Innovation and Energy Savings Prove a Great Idea for Oxnard Desalting Facility

Abstract

This article discusses the Groundwater Recovery and Treatment (GREAT) program used by the city of Oxnard, California to manage community water resources as an integrated, fully functioning regional water supply system. The concept behind the program was to reduce the need for imported water by creating facilities that can use local brackish groundwater resources, and thus reduce dependence on costly imported water supplies. The GREAT program links all the water resources in the Oxnard Plain – including imported water, local groundwater, wastewater, recycled water, and brine wastes – and delineates how each resource can be used for maximum benefit to the Oxnard area. Under the program, highly treated recycled water will be delivered to agricultural and industrial customers currently using groundwater for nonpotable purposes. In winter, when irrigation needs are low, recycled water will be used to recharge groundwater aquifers and help prevent saltwater intrusion in coastal wells. Desalination of brackish groundwater will allow the city to continue providing high‐quality drinking water while reducing reliance on imported water. The article discusses the advanced energy‐efficient treatment technology used by the Oxnard desalination plant that eliminates inefficient series pumping, reduces the size of the building required, and removes the need for noise reduction in the facility. Additionally, the design of each of the three Oxnard reverse osmosis (RO) units incorporated an interstage boost/energy‐recovery turbine. The design of the Oxnard facility incorporates principles and elements of the U.S. Green Building Council's Leadership in Energy and Environmental Design Initiative, and the facility's numerous green building elements are listed.