Multiple choice

The first step of sewage treatment is ______.

  1. precipitation

  2. chlorination

  3. sedimentation

  4. aeration

  5. eutrophication
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sedimentation is a physical water treatment process using gravity to remove suspended solids from water. Solid particles entered by the turbulence of moving water may be removed naturally by sedimentation in the still water of lakes and oceans. Settling basins are ponds constructed for the purpose of removing solids by sedimentation. Clarifies are settling basins built with mechanical means for continuous removal of solids being deposited by sedimentation.

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