Why mix? How active mixing maintains water quality in potable water storage tanks


Drinking water treated with either chlorine or chloramines will normally remain stable and safe for a few days in storage. Operators typically rely on normal cycling of water in and out of the tank to keep the water mixed to limit aging and deterioration of disinfectant chemicals. However, this “passive mixing” is often not enough to prevent thermal stratification that can lead to a drop in residual chlorine and the resultant growth of bacteria. When bacteria contamination occurs, a common practice is to drain and flush the tank, and refill it. This practice wastes water and raises costs for labor and chemicals.

Continuous, active mechanical mixing, combined with periodic disinfectant boosts, can maintain water quality by eliminating sampling inconsistencies and thermal stratification. This paper addresses how near-laminar-flow active mixing technologies not only maintain water quality but also reduce labor and chemical costs and help comply with EPA regulations.

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