Читать книгу Introduction to Desalination - Fuad Nesf Alasfour - Страница 23

1 A simple one‐stage RO desalination system operates under steady flow; brackish water with feed capacity of 200 m3/h and 3000 ppm salinity needs to be desalted to 150 ppm as a potable water.Find:Concentrate flowrateConcentrate salinityRecovery ratioSolutionMass balance: Assume constant density (incompressible)Then Salinity balance: Recovery ratio: = 70%Extra activity:Student can perform the following:Derive RR relation as a function of three stream salinities.Select one practical operational parameter and examine its effect on RR. Plot and explain.Calculate salt rejection (SR), where SR is defined asSR = 100 − SPSP is salt passage across membrane SP = xp/xf, then perform a proper parametric study. Plot and explain.Perform parametric study to investigate the effect of feed salinity on concentrate salinity. Plot and explain.