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[Presentation PDF]

Room: Capitol II

The Science of Mixing and Maintaining Water Quality in Storage Tanks

Water quality problems in storage tanks, including loss of disinfectant residual and DBP spikes, can be a direct result of short-circuiting, poor mixing and circulation, poor turnover, and excessive detention time. Many of these water quality problems can be specifically attributed to the location and orientation of the inlet and outlet pipe(s). This presentation discusses the science of hydraulic short-circuiting and mixing in storage tanks (reservoirs, standpipes and elevated tanks). Computational Fluid Dynamics (CFD) models and 3D Laser-Induced Fluorescence (3DLIF) scale models are used to illustrate mixing and how it is impacted by tank style, inlet and outlet pipe configuration, inlet momentum, and temperature differences between source and tank water. Both passive and active mixing systems are discussed and several case studies are presented that use "before" and "after" sampling data to show improvements in water quality after the installation of a mixing system.

Moderator:  Paul Schumi


Mike Hively - Tideflex Technologies
Mike Hively works as a Tideflex Mixing System Product Manager. Mike’s 10 years’ experience of consultative sales, training, and management led him to the role of TMS Product Manager. Mike conducts technical seminars and webinars, The Science of Mixing and Maintaining Water Quality in Water Storage Tanks, to OEM’s, engineers, water utilities, and all levels of Rural and AWWA associations. Mike is responsible for training a national network of local Red Valve representatives.
As a member of NRWA and AWWA, Mike’s main objective is to educate engineers and water utilities by way of technical seminars to ensure every community enjoys high quality tap water.