Full Description

A novel system developed by the Long Beach Water Department to provide drinking water qualityby desalting seawater through dual-staged nanofiltration is being evaluated in a TailoredCollaboration project with the American Water Works Association Research Foundation(AwwaRF). The project includes several phases, among them providing the theoretical basis forthe system and optimizing its performance. From the classic equations of the solution diffusiontheory, a model was mathematically developed to provide real-world responses in assessing thesystem performance. Equations were modified so that permeate and concentrate qualities couldbe determined based on measurable parameters: temperature, operating pressure, feedconcentration and flow, membrane area, and the water and salt mass transfer coefficients.Comprehensive bench-scale testing of several nanofiltration membranes were conducted todetermine the mass transfer coefficients and rejection level achieved for the major ions present inthe seawater. The model was used to simulate performance achieved in a 15-gpm pilot plant.The model is able to predict the interplay between finished water quality, energy demand(operating pressure), and recovery and thus provide the demonstrable competitiveness of thisnovel seawater desalination system with conventional seawater reverse osmosis. Includes 3 references, table, figures.

Product Details

Edition: Vol. - No. Published: 03/01/2005 Number of Pages: 9File Size: 1 file , 430 KB