Dr. Martin Dangelmayr (post-doc) and Cullen Meurer (former master’s student) published a cutting-edge technical article titled, Desorption and co-dissolution of uranium-bearing solids during alkalinity enhanced flushing of contaminated sediments, in the journal Groundwater Monitoring and Remediation. The results of this research showed that alkalinity enhanced flushing of uranium could be employed as a viable remediation scheme if calcite precipitation could be minimized in a field application.
Dr. Paradis gave a YouTube livestream webinar titled, Tracking Salt: From Winter Roads to Summer Streams, as part of this year’s Wisconsin Salt Awareness Week. This research is based on Leah Dechant’s master’s thesis that is focused on quantifying the mass discharge of chloride from groundwater to the Root River in Racine, Wisconsin during the summer/non-road salting months.
A new research article titled, Single-Well Push–Pull Tracer Test Analyses to Determine Aquifer Reactive Transport Parameters at a Former Uranium Mill Site (Grand Junction, Colorado), was recently published in the scientific journal Minerals. This research used PHREEQC (geochemistry), PHT-USG (flow and transport), and PEST (calibration) to understand the importance of cation exchange, sorption, and gypsum dissolution on the fate and transport of uranium at a former mill tailings site.
A field tracer study was just published in the Journal of Contaminant Hydrology, titled, “Elucidating mobilization mechanisms of uranium during recharge of river water to contaminated groundwater“. This publication was based on the master’s thesis of Kendyl Hoss (link to the Hoss thesis HERE). This publication demonstrated that solid-phase uranium, in equilibrium with aqueous-phase uranium, may not be readily mobilized when recharged with uranium-free water, i.e., concentration-dependent uranium desorption and/or dissolution may be a very slow process; this has implications on the time it may take for uranium to flush from a contaminated site.
The Paradis Lab was awarded $350,000 by the NSF to research the biogeochemical mechanisms that are likely responsible for enhanced flushing of uranium during oxygen- and carbonate-rich well injections. Details of this award can be found at the NSF Awards website at this LINK. This research is in collaboration with Dr. Majumder at UW-Madison who also received an NSF award (LINK).
Rakiba Sultana (PhD student) and Leah Dechant (MS student) were awarded $2,700 and $2,378, respectively, in support of their graduate research projects for the summer of 2022 by the Geological Society of America. Rakiba’s research proposal is focused on the mobility of uranium in groundwater. Leah’s research proposal is focused on the transport of road salt from groundwater to surface water.
Matao Casarez won best poster in the 14th Annual Undergraduate Research Symposium at UWM with the project titled, “Lithium Metal Recovery from Permian Basin Produced Water“. This research showed that produced water was several times saltier than sea water and contained subtaintial amounts of the critical metal, lithium.
UW-Milwaukee assistant professor Charlie Paradis is studying how that road salt impacts waterways in our area. “We suspect that there’s a subsurface component that is storing road salt over the summer months,” he explains. LINK TO FULL STORY
Students from the University of Wisconsin-Milwaukee (UWM) are helping the Office of Legacy Management (LM) evaluate sources of groundwater contamination at LM’s Riverton, Wyoming, Processing Site. See LINK.