A Guide to Reverse Osmosis (RO) - Emerging Technology of Water Industry [PDF]
Reverse osmosis (RO) is defined as a water purification method which is mainly used to remove ions, molecules, and larger particles from water. This technology incorporates a semi-permeable membrane, which is composed of cellulose and other materials. These membranes helps to eliminate dissolved salts or organic molecules. Such membranes are used across several application bases such as brackish water treatment, desalination of seawater, industrial water treatment and many others. It is considered to be most economical and practical technique of purifying and treating drinking water.
Reverse osmosis (RO) and Nanofiltration (NF) membranes are commonly used as a filtration method to remove many types of dissolved solids (large molecules and ions) from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.
Reverse Osmosis (RO) has witnessed significant growth owing to factors such as a rise in awareness towards water scarcity. Further, strict government regulations are significantly increasing their demand in the global Reverse Osmosis (RO).
To understand the purpose and process of Reverse Osmosis you must first understand the naturally occurring process of Osmosis.
Osmosis is a naturally occurring phenomenon and one of the most important processes in nature. It is a process where a weaker saline solution will tend to migrate to a strong saline solution. Examples of osmosis are when plant roots absorb water from the soil and our kidneys absorb water from our blood.
Below is a diagram which shows how osmosis works. A solution that is less concentrated will have a natural tendency to migrate to a solution with a higher concentration. For example, if you had a container full of water with a low salt concentration and another container full of water with a high salt concentration and they were separated by a semi-permeable membrane, then the water with the lower salt concentration would begin to migrate towards the water container with the higher salt concentration.
Reverse osmosis (RO) and Nanofiltration (NF) membranes are commonly used as a filtration method to remove many types of dissolved solids (large molecules and ions) from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.
Reverse Osmosis (RO) has witnessed significant growth owing to factors such as a rise in awareness towards water scarcity. Further, strict government regulations are significantly increasing their demand in the global Reverse Osmosis (RO).
To understand the purpose and process of Reverse Osmosis you must first understand the naturally occurring process of Osmosis.
Osmosis is a naturally occurring phenomenon and one of the most important processes in nature. It is a process where a weaker saline solution will tend to migrate to a strong saline solution. Examples of osmosis are when plant roots absorb water from the soil and our kidneys absorb water from our blood.
Below is a diagram which shows how osmosis works. A solution that is less concentrated will have a natural tendency to migrate to a solution with a higher concentration. For example, if you had a container full of water with a low salt concentration and another container full of water with a high salt concentration and they were separated by a semi-permeable membrane, then the water with the lower salt concentration would begin to migrate towards the water container with the higher salt concentration.
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