Blackburn Wastewater Treatment Plant Upgrade Study

Section 4.0 - Blackburn Treatment Options
Miscellaneous
Blackburn WWTP modifications to allow lagoons
to operate as storage basins, LS 100,000
Subtotal 1,165,000
Contingencies (15 percent) 175,000
EngineerindAdministration (20 percent) 235,000
GST (3 percent) 35,000
TOTAL 1,610,000
4.4 OPTION 4 - TRANSFER ALL FLOW < 2*ADWF TO LANSDOWNE
ROAD WWTP AND USE THE EXISTING BLACKBURN WWTP TO
TREAT FLOWS > 2*ADWF
4.4.1 Outline
In this option all flows up to 2*ADW would be transferred &om the
Blackbum sewage collection area for treatment at the Lansdowne Road
WWTP. The existing sewage lagoons would be used only to treat wet weather
flows > 2*ADWF. A schematic representation of this option is presented in
Figure 4.4. An yI reduction program is to be initiated and completed to reduce
the volume of wastewater being treated in the lagoons during wet weather and
snowmelt conditions. The existing Mackus Road pumpstation would be
upgraded and a new pumpstation constructed to handle excess flow
>2*ADWF. It is believed that the Lansdowne Road WWTP has sufficient
capacity to handle the projected future 2*ADWF hydraulic and BODnSS
loadings f7om the Blackburn sewage collection area. All wet weather flow >
2*ADWF will be pumped to the existing Blackbum WWTP for treatment.
Key activities or capital works associated with this option are as follows:
Implement III reduction program.
Upgrade Mackus Road pumpstation to handle projected increased flows.
Ail dry weather flows < 2*ADWF are to be pumped to Lansdowne Road
WWTP; all wet weather flows > 2*ADWF are to be pumped to Blackburn
WWTP.
Construct trunk gravity sewer and/or forcemain to transfer all flows