Severn Trent Services' UA™ unit train, consisting of 756 reverse osmosis (RO) membranes within 108 pressure vessels, is part of a filtration package designed by Separa-tion Process Inc. (SPI) that is treating 3 mgd of water supplied to injection wells.
The Water Replenishment District of Southern California (WRD), in partnership with the City of Long Beach and Orange County Water District, is heading up the project. The ABRWP involves the construction of a state-of-the-art water treatment facility to further purify water from the Long Beach Water Reclamation Plant. The highly treated recycled water, that otherwise would be discarded into the ocean, will be substituted for potable water currently used in the Alamitos Barrier injection wells.
Located along the Los Angeles and Orange County border, the Alamitos Barrier protects a portion of the Central Basin from seawater intrusion. The over-pumping of groundwater basins caused water levels to drop and seawater to enter the basins. To prevent additional contamination, seawater intrusion barriers with injection wells were constructed along the coastline.