Old Fryer Grease Could Fill Your Gas Tanks
The leftover grease used at University dining halls could be more useful than you think.
Researchers at the University of Kansas hope to discover a way to implement the waste product to produce biodiesel, a fuel that is safe for the environment but expensive to purchase.
As of now, the University throws away 7,000 gallons of waste oils from the dining services per year. According to Ilya Tabakh, graduate research assistant and member of the Student Senate, the amount of waste product would be enough to produce fuel for all the campus buses, lawnmowers and other campus vehicles.
Traditionally, biodiesel is made from new or used soybean oils or animal fats. Once the fat is filtered, it is heated and mixed with an acid and base. Once let to sit, it is combined with petroleum so that it can be used as fuel.
Because refined oil or new/filtered oil is expensive, the cost of biodiesel is too costly for University use. Instead, KU uses a cheaper, non-environmentally friendly diesel fuel.
The associate professor of chemical and petroleum engineering, Susan Williams, believes it is more economical to look at the used grease from places such as Mrs. E’s or the Underground, which is free, to produce biodiesel. This would ultimately create a fuel that is less expensive and good for the ecosystem.
“Currently the University pays to have the grease hauled off,” Williams said. “It makes sense to put the cheaper feedstock to good use instead of using the expensive refined oil.”
In order to transport grease off-campus, the University must pay thousands of dollars per year. If the cost of transporting grease was taken away, that money could be used to convert on campus grease to biodiesel instead, costing the University a similar cost while being more friendly to the environment.
Williams and her research team began discussing a student-run manufacturing plant three years ago after receiving funding for on-campus work. Before implementing their plan, they knew there needed to be a student interest in the project. Once student senate member Ilya Tabaka approached them with the same idea, they knew they were ready to begin thought processes for the plant.
“When Ilya approached us with his idea, it was the perfect time,” Williams said. “It was the merging of research and student interest.”
Still in what they call “Stage 1,” Williams and her researchers are trying to decide on a budget for a small, on campus building in addition to materials and machines they would need.
The cost of this project is still being calculated, but an estimate is said to be released by the middle of next spring, when they submit a proposal.
For now, Williams and her team receive funding from theCEBC or Center for Environmentally Beneficial Catalysis who provides money for the use of Carbon Dioxide, which increases the reaction, yielding more biodiesel.
“Once we get the proposal out, the rest will come pretty quickly,” Williams said. “It’s the first step to making our dream a reality.”
Tabakh, who is also a member of the Transportation Research Institute, an institute that addresses “contemporary transportation issues and their social and environmental consequences” has talked to the Environmental Advisory Board of Student Senate and has received a gauge of what they could do financially.
“The project has been really well-received so far by the student senate,” Tabakh said. “As far as funding goes, we’re planning to look into sources on campus.”
Tabakh couldn’t release an exact amount of money they would receive for funding, but this year, the Transportation Research Institute received $14.5 million for research in transportation related issues. Williams and Tabakh said they would also turn to student senate for their project funding.
Only two Universities, Clemson (located in South Carolina, approximately 128 miles from Atlanta) and Iowa State, are conducting similar research. As of yet, no one has strived to put a manufacturing on campus.
“There aren’t a lot of people who are doing a full fledged research facility,” Williams said. “This center will be a place to implement new technologies on a smaller scale.”
William’s research group plans to use the new facility to uncover cheaper, more efficient ways to produce biodiesel. With a center on campus, the group could experiment with waste oil to find out if it is as effective as refined oil.
Campus buses currently use B5 fuel or 5 percent biodiesel because it runs about $2.97 per gallon while B100 or 100 percent biodiesel runs about $3.76 per gallon. Although buying B100 in bulk is cheaper, it is not cheap enough. Williams hopes her research will produce less expensive fuel that doesn’t harm the environment.
“We have three goals for this project,” Williams said. “To make the processes more efficient, make the product more economical and make it easier to produce.”
In William’s current research, converting waste oil to biodiesel is a slower process because of the use of a solid acid such as Amberlyst instead of a typical liquid acid, which is toxic such as sulfuric acid. To make the process more efficient, her researchers would experiment ways to make the reaction faster.
Williams did not say how much money their product could save the University, but said the absence of cost of refined oil would be a significant savings.
To create biodiesel, the researcher must take animal fats or soybean oil and mix them with an alcohol (methanol) and a base (sodium hydroxide or potassium hydroxide). From there, the substance is heated and stirred at 50 C. Once it is left to sit, it creates a three layer liquid substance with biodiesel at the top. Un-reacted oil, or oil that did not become biodiesel, lies below the biodiesel with water at the bottom. (see picture)
In order to separate the biodiesel from leftover oil and water, the researcher must extract it using a pipette.
“The problem with the separation process is it is easy to pull out some of the un-reacted oil in the pipette when removing the bio diesel,” Williams said. “If un-reacted oil gets in your gas tank, it will turn into a Crisco-type substance.”
The oil used from university fryers would have to be stripped of all solids before going through the conversion process. Once bio diesel is made, it is combined with petroleum diesel before it is put into cars.
“Eventually we hope to use B100, but as of yet many engines are not warranted for this,” Williams said. “This process is so new; we’re not sure how cars react to this new kind of fuel.”
Not all vehicles can use biodiesel fuel. Any vehicle that is older than mid-90s should have an upgrade on fuel lines in order to use the fuel.
Tabakh believes that if the research facility opens, researchers will work to make biodiesel into a better product with a more effective process. For now, they continue to work with new methods make their methods safer for the environment.
“To accelerate a chemical reaction, a catalyst must be used,” said Jonathan Allison, a senior in Chemical Engineering and research assistant to Williams.
The use of a catalyst ultimately yields more biodiesel, creating fewer waste materials. By making small changes such as these, research assistants can produce a more environmentally safe product.
“It’s really exciting to think we could have a full functioning facility that’s producing,” Williams said. “A center like this on campus would give students a chance to have first hand experience and be able to work with some of their peers who may not be part of the research departments.”
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