Question

what is need to treat wastewater

Answer 1

We need to treat wastewater because when it will go to sea or an ocean it can pollute it a lot causing disturbance in marine life and it encourages disease growth ...Due to waste water a lot of animals breed which can cause severe diseases to us ...Such as mosquito which can cause dengue ..
These were some points for which waste water should be treated well

Answer 2

Hey mate here's your answer^_^

We are needed to treat wastewater because after the removal of harmful or waste solids from the wastewater treatment, We will get pure water which is called effluent,to use that water in the future.

Hope it'll help you ✌️✌️