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treated and untreated sewage
Yes, it is one of the main. There is a lot of untreated sewage.
Untreated sewage is waate product from factorries, nuclear facillities and untreated human waste. This waste is highly dangerous as it contains bacteria, virus, etc... This waste if mixed with river water or water system can cause large damage not just to human but aquatic life aswell. Treated sewage is sewage which is filtered and treated with chlorines and other chemical, after the process the water is ready to be mixed with river, etc. This water is even ready to drink.
Sewage, particularly untreated sewage, contains a lot of bacteria, and that bacteria can infect fish and kill them.
I believe it is known as effluent
Down the sewers to the sewage treatment plant, just like when we flush the toilet or take a shower or brush our teeth or wash our hands. In many cities runoff from the streets also goes into the same sewers, but as heavy rains can cause the sewage treatment plant to overflow and allow untreated sewage out, there is often a separate sewage system for this that does not go to the sewage treatment plant.
One of the main concerns of dumping untreated sewage is bacteria levels. Sewage is teaming with bacteria far above a safe level. When this is poured into a river it can create many problems. Some of the most prominent are that it makes the water dangerous swim in and it makes the water undrinkable. Also, it can kill the plants and animals living in the river and make the remain life sick and dangerous to eat because of the bacteria and parasites that once lived in the sewage and now live in the fish.
C. Treated sewage is less damaging to the environment than untreated sewage
Pollution on the thames can be caused by the storms that caused 600,00 tonnes of untreated sewage into the thames.
Sewage
Sewage treatment is an essential process in a more advanced society. Untreated sewage can reenter the water system and spread disease. Land around a sewage treatment plant would be cheap, as it is a less desirable area to live, because of the bad smell.