Question: -1 Reverse osmosis membrane filtration is to be used to treat brackish (saline) groundwater to supply drinking water for a NSW regional city. Feed

-1 Reverse osmosis membrane filtration is to be used to treat brackish

-1 Reverse osmosis membrane filtration is to be used to treat brackish (saline) groundwater to supply drinking water for a NSW regional city. Feed water will be provided at a flow rate of 25,000 m.day and TDS concentration of 2,200 g/m. The plant is required to produce a permeate with TDS 400 g/m and water recovery of 85%. Assume: Water mass transfer coefficient 1x106 s.m Solute mass transfer coefficient 6x10-8 m.s Average osmotic pressure gradient = 160 kPa Average imposed transmembrane pressure gradient = 1500 kPa Note: The SI unit for pressure is pascal (Pa), equal to one newton per square meter (N/m or kg.m.s-). -1 Determine: -1 (a) The permeate stream flow in units of kg.s (3 marks) (b) The required membrane area (4 marks) (c) TDS rejection rate (4 marks) (d) Concentration of TDS in the concentrate stream (4 marks)

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a The permeate stream flow Qp can be calculated using the formula Qp QfR where R 1 CpCf Cp is the de... View full answer

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