Highland Beach’s reverse osmosis (RO) water treatment plant removes salts from the brackish Floridan Aquifer source to produce clean, potable water. But the treatment process also removes calcium and alkalinity, which makes the water potentially corrosive. A calcite reactor system was added to the treatment process to provide supplemental calcium and alkalinity, but after several years the Town wanted to upgrade to a newer remineralization system that would be easier to control and provide a more consistent finished water quality.

The Town selected Globaltech to design, specify, permit, bid, and oversee installation of a new lime slurry/carbon dioxide remineralization system to replace the existing calcite reactor system.

The design included a 16,000-gallon lime slurry storage tank with tank mixer and two metering pumps, and a 6-ton carbon dioxide storage tank equipped with feed panel and electrical control panel.

Project Achievements / Benefits

• The new lime slurry/carbon dioxide remineralization system doubles the hardness concentration previously achieved by the calcite reactor system. It is also easier and safer for Town staff to use, and allows for more precise addition of calcium hardness as well as pH control.
• As part of the project, Globaltech assisted the Town in applying and obtaining State Revolving Fund (SRF) loan funding to finance the new system.
• The new mineralization system is meeting its treatment goals as calculated by Globaltech:
  – pH range of 7.6 to 8.0
  – Minimum Calcium Hardness of 40 mg/L as CaCO3
  – Minimum Alkalinity of 40 mg/L as CaCO3