14 enero 2015
High levels of two potentially hazardous contaminants, ammonium and iodide, have been documented in wastewater being discharged into streams and rivers from oil and gas operations in Pennsylvania. Levels of contamination were just as high in wastewater coming from conventional oil and gas wells as from hydraulically fractured shale gas wells.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/ZZW4Dd6rlWk/150114101631.htm
