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Mill Springs WWTP, Mill Bay, BC

Case Study 

This residential subdivision advanced wastewater treatment plant is to serve initially 60 and ultimately 400 residences and a school. Since the effluent is discharged in the vicinity of an aquifer, Class A reclaimed water quality effluent was stipulated: BOD5, TSS and Total Nitrogen of less than 10 mg/l, median fecal coliform of less than 2.2/100 ml and average turbidity of 2 NTU.



The system consists of coarse bar manual screen, USBF clarifiers, microscreen, sand filters and UV disinfection. It includes two bioreactor modules and a provision has been made for future modular expansion.

Phase 1 of the plant was built in 1998 but due to delay of the residential development it was started up in May 2002. Phase 2 was completed in 2004 and Phase 3 in 2005. The plant is operated by ECOfluid under contract with owner.

OPERATING RESULTS

Date
BOD

[mg/l] 
TSS

[mg/l]
TKN

[mg/l]
N-NO2/
N-NO3
Total
Nitrogen
[mg/l]
Fecal
Coliform
[Col./100 ml]
Turbidity

[NTU]
Apr-17-07
< 10
1
0.9
1.8
2.7
< 1
0.72
May-22-07
< 10
3
1.8
4
5.8
< 1
2.2
Jun-25-07
< 10
2
1.5
5.17
6.7
< 1
0.95
Jul-17-07
< 10
1
1.5
2.75
4.2
< 1
1.8
Aug-7-07
< 10
3
1.5
3.38
4.9
4
1.7
Sep-11-07
< 10
1
1.4
7.12
8.5
< 2
1.5
Oct-16-07
< 10
1
1.2
4.11
5.3
< 2
1.1
Nov-6-07
< 10
3
2.2
3.9
6.1
< 1
2.0
PERMIT
10
 10
 
 
10
2.2
2.0
(1) Less than (<) signifies detectable limit (different labs, different limits)

 

 

 

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