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Home > Projects> Drumheller, Alberta, Canada, The Town of Drumheller WWTP Upgrade 

Drumheller, Alberta, Canada, The Town of Drumheller WWTP Upgrade

Project Summary:

Project Type:

Design, Build and Service

Project Category:

Municipal Wastewater Treatment

Project Purpose:

To treat sewage
Design Flow: 6,706 Cubic Metres/day
Year of completion: 2010


Full Description:

Background
The original facility includes two ponds, a control office/digester building and a clarifier. Napier-Reid supplied one primary clarifier and two secondary clarifiers for upgrading the Drumheller WWTP to an average flow rate of 6706 m3/day.


Primary Clarifier, Drumheller AB

The Treatment Process

The primary clarifier is a Napier-Reid Model CCD-012 circular clarifier, which is a side-pipe-feed unit with peripheral effluent collection. The secondary clarifiers are two Napier-Reid Model CCD-015 circular clarifiers that are centre column supported feed unit with peripheral effluent collection. Both primary and secondary clarifiers are centre-driven full-bridge mechanisms for suspended solids removal. Activated sludge passes subsequently through the secondary clarifiers, and the settled sludge is scraped from the basin floor to the sludge withdrawal sump by sludge removal rake arms. The clarified effluent is collected uniformly by a peripheral launder. Surface scum is collected by the scum skimming equipment and then discharged through the scum withdrawal pipe.

 


Performance Data
Parameter Primary clarifier Secondary clarifier
Basin Diameter 12,120 mm 15,240 mm
Average flow 279.4 m3/h 279.4 m3/h
Drive continuous torque 10,500 Nm (7,744 ft- lbf) 13,558 Nm (10,000 ft- lbf)
Drive 100% design torque 14,000 Nm (10,330 ft- lbf) 30,506 Nm (22,500 ft- lbf) 
Mechanism rotation Clockwise Clockwise
Drive motor 0.55 kw (0.75 HP) 0.55 kw (0.75 HP)
Rake arm tip speed 3 m/min (max) 3 m/min (max)

Scope of Supply

For primary clarifier:
Walkway with handrails, centre drive assembly, overload protection system, influent well, sludge collection arms with rake blades, surface scum skimming equipment, feedwell, effluent weir plates and scum baffle, effluent launder cover, peripheral baffles, anchor bolts, assembly fasteners and all necessary control and instrumentation for automatic operation. For secondary clarifiers:
Walkway with handrails, centre drive assembly, Center drive platform, centre support column with inlet openings, feedwell, centre cage, sludge collection arms with rake blades, surface scum skimming equipment, effluent weir plates and scum baffle, effluent launder cover, peripheral baffles, anchor bolts, assembly fasteners and all necessary control and instrumentation for automatic operation.

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