at 10H30 | 518 B

Future-Proofing Aerated Lagoons

Moderated by: Bertrand Alibert, AXOR Experts-Conseils
Innovation and clean technology

- Nutrient Removal at Lagoon Facilities using MBBR Technology: Low Temperature Performance and Bacterial Response

The major challenge that has restricted the application of nutrient removal technologies to wastewater treatment lagoon facilities in temperate and cold climate countries such as Canada is the inability of many current technologies to achieve nitrification at the very low temperatures characteristic of lagoon systems during winter operation. The study investigates the use of the moving bed biofilm reactor (MBBR) technology as a low operational intensity upgrade solution to lagoon facilities in temperate and cold climates to achieve year-round, low temperature nitrification, to achieve total nitrogen removal via conventional nitrification/denitrification, and to achieve total phosphorus removal via biomass assimilation. The study demonstrates the potential of the MBBR technology as an economical, small land footprint and low operational intensity upgrade technology to achieve significant nutrient removal at lagoon facilities operated in a temperate and cold climates.

- Solids, algae, and phosphorus removal performance of discfilter treatment systems as an upgrade to wastewater lagoons.

In North America, lagoon passive treatment systems are one of the most prevalent treatment technologies for wastewater in small and rural municipalities. Effluent solid concentrations are an issue with lagoon systems for regulation compliance. As stricter discharge regulations are being put forward by governing agencies, the need for low footprint technologies as means to upgrade current lagoon systems is becoming more apparent. This research studies the application and performance of the HydrotechTM discfilter system as a low-footprint upgrade solution for solids removal, as well as peripheral benefits such as removal of E.coli, phosphorus and algae. The study serves to describe the main and peripheral benefits of implementing this upgrade technology in existing wastewater lagoons and whether this technology is a viable option for a low footprint upgrade to wastewater lagoons in meeting stricter regulations during seasonal discharge operations.

- Lagoons and Ammonia : How to meet Federal and Provincial Toxicity Requirements ?

Now that federal and provincial regulations have made non-toxicity a requirement for wastewater treatment systems in Canada, municipalities with lagoons and their engineers are having to decide : do we have to replace the facility entirely, or is there a way to save the infrastructure that has served us well? What are the proven technologies available to us? Through the lens of a case study of a three-cell facultative lagoon-based wastewater treatment plant located an hour’s drive southwest of Gatineau, this presentation digs into the factors that limit lagoon-based nitrification, discusses the merits and challenges of various alternatives, and introduces the SAGR post-lagoon nitrification process—which has been shown to consistently reduce ammonia to <1 mg/L in <1°C water, therefore meeting the non-toxicity requirement year-round.