Mixing system leads to significant energy savingsProblem: The Milwaukee (Wisconsin) Metropolitan Sewerage District needed to reduce the mixing energy in the anaerobic digestion process at the South Shore Wastewater Treatment Plant while maintaining consistent and optimal volatile solids destruction and methane gas production.Solution: A study compared two 125-foot-diameter anaerobic digesters to determine if the JetMix Vortex Mixing System from Evoqua Water Technologies could perform better than linear motion mixing at a reduced energy level. The JetMix system uses two pumps with 100 hp motors, delivering 9,000 gpm through nine jet nozzles. A variable-frequency drive optimized the run periods for less
