New Process Will Help Reduce Diesel Consumption and Greenhouse Gas Emission
Researchers are converting wet, solid biowaste, such as manure from pig farms, into liquid fuel that can be blended with regular diesel.
05/24/2019
By Edwin L. Aguirre
A team of researchers from 51视频, the University of Illinois at Urbana-Champaign and China Agricultural University in Beijing has developed a new, sustainable way of converting wet biological waste into diesel-compatible fuel, using heat and water.
The process, called hydrothermal liquefaction (HTL), converts wet, solid biowaste 鈥� such as animal manure from farms, food scraps from restaurants and food-processing plants, and algae from wastewater treatment facilities 鈥� into liquid fuel that can be blended with regular diesel.
鈥淭his process is environmentally sustainable, and has the potential to augment the country鈥檚 energy production while reducing greenhouse gas emission,鈥� says UML Plastics Engineering Asst. Prof. Wan-Ting (Grace) Chen, who is a member of the team.
Each year, the United States produces nearly 80 million tons of wet biowaste. Worldwide, the amount of biowaste produced is expected to climb due to urbanization, industrialization and population growth.
鈥淭he World Bank has projected a 70 percent global increase in urban waste and an 83 percent increase in disposal cost by 2025, based on current waste-disposal technologies such as incineration and landfilling,鈥� notes Chen. 鈥淔inding an effective means of repurposing biowaste into a resource is key for a sustainable future.鈥�
According to Chen, the renewable fuel blend currently has comparable performance to diesel in terms of combustion efficiency and carbon emission profile. The researchers are to fully understand the effects of HTL blends on combustion characteristics, including the introduction of additives to further reduce the blends鈥� pollutant emission levels. Their ultimate goal is to patent the technology so it could be applied on a commercial scale.
The team鈥檚 initial findings were published on Nov. 13, 2018, in the journal .
From Biocrude Oil to Diesel Blendstock
According to Chen, biocrude oil, which is converted directly from wet biowaste using the HTL process, produces a comparable amount of heat to petroleum crude oil (about 75 to 90 percent). However, to commercialize the production of biocrude oil as transportation fuel, it has to comply with current standards and specifications for diesel fuel and engine emission.
Image by Katharine Webster
Plastics Engineering Asst. Prof. Grace Chen is seen here with honors plastics engineering major Greg Reimonn, who works in her lab to study microplastic mitigation and recycling.
Engine tests performed by Chen鈥檚 team 鈥� using 10 to 20 percent upgraded distillates blended with diesel 鈥� showed a power output of 96 to 100 percent.
鈥淥ur research showed that distillation plus esterification provides a higher energy recovery ratio and lower greenhouse gas emission than conventional fuel-upgrading methods such as hydrotreating, which uses high-pressure hydrogen gas to remove oxygen, nitrogen and sulfur in crude oil,鈥� she says.
The team鈥檚 research project was funded through endowments from a bioenergy startup company, fellowships and a grant from the U.S. Department of Agriculture and the U.S. Department of Energy.