By which process is sludge formed?

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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 sedimen

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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.$1$. Filtration removes large debris.$2$. Sedimentation allows the grit (soil and small pebbles) and all solids that settle to form the primary sludge.Therefore,sedimentation is the key process responsible for the formation of sludge.

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