Question
Describe the steps involved in the primary and secondary treatment of sewage water in order to make it suitable for drinking purposes.
Answer :
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The primary treatment of sewage water involves the physical removal of large solids and suspended particles. Initially, sewage water is passed through screens to remove large debris such as sticks, plastics, and leaves. Then, it flows into a grit chamber where sand, gravel, and small stones settle at the bottom due to gravity. After that, the water enters a primary sedimentation tank, also called a settling tank, where suspended organic matter settles down as sludge. This process
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