Pharmaceuticals Found in St. Lawrence River

Researchers from the Université de Montréal have found evidence of pharmaceutical drugs half  a kilometer downstream from the Rivière des Praries waste-water treatment plant. The Rivière  des Praries plant, third largest in the world, treats 32 square metres of water per second on  average, and while it is able to remove phosphorus and organic matter it is not adequately  handling drugs and contaminants.
The university researchers have been studying the plant for over five years and found that only  15 to 30 percent of the drugs are removed by the treatment plant. Detected drugs include  antibiotics, antidepressants, and estrogenic compounds. The city of Montreal is currently  working on adding a $200 million ozonation system to the existing plant to deal with the problem.
Source: The Gazette,