Blackburn Wastewater Treatment Plant Upgrade Study

Section 4.0 - Blackbm Treatment Options
4.3 OPTION 3 - USE EXISTING BLACKBURN WWTP FOR
EQUALIZATIONlSTORAGE AND TRANSFER ALL FLOWS TO
LANSDOWNE ROAD WWTP
4.3.1 Outline
In this option the existing sewage lagoons would be converted to flow
equalizationktorage basins, and all flows transferred for treatment at the
Lansdowne Road WWTP. A schematic representation of this option is
presented in Figure 4.3. The principal benefit of this option is that the peak
flows being transferred from the Blackburn sewage wllection area to the
Lansdowne Road WWTP would be attenuated somewhat. An VI reduction
program is to be initiated and completed to reduce the volume of wastewater
being transferred during wet weather and snowmelt conditions. The existing
Mackus Road pumpstation would be upgraded. It is believed that the
Lansdowne Road WWTP has sufficient capacity to handle the projected future
hydraulic and BODflSS loadings from the Blackburn sewage wllection area.
Key activities or capital works associated with this option are as follows:
Implement L'l reduction program.
0 Modify lagoons for use as flow equalizatiodstorage basins.
0 Upgrade Mackus Road pumpstation to handle projected increased flows.
Construct trunk gravity sewer to transfer all flows ihm Blackburn
sewerage area to Lansdowne Road WWTP.
Upgrade downtown sewage collection system to handle increased flows
from Blackburn sewerage area.
Key technical issues assmiated with this option are as follows:
Extent to which the I/I reduction program is able to reduce peak wet
weather flows must be evaluated.
City must maintain operation of storage basins; O&M costs of
equalizatiodstorage basins are only slightly lower than O&M costs for the
existing treatment lagoons.
Major capital works needed to transfer flows to Lansdowne WWTP and
modify lagoons.