During the primary treatment of sewage,solid | vedclass

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(C) Primary or physical treatment of sewage involves the physical removal of large and small particles from sewage.First,floating debris is removed by

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Primary sludge

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(C) Primary or physical treatment of sewage involves the physical removal of large and small particles from sewage.First,floating debris is removed by sequential filtration using wire mesh screens.Then,grit (soil and small pebbles) is removed by sedimentation in a settling tank.The sediment that settles down is called primary sludge,and the supernatant liquid is known as the effluent.

During the primary treatment of sewage,solid particles that settle down are called

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