3. 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: a) The flow rates of fresh water (m4) and brine waste (m6). b) The percentage of salt rejected by the RO unit. In other words, what percent of the salt fed to the RO unit in m3 exits the RO unit in m5. c) The percentage of brine exiting the RO unit that is recycled.
3. 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:
a) The flow rates of fresh water (m4) and brine waste (m6).
b) The percentage of salt rejected by the RO unit. In other words, what percent of the salt
fed to the RO unit in m3 exits the RO unit in m5.
c) The percentage of brine exiting the RO unit that is recycled.
d) How much salt (in lb/hr) would be rejected if the recycle stream was removed (as shown
in Figure 2)? Note: 99.8% of the salt is rejected by the RO unit. How does this compare
to the process in Figure 1? Can you determine the waste brine and purified water flow
rates for the process
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