How to make a Sewage Treatment Plant?

Wastewater Treatment plant takes the runoff from the showers, street drains, washing machines, sinks, and toilets to make it safe and clean again before releasing it back into the environment. Sewage treatment includes multiple steps and processes at the plant for making it safe and clean.

Source Ur: https://clear-ion.com/blog/how-to-make-a-sewage-treatment-plant-at-home/