The February 2026 Mound Tech Talk is. . .
"Use of Phosphgypsum Residues for Purposes Such as Roadbeds" by Catesby Mallard
This Tech Talks will be available on Zoom with a watch party at 1075 Mound Road on February 25, 2026 at 7pm.
Biography: Catesby Mallard is a master’s student in the University of Alabama at Birmingham’s (UAB) Health Physics program in her final semester, about to defend her thesis. She currently works as the UAB’s Health Physics Lab manager and has had experience researching the development of radiopharmaceuticals and as a health and safety specialist with Environmental Health and Safety.
Topic: The phosphate fertilizer industry, while integral to agriculture, continues to produce staggering amounts of phosphogypsum (PG), an acidic and hazardous waste byproduct concentrated with heavy metals, radionuclides, and other toxic elements.
Due to the potentially harmful emission of radon from PG, the disposal of PG in engineered stacks, regulated for nearly four decades, is no longer a tenable approach. In search of a more viable solution, alternatives such as recycling PG are being researched across the world.
One promising approach explores the reuse of PG as a road construction material. With approximately 9 million lane miles of public roads in the US, incorporating PG into future road
construction could serve as a long-term solution to not only dwindle the current storage, but also recycle the future production of PG.
The EPA has approved a small-scale pilot PG-based road study in Florida. This paper examines the possibility of the future implementation of PG-based roads nationwide across the US. This research has studied state-specific regulations, site-specific environmental implications, best practices for future use, and long-term performance of PG-based roads to compare and complement the current pilot approval and navigate future practical hurdles industry may encounter as they incorporate PG
into US road systems.
ZOOM INSTRUCTIONS:
Time: Log-on Feb 25, 2026 between 6:30 PM - 6:55 PM EST (Log-on closes at 7:00 PM when talk begins)
Join Zoom Meeting:
https://us06web.zoom.us/j/83029110866?pwd=Dx2ySNYraIJMU76eaOnr5PAmf0UxRX.1
Meeting ID: 830 2911 0866
Passcode: 091074
Join instructions:
https://us06web.zoom.us/meetings/83029110866/invitations?signature=SBCVzJzVvEEGyF1BVYGfOZ-7yfNPVdkAwN-8nBoOEMc
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