UW and Agra Energy to convert manure to jet fuel

The University of Wisconsin, Oshkosh, and Agra Energy are operating Wisconsin’s first commercial facility to turn manure into fuel for trucks and jets.

The project started six years ago when Agra Energy searched for waste streams to turn into fuel and that went into existing infrastructure such as tanks, pumps, and engines.

Agra Energy refines biogases produced by landfills, food waste, or manure from Wisconsin farms into fuel. Its technology converts hydrogen and carbon monoxide into a chain of hydrocarbon molecules.

Those are then separated to make diesel and jet fuel – something called the fisher trope process. It is a process used on a large scale by companies like Shell and Arco in countries such as Qatar and Malaysia to ship natural gas, but not by using waste streams.

After a successful pilot facility was built and operated at the university in 2020, the new facility will be running in early 2023.

The process produces diesel and jet fuel but not gasoline. Gasoline needs aromatics which the particular technology of this process does not create, Long said.

Biogas also helps mitigate emissions that would have otherwise escaped from landfills or manure lagoons and contribute to the greenhouse gases that produce climate change. Using the methane these sources produce dramatically reduces its climate impact by converting it into carbon dioxide, according to the World Wildlife Fund.

A lot of the biodigesters in Wisconsin just process the manure, Johnson said. Sometimes, farmers will even just flare, or burn, the gas and not use it at all.

The University of Wisconsin, Oshkosh, has one of the first research-operated digesters in the nation. By having gas-to-liquid systems, many other groups that want to do similar work with biodigesters and renewable biofuel will go to Oshkosh to test their products and ideas, he said.

As the first facility in the state, Johnson is expecting some growing pains to commercialize the fuel with a competitive market. People must realize there is value to biogas, he said. There needs to be buyers.

As a new fuel source, there is a challenge to certifying biofuel as diesel. When diesel is produced, so are equal parts of jet fuel, he said. Jet fuel is harder to certify because a jet could stall in the air.

The goal for the new commercial facility is to make about 1,800 gallons of fuel per day.

There is only so much energy left in the manure after being digested by a cow, which limits the amount of gas available.

Agra Energy has already hired three students out of the university, all of whom have worked on the pilot research and are now employees at the commercial site.