Sea water is to be desalinized by reverse osmosis (RO) using the process shown i

Question

Sea water is to be desalinized by reverse osmosis (RO) using the process shown in Figure 1. The process is designed to purify 1500 lb/hr of sea water which is comprised of 96.9 wt% water with the remainder comprised of various salts. Determine:

How much salt (in lb/hr) would be rejected if the recycle stream was removed (as shown in Figure 2)? Note: 99.95% of the salt is rejected by the RO unit. What are the waste brine and purified water flow rates for the process shown in Figure 2?

Brine recycle (m2) RO unit m5 m3 4.0 wt% salt Brine waste (ms) 5.25 wt% salt 3.1 wt% salt Desalinized water (m4) 500 ppm (by mass) salt Figure 1 RO unit 1500 lb/hr 96.9 wt% water 3.1 wt% salt Brine waste (mg) Desalinized water (m^) Figure 2

Explanation / Answer

Sea water is to be desalinized by reverse osmosis (RO) using the process shown in Figure
1. The process is designed to purify 1500 lb/hr of sea water...

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