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Two processes are under consideration for desalting irrigation return flows in the Rio Grande Reverse osmosis RO will remove over 97% of the salt allowing for a high percentage

Two processes are under consideration for desalting irrigation return flows in the Rio Grande. Reverse osmosis (RO) will remove over 97% of the salt, al- lowing for a high percentage of blending with poor- quality well water. Nanofiltration (Nano) will not remove as much salt as RO (e.g., about 90%), but the operating pressure is lower and the flux is higher (allowing for fewer membranes). The costs associ- ated with each system are shown. Calculate the rate of return on the incremental investment and deter- mine which process should be selected, if the MARR is 6% per year. Assume one of the processes must be selected.

 

Capital cost, $                             3,200,000          4,800,000 Operating cost, $ per  year 250,000   490,000 Revenue, $ per year  1,900,000          2,600,000

Life, years                                              10                   10

the two types should be selected by calculating the                     

May 12 2020 View more View Less

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