Start Date: January 2006
Completion Date: December 2006
Client: St. John’s County CR214 Mainland Water Treatment Facility

St. John’s County contracted with Aerex® Industries in conjunction with CDM Constructors for Construction Management and Ortega Industrial Contractors as the General Contractor to construct the new CR214 Mainland Water Treatment Plant.

The low pressure reverse osmosis system (LPRO) will use Dow/Filmtec LE-400 membranes in a 32-16 array. The system is designed for two 2.0 MGD skids for a total capacity of 4.0 MGD. However, the system design allows for the addition of a third reverse osmosis skid for a final capacity of 6.0 MGD.

The membrane skids were fabricated from structural steel coated with a 3-part epoxy paint system. Each 2.0 MGD skid was shipped to the water treatment facility fully assembled, including the vessels (less membranes), feed, interstage, concentrate and permeate piping, instrumentation and instrument panels, sample panels, valves and junction boxes. Upon arrival at the facility, the skids were off-loaded and rolled into place ready for installation of the final piping and electrical connections.

The membrane system was developed as a design/build project by CDM. Aerex® supplied all of the 316 stainless steel process trench piping and the cartridge filter housings.

Aerex® supplies engineering design, project management and field service support from its facility in Fort Pierce, Fla. Aerex® field service personnel provided training to St. John’s County personnel on all aspects of the system to ensure proper operation and maintenance of the system.