Urban waste water treatment (UWWT) is key to protecting environment and human health. The investment in UWWT is substantial, with a planned lifetime of many decades. Urban waste water treatment plants (UWWTPs) receive waste waters from many upstream sources but act as a point source, from where pollutants can enter rivers, lakes and coastal waters. Treatment taking place at UWWTPs represents the last chance to prevent pollutant releases into sewers reaching the environment.
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"from where pollutants [that have not been removed by the treatment already in place] can enter rivers, lakes and coastal waters."
I am not sure if here is the right place - but we should not forget to consider stormwater overflows or comined sewer overflows - they can contribute almost half of the wastewater received by the respective rivers ... but one has to say literature on this is still scarce ...
best
Thomas