HOUSTON (AP) — Researchers believe they have found an unlikely way to decrease the radioactivity of some hydraulic fracturing wastewater: Mix it with the hazardous drainage from mining operations.
The wastewater is created when some of the chemical-laced water used to fracture thick underground rocks flows back out of the wellbore. The water is tainted with chemicals, toxins and in some parts of the country — such as Pennsylvania — naturally occurring radioactive materials, such as radium. Research has shown that even wastewater that had been treated with conventional means was changing the chemistry of rivers when discharged into waterways.
In 2011, Pennsylvania barred drillers from taking the wastewater to treatment facilities, forcing them to haul the fluid waste to be disposed in underground injection wells in Ohio. This, along with a lack of freshwater in other parts of the country needed to drill new wells, has scientists and the industry looking for creative solutions.
The discovery by Duke University researchers would allow oil and gas drillers to combine flowback waters from the fracking process with acid drainage from mining, or any other salty water. The solids that form, which include radioactive materials, are removed and dumped at a hazardous waste landfill, and then the now cleaner water is used to drill a new well, said Avner Vengosh, the Duke professor who oversaw the project, which included scientists from Dartmouth College and the Technion - Israel Institute of Technology in Haifa.
The metals and radium in the drilling wastewater automatically attract to sulfates — or salts, he explained.
"It's a romance. It's inevitable it will combine," said Vengosh, a professor of geochemistry and water quality.
The research was primarily funded by Duke University, Vengosh said. One of the scientists had some funding from the National Science Foundation, he added.
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