What is a Membrane Filter and How Does It Work?Membrane filters are thin plastic films with specific sizes of microspores. These filters are also known as screen, sieve or microporous filters. These are used separate out the microorganisms from various solutions, water and other liquid materials. The membrane utilizes various technologies such as reverse osmosis, ultrafiltration and nanofiltration and others for separating out the micro-organisms. Membrane filters are used for various applications in different industries such as pharmaceutical, food & beverage, chemicals and others.
Filter membranes have different configurations. There are reverse osmosis (RO) membranes, ultrafiltration (UF) membranes, and nanofiltration (NF) membranes. They all approach the membrane filtration process a little bit differently.
Reverse osmosis- applies pressure to a semipermeable membrane that allows the water molecules to pass through while flushing the dissolved inorganic compounds to the drain. So it separates the water into two pathways.
Ultrafiltration- doesn't separate the water like a reverse osmosis membrane. It actually is just an ultra-fine particulate or sediment filter. With mechanical filtration particulate down to 0.025 microns cannot pass through the ultrafiltration membrane.
Nanofiltration membrane technology works very similar to reverse osmosis, except the filtration is not quite as fine.
Membranes are made of different types of materials. With reverse osmosis, they're often referred to as thin-film composite membranes. Previously, the reverse osmosis membrane was made of cellulose triacetate or CTA. CTA membranes are no longer sold. They were the first version of the RO membrane and had a low pH tolerance. They didn't make a lot of water per square inch. Thin-film enables an RO system to make a lot of water in less space, which makes it possible to get larger membranes in smaller housings. This revolutionized the style of reverse osmosis membranes. UF uses the same kind of material with a slightly different formula.
The global membrane filters is segmented on the basis of technology, design, material and application. Based on the technology the market is segmented as microfiltration, reverse osmosis, ultrafiltration, membrane chromatography, nanofiltration, and others. On the basis of design the market is divided into tubular systems, spiral wound, plate & frame and hollow fiber. On the basis of material the market is categorized as polyethersulfone (PES), cellulose-based, polysulfone (PS), polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polyacrylonitrile (PAN), and others. And based on the application the market is classified as diagnosis, drug discovery and development, and esearch & academic applications
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