Primary treatment of sewage is the:

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(A) Primary treatment of sewage involves the physical removal of large and small particles from the sewage through filtration and sedimentation. $1$.

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physical removal of large and small particles from sewage

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(A) Primary treatment of sewage involves the physical removal of large and small particles from the sewage through filtration and sedimentation. $1$. Filtration: Floating debris is removed by sequential filtration. $2$. Sedimentation: Grit (soil and small pebbles) is removed by sedimentation. All solids that settle form the primary sludge and the supernatant forms the effluent. This process does not involve any biological or chemical treatment.

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