Select the correct sequence of events in a sewage treatment process.
A. Passages of primary effluent into large aeration tanks for mechanical agitation and pumping or air .
B. Passage of effluent into the settings tank and formation of activated sludge.
C. Physical removal of particles thought filtration and sedimentation .
D. Release of effluent from the secondary temperature plant into natural water bodies.
E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.

Options

A. A,C,B,E,D
B. A,B,C,D,E
C. C,A,E,B,D
D. C,E,A,B,C

Answer

C