Blackburn Wastewater Treatment Plant Upgrade Study

Section 1.0 - Project Background and Objectives
Discharge flow, m3/d 45,000
The effluent quality must not exceed the above maximums based on a weekly
composite sample made up of four grab samples taken over a two-hour period at
maximum flow. The permit stipulates that although effluent disinfection is not
required at this time, the existing chlorination and dechlorination facilities must be
maintained for use in the event that faecal coliform contamination of water kom the
College Heights well becomes evident in the future.
1.8.3 BC Municipal Sewage Regulations
The BC MOELP has recently published revised Waste Management Act, Municipal
Sewage Regulation, which may have a future impact on updated permits for both
plants. Any plant upgrade after July 15, 1999 will require an application to be made
under these new regulations, which will impact the collection system, treatment and
the effluent discharge requirements, indicated as follows:
No sanitary sewer overflow (SSO) of less than 1 in 5 year return period will be
allowed after January 1, 2004 unless there has been a liquid waste management
plan (LWMP) where the population is > 10,000, or a study where the population is
< 10,000, to quantify and qualify the SSO.
Similarly for Vi, the maximum day flow should not exceed 2 times ADWF unless
there has been a LWMP or study to address the issues.
The aim will be to reduce the SSO's by 10 percent per year.
Where there will be a treatment plant expansion to accommodate an increase in
flow greater than 20 percent of the previous maximum authorized flow, an
environmental impact study will be required.
Any flow above 2 times ADWF will require primary treatment as a minimum, and
primary and secondary emuent should be combined for discharge.
The receiving water would require careful monitoring with a minimum acceptable
40:l dilution ratio. Appropriate discharge locations would need to be identified
that comply with regulations.
The impact of the new Municipal Sewage Regulation on the future upgrading of the
Blackbum wastewater system infrastructure needs to be considered in detail.