Researchers at the University of Illinois have come up with a way to turn swine manure into a biocrude oil, as well as growing algae biomass, capturing carbon, purifying wastewater and recycling nutrients. This news release from the school says Yuanhui Zhang and Lance Schideman, both professors in the Department of Agricultural and Biological Engineering, have combined their years of research for the innovative development.
“We first convert swine manure into crude oil in a hydrothermal liquefaction reactor,” Schideman said. “There is a very strong wastewater that comes off that process. It contains nutrients that can be used to grow algae that simultaneously clean the water. Lately, we’ve added low-cost, bioregenerable adsorbents into the system that allow us to grow additional bacterial biomass and further improve effluent water quality.
“Our recent research, a combination of experimental work and some computer modeling, has shown that we can reuse the nutrients multiple times and thus amplify biofuel production from waste feedstocks,” he explained. “If we start with a particular waste stream that has one ton of volatile solids in it, we might be able to produce three, five or even ten tons of algal and bacterial biomass. This new biomass is then recycled back into the biofuel production process,” he continued. “It can also clean the water with the goal of making it suitable for environmental discharge or reuse in some other application. So we get more bioenergy and more clean water resources – both good things in the long run.”
The biocrude oil has higher oxygen and higher nitrogen content than traditional petroleum, but lower sulfur content. The researchers see the process helping bridge the gap between the smaller refineries and petroleum’s requirements of having refineries that process hundreds of thousands of barrels of material each day.
The biocrude oil is being tested as an asphaltic binder in a piece of pavement leading to Six Flags St. Louis.