Status: In Progress
Biological Treatment System Expansion Phase 2
Summary
The City of Chilliwack operates the Chilliwack Wastewater Treatment Facility (WWTP) which currently provides secondary treatment for an average current annual flow of approximately 23,167 m3/d prior to discharge into the Fraser River via a submerged outfall with a multi-port diffuser.The City is seeking to expand its existing activated sludge treatment capacity to increase the plant’s capacity to treat and manage wastewater, address effluent toxicity issues, as well as enabling removal of the plant’s Trickling Filters Facility (TFF) from service after the proposed upgrades are completed.
The planned work for this Phase 2 expansion involves construction of two additional aerated bioreactor trains, with four aeration cells in each train and associated modifications/upgrades to the WWTP to connect the new system to the existing infrastructure.
Tagged: Wastewater Treatment
Client: City of Chilliwack
The project scope includes the design, construction, integration, commissioning and performance testing of new facilities and equipment, and consists of:
- Upgrades to the primary flow splitting and primary clarifier conveyance
- RAS (Return Activated Sludge,) Re-aeration (Optional)
- New Anoxic Basin, Bioreactor Inlet Splitter, and Bioreactors 2 and 3
- Bioreactor 4 (Optional)
- New Blowers, TWAS (Thickened Waste Activated Sludge) Pumps, WAS thickener, Polymer make-down system, and electrical equipment
- WAS thickener filtrate pumping and conveyance
- Dewatering centrate pumping and conveyance
- Upgraded RAS pumps/piping, and conveyance
- WAS pump relocation
- Integration and construction of underground pipelines between all processes
- Electrical upgrades
The expansion will include all required geotechnical, civil, structural, architectural, process mechanical, building mechanical, electrical & instrumentation works to house new equipment required for all treatment processes.
