Consider the following Reverse Osmosis unit composed of 4 modules. The recovery ratio and the brine salinity for each module are shown in figure 3. The feed flow rate of the unit is equal to 10000 m³/day. 1. Find the flow rates on the sides of each module (feed, permeate and rejection sides) as well as their respective concentrations. Present your results in a table 2. Find the product salinity. 3. Find the osmotic pressure values at the feed and brine sides for each membrane. 4. Find the overall recovery ratio and salt rejection of the whole unit.

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