IMPROVING ENERGY EFFICIENCY OF LOW SALINITY DESALINATION (WASTEWATER AND BRACKISH WATER) USING ENERGY RECOVERY DEVICE - CASE STUDIES

摘要

Overview The Initial Expansion of the Groundwater Replenishment (GWR) System Project (Expansion Project) is a proposed expansion of Orange County Water District's (OCWD or District) Advanced Water Purification Facility (AWPF) located in Fountain Valley, California. This paper describes the energy recovery and reverse osmosis (RO) process optimization features of the Expansion Project. The GWR System consists of three major components: (1) the AWPF and pumping stations; (2) a transmission pipeline connecting the treatment facilities to existing recharge basins; and (3) an existing seawater intrusion barrier. The expansion will add 30 million gallons per day (mgd) to the production capacity of the AWPF. A major portion of the Expansion Project was to review existing design and operations of the RO system at the AWPF and evaluate applicability of energy recovery devices (ERDs) for the new RO units. Based on this evaluation,preliminary design criteria for the 30 mgd expansion were developed to enhance the energy efficiency and operability of the new RO units.