2 years ago

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

2 answers:

5 0

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.

USPshnik [31]2 years ago

3 0

the correct answer is the screening of large particles

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