News | July 22, 2020

Drinking Water Cleanup On Long Island


On Long Island, water districts and authorities must rely on groundwater for their drinking water supply. Due to industrial manufacturing, 1,4-Dioxane penetrated the groundwater via a spill or straight disposal of the chemical onto the soil. These chemicals migrated into the aquifer and ultimately the water supply. In February of 2020, the state received a $120M in grants to assist the water districts to clean this contaminant as well as perfluorooctanoic acid - PFOA and perfluorooctanesulfonic acid – PFOS.

As a means of assisting some of the affected Water Districts, TIGG operated on an emergency basis to build GAC Systems that perform as a final procedure in the Advanced Oxidation Process (AOP). While Ultra Violet AOP removes the 1,4-Dioxane, peroxide is left as a residual in the water. The peroxide must also be removed. This is where TIGG’s GAC Adsorption Systems have been utilized. TIGG’s Systems remove the peroxide and other contaminants such as PFOS and PFOA

TIGG is currently under contract to build and provide 12-foot diameter, Granular Activated Carbon Systems as part of the 1,4-dioxane removal process at:

  • South Farmingdale Water District
  • Plainview Water District
  • Water Authority of Western Nassau County
  • West Hempstead Water District
  • Garden City Park Water District
  • Manhasset-Lakeville Water District
  • South Huntington Water District
  • Incorporated Village of Garden City
  • Water Authority of Great Neck North

The TIGG Systems were selected for their ease of operation, ability to provide a low pressure drop through the system, quality, and availability.

Source: Newterra, Ltd.