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Port Hardy

Capacity

10,000m³/d (2.65mg/d)

Flocculation

2-stage, mechanical flocculation

Retention time

20 minutes

DAF system (individual trains)

3 in number; each rated at 11m³/h (4.5 US gallons per minute per ft²)

DAF System (air loading)

10mg/l (maximum)

Filtration

4 rapid gravity filters with air scour. 11.6m³/h, 4.75 USgpm/ft²) dual media

Chemical treatment

Aluminum sulphate, soda ash, polymer, filter aid and potassium permanganate

Plant controls

Fully automatic with SCADA system

Project cost

$3.67 million (Canadian)

Raw water color (TCU)

271 (winter storm) 62 (summer)

Raw water turbidity (NTU)

5.0 (winter storm) 0.6 (summer)

DAF effluent color (TCU)

9 (winter storm) 3 (summer)

DAF effluent turbidity (NTU)

0.77 (winter storm) 0.5 (summer)

Filtered water color (TCU)

3 (winter storm) 0 (summer)

Filtered water turbidity (NTU)

0.05 (winter storm) 0.05 (summer)

Filter media

Coal and fine sand

Contract awarded

Mid 1999

Design commenced

August 1999

Completion

March 2000

Formal opening

April 2000

Operation commenced

May 2000

Local authority client

Town of Port Hardy

D-B-O contractor

Epcor

System design

Clearwater

Site-work supervision

Aqualta
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