Reverse Osmosis Water Treatment Plant, St. Brides Correctional, Virginia

Start Date: Feb 2003
Completion Date: Jun 2004
Delays: GC Construction
Liquidated Damages: None
Change Orders: < $10,000
Contact: Gary Weddle, Project Engineer, VA Dept of Corrections, Richmond, VA

The Commonwealth of Virginia St. Brides correctional facility is located in the City of Chesapeake, Virginia. Part of a recent reconstruction was a brackish water reverse osmosis (BWRO) water treatment system to treat brackish shallow ground water found in the region. Layne Christensen was contracted to construct two new reverse osmosis process trains that are capable of producing 245,000 gallons per day (GPD) each for a total capacity of 490,000 GPD.

The new reverse osmosis membrane trains were designed as to incorporate an interstage turbo boost system to reduce the long term operating cost of the facilities. The turbo booster was supplied through PEI and the membrane trains were loaded with Toray Americas TMG20-400 low pressure RO membranes. The process design uses Bekaert Progressive Composites pressure vessels in a 4:3 array each capable of holding six standard 8-inch by 40-inch membrane elements. The control panel was supplied separately by Systems East, Inc.

Layne's scope included design, fabrication and installing fiberglass skids that hold the high-pressure pumps, membrane process trains, skid instrumentation and instrumentation panel. Separate fabricated skids were provided for the cartridge filter housings and CIP system. AMS is providing installation supervision and start-up services to ensure a properly operating membrane system.

SOURCE: Layne Christensen