Located between Lake Erie and Lake Huron, the City of St. Thomas is a growing community located just south of the City of London and two hours west of Toronto, Ontario.
Like many smaller cities, St. Thomas had historically made use of anaerobic digestion as part of its wastewater treatment process. With aging infrastructure and budget constraints, City staff worked hard to extend the life of the failing digesters. This was achieved by applying critical repairs to maintain ongoing operations. However, the existing infrastructure was inevitably losing its utility – while the City continued to grow.
Additionally, biosolids from the existing (failing) digesters were being transported to the local landfill with no opportunity for resource recovery. These factors, combined with pending regulatory changes as well as the City’s desire to have a sustainable, long-term solution, were the primary drivers for St. Thomas to find a better way to manage their biosolids.