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A Reverse Osmosis (RO) having the following characteristics was selected to treat a drinking water source with high total dissolved solids. Desired fresh water flow

A Reverse Osmosis (RO) having the following characteristics was selected to treat a drinking water source with high total dissolved solids.

Desired fresh water flow rate = 16000 m3/d

Permeate recovery = 80%

Salt rejection = 92%

Membrane flux = 0.83m3/m2. d

Membrane packing density = 800 m2/m3

Membrane module volume = 0.03 m3

Pressure vessel capacity = 10 modules

How many pressure vessels are required to treat the water?

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