Comment Re:Holy Carp! (Score 5, Insightful) 136
Remember that in the early days of penicillin, when manufacturing meant making a couple of grams of the stuff, it was 'recycled' from patient's urine, purified and used again. Many drugs are passed unchanged through the kidney. Many more have only modest changes that might still be biologically active. Standard sewage treatment plants have a relatively haphazard approach to breaking down complex organic molecules of all sorts. If the primary bacteria and flocculation (precipitation) don't get the compound it goes into the drink (so to speak).
UV radiation is pretty good at breaking down things, and even atmospheric radiation (without adding additional UV lights) works to some extent but it is slow and the UV does not penetrate any great deal into the water column. So you either need active UV filtering (something the EPA is pushing) or some other active means of removing organochemicals. Add industrial level effluents and you've got a problem. All of this requires money, time, rule of law and civil commitment. Which means it doesn't always happen - either in China or India or anywhere.