Varying sizes of plastic fragments in five different petri dishes on a countertop.

Steve Techtmann has won the 2021 Future Insight Prize — awarded to innovative research
in health, nutrition and energy — for his food generator concept.

Plastic waste and access to nutritious food top the list of humanity’s challenges.
Yet humans are nothing if not innovative, especially in the face of adversity. Michigan
Technological University’s Steve Techtmann, associate professor of biological sciences, aims to convert plastic waste and inedible
biomass into edible protein — a biological sleight of hand featuring microbes with
a serious hunger.

Techtmann’s groundbreaking research has been awarded the 2021 Future Insight Prize by Merck KGaA, Darmstadt, Germany, a leading science and technology company, along with research collaborator Ting
Lu, professor of bioengineering at the University of Illinois Urbana-Champaign.

Using Microbes and Heat to Transform Plastic into Protein

Techtmann is an environmental microbiologist who studies microbial communities in
diverse natural environments. His lab studies how complex microbial communities can
cooperate to perform functions of industrial interest — in this case, converting waste
into safe and edible food while also tackling the issue of plastic pollution.

“We use engineered natural organisms to break down the plastics and non-edible plant
biomass to convert into food,” Techtmann said. “It is such an honor to be awarded
this prize. This prize will allow us to pursue high-risk and high-reward lines of
research that will enable us to move this work forward more quickly.”

The research was initially funded by a Defense Advanced Research Projects Agency (DARPA) cooperative agreement award
for $7.2 million over four years to refine a method of chemical and high heat (pyrolysis)
deconstruction of plastic waste into protein powder and lubricants. Other researchers
working on the project, titled BioPROTEIN (Biological Plastic Reuse by Olefin and
Ester Transforming Engineered Isolates and Natural Consortia), are Michigan Tech chemical
engineers Rebecca Ong and David Shonnard and materials engineer Joshua Pearce.

Grants and Funding

DARPA grant HR0011-20-2-0033

“The foundation of this research greatly benefited from DARPA’s investment,” Techtmann
said. “The grant from Merck KGaA, Darmstadt, Germany lets us build off that and enables
us to explore other ways to engineer in health benefits by working with probiotics.”

Though Techtmann currently focuses on understanding which microbial communities might
be best-suited to the task of transforming the inedible, the project builds on his
research into the provenance of microbes by studying their biosignatures in bilge water.

Beyond Garbage In, Garbage Out

The first step in converting plastic and inedible plant wastes to protein powder is
to depolymerize the wastes into more biodegradable compounds — that is, break the
polymer into its monomers, or individual, components. The current process converts
plastic into compounds that look somewhat like oil using heat and a reactor that can
deconstruct plastic’s polymer chains. The oil-like compounds are then fed to a community
of oil-eating bacteria Techtmann’s lab has been studying. The bacteria flourish on
their oily diet, producing more bacterial cells, which are about 55% protein. This
lets the team quickly convert plastic to protein.

A person in a white lab coat wearing protective eyewear and a cloth face covering uses a handheld instrument while watching a chemical reaction under a laboratory fume hood.
Ruochen Wu, a chemical engineering postdoctoral researcher, is monitoring the reaction
to break down PET (polyethylene terephthalate, #1 plastic) into soluble products that
can be consumed by a community of microorganisms.

The researchers envision a system like this: There’s a slot on one side where people
throw in plastic waste or non-edible biomass. The waste goes into processing reactors
to be broken down by heat. Once broken down, the byproduct is fed into a vat with
the bacterial community, which chews on whatever flows there and grows. The cells
are then dried down into a powder for later use.

And, as part of the Future Insights prize, the team plans to develop a purely biological
process for plastic conversion into food. This process will use enzymes for depolymerizing
plastics and include bacteria to break down inedible plant biomass and other wastes.

Supercharged Bacteria to Maximize Nutrition

“Nature has provided us with biological systems for coping with many environmental
issues,” Techtmann said. “My role in this project is to identify and grow bacterial
communities from the environment that have the ability to use wastes like plastic,
as well as discover novel enzymes to break down plastics and other wastes more efficiently.”

At Illinois, Lu focuses on engineering microbial gene circuits for novel chemical
and biomolecule production. Working with the team members at Michigan Tech, he aims
to engineer bacteria to enrich the protein powder with maximum nutrition — specific
amino acids and polyunsaturated fatty acids.

In addition, the research team uses synthetic biology approaches to augment probiotics,
improving food quality by increasing nutritional contents, boosting resistance to
foodborne pathogens and adding personalized therapeutic benefits.

Thanks to initial funding from DARPA and the newest infusion of both funding and recognition
from Merck KGaA, Darmstadt, Germany, Techtmann, Lu and their collaborators will continue
to innovate new ways to reduce plastic pollution and bring food to those who need
it most.

Michigan Technological University is a public research university, home to more than
7,000 students from 54 countries. Founded in 1885, the University offers more than
120 undergraduate and graduate degree programs in science and technology, engineering,
forestry, business and economics, health professions, humanities, mathematics, and
social sciences. Our campus in Michigan’s Upper Peninsula overlooks the Keweenaw Waterway
and is just a few miles from Lake Superior.

Leave a Reply

Your email address will not be published. Required fields are marked *