Blackburn Wastewater Treatment Plant Upgrade Study

Section 4.0 - Blackburn Treatment Options
the clarifier discharges directly to the river. The settled sludge is pumped back
to the aeration basins at a rate approximately equal to the influent ADWF.
Excess sludge is wasted from the return activated sludge and diverted to a vault
where it is allowed to settle further. The supernatant from this vault is decanted
back to the plant headworks. Thickened sludge is transported off-site for
disposal.
Non-nitrifying bioreactor
HRT, h
SRT, d
Anoxic cells
Volume (anoxic cell), m3
Power (anoxic cell mixer)!hp
Aerobic cells
Volume (aerobic cell), m3
Plan dimensions, m
SWD,m
MLSS, mglL 2,200
Type of aeration
Blowers
Power (aeration blowers), hp
fine bubble dif!%sers
2
40
Mixers (aerobic cell)
Power (aerobic cell mixers), hp
Waste activated sludge storage
Waste RAS (@ 8,000 ma), m3fd
WAS storage capacity, d
Volume (WAS tank), m3
Plan dimensions, m
SWD,m
WAS tank aerator
Power (tank aerator), hp
Secondary Clarifiers
Secondary clarification is required to remove the bulk of solids !?om the mixed
liquor before final discharge, and to return the separated biological solids to the
bioreactor. The secondary clarifiers will be sid to process 50 percent of
ADWF each at a relatively low overflow rate, thereby allowing one to be taken