Creative science projects for class 8 for exhibitions

Wastewater Treatment Plant

Introduction of Wastewater Treatment Plant

A wastewater treatment plant is a process in which a combination of various processes (physical, chemical and biological) are used to treat industrial wastewater and remove pollutants. A waste water treatment plant cleans sewage and water so that they can be returned to the environment. These plants remove solids and pollutants, break down organic matter and restore the oxygen content of treated water. science projects for class 8 for exhibitions

Waste water treatment includes physical, chemical as well as biological processes.

The steps involved in the treatment are as follows:
Screening – Waste water is passed through bar screens. Large and easily visible objects such as sticks, cans,
plastic packets and napkins are removed.Grit and sand removal – Water then enters a grit and sand removal tank.
Water is passed slowly to allow sand, grit and pebbles to settle down.
Water is allowed to settle in a large tank which slopes towards the middle. A skimmer removes the float able solids (e.g. oil and grease).
Water so cleared is called clarified water.