To cover the energy needs of a food industry, a steam boiler is required to which it is necessary to feed 8000 l/h of wa

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To Cover The Energy Needs Of A Food Industry A Steam Boiler Is Required To Which It Is Necessary To Feed 8000 L H Of Wa 1 (28.67 KiB) Viewed 41 times

To cover the energy needs of a food industry, a steam boiler is required to which it is necessary to feed 8000 l/h of water. The water available comes from an aquifer current that has a hardness in CaCO3 salts of 8.5 g/l and to avoid scale problems in the boiler, its content should be reduced to 250 ppm The purification treatment is carried out with a reverse osmosis system that consists of a simple cascade of 2 units working at a temperature of 25 degrees centigrade and a pressure of 204 atm. The membranes of each unit have a water permeability of 1.29* 10-6 moles of H₂0/cm²s atm and a CaCO3 permeability of 9.18* 106 cm / s. If the recovery factors of the first and second stage are 80% and 90%, respectively, and the retention factor of the CaCO3 membranes is 90%, calculate: a) The flow rate and concentration of the permeates obtained in each stage b) The required membrane area of each stage