Reverse Osmosis Water Treatment

by Joanne

Mainstreamly, reverse osmosis water treament is know for its uses in desalination of sea water into drinking water. However recently this has seen such great results, that it has been successfully introduced for cleaning and filtering drinking water at home. More and more homeowners buy this system for their own purposes, and this allows them not only to get pure water, but also get water cheaper in the long run.

This method greatly reduces the amount of bacteria, organics and inorganics in the drinking water. Of course, other treatment types remove various other contaminants, so homeowners should carefully consider which treatment is best for their own drinking water.

The reverse osmosis water system is based on osmosis, a known process for filtering impurities from water. Basically through osmosis the water is moved from one side of a filtering membrane to the other side by using pressure that is applied to the dirty water in order for the pure water to pass through the membrane. This effectively leaves the contaminants behind, as they mostly can't pass through the membrane.

Basically how much pressure is applied to the water is determined by the concentration, strength and type of the water contaminants. The more pressure is applied, the better the filtering process. Through reverse osmosis most contaminants get removed, however not all. It mostly depends on the chemical properties and molecules of the actual contaminant, as well as the type of the membrane and the operating conditions.

The efficiency of polutant removal is mostly named as 'rejection percentage'. This basically is the percentage of the impurities that don't pass through the membrane. The higher the percentage, the pure the resulting water. By knowing exactly the incoming impurities concentration and the rejection percentage in order to effectively reduce contaminant concentrations in the drinking water to safe levels.

The main components of a reverse osmosis water treatment are:

• Pre-filter that removes fouling agents including rust and lime
• Reverse osmosis module that contais the membrane
• Activated carbon post-filter that removes the residual taste, smell or various components from the resulting clean water
• Storage tank
• Shut-off valve to stop the water flow when the storage tank becomes full
• Waste flow to drain

You can generally buy all these components at your local seller.

For upkeeping the proper performance of this system, it needs regular maintenance and replacement of various parts when it is needed. Particularly the pre-filter and the post-filter should be replaced regularly.

When it comes to the disadvantages of the reverse osmosis water treatment, one can mostly think about the huge amount of water that is regularly wasted here. Many times this can raise to 50-90%. It really depends on the pressure difference across the membrane, meaning that the larger the pressure difference, then smaller will be the rate of the water wastage. However, all in all, this is a well known and popular equipment for home use when it comes to getting clean and pure water for drinking.

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