Water Treatment Case Studies: Ballasted flocculation for a Resilient City
Christian Scott (Veolia Water Technologies Canada)

Cities are facing new threats, such as climate change, that require the implementation of resilience strategies. They must adapt and strengthen their water treatment infrastructure.Surface water is affected by these changes: abrupt changes in flow and water quality, increased presence of algae, effects of forest fires, etc. Hydrocarbon transport exposes these same water sources to the risk of spills.

The treatment of water by ballasted flocculation has demonstrated its robustness, and thus its contribution to the resilience of cities. Examples are shown using 3 case studies: the 2013 Calgary floods, the 2016 Prince Albert oil spill, and the impact of the 2016 Fort McMurray wildfires.

Ballasted flocculation associated with pre-contact and CAP recycling can cover a wider range of risks: elimination of NOM, tastes and odors, pesticides, emerging pollutants endocrine disruptors, pharmaceuticals, and cyanotoxins . The presentation describes the technology, and shows its performance via the results of some installations.