Amherst Wastewater Treatment Facility
- Dillon Consulting Ltd.

» Scope of Project

Following the completion of a competitive proposal process in 2005, Dillon was retained by the Town of Amherst to provide engineering design and construction administration services to support the development of a new 2.3 migpd wastewater treatment facility (WWTF), situated on the marshlands west of Highway 104 adjacent to the LaPlanche River.

» Execution

The conceptual requirements for the WWTF had been confirmed through an options review evaluation completed by Dillon in 2004. In advance of detailed design, Dillon coordinated a flow monitoring program, collection of wastewater analysis data for purposes of developing design flows and identifying opportunities for reduction of infiltration and inflow measures. In 2006, the Town directed Dillon to focus its design efforts on a $1.2M gravity/forcemain collection system to direct wastewater from the eastern portion of the community to the new treatment plant location.

Construction of the collection system was completed in 2007. With the launch of infrastructure funding programs in early 2009, WWTF design efforts were re-initiated leading to the release of a tender package in February 2010. Brycon Construction was the successful bidder and construction commenced in May 2010. The official opening of the $10M facility occurred on October 11, 2012 with representatives of all three levels of government being in attendance.

» Project Highlights

Design and construction administration services supporting the establishment of an aerated lagoon/settling pond treatment system complete with a 4.4 ha surface and subsurface flow engineered wetland component – the largest of its kind in Atlantic Canada. In collaboration with NS Environment, a UV disinfection system was identified as a potential future system requirement (resulting in a significant capital and operating cost saving), pending the evaluation of the first few years of facility performance data. In one of the four subsurface engineered wetlands, tire–derived aggregate (TDA), sourced from Nova Scotia’s end-of-life tires, was used as the cell media in lieu of gravel.

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