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Reverse osmosis filter

Reverse osmosis is a novel membrane separation technology that emerged in the 1960s. It relies on a reverse osmosis membrane to separate solvent from solute in a solution under pressure.

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Filtration equipment

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Product Description

Product Introduction
Reverse osmosis is a novel membrane separation technology that emerged in the 1960s. It relies on a reverse osmosis membrane to separate solvent from solute in a solution under pressure.
To understand the principle of desalination by reverse osmosis, one must first grasp the concept of “osmosis.” Osmosis is a physical phenomenon: when two bodies of water with different salt concentrations are separated by a semipermeable membrane, water from the less saline side will pass through the membrane into the more saline side, while the dissolved salts remain on their respective sides. Over time, this process gradually equalizes the salt concentrations on both sides. However, achieving this equilibrium typically requires a considerable amount of time; this process is known as natural osmosis. If, instead, a pressure is applied to the side with the higher salt concentration, the osmotic flow can be halted. The pressure required to stop osmosis is called the osmotic pressure. By further increasing this pressure, it becomes possible to force water to move in the opposite direction, leaving the salts behind. Thus, the principle of reverse osmosis involves applying a pressure greater than the natural osmotic pressure to a saline solution—such as raw water—forcing the solvent (water) to move in the reverse direction. This pushes the water molecules through the membrane to the other side, producing purified water and thereby removing dissolved salts from the feed water. This is the fundamental principle underlying reverse osmosis desalination.

Working principle
Reverse osmosis technology, also known as RO (Reverse Osmosis), primarily relies on the pressure difference across a membrane to drive separation and filtration. By applying pressure to one side of the membrane at a level exceeding the solution’s osmotic pressure, solvent molecules—such as water—will permeate in the opposite direction, thereby separating these substances from the solvent.

Product Features
I. Material and Structure
Material: Typically, a cylindrical shell is used, with 304 or 316L stainless steel being the most common choices. These materials offer excellent corrosion resistance and mechanical strength, making them suitable for a wide range of water quality conditions. Additionally, custom fabrication is available using carbon steel or resin‑based shells, depending on customer requirements.
Filter cartridges: The number, length, and mounting configuration of filter cartridges are highly flexible, allowing selection based on specific application requirements. Filter cartridge ratings are expressed in microns (μm), with common specifications including 0.22, 0.45, 1, 5, 10, 20, 50, 75, and 100 μm, catering to a wide range of filtration precision needs.
II. Filtration Performance
High filtration precision: Reverse osmosis filters employ filter media with extremely small pore sizes—such as reverse osmosis membranes, whose pores measure just 0.0001 microns—effectively removing trace contaminants from water, including chemical ions, bacteria, fungi, and viruses, thereby ensuring exceptionally pure effluent quality.
Strong contaminant‑trapping capability: Thanks to its uniformly small pore size, the filter element boasts a high contaminant‑retention capacity, effectively capturing and removing suspended solids, colloids, organic matter, and other impurities from water.
Long service life: The filter element material boasts high cleanliness, does not contaminate the filtration medium, and is resistant to acids, alkalis, and other chemical solvents, enabling stable long-term operation even in harsh water-quality conditions.
III. Operation and Maintenance
Easy to clean: The filter element is replaceable and easy to wash, reducing maintenance costs.
Low operating costs: Thanks to the low cost and easy availability of filter media, the overall operating expenses are relatively low.
Automatic Control: Some reverse osmosis systems feature automatic control capabilities, enabling them to dynamically adjust operating parameters based on feedwater quality and product water demand, thus achieving intelligent management.
IV. Wide Range of Applications
Reverse osmosis filters are widely used in drinking water treatment, industrial water treatment, seawater desalination, wastewater treatment, food processing, and the pharmaceutical industry. In these applications, reverse osmosis filters deliver highly efficient filtration, removing harmful substances and impurities from water to ensure water quality that is both safe and stable.