showsa schematic diagram of the pla

shows
a schematic diagram of the plant. It consists of a
rotary screen for large solids and grass removal,
the 1st dissolved air flotation unit, a contact tank,
aeration tank, coarse air blowers (3530 m3/h),
polymer makeup tank and the 2nd dissolved air
flotation unit with suction sludge withdrawal. Four
200-hp multistage centrifugal blowers provided
air.