Submersible Chemical Inductor Brings Better Floc, More Consistent Finished Water Quality

The Sheboygan Water Treatment Plant uses conventional unit treatment processes (i.e. coagulation, flocculation, sedimentation, and gravity media filtration) to treat surface water from Lake Michigan.  The 35 million gallons per day (MGD) facility, originally built in 1929, serves the City of Sheboygan and several other surrounding communities.  According to Ron Marshman, filter plant foreman, lengthy detention (exceeding two minutes) in the facility’s rapid mix tank was leading to chronic floc shear prior to coagulant entering the plant’s two 2.3 mg sedimentation basins.  “Due to the long detention times, the coagulant would begin the flocculation process inside the rapid mix tank.  The heavy turbulence from the mix tank’s large, high-speed mixing propeller would then actually rip the floc apart.”  This resulted in erratic floc formation in the settling basins.

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