Loading...

Microbes in Cow Stomachs Can Decompose Plastic
Cattle may not be the best thing for the climate, but new study shows they could play a role in tackling plastic pollution

July 22, 2021 by Anthropocene
Microbes in Cow Stomachs Can Decompose Plastic
Image by Pete Linforth from Pixabay

This article is by Prachi Patel and was originally published by Anthropocene magazine.

Livestock farming produces a large share of the world’s greenhouse gas emissions, what with cows belching and farting tons of methane. But the ruminants might be unlikely allies in the world’s fight against plastic pollution. New research by scientists in Austria shows that the microbes found in cattle stomachs can break down certain kinds of plastic.

The small building block molecules that are left behind can be reused to make recycled plastics, says Doris Ribitsch of the University of Natural Resources and Life Sciences, Vienna. “We fully believe that microorganisms represent a huge and not fully exploited resource of information that can help us towards a green recycling of synthetic polymers.”

The amount of plastic humans use and discard is growing at an alarming rate. Almost 26 million tons of plastic waste has accumulated in land and marine environments in Europe alone as of 2019, the researchers write in the journal Frontiers in Bioengineering and Biotechnology.

Plastics are polymers: long chains of smaller molecules strung together like beads. While synthetic plastics can last for centuries and harm the environment, natural polymers like cellulose, proteins and silk can degrade. Microbes secrete enzymes that can break down these natural polymers.

And some microbes, it turns out, can also break down synthetic plastics. Researchers have in recent years been on a quest to rein the ability of microbes such as bacteria and fungi to munch and degrade plastics. In 2016, a team found a plastic-devouring bacterium in the mud near a Japanese plastic recycling factory. Others have found plastic-eating microbes at waste disposal sites and oil sites. A French company called Carbios has engineered a bacterial enzyme, originally discovered in a compost heap of leaves, which can break down plastic bottles in hours.

Ribitsch and her colleagues decided to investigate the content of the rumen, a compartment of the cow’s stomach. That’s because microbes in the rumen break down plant matter that cows eat before it goes on to other parts for digestion. Yet not much research has focused on analyzing these organisms and their polymer-degrading enzymes.

The team obtained fresh rumen liquid from a local slaughterhouse that would otherwise go to waste. They incubated this with three types of plastics: PET, used commonly in textiles and packaging); PBAT, a biodegradable plastic used to make compostable plastic bags; and PEF, another biobased polymer. They tested both film and powder forms of each plastic. The fluid broke down all three types of plastics, and the powders degraded faster than the films.

Thousands of microbes—bacteria, fungi and archaea—are found in the rumen. The researchers next plan to conduct further tests to pinpoint which of these bugs are key to the plastic degradation. Then they could identify the enzymes so that they can be made on a larger commercial scale for plastic recycling.


Anthropocene magazine, published by Future Earth,  gathers the worlds’ best minds to explore how we might create a Human Age that we actually want to live in.

Prachi Patel is a Pittsburgh-based freelance journalist who writes about energy, materials science, nanotechnology, biotechnology, and computing. Writes for Scientific American, IEEE Spectrum, Chemical & Engineering News, and MRS Bulletin. Find her at www.lekh.org.


Source: Quartinello F et al. Together Is Better: The Rumen Microbial Community as Biological Toolbox for Degradation of Synthetic Polyesters. Front. Bioeng. Biotechnol. 2021.

In The News

Health

Voting

Environment

Governors Turn to Budgets to Guard Against Climate Change

SACRAMENTO, Calif. (AP) — Their state budgets flush with cash, Democratic and Republican governors alike want to spend some of... Read More

SACRAMENTO, Calif. (AP) — Their state budgets flush with cash, Democratic and Republican governors alike want to spend some of the windfall on projects aimed at slowing climate change and guarding against its consequences, from floods and wildfires to dirty air.  Democratic governors such as California's... Read More

Volcano Erupts in Pacific, West Coast Under Tsunami Advisory

WELLINGTON, New Zealand (AP) — An undersea volcano erupted in spectacular fashion Saturday near the Pacific nation of Tonga, sending... Read More

WELLINGTON, New Zealand (AP) — An undersea volcano erupted in spectacular fashion Saturday near the Pacific nation of Tonga, sending large tsunami waves crashing across the shore and people rushing to higher ground. A tsunami advisory was in effect for Hawaii, Alaska and the U.S. Pacific... Read More

January 6, 2022
by Tom Ramstack
California Wildfires Show Need for Underground Power Lines

WASHINGTON — California fire officials this week accelerated calls for drastic action to confront global warming when they blamed overhead... Read More

WASHINGTON — California fire officials this week accelerated calls for drastic action to confront global warming when they blamed overhead power lines for the second biggest wildfire in the state’s history. The Dixie Fire burned nearly 1 million acres last year, sparked by an overhead power... Read More

December 21, 2021
by Kate Michael
Promoting the Blue Economy to Save the Planet

WASHINGTON — The blue economy is a critical subset of the ocean economy, according to Jason Scorse, director of the... Read More

WASHINGTON — The blue economy is a critical subset of the ocean economy, according to Jason Scorse, director of the Center for the Blue Economy. And while some people may use the terms blue economy and ocean economy synonymously, he and a group of other leaders... Read More

December 20, 2021
by Kate Michael
Could Video Games Save the Oceans Someday?

WASHINGTON — Over 227 million Americans play video games, according to a survey of the Entertainment Software Association. But while... Read More

WASHINGTON — Over 227 million Americans play video games, according to a survey of the Entertainment Software Association. But while people want to play games for fun, industry sees games as a powerful communication tool that can inspire players to take action off the screen, and... Read More

December 9, 2021
by Tom Ramstack
Build Back Better Act’s Benefits Disputed by House Environmentalists

WASHINGTON — With little doubt some version of the Build Back Better Act will win final approval within days, on... Read More

WASHINGTON — With little doubt some version of the Build Back Better Act will win final approval within days, on Thursday a congressional panel discussed how to get the greatest environmental benefit from it. Democrats said that after the infrastructure for more renewable energy is installed,... Read More

News From The Well
Exit mobile version