Social Studies
Masako166
21

The first step in the sewage-treatment process is _____.

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Keniayaslin

Primary treatment. In the primary sedimentation stage, sewage flows through large tanks, commonly called "pre-settling basins", "primary sedimentation tanks" or "primary clarifiers". The tanks are used to settle sludge while grease and oils rise to the surface and are skimmed off.

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