projects

Disinfection Byproducts Study

Inverness, Florida

Client: City of Inverness, Florida

Services

  • Alternatives Assessment
  • Bench-scale Treatment Testing

Project Summary

The City of Inverness obtains its drinking water supply from a single wellfield. The well water was pre-chlorinated and treated by the addition of phosphates for corrosion control followed by aeration, fluoridation, and final disinfection with sodium hypochlorite. The problem was that organic precursors combined with the chlorine to form chlorinated disinfection byproducts (DBPs) – Trihalomethanes and Haloacetic Acids – exceeding state standards.

The Florida Department of Environmental Protection issued a consent order requiring the City of Inverness to take corrective action to decrease the DBP concentrations. The City has retained Hoyle, Tanner to investigate DBP-reduction methods. Our investigation included: confirming the existing well water quality and aeration system effectiveness; bench scale testing of treatment methods; and an assessment of potential solutions and costs.

Treatment techniques assessed included MIOX, MIEX, chloramination and coagulation/filtration. Although the City would have preferred a filtration process such as MIEX that would remove the organic precursors, they opted for chloramination because of the relatively low cost. Chloramination was initiated in 2010 and has reduced the DBP concentrations to acceptable levels.

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