In 2012, the plant made a goal to reduce energy consumption.An evaluat ion of the mixing system was conducted in the biological selector basins. It revealed the potential for significant energy savings, due to already installed process improvements and repositioning the mixers for more efficient production of bulk-flow velocity.
Based on the results of the trial and observations of MMSD staff, Nine Springs WWTP selected Flygt over four other vendors. In 2013, the plant moved forward with Phase 1 of its project, installing the Flygt Model 4630 mixers in 26 of the biological selector basins. Later in 2015, Phase 2 of the project involved replacing the remaining ten selector zone mixers with Flygt model 4640, 4 HP mixers in zones that required additional mixing energy.