Blackburn Wastewater Treatment Plant Upgrade Study

Section 1.0 -Project Background and Objectives
PWWF, m3/d 11 5,000
Flow records for 1998 for the Blackbum WWTP provide the following information:
Population 1,800
Per capita contribution (calculated), Ucapld 250
ADWF, m31d 450
PWWF, m3/d 4,500
The ADWF flow records for lackb bum indicate a very low per capita contribution. It
is likely that of the estimated 1,800 population within the Blackbum sewage collection
area, not all are connected to the collection system. If it is assumed that approximately
75 percent of the Blackbum population, which is 1,350, is connected to the system, the
calculated per capita contribution is 335 Ucapld. For this study, the per capita
contributory flow is assumed to be 350 Llcapld, which is 10 percent lower than the
design value used for the Lansdowne WWTP. Because of the more rural setting of the
Blackburn area; the probable lower use of dishwashershome garburators; smaller
residence size; and, the fact that the sewage pipework is only 25 years old, a 10
percent decrease in per capita contributory flow from 385 to 350 can be rationalized.
The following design flow conditions are assumed for 111 development in the
Blackburn area:
Population 5,000
rn Per capita contribution, LJcapld 350
ADWF, m3ld 1,750
The contribution of flow from the Blackbum sewage collection area at full
development in comparison to the design flow capacity of the Lansdowne Road
WWTP is calculated at less than 5 percent.