Water purification

Reverse Osmosis

The Reverse Osmosis (RO) is a process of separation which employs pressure to force a solvent through a membrane which keeps the impurities on one side and allows the pure solvent to pass to the other side. It is the process to forcing a solvent from an area of high solute concentration through a membrane to an area of low solute concentration by applying a pressure in excess of the osmotic pressure. It is the reverse of the normal process of osmosis, which is the normal movement of the solvent of a region of low concentration through a membrane, to a region of high concentration when there is no application of external pressure. The membrane here is semi-permeable, meaning that it allows the passage of the solvent but not solute. RO systems were successfully applied to a variety of metal finishing operations such as copper, nickel, zinc, electroplating; and in dyeing industries.

The membranes used for the reverse osmosis have a dense barrier layer in the polymer matrix where the majority of separation occurs. . In most cases the membrane is designed to allow only the passage of water through the dense layer and thus preventing the passage of solutes.  This process requires high pressure to be exerted side on high concentration side of the membrane. This process is most known for its use in desalination, but also useful for the purification natural fresh water for the medical and industrial. Reverse osmosis techniques are used for the purpose of desalination and the purification of brackish water and sea water for drinking and industrial purpose. This can also be employed for a variety of specialized membrane projects such as chemical recovery and waste water treatment.

The reverse osmosis is mainly employed for the filtration of water. The reverse osmosis method of water treatment is employed most of the time to lower the quantity of solid waste. Chemicals such as sodium, nitrate, and sulphate are taken out of water through the process of reverse osmosis. The use of a carbon filter in the reverse osmosis method of water treatment will help to reduce the quantities of pesticides, chloroform, and all other micro organism.

Reverse osmosis machine is composed of various parts. These parts include a filter which holds behind all the big pieces or particles passing through it. The storage tank is the next part of the reverse osmosis equipment. It holds the water which was filtered. The post filter takes the water from the tank and process the water to remove it from bad taste and smell or any other reside which may sometimes exists after the first treatment of filtration. The last process is storing the filtered water.

The reverse osmosis implies the process of separating water from a solution of dissolved solid matters by forcing water through a semi permeable membrane. While pressure is applied to the solution, water and other molecules with low molecular weights passes through the micro pores in the membrane. Moreover larger molecules, such as the dyes and the organic metal complexes are kept by the membrane. The purified water which passes through the membrane is known as permeable, and the concentrated stream containing a high concentration of the dissolved solid matters is called the concentrate.

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