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

Explanation

### Step-by-Step Solution for Primary Treatment Phase of Sewage

1. **Initial Screening**: The first step in the primary treatment of sewage involves the removal of large floating debris. This is done through a screening process where screens or grates are used to filter out large objects such as plastic, wood, and other solid waste materials.

2. **Filtration**: After the initial screening, the sewage water undergoes a filtration process. This step helps in removing smaller particles and impurities from the sewage. The filtration can involve various methods, including sand filters or other types of filtration systems.

3. **Sedimentation**: Following filtration, the sewage is allowed to settle in a sedimentation tank. During this process, heavier particles, including grit (soil and small pebbles), settle down to the bottom due to gravity. This process helps in separating the solid particles from the liquid.

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