How can i describe wastewater treatment …

• Wastewater Treatment Plant:

The process of wastewater treatment includes the following steps:

1. Screening: This is the first step in which wastewater is passed through bar screens to remove large objects like rags, wood pieces, sticks, stones, etc.
2. Grit and sand removal tanks: Water is then allowed to go into a grit and sand removal tank. This allows the grit, sand, stones and heavy objects to settle at the bottom.
3. Sedimentation tanks: Water is now allowed to pass through large tanks called sedimentation tanks. These tanks are large enough so that organic solid matter like faeces sinks slowly to the bottom and materials like grease and oil float at the surface and skimmed off. The organic solid matter collected at the bottom of the sedimentation tank is called sludge which is continuously removed by scrapers. The sludge collected is sent to separate tanks called digesters where it is broken down by anaerobic bacteria and biogas is released.
4. Aeration: The clarified water is passed into an aeration tank which contains aerobic bacteria. This bacteria rapidly grows and consume organic matter like human and animal wastes and convert it into carbon dioxide. The suspended microbes settle down at the bottom as activated sludge. Water is removed from the top and safely discharged into the rivers or lakes. Sometimes, before discharging into water bodies, water is disinfected with chlorine and ozone to reduce the number of harmful microorganisms that may cause various diseases.