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Home NEWS Science News Science

Seeking sustainable solutions for Nashville’s organic wastes

Bioengineer by Bioengineer
July 12, 2019
in Science
Reading Time: 3 mins read
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University of Tennessee collaborates with Resource Capture on $40,000 grant

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Credit: Tennessee Dept. of Tourist Development

KNOXVILLE, Tenn. – An interdisciplinary team of researchers from the University of Tennessee has been awarded a $40,000 grant to collaborate with the nonprofit Resource Capture to develop a more sustainable way to manage the booming Nashville metropolitan area’s organic wastes and, in the process, provide a valuable soil amendment for the region’s farmers.

The Nashville metropolitan area has experienced tremendous growth in recent years and is struggling to manage its organic waste. Currently, organics (food scraps, woody waste, yard waste and some industrial waste) comprise around 32% of its residential waste and 19% of its commercial waste. The vast majority of this waste, mostly food, is sent to a landfill in nearby Rutherford County that is scheduled to close in the next five to 10 years.

In the landfill, organic waste breaks down, emitting methane – a greenhouse gas up to 80% more potent than carbon dioxide. In fact, more than 14% of the methane in the atmosphere is a result of organics decomposing in landfills.

Project partner Resource Capture has proposed using anaerobic digestion (AD) – the natural process in which microorganisms break down organic materials – as an alternative technology for diverting and managing organic wastes. The AD technology has been used successfully in Europe for many years; however, it is not commonly used in North America. The research project will help to optimize the process for the Nashville metropolitan area.

The material that is left over following AD is nutrient rich and can be sustainably used as a soil amendment. One component of the project will involve designing an applied research and education program to promote economic and environmentally responsible use of the digester output on agricultural operations. In addition, researchers will identify cost-effective facility locations and estimate potential economic impacts of constructing and using anaerobic digesters to treat Nashville’s food waste.

“We believe that by diverting and digesting organic waste with a project like the one proposed by Resource Capture, we can decrease demand for landfill space, reduce methane emissions and create jobs in the local community,” said Christopher Clark, professor of agricultural and resource economics and project co-leader. “Additional benefits of using the compost-like material include improved soil fertility and increased farm profitability,” he said.

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The grant is funded by UT’s Institute for a Secure and Sustainable Environment. The interdisciplinary project team is comprised of researchers from the UT Institute of Agriculture and the UT Knoxville Tickle College of Engineering, College of Law, and the Howard H. Baker Jr. Center for Public Policy. The members of the research team include:

  • Agricultural and Resource Economics: Chris Clark, Burt English, Chad Hellwinckel and Edward Yu
  • Biosystems Engineering and Soil Science: Shawn Hawkins and Forbes Walker
  • Civil and Environmental Engineering: Qiang He
  • College of Law: Becky Jacobs
  • Economics and Baker Center for Public Policy: Charles Sims

Through its mission of research, teaching and Extension, the University of Tennessee Institute of Agriculture touches lives and provides Real. Life. Solutions. ag.tennessee.edu.

Media Contact
Patricia McDaniels
[email protected]

Original Source

https://ag.tennessee.edu/news/Pages/NR-2019-07-09.aspx

Tags: AgricultureBiologyBiomedical/Environmental/Chemical EngineeringFertilizers/Pest ManagementPlant SciencesPollution/RemediationUrbanization
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