SIMULATION OF TUBULAR REVERSE-OSMOSIS

The rational design of reverse osmosis systems is made difficult because the engineering variables Of PresSure, flow rate, solute rejection and permeate flux are interrelated in a complex way, even before such effects as membrane fouling and degradation are taken into account. Where Pilot-plant data may be available, unless they cover a very comprehensive rang of operating conditions, it will still be difficult to estimate the consequences of varying the parameters in the process of seeking the most economic design. A similar situation applies to an existing plant which has to be adapted to changing circumstances. Although complex, the underlying mechanisms of reverse osmosis are quite well understood, and are readily amenable to computer simulation. A computer package is being developed to serve as a tool for the analysis or design of reverse osmosis plants. Its use is demonstrated by means of a hypothetical case study based on pilot-plant data gathered at the Lethabo Power Station near Sasolburg.