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  • 13-03-2017
  • Social Studies
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The first step in the sewage-treatment process is _____.

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devin73010
devin73010 devin73010
  • 13-03-2017
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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