There are various steps involved in the water treatment plant which involves physical, chemical & biological processes:
- Waste water is passed through bar screens to remove big objects like cans, sticks, rags etc.
- The liquid material is then passed through sedimentation tank where solid waste like faecal matter, sand, grit settles down.
- This solid matter is then removed with the help of a scrapper. This is the sludge.
- A skimmer removes the floatable solids like oil, grease etc.
- The clear water so obtained is called clarified water.
- Air is pumped into clarified water to help aerobic bacteria to grow. The bacteria then consume the unwanted matter still present in clarified water.
· The suspended microbes settle at the bottom & the water is removed from the top