CHRIS KNAPTON / SCIENCE PHOTO LIBRARY CHRIS KNAPTON / SCIENCE PHOTO LIBRARY
Treated sewage water outlet. View of treated sewage water being pumped back into a river. Sewage is water contaminated with mainly organic waste. Returning it directly to the environment can have disastrous consequences for wildlife, so the sewage is treated to clean it. This involves allowing bacteria to break down the organic waste, and the water is also filtered several times, and left to settle. At the end of the process, the clean water is returned to the rivers. Several water birds are seen downstream from the outlet, reflecting the treated sewage's high nutritional content. This is the River Trent, in England.
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