ANALYSIS AND BEHAVIOR OF CHLORIDE SOLUTIONS IN FLAT REVERSE-OSMOSIS MEMBRANES

In the field of reverse osmosis (RO) there are several theories from w hich mathematical models have been developed, allowing for the simulat ion of processes and the prediction of results. This study used the mo del developed by Slater and Col, based on the solution-diffusion model for the simulation of RO processes. It was developed with an M20 RO L ab Unit made by DOW DANMARK SEPARATION SYSTEMS and uses a pair of flat membranes of HR 98 PP type, also made by DOW DANMARK A/S SEPARATION S YSTEMS. The results obtained are within the expected range for the vol ume flows and permeate concentrations under study. All the relevant co nstants in the model were determined, and were found to be in agreemen t with the expected results. The solute used was potassium chloride (K CI) and the dissolvent was distilled water, with concentrations rangin g between 200 and 3000 ppm. Feed flows were in the range of 4.80 y 8.1 8 L/min, while the working pressure varied between 5 and 20 bar.