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Thursday, November 14 • 3:15pm - 4:00pm
Session A - Ammonia Permits and Lagoons: First Nations Communities and the Options Available for Beating Nutrient Limits

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Ammonia limits are becoming commonplace in lagoon-based wastewater treatment facility permits nationwide as regulators seek to protect wildlife in receiving waterways. This is forcing First Nations communities in western Canada to make an often-difficult decision: can lagoons meet tight limits, even when water temperatures plunge? This was in fact the same question faced by Lake St. Martin, Manitoba.

Through the lens of the case of Lake St. Martin’s lagoon-based wastewater treatment facility, constructed in 2016, this presentation digs into the many local and scientific factors that can influence this decision. They include the relevant local factors that limit lagoon-based nitrification, such as lack of dissolved oxygen, too much competition from BOD-consuming heterotrophic bacteria, and lack available surface area, or cold winter water temperatures. The presentation then explores the merits and costs of mechanical plants and introduces the SAGR post-lagoon nitrification option that reduces ammonia to


Thursday November 14, 2019 3:15pm - 4:00pm MST
Double Tree by Hilton 16615 109th Avenue North West, Edmonton, Alberta,