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Tenders out for project to eliminate wafting odours from Alliston sewage plant

Posted July 3, 2014

Ministry of Environment backlogs that delayed upgrades to Alliston's sewage treatment plant by about a year, have eased allowing New Tecumseth to issue the tender for the estimated $3 million project that includes about $1.8 million to upgrade the headworks - the intake source of raw sewage as odour control measures.

The plant, located on Sir Frederick Banting Road, just south of Victoria Street East, has been the source of consistent complaints for several years from its neighbours in the area because of the smell it generates. It was built in 1973, and until the construction of the regional plant on the 14th Concession, was the main treatment facility in Alliston.

Inhouse improvements over the past few years has helped reduce the incidents of odours, but the proposed works are expected to virtually eliminate the issue. Planned work includes two new mechanical screens and a washer/compactor/conveyor, new odour control system and associated ductwork, new electrical room, new mechanical room, with all associated yard piping and restoration. The building expansion includes structural, architectural, mechanical, electrical, instrumentation and controls.

XCG Consultants "The comminutor (a machine that pulverizes solids) will be replaced with mechanically cleaned bar screens," according to 2012 report to council prepared by XCG Consultants. "The odours produced from the wastewater in the influent and effluent channels at the headworks and grit tank will be contained by an odour removal system. The off-gases from the existing aerobic digester/aerated holding tank should also be directed to the odour control facility to reduce odour emissions from that source. At the time that the design of the new headworks building is done, the hydraulics through the plant should be re-assessed to ensure that the firm pumping capacity of the sewage pumping stations does not exceed the plant hydraulic capacity."

Six general contractors have been short-listed, and a mandatory tender site meeting is scheduled for next Wednesday (July 9) morning. Bids close July 24.

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