UF Description
In a GREENSIGN UF the hollow fibers are only 1.3 mm O.D. x 0.7 mm ID and are made from H-PVDF polymer ( H=hydrophilic). These fibers have high resistance to chemicals, heat, and fouling, and are mechanically strong. In the modular design, the hollow fibers are bundled inside a PVC shell, ranging in size from 6.5” to 8.9” OD. These modules are positioned vertically on a skid to form a UF rack that can be pre-piped and pre-wired and ready for installation on-site. (Note: Dow UF is shown for the sake of consistency throughout this discussion. Other brands of UF will vary in design and procedures.) In addition to the hollow fiber modular design, UF is also sold in flat sheet, spiral-wound, plate-and-frame, tubular module, and loose fiber bundle configurations.
Since the filtration flow path in a Dow UF hollow fiber is outside-to-inside, the contaminants from the feed will accumulate on the outside of the fibers, much like a cartridge filter that is familiar to all water purification. The purified water will flow through the center of the hollow fiber to be collected at the top of each module as filtrate. The outside-in flow as opposed to inside-out has the advantage that the contaminants have more area on the outside of the fiber on which to accumulate, thereby extending the run time between backwashes and cleanings. Also, with flow on the outside and with a vertical design, an air-scour bubbling (upward through the shell on the outside of the fibers) can be used to shake particles loose from the fibers prior to backwash cleanings. So, unlike a cartridge filter in which the elements have to be replaced when they are loaded with contaminants, the UF has permanent elements (hollow fibers) that can be cleaned by backflushes, air scouring, and eventually by stronger CIP operations. This gives the UF a long service life, finer filtration, and much less maintenance than a replaceable filter element.
Product Details:
Minimum Order Quantity | 1 Unit |
Material | PVDF |
Usage/Application | Industrial |
Filter Type | ULTRA FILTRATION PLANT |
Type Of Machines | U Literati Filtration |
Filter Medium Material | Microfiber |
Flow Rate | 500-1000 LPH |
Brand | GREENSIGN |
Capacity | 1000 LPH |
Model Type | GSSAC UF 1000 LPH |
Outside Diameter | 60-80 mm |
Inside Diameter | 40-60 mm |
Maximum Differential Pressure | 30psi (2.1bar) |
Frequency | 50-60Hz |
Voltage | 380V |
Size | 4040 * 4 |
Country of Origin | Made in India |
Ultrafiltration, also known as UF, is a class of filtration that uses a membrane, either in the form of a spiral wound element similar to a reverse osmosis membrane, or more often, a tubular element known as a hollow fiber. Other types of membrane filters are Microfiltration (MF), Nanofiltration (NF), and Reverse Osmosis (RO). These differ primarily in the sizes of particles that are excluded from the filtered water. Ultrafiltration and Microfiltration are size-exclusion processes that reject particles, pathogens, and high molecular weight species. UF has pore sizes in the range of 0.001 to 0.1 micron, with a 0.03 nominal micron rating being typical.
UF is often used as pretreatment to an RO. The UF removes the majority of particulates that fouls an RO, as well as colloids, harmful bacteria, most viruses, and parasites such as cryptosporidium and giardia. The RO removes the remaining bacteria and viruses, dissolved salts, dissolved organics, color, taste, and odor.
UF Benefits to RO Operation
The UF acts as a barrier filter, retaining any particles over 0.1 micron. This allows the RO to operate at a higher design flux and therefore higher total flow, to increase production, or to produce the same flow as before but with less energy. In a new installation, a smaller RO can be used. With UF pretreatment, the RO has reduced requirements for membrane cleaning, meaning that chemical usage and wastewater discharges are reduced. Longer membrane life is also a benefit.
UF Applications
Beverage Water Preparation- UF is used to remove particles, viruses, bacteria, and parasites from city or other source waters used in bottled water or beverage production, usually as feed to an RO.
Additional Information: