Seawater desalination plant configuration

SEAWATER DESALINATION PLANT CONFIGURATION 53 Pump House... 

This provides mechanical stability to the fiber array in the RO element. The fibers at one end of the element are precisely cut so that product water can be discharged from the bore of the fibers. Toyobo RO modules for seawater desalination have configurations in the doubleelement type as shown above. Because the permeate water of each element in a pressure vessel can be obtained directly, the quality of each permeate water can also be measured directly. This feamre allows easier maintenance of an RO plant (Kannari, 1995). 

SWRO system. For example, a partial second-pass configuration is nsed at the 95,000-m / day Tampa Bay seawater desalination plant. The second pass at this facility is designed to treat up to 30% of the permeate produced by the first-pass SWRO system as needed in order to maintain the concentration of chlorides in the plant product water always below lOOmg/L. The partial second pass at the Tampa Bay seawater desalination plant was installed to provide operational flexibility and to accommodate the wide fluctuations of source water salinity (16,000-32,000mg/L) and temperature (18-40°C). Typically, the product water quality target chloride concentration of 100 mg/L at this plant is achieved by only operating the first pass of the system. However, when source water TDS concentration exceeds 28,000 mg/L and/or the source water temperature exceeds 35°C, the second pass is activated to maintain adequate product water quality. The percent of first-pass permeate directed for additional treatment through the second pass is a function of the actual combination of source water TDS and temperature and is adjusted based on the plant product water chloride level. 

The plant can also be configured to produce potable water using a two-stage reverse osmosis system for seawater desalination. The amount of potable water produced could also be selected in response to demand at each site, but the maximum capabilities of two types of the 4S to produce potable water are 34 000 m /day and 170 000 mVday respectively, when all generated energy is utilized for desalination. 

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