds promise in creating biodiesel from a natural product that’s not also in high demand as a food source, such as corn and soybean crops that are used to manufacture biodiesel.

The project was among four proposals selected for a $500 grant last spring from the UC Invents initiative, an enterprise led by UC Student Government and the UC student chapter of the Association for Computing Machinery to share ideas and encourage innovation in campus life.

UC's Coffee Fueling the Media:

The Guardian

Domestic Fuel

WFSB TV (Connecticut)

Red Orbit

ECN Magazine (for the electronic design community)

UPI (United Press International)

Science Daily

Nature World News

Yahoo News (India)

KFVS TV (Missouri)

WFLX TV (Palm Beach, FL)

Nanonwerk.com

Greenoptimistic.com

The conversation.com

Big News network

Phys.org:

FOX 19:

MedIndia

Ecoseed

FoodProcessing.com (publication for food manufacturing and packaging industry)

Biodiesel Magazine

Canadian Broadcasting Corporation (CBC/Radio Canada)

Strombo.com (Canada)

Ecobooks 4 kids

The Daily Meal

sify news

biospace

Brightsurf

The Atlantic Cities

TruthDive

Better Roads Magazine

Smash Hits (International news site)

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