An RO system uses a shallow brackish groundwater that averages around 4500 mg/L TDS composed primarily...

 

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An RO system uses a shallow brackish groundwater that averages around 4500 mg/L TDS composed primarily of sodium chloride. Permeate flow is maintained constant, but temperature, pressure, and feed concentration change over time as shown in the table below. The operators need to determine whether fouling has occurred between January and May. Parameter Unit January 1 May 31 Permeate flow m/d 7500 7500 Feed pressure bar 34.5 32.1 Concentrate pressure bar 31.4 29.1 Permeate pressure bar 0.25 0.25 Feed TDS concentration mg/L 4612 4735 Permeate TDS concentration mg 212 230 Recovery % 0.69 0.72 Water temperature C 11 18 The pressure vessels contain seven membrane elements. The manufac- turer has stated that performance data for this membrane element were developed using the following standard conditions: Parameter Temperature Unit Standard C 25 Feed pressure bar 30 Permeate pressure bar 0 Head loss per element bar 0.4 Feed TDS concentration mg/L 2000 Permeate TDS concentration mg/L 100 Recovery % 80 Determine the change in system performance (permeate flow and salt passage) that has occurred between January 1 and May 31. Assume = 1.0. An RO system uses a shallow brackish groundwater that averages around 4500 mg/L TDS composed primarily of sodium chloride. Permeate flow is maintained constant, but temperature, pressure, and feed concentration change over time as shown in the table below. The operators need to determine whether fouling has occurred between January and May. Parameter Unit January 1 May 31 Permeate flow m/d 7500 7500 Feed pressure bar 34.5 32.1 Concentrate pressure bar 31.4 29.1 Permeate pressure bar 0.25 0.25 Feed TDS concentration mg/L 4612 4735 Permeate TDS concentration mg 212 230 Recovery % 0.69 0.72 Water temperature C 11 18 The pressure vessels contain seven membrane elements. The manufac- turer has stated that performance data for this membrane element were developed using the following standard conditions: Parameter Temperature Unit Standard C 25 Feed pressure bar 30 Permeate pressure bar 0 Head loss per element bar 0.4 Feed TDS concentration mg/L 2000 Permeate TDS concentration mg/L 100 Recovery % 80 Determine the change in system performance (permeate flow and salt passage) that has occurred between January 1 and May 31. Assume = 1.0.

Answer rating: 100% (QA)

To determine the change in system performance between January 1 and May 31 we can calculate the salt passage and permeate flow for both dates and comp... View the full answer