Desal URN test

Seawater Desalination Research located power plant intake would have higher temperatures, which would lead to different permeate qualities and energy consumptions than those reported by the ADC. Highest temperatures tended to occur in the fall months, while the lowest temperatures were seen in spring. Feed salinity and boron remained very stable over the three years of recorded data with an average of 35,000 mg/l TDS and 5 mg/l boron. As shown in Figure 2, ADC I tested three sets of FilmTec membranes Parameter Unit Value gpm/ft2 3 to 6 in/mm/- 18 / 0.85-0.95 / <1.4 in/mm/- 10 / 0.45-0.55 / <1.4 in/mm/- 6 / 0.3 / <1.4 gpm/10-in 22 each, #2, 5 micron x 40 in ~1 Media Filter Loading Rate Depth/Grain Size/U.C. of Anthracite Depth/Grain Size/U.C. of Sand Depth/Grain Size/U.C. of Gravel Cartridge Filter Cartridge Specs Loading Rate Membrane System ADC I Test FilmTec SW30HR-380, FilmTec SW30XLE-400i, FilmTec SW30HR LE-400i ADC II Test Koch TFC 2822HF-400 Hydranautics SWC5 FilmTec ISD Hybrid Toray TM800E-400 8 7 3 Positive Displacement David Brown Union, Model TD-60 1385 to 2305 (600 to 1000) Pressure Exchanger Energy Recovery, Inc. Model PX-70S Centrifugal Energy Recovery, Inc. Model HP-8504 70 to 115 (20 to 50) Models Diameter Elements per Vessel Vessels Type Model TDH Type Model High Pressure Pump Energy Recovery PX Booster Pump inch No. No. ft (psig) Type Model TDH ft (psig) Desalination & Water Reuse Vol. 18/2 Table 1. Design Criteria for ADC's SWRO Demonstration Scale Equipment y 32 Flux, gfd Recovery, % HP pump, gpm PX Booster Pump, gpm Permeate, gpm PX Inlet, gpm Concentrate, gpm 6 42.5 36.5 46.0 36.5 50.0 36.5 7.5 42.5 45.3 46.0 45.3 50.0 45.3 9 42.5 54.0 46.0 54.0 50.0 54.0 10 42.5 54.0 46.0 54.0 50.0 54.0 45.9 35.0 45.9 47.4 39.6 35.0 39.6 41.1 33.5 35.0 33.5 35.0 57.7 43.8 57.7 59.2 49.9 43.8 49.9 51.4 42.3 43.8 42.3 43.8 69.5 52.5 69.5 71.0 60.1 52.5 60.1 61.6 51.0 52.5 51.0 52.5 69.5 52.5 69.5 71.0 60.1 52.5 60.1 61.6 51.0 52.5 51.0 52.5 Table 2. ADC II 12-Point Flux-and-Recovery Matrix Temp. °F / °C Feed pH Feed salinity Ktds Feed Boron mg/l Raw Feed Turbidity NTU RO Feed Turbidity NTU RO Feed SDI Low 54 / 12 7.22 33.40 3.90 0.24 0.03 1.8 High 68 / 20 8.75 36.81 5.53 12.00 0.25 11.4 Average 59 / 15 7.88 Table 3. Sea/Feed Water Quality 35.39 4.78 1.45 0.07 4.0 © 2008 FAVERSHAM HOUSE GROUP exclusively and ADC II tested one set of membranes from each of the leading manufacturers including the Toray – TM820E-400, Koch – TFC 28822HF400, Hydranautics – SWC5 and FilmTec (ISD) Hybrid Configuration. Feed Water Turbidity and Pretreatment Performance The pretreatment process for the ADC's demonstration-scale equipment included in-line coagulation and media filtration, followed by 5 micron cartridge filtration (see criteria established in Table 1). Initially during ADC I, in 2005, Southern California experienced localized and prolonged periods of red tides and extensive algae blooms throughout the summer. Red tides tend to occur most frequently in the spring and fall months and average 1-2 weeks in duration. The summer of 2005 was recognized as an anomalous period. By contrast, from the start of ADC II in August 2007 until July 2008, the ADC has experienced approximately eight discrete days in which satisfactory water quality could not be achieved using the basic multimedia system. In full-scale applications, more robust designs would be applied to ensure that water quality and continuous operation could be maintained through these challenging but brief events that occur in Southern California coastal waters. In general, the ADC pretreatment system has performed very well for the specific application. On average, the media filtration system has reduced feed water turbidity by 95% and yielded an average RO feed water SDI of approximately 4.0. The 5 micron stringwound cartridge filtration system was used at an approximate one gallon per minute (gpm) per 10 in of equivalent cartridge length. Cartridge differential pressures at baseline conditions resulted in differential pressure increases at a rate of approximately one psi per month of operation. Membrane Performance Over a period of three years, the ADC tested seven different membrane sets as outlined in Table 1. The data demonstrate that low energy

• Cover