Sewage Plants Struggle To Treat Wastewater Produced By Fracking Operations | Chemical & Engineering News
To learn more, Kyle J. Ferrar, a graduate student at the University of Pittsburgh, and his colleagues analyzed water from treatment facilities that initially processed fracking water and then later complied with the states recommendation. They took water samples from one private and two public facilities in Pennsylvania that treated water from the nearby Marcellus Shale region, the largest shale basin in the U.S. They collected samples both before and after the departments request.
Using a variety of spectroscopic techniques, the team measured levels of chemicals found in gas production waste but arent typically present in other industrial wastewaters. Although levels of these chemicals varied widely among the three treatment plants, in general, concentrations dropped significantly after the plants stopped taking the fracking waste, Ferrar says. For example, at a municipal plant in Greene County, average barium concentrations fell from 5.99 to 0.14 mg/L.
But when the plants still handled the waste, levels of several of the chemicals exceeded drinking water standards set by the U.S. Environmental Protection Agency. At the Greene County plant, the levels of barium and strontium, two toxic metals found in fracking wastewater, were on average 5.99 and 48.3 mg/L, respectively. EPA drinking water standards for these metals are 2 and 4 mg/L, respectively.