Primary treatment is the physical process that can removes the large amount particles with a screen.
The purpose of the primary treatment is that to settle the material by the gravity, removing the floatable objects, and also reducing the pollution to the ease and the secondary treatment. Primary Treatment is aims to reduce the Biochemical Oxygen Demand (BOD) and the Total Suspended Solids (TSS) in wastewater.
The Primary treatment is the sewage and the treatment that involves the physical removal of the particles (large and the small) from the sewage through the filtration and the sedimentation. Initially the floating debris is also removed by the sequential filtration. Then the grit (soil and small pebbles) are also removed by the sedimentation.
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Answer/Explanation:
Natural selection is caused naturally when species have babies that are better at preventing threats. In this occasion of giving live birth it was naturally selected to prevent predators from eating eggs. When the babies were born alive they could run instead of being helpless.
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Answer:
isotonicity
Explanation:
If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.