Pump & Treat System for Chlorinated Solvents & 1.4-Dioxane

GWTT was selected as the general contractor to construct a pump & treat system at an inactive industrial facility in Florida. The initial system was constructed for the treatment of chlorinated solvents in the localized groundwater, which were slowly migrating downgradient toward a major city production well.

The first stage of the project involved the installation of seven QED AP-4 pumps in extraction wells that were drilled by the environmental consultant as well as over 7,000 ft of HDPE conveyance pipe and 1,500 ft of galvanized steel compressed air supply pipe between the pumps and system location. GWTT also installed a reinjection gallery for the treated effluent from the system. The 50-GPM skid-mounted system was constructed at our facility in Wharton, NJ, which contained a low-profile air stripper, bag filter housings, reciprocating compressor, and main control panel. The system was provided with secondary containment within the skid, as required by the consultant. The system was shipped to the job site and set in place on a slab constructed after the piping was terminated from the wells. Once in place, final terminations for piping and electric were completed, and the final roof for the structure was installed. An access road to the system was built during final restoration to accommodate future operations and maintenance activities.

The second stage of the project involved the integration of an ozone and hydrogen peroxide injection system to reduce the concentration of 1,4-dioxane in the groundwater which had been observed just prior to startup of the first system. A remediation technology company provided a 40-GPM HiPox system to GWTT and the consultant for installation on site. GWTT made the necessary site work and mechanical modifications to the original system for incorporating the new HiPox system.

GWTT worked closely with the company during the fabrication process to ensure the control modifications were properly integrated between the original control panel and HiPox control panel. GWTT and the company worked together on the startup and prove out of the system to minimize recycle durations and to ensure the effluent concentrations were at or below the maximum concentration level for all compounds.