Pre-design, detailed design and construction
The project included the headworks (influent screening and grit removal), aeration basins, secondary clarifier system, boiler, laboratory and control building, and effluent pump station.
The Creston wastewater treatment plant (WWTP) was constructed in the 1970s. It treats both domestic and industrial (brewery) wastewater. Effluent is discharged to the Kootenay River via an outfall. The brewery waste is treated in an anaerobic digester before entering the extended aeration activated sludge process along with the domestic wastewater.
Development in the area is accelerating and several of the plant processes need to be expanded to accommodate increasing loads. Also the process and equipment reliability (redundancy) do not meet the requirements of the Municipal Sewage Regulation.
Problems with the existing facility include:
- Upsets to the digester caused by excess fine solids in the brewery wastewater
- Overloading of the final settling tanks during wet weather
- Worker health and safety issues associated with the existing buildings and the effluent pump station
- The configuration of the disinfection system
- Poor performance and maintenance access for the preliminary treatment process (influent screens and grit removal)
The objective of the project is to provide a wastewater treatment facility that will serve the community’s long term financial, environmental and social needs. It will improve the performance of these facilities to meet current standards and provide additional capacity for increasing plant loads.
This project will also improve plant performance and reliability for liquid and solids treatment, protecting the receiving environment and enhancing biosolids recycling opportunities.
The outcome of the project will be a modern wastewater treatment facility that best serves the long-term needs of the community and is designed to meet current and future regulatory standards for environmental protection.