The primary treatment of wastewater involves the removal of

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toxic substances

dissolved impurities

stable particles

harmful bacteria

answer is B.

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Detailed Solution

The primary treatment of wastewater involves physical removal of both larger and small particles (stable particles) from the sewage through filtration and sedimentation. These are removed in stages, initially, floating debris is removed by sequential filtration. Then, the grit (soil and small pebbles) are removed by sedimentation.

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