What is primary sludge?

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Question

(B) In the process of sewage treatment,the primary treatment involves the physical removal of particles from the sewage through filtration and sedimen

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Solids removed by sedimentation

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(B) In the process of sewage treatment,the primary treatment involves the physical removal of particles from the sewage through filtration and sedimentation.Initially,floating debris is removed by sequential filtration.Then,the grit (soil and small pebbles) is removed by sedimentation.All solids that settle down form the primary sludge,while the supernatant forms the effluent.

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