Please draw the Process Flow Diagram and Demonstrate the Degree of Freedom process

 

3. (20 points) Erin Brockavich and hexavalent chromium. Natural gas is a common heating source for residential and commercial buildings. At a natural gas production facility, hexavalent chromium was added to cooling water in a natural gas compression station to inhibit corrosion in the pipes. The water contained 5.15wt% hexavalent chromium and was discharged from the plant as a waste stream. The waste stream is fed to a treatment unit that rejects 95% of Cr from the feed and 20% of the water. The rejected Cr and water are called the retentate. The retentate is recycled back the compression plant. The permeate (residual liquid stream leaving the treatment unit) is sent to a waste lagoon. The treatment unit has a maximum capacity of 4500 kg wastewater/hour. If the wastewater leaves the compression station at a rate higher than the capacity, the excess wastewater bypasses the reverse osmosis treatment unit and combines with the permeate leaving the treatment unit before going to the waste lagoon. If the wastewater leaves the compression plant at 6000 kg/hr, what is the mass flow rate of the stream entering the lagoon? What is the mass fraction of hexavalent chromium of the stream entering the lagoon? a. (15 points) Using the general procedure from class, determine if this problem is solvable. If yes, state why but do not solve any equations. If no, state why and indicate what information is missing. Be sure to clearly define the naming convention for the streams.