Q: Calculate the operation time needed when applying 198 bar in a single membrane module to produce the required amount of drinking water for the following process? A reverse osmosis process is used to produce 1500L of water per day for drinking. In the RO step, it is given that retentate is fixed to 21wt% salt. Typically, the composition of seawater is 3.6wt% salt and water are drinkable when the salt concentration is reached at 0.04wt%. For this reverse osmosis system, the osmotic pressure is given by =14.61.14TiCi(bar)T:temperature(Kelvin)andCi:concentration(lmol)ofithspecieinthestream The system is perfectly mixed on the permeate side and on the feed side, the ionic concentration is found as the average between the compositions of the inlet and outlet streams where a reference temperature of 21 degrees Celsius is considered. (Concentration compositions should be in mol/L, molar mass of salt =57.5g/mol ) The area and the permeance (Pwater) for the membrane module are 25m2 and 0.060 lh1m2bar1 respectively