Peigao Duan, a graduate student, holds a vial of bio-oil made by pressure cooking algae. Unlike fossil fuels, algae-based biofuels are carbon-neutral. A new hydrothermal process starts with less-oily types of algae and eliminates the need for drying, overcoming two major barriers to large-scale conversion of microalgae to liquid fuels. (Credit: Nicole Casal Moore)

U. MICHIGAN (US)—Heating and squishing microalgae in a pressure cooker can speed the oil-making process. Researchers are working to improve the method in an effort to develop affordable, carbon-neutral biofuels.

The University of Michigan team is also examining the possibility of other new fuel sources such as E. coli bacteria that would feed on waste products from previous bio-oil batches.


Researchers heat algae in a device that acts like a pressure cooker to turn the algae into a crude bio-oil. (Credit: Nicole Casal Moore)

“The vision is that nothing would leave the refinery except oil. Everything would get reused. That’s one of the things that makes this project novel. It’s an integrated process. We’re combining hydrothermal, catalytic and biological approaches,” says Phillip Savage, an Arthur F. Thurnau Professor in the chemical engineering department and principal investigator on the project.

“This research could play a major role in the nation’s transition toward energy independence and reduced carbon dioxide emissions from the energy sector,” adds Savage.

Microalgae are microscopic species of algae: simple, floating plants that don’t have leaves, roots, or stems. They break down more easily than other potential biofuel source plants because they don’t have tough cell walls, Savage explains.

Unlike fossil fuels, algae-based biofuels are carbon-neutral. The algae feed on carbon dioxide in the air, and this gets released when the biofuel is burned. Fossil fuel combustion puffs additional carbon into the air without ever taking any back.

The pressure-cooker method the researchers are studying bucks the trend in algae-to-fuel processing. The conventional technique involves cultivating special, oily types of algae, drying the algae and then extracting its oil.

The hydrothermal process this project employs allows researchers to start with less-oily types of algae. The process also eliminates the need to dry it, overcoming two major barriers to large-scale conversion of microalgae to liquid fuels.

“We make an algae soup,” Savage said. “We heat it to about 300 degrees and keep the water at high enough pressure to keep it liquid as opposed to steam. We cook it for 30 minutes to an hour and we get a crude bio-oil.”

The high temperature and pressure allows the algae to react with the water and break down. Not only does the native oil get released, but proteins and carbohydrates also decompose and add to the fuel yield.

“We’re trying to do what nature does when it creates oil, but we don’t want to wait millions of years,” Savage says. “The hard part is taking the tar that comes out of the pressure cooker and turning it into something you could put in your car, changing the properties so it can flow more easily, and doing it in a way that’s affordable.”

Savage and his colleagues are taking a broad and deep look at this process. They are investigating ways to use catalysts to bump up the energy density of the resulting bio-oil, thin it into a flowing material, and also clean it up by reducing its sulfur and nitrogen content.

They’re also examining the process from a life-cycle perspective, seeking to recycle waste products to grow new source material for future fuel batches. This doesn’t have to be algae, Savage says. It could be any “wet biomass.”

The work is funded by the National Science Foundation through the American Recovery and Reinvestment Act.

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