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The Basic Principle of Reverse Osmosis (Nanofiltration)

The phenomenon whereby pure water passes through a semipermeable membrane from the low-salinity side to the high-salinity side is called osmosis. Osmosis demonstrates that when a semipermeable membrane is placed between two compartments, it permits certain substances to pass while rejecting others.

2022

Common Issues and Solutions for Nanofiltration Membranes

Nanofiltration membranes are a common product in the water treatment industry, capable of filtering, separating, and purifying a wide range of substances. As such, they are widely used across many sectors and deliver excellent performance.

2022

Principles of Operation and Application Scope of Nanofiltration Membranes in Water Treatment

Nanofiltration membranes have pore sizes on the nanoscale, allowing water to pass through completely while retaining or partially retaining substances with molecular weights larger than that of water. For ions, the higher the ionic valence, the greater the membrane’s rejection rate.

2022

Nanofiltration and reverse osmosis membranes for treating nickel-plating wastewater

The process of depositing a nickel coating on the surface of metals or certain nonmetals by electrolytic or chemical means is known as nickel plating. Nickel plating encompasses both electroless nickel plating and electroplated nickel. In electroless nickel plating, metallic nickel serves as the anode, the workpiece acts as the cathode, and direct current is applied. Within an electrolyte composed of a nickel salt (the primary salt), conductive salts, a pH buffer, and a wetting agent, a uniform, dense nickel layer is deposited onto the cathode (the workpiece). Bright nickel is obtained from a plating bath containing brightening agents, whereas dark nickel is produced in an electrolyte devoid of such agents.

2022

Advantages of Nanofiltration Membranes

Nanofiltration is a relatively new membrane process, typically employed with water of low total dissolved solids content—such as surface water and fresh groundwater—to achieve softening (by removing polyvalent cations) and to remove disinfection by-product precursors, including natural organic matter and synthetic organic compounds.

2022

Which is better: nanofiltration membrane or reverse osmosis membrane?

Nanofiltration membranes and reverse osmosis membranes are both used in the fine filtration stage of industrial water treatment, and both offer extremely high filtration accuracy. So, when comparing nanofiltration and reverse osmosis membranes, which one is better suited for your needs?

2022

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