Stormwater Treatment using Ballasted Flocculation, the North American Experience

Description:Stormwater treatment using ballasted flocculation, the North American experience. Presenter: Chris Howorth, P.Eng., Veolia. Additional Contributors: Christian Cabral, Daniel Lamarre. As we continue mitigating our impacts on the environment, tackling uncontrolled discharges of raw sewage during storm events becomes increasingly important. Control measures broadly divide into hydraulic retention approaches (e.g. flow control devices, retention ponds, tunnels etc.), and treatment approaches. Treatment ranges from screening to remove trash, through physical/chemical contaminant removal, to disinfection for pathogen control. Stormwater’s sporadic, intense nature makes contaminant removal particularly challenging. Ballasted flocculation technology (such as Veolia’s Actiflo™ process) are increasingly being applied to overcome these challenges, including in Western Canada. This paper presents the technology’s principles of operation, design considerations and performance. Full scale, North American installation experience will be presented. A recent innovation, combining physical/chemical treatment with high-rate biological treatment for soluble BOD removal, will also be presented. This paper summarizes how stormwater is being treated to secondary effluent quality in a compact, cost effective manner.

Authors: Chris Howorth

Subjects: Energy and Climate Change, Environment and Conservation, Watersheds

Tags:AC15,AC15 presentations,2015 BCWWA Annual Conference & Trade Show

Citation:Stream 9: Other

Publication Date:May 29th, 2015 Upload Date:Jun 26th, 2015

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