Finding the Right Mix

Abstract

This article discusses how effectively mixing stored potable water can deter harmful disinfection byproducts. The article discusses a relatively new and proven water‐mixing technology that uses a solar‐powered circulation system. As floating units, the circulators draw power from photovoltaic modules mounted on top of the tank, self‐adjust for all water levels in the tank, and depending on size, can pump up to 10,000 gal/min of water. Treatment problems are discussed, along with a successful project demonstrated at San Francisco Public Utilities Commission's Sunset Reservoir Basin where the circulator technology proved effective in breakpoint chlorination of a 90 million gal tank.