Using Nanofiltration To Provide A New Source Water For A Small California City

The City of Signal Hill, California was faced with rising wholesale water costs and deterioration of their local groundwater well system. In order to alleviate the problem they decided to treat water with high color and organics. This well is located at the existing City Yard at 2175 E. 28th Street in Signal Hill. A nanofiltration (NF) membrane treatment system was proposed to be used to remove color and organics from the groundwater. The membrane system is designed to treat well water containing low salinity (less than 400 ppm TDS) and high level of color (over 50 color units). The objective of the treatment is to produce potable water with color below 5 color units without significant reduction of concentration of dissolved ions. The system will be equipped with NF membranes, Hydranautics HYDRACOR 5 or equivalent, that are providing excellent performance in treating similar low salinity, high color water at other locations in California. The NF membrane system is designed for operation at a recovery rate of 98%. Based on operation of similar units at other locations and consultations with the membrane manufacturer, operation at this level of high recovery rate will be possible using a three stage configuration. The feasibility study also analyzed several different treatment capacities from 1,200 gallons per minute (gpm) to the full well capacity of 2,000 gpm. The design of the treatment train and ancillary facilities including: Well Equipping (pump, motor, piping), Pretreatment Chemical Feed, Cartridge Filters, NF Booster Pumps, NF Trains, Concentrate Disposal, Post Treatment Chemical Feed, Product Water Storage, Product Water Pump Station, Electrical Service, Instrumentation & Controls, Building Architectural & Structural, Piping Connections to the City of Signal Hill Water System and Waste Disposal Pipelines

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