why is primary treatment called Physical treatment
Answers
Answer:
Primary treatment removes material that will either float or readily settle out by gravity. It includes the physical processes of screening, comminution, grit removal, and sedimentation. The shredded material is removed later by sedimentation or flotation processes.
Explanation:
Primary treatment of sewage basically involves the physical removal of large and small particles, through filtration and sedimentation. This is done in many stages. Initially, floating debris is removed by sequential filtration and then the grit i.e. soil and small pebbles, is removed by sedimentation. All the solids that settle down, form the primary sludge and the supernatant forms the effluent. The effluent from the primary settling tank is further taken for secondary treatment.
Answer:
Explanation:
Primary treatment is known as physical treatment because it include physical removal of solid waste and other substances in the sewage, followed by sedimentation(which settle down grit and other particles).And no chemical processes are involved here.