Product Category
Reverse Osmosis System For Water Treatment Device

What Is Reverse Osmosis System
Reverse osmosis devices are frequently used to remove salt and most other inorganic material present in the water. The average RO system is a unit consisting of a sediment/chlorine pre-filter, the reverse-osmosis membrane, a storage tank, and an activated-carbon post-filter.

 RO Treatment Principles
RO is based on the principle of osmosis. In osmosis, a membrane separates two solutions containing different amounts of dissolved chemicals. The membrane allows some compounds like water to pass through it, but does not allow larger compounds through. Pressure differences cause pure water to pass through the membrane from the dilute to the more concentrated solution. The pressure is called osmotic pressure and this process is osmosis. The natural tendency is for water to move through the membrane from the dilute to the concentrated solution until chemicals reach equal concentrations on both sides of the membrane. In reverse osmosis, pressure is applied to the concentrated side of the membrane.

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This forces the osmotic process into reverse so that, with adequate applied pressure, pure water is forced from the concentrated side to the dilute side. Treated water is collected in a storage container.

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RO Membrane Introduction
RO membrane is the important part of RO system. The membranes are made from materials such as thin organic polymer films, metals or ceramics, depending on the application. They are manufactured in different forms such as hollow fibers or flat sheets, which are incorporated into housing modules designed to produce optimal hydrodynamic conditions for separation. Complete systems comprise arrangements of modules, together with the interfaces and control systems needed to integrate them into the various process configurations. Membrane performance is generally defined in terms of two factors:


Flux — the amount of water passing through the membrane per unit of time and surface area. This has a strong impact on the capital costs of the process and hence influences the economic feasibility.
Selectivity or retention — the concentration ratio of a component between the filtered "permeate" and the input feed water, which is a main determinant of the technical feasibility of a process.
Stages of Filtration
•Sediment Stage: removes rough particles, sand and rust.
•Carbon stage: removes chlorine and chemicals which would otherwise damage the reverse osmosis membrane.
•Reverse osmosis stage: removes dissolved solids and virtually everything larger than the water molecule itself. This is where the bulk of the purification is accomplished.
•Remineralization Stage: water purified by reverse osmosis is highly pure and slightly acidic. Remineralizing with calcium and magnesium to balance the pH, improve the taste and introduce healthy minerals.
•Storage tank
•Optional or application specific water treatment stage(s): UV filter to destroy microorganisms, nitrate/arsenic/fluoride/deionization selective filters to remove whatever small amount remains of these contaminants.
•Final Carbon stage: also known as a "polishing" filter this carbon filter removes any tastes or odors the acidic RO water has "picked up" from the storage tank.