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Question

Describe various steps of cleaning wastewater in a wastewater treatment plant.

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Solution

The following steps are followed​
- Screening​
First, with the help of bar Screens, the wastewater is filtered for ​large objects/impurities like sticks, ​rags, cans, plastic packets, etc.​

​- Grit removal​

The filtered water is slowly moved into a grit settling tank where sand, grit and pebbles are allowed to settle down.​

​- Primary sedimentation​
The water is passed to a large tank having a slope where solid waste like faeces is scraped after settling and surface impurities like oil and grease are skimmed.​

- Aeration​
The cleared water is aerated for aerobic bacterial growth.​

​- Secondary sedimentation​

The water is left undisturbed for several hours till suspended microbes settle at the bottom of the tank as activated sludge.​

​- Chlorination​
Chlorine is added to disinfect water.


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