-1 Reverse osmosis membrane filtration is to be used to treat brackish (saline) groundwater to supply...

 

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-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 m³.day ¹ and TDS concentration of 2,200 g/m³. The plant is required to produce a permeate with TDS 400 g/m³ and water recovery of 85%. Assume: ● Water mass transfer coefficient 1x10˚6 s.m³¹ Solute mass transfer coefficient 6x10-8 m.s¹ 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/m² or kg.m¯¹.s-²). -1 Determine: -1 (a) The permeate stream flow in units of kg.s¹ (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) -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 m³.day ¹ and TDS concentration of 2,200 g/m³. The plant is required to produce a permeate with TDS 400 g/m³ and water recovery of 85%. Assume: ● Water mass transfer coefficient 1x10˚6 s.m³¹ Solute mass transfer coefficient 6x10-8 m.s¹ 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/m² or kg.m¯¹.s-²). -1 Determine: -1 (a) The permeate stream flow in units of kg.s¹ (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)

Answer rating: 100% (QA)

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