OCT 14, 2019 1:44 PM PDT

The bigger picture of biomass energy conversion

While energy production from biomass has gained a fair amount of interest in the last years as a potential option of divesting from fossil fuels, it’s important to understand the whole picture of biomass energy conversation. At least that’s according to a new study published recently in Bioresource Technology Reports from Tony Grift, a professor of Agricultural and Biological Engineering in the College of Agricultural, Consumer and Environmental Sciences and the Grainger College of Engineering at the University of Illinois.

Co-author Grift advocates for taking a wider view of the efficiency of bioconversation, saying that it’s crucial to improving our fossil-free fuel options. "Our goal was to determine how much energy it takes to prepare these materials. It's a comprehensive look at various preprocessing methods and their relationship to conversion efficiency," he explains.

Sugarcane bagasse, a by-product of sugarcane, is commonly used as biomass for energy production. Photo: Pixabay

The study focused on the efficiency of miscanthus giganteus and sugarcane bagasse, both of which are popularly used as biomass for energy production. While miscanthus is known as an ornamental crop, it produces a large amount of biomass and grows easily without much nitrogen so it is a favorite for energy production; sugarcane bagasse, meanwhile, is produced after the sugar is extracted from sugarcane.

Researchers collaborating from the University of Illinois and the University of California at Berkeley analyzed the energy expenditure of harvesting and preprocessing materials, as well as the efficiency of converting the biomass to glucose, which can be made into ethanol fuel. In other words, the researchers wanted to get a good look at not only how much energy is produced, but also how much energy was needed for that production.

To do so, they relied on inherent heating value, or PIHV, which calibrates the amount of energy that goes in and comes out. "It tells you that you have a certain amount of biomass, which contains a certain amount of energy. How much energy do you spend on processing? You don't want to spend more than 5% of the total energy value," Grift says.

One way to get that number down is by reducing the size of the crop that is being transported, a process known as comminution. As Grift explains, "Smaller particle sizes make compression easier. It's also better for energy production, because it provides a larger surface area for enzymes to attach to in the conversion process. But comminution takes a certain amount of energy, so there is a tradeoff."

Understanding which steps of preprocessing expend the most energy may seem like a small part of the equation, but when scaled up, they can have significant impacts in improving efficiency. The researchers say more investigation is needed in order to fully understand how energy production from biomass can best be optimized.

Sources: Bioresource Technology Reports, Science Daily

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
MAY 28, 2020
Earth & The Environment
Are marshes on the Mississippi Delta at a point of no-return?
MAY 28, 2020
Are marshes on the Mississippi Delta at a point of no-return?
A study published recently in the journal Science Advances warns that marshes in the Mississippi Delta are likely to be ...
JUN 28, 2020
Genetics & Genomics
Low-Level Chemical Exposure Causes Heritable Changes in Fish
JUN 28, 2020
Low-Level Chemical Exposure Causes Heritable Changes in Fish
Scientists used a fish called the inland silverside, Menidia beryllina, to show that even small amounts of chemicals tha ...
JUN 30, 2020
Earth & The Environment
Soft coral garden in Greenland needs protection
JUN 30, 2020
Soft coral garden in Greenland needs protection
Research published in Frontiers in Marine Science paper describes the discovery of a soft coral garden in the waters off ...
JUL 15, 2020
Chemistry & Physics
New report analyzes the efficiency of 6 different fiber-catching devices
JUL 15, 2020
New report analyzes the efficiency of 6 different fiber-catching devices
A study from the University of Plymouth International Marine Litter Research Unit has released a report analyzing the ef ...
JUL 18, 2020
Earth & The Environment
Agrochemicals increase the transmission of schistosomiasis
JUL 18, 2020
Agrochemicals increase the transmission of schistosomiasis
Breaking news reports that agrochemicals that pollute our waters also increase the transmission of the parasite that cau ...
JUL 20, 2020
Earth & The Environment
Ectotherm thermal physiology puts amphibians at even greater climate risk than previously recognized
JUL 20, 2020
Ectotherm thermal physiology puts amphibians at even greater climate risk than previously recognized
Things aren’t looking good for amphibians. According to new research published in Global Change Biology from Simon ...
Loading Comments...