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(C) The removal of physical particles from sewage is known as primary treatment.Primary treatment involves two main steps:$1$. Sequential filtration:

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$(i)$ and $(iii)$

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(C) The removal of physical particles from sewage is known as primary treatment.Primary treatment involves two main steps:$1$. Sequential filtration: This removes floating debris.$2$. Sedimentation: This allows grit (soil and small pebbles) to settle down.These steps are purely physical processes. Biological treatment is part of secondary treatment,and chlorination is a tertiary treatment process used for disinfection.

Which processes are used to remove physical particulate matter from sewage water?
$(i)$ Filtration
$(ii)$ Chlorination
$(iii)$ Sedimentation
$(iv)$ Biological treatment

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Which processes are used to remove physical particulate matter from sewage water?$(i)$ Filtration$(ii)$ Chlorination$(iii)$ Sedimentation$(iv)$ Biological treatment