Question

Explain the different steps involved during primary treatment phase of sewage.

Answer 1

Primary treatment:

1. In this treatment, filtration and sedimentation process is applied to remove large and small particles.

2. Filtration process removes the floating debris by passing it through mesh wire screens.

3. Then sedimentation removes the soil and small pebbles.

4. The sediment is known as primary sludge and the supernatant is known as primary effluent.

5. The effluent then enters the secondary treatment.