There is a vast amount of water on earth. However, over 97% of it is
too salty for human use and only a small part of the rest is easily accessible
in rivers, lakes or groundwater. The available supplies of fresh water are
subject to danger due to growing population, climate change, droughts etc.
As water becomes scarcer, people start finding several ways to secure
their water supplies. Many countries of the world have enormous possibilities
to use water more efficiently, and that would be cheaper than other filtration
systems. Home made reverse osmosis sap systems are one such possibility.
Home made reverse osmosis sap system are used to turn sea water into a
drinkable form.
Keeping in view the process of osmosis, scientists discovered that
osmosis could be reversed by applying pressure to the more concentrated
solution, causing water molecules to disperse through the membrane and leave
behind more highly concentrated salt water.
In order to consider the movement of waters, the partition between the
two compartments and the force caused by the externally applied pressure are
given importance so that the solute cannot move from areas of high pressure to
areas of low pressure, because the membrane is not porous to it.
Only water can move in this way. When the effect of the outward applied
pressure is more than that of the absorption difference, all of the water will
move from area of high concentration to the area of low concentration, and in
this way the water is obtained through home made reverse osmosis system.
An important advancement in the purification of water through home made
reverse osmosis sap systems came from the sugar industry, where large amounts
of fuel were required to heat the sugar sap and evaporate the water it
contained, in order to produce crystalline sugar.
Seawater generally contains 33-37 grams of dissolved solids per litre
and to turn it into drinking water, nearly 99% of these salts must be removed.
In many countries, household drinking water filtration methods include
a reverse osmosis technique for improving the quality of water for drinking and
cooking.
There are now 13,080 home made reverse osmosis sap systems working
around the world. Together they have the capacity to produce up to 55.6m cubic
meters of drinkable water a day which makes up about 0.5% of global water use.
This is no doubt a remarkable achievement in the field of domestic
water purification.
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