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- What is the flux considered while designing a reverse osmosis system for treating bore well water?Option: 1 10-15 LMH<div class='qna-op
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What is the flux considered while designing a reverse osmosis system for treating bore well water?
10-15 LMH
40-50 LMH
20-30 LMH
60-70 LMH
Answers (1)
As we have learnt,
Reverse Osmosis -
The direction of osmosis can be reversed if a pressure larger than the osmotic pressure is applied to the solution side. That is, now the pure solvent flows out of the solution through the semi-permeable membrane. This phenomenon is called reverse osmosis and is of great practical utility. Reverse osmosis is used in desalination of seawater. A schematic set up for the process is shown in Figure given below. When pressure more than osmotic pressure is applied, pure water is squeezed out of the seawater through the membrane. A variety of polymer membranes are available for this purpose.
The pressure required for the reverse osmosis is quite high. A workable porous membrane is a film of cellulose acetate placed over a suitable support. Cellulose acetate is permeable to water but impermeable to impurities and ions present in seawater. These days many countries use desalination plants to meet their potable water requirements.
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The flux increases with increase in pressure. It also increases with increased temperature. In case of bore well water, the flux considered is 20-30 LMH.
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