TriSep Corporation

- Specialty Membrane Elements


TriSep offers a broad array of spiral wound membrane products. With one of the broadest selections of of RO, NF, UF, and MF membrane chemistries, TriSep can deliver a product for your specific requirement. In addition, TriSep offers several construction varieties including sanitary TurboClean, high pressure, high temperature, and different thickness feed spacers. Elements can be custom engineered to meet specific application requirements.

Typical Element Diameters

  • 2.5 in
  • 4 in
  • 8 in
  • 8.3 in
  • 8.5 in
  • 3.8 in (Sanitary Use)
  • 6.3 in (Sanitary Use)
  • 8 in (Sanitary Use)

Element Lengths

  • 40 in
  • 38 in (Sanitary Use)
  • 38.75 in (Sanitary Use)
  • Custom Lengths Upon Request

Outer Wrap Materials

  • Chemical Resistant
  • Custom Wrap Material Upon Request
  • Fiberglass
  • Tapewrap
  • TurboClean Sanitary Net Wrap

Feed Spacer Design

  • Asymmetric Channel
  • Diamond Channel
  • Open Channel
  • Parallel Channel

Feed Spacer Thickness

  • 28 to 125 mils

Membrane Options

  • Reverse Osmosis
  • X-20™ Low Fouling
  • High Rejection
  • Low Energy
  • Cellulose Acetate
  • Nanofiltration
  • Softening NF
  • Desalting NF
  • Cellulose Acetate
  • Ultrafiltration/Microfiltration
  • PES, PVDF and Polyamide
  • Molecular Weight Cut-Off: 3kDa
  • Custom Membranes Upon Request

Design Considerations

  • Classic design up to 45°C / 600 psi
  • Hot water sanitizable
  • High temperature 80°C continuous
  • Warm temperature 60°C continuous
  • High pressure 1000 psi max
  • Ultra-high pressure 1500 psi max

Low Fouling RO Membrane
Almost all commercially available reverse osmosis membranes available today are based onthe chemistry patented by John Cadotte, patent number 4,277,344 (‘344). Most recentimprovements in the RO industry have come from optimizing either the flux or the rejectionof the ‘344 chemistry. This chemistry is classified as a fully aromatic polyamide, but hasresidual carboxylic acid groups on the surface which have a negative charge. Improvementsin the ‘344 membranes have resulted in high flux and high rejection membranes. However,one of the major problems with the ‘344 membranes is that they are very susceptible toorganic and particulate fouling, which results in decreased performance and increasedoperating costs.

Developed by DuPont and commercialized by TriSep, a new fouling resistant RO membranechemistry was created with the X-20. This new RO membrane, commercially known as the X-20TM, has a different barrier layer, which is classified as a fully aromatic polyamide-urea.This new barrier layer, which has residual amino groups on the surface, which are neutral atmost operating pH's, has proven superior in critical areas of reverse osmosis operationincluding fouling resistant property. This property represents a major breakthrough in ROtechnology.

The X-20 has been so succesful, that many competitors have tried to imitate it. Theseimitations are typically standard '344 membranes with a surface coating. The X-20's lowfouling characteristics come from it's unique and patented poly amide-urea chemistry. Thisproperty is built into the polymer backbone and cannot wash off. The surface coatings oncompetitive products lack the durability of the X-20.

In summary, the benefits seen in system performance when using the X-20TM spiral woundelements include: significantly lower organic fouling, consistent overall salt rejection of 99% , consistently high silica rejection of 99% , lower and consistent system delta-P, systemmaintainability, ease of cleaning and returning performance back to start-up conditions,system durability, and up to 2700 cleaning hours with little loss in performance.

For your difficult RO applications, choose the leader and still the best, TriSep's X-20TM.

High Rejection, High Flow RO Membranes
TriSep offers five versions of it's popular ACM series reverse osmosis membrane elements.The ACM line is the workhorse of theTriSep RO line. It delivers high flux and high rejectionin a durable and economical membrane. The membrane has a good combination of chemicalresistance and mechanical strength. This is exhibited by wide operating pH ranges (2-12),some resistance to oxidants such as chlorine (up to 2,000 ppm-hrs) and hydrogen peroxide,and pressures up to 1,000 psi (70 bar) with the proper construction.

ACM RO membranes typically have higher salt (NaCl) rejection than cellulose acetate ornanofiltration membranes, but in the ACM4 and ACM5 configurations have high specificflux rates and can, therefore, operate at lower feed pressures. ACM RO membranes have theability to reject a wide range of feed species, specifically: particulates, colloidal andmicrobiological species, hardness, sulfate and other multivalent ions, and soluble lowmolecular weight (> 200 Daltons) neutral and charged organic compounds.

The ACM product line is available in 5 versions. The ACM1 and ACM2 offer the highestrejection (99.5%) and typically operate at 150 - 200 psi (10 - 14 bar). The ACM2 is one ofour most popular membrane elements. It is a defacto standard for typical water purificationrequirements. The ACM1 and ACM2 are preferred in applications with high feedwater TDS(>3,000 ppm) and/or high recovery. The lower specific flux of these membranes compared tothe ACM4 and ACM5 allows for a more balanced hydraulic flow through the system andmore balanced permeate flux rates due to the high osmotic pressure of these feedwaters.For applications where a lower operating pressure is required but you still need very high saltrejections, the ACM3 may fit the bill. This membrane typically operates at 125 - 175 psi (9 -12 bar) but still maintains a very high salt rejection (99.5%).

For ultra low pressure operation, the ACM-LP line of ACM4 and the new ACM5 may be thebest choise. These membranes have extremely high specific flux, comparable to NFmembranes, while still offering excellent salt rejection (98.5-99.2%). These membranestypically operate at feed pressures of 75-150 psi (5 - 10 bar). Due to the high specific flux,these membranes are best suited to applicaitons with relatively low TDS (<3,000 ppm) toachieve balanced flux rates within the system.

Nanofiltration Membranes
TriSep offers two different nanofiltration (NF) membrane chemistries, the TS80 and the XN45.Both are based on proprietary and patented technology developed by DuPont. The uniquechemistries of these membranes allow them to have lower organic fouling than standard '344type NF membranes. The TS80 is typically used in municipal membrane softening applications.It has a higher relative sodium chloride rejection (~90%) than the XN45 (~30%). The TS80, orits higher flow cousins, the TS82 and TS83, are excellent choices to remove THM precursors,color, iron, and hardness from surface and well waters. The XN45 is typically used in processapplication where there is a desire to allow monovalent ions to pass through the membrane willrejecting divalent ions or low molecular weight organic molecules such as sugars. NF is amembrane process which can be applied to the treatment of a variety of water supplies withmany economic and process advantages.

NF membranes typically have lower salt (NaCl) rejection than reverse osmosis membranes, buthave higher specific flux rates and can, therefore, operate at lower feed pressures. NFmembranes have the inherent ability to reject or separate different feed species, specifically:particulates, colloidal and microbiological species, hardness, sulfate and other multivalent ions,and soluble low molecular weight (> 200 Daltons) neutral and charged organic compounds.

The TS80, TS82, and TS83 nanofiltration (NF) membranes are based on proprietary andpatented technology developed by DuPont. The unique chemistry of these membranes allowthem to have lower organic fouling than standard '344 type NF membranes. These memebrnaesare not hydrolyzed or oxidized standard ACM type RO membranes, but rather are formulated tonaturally have the flow and rejection properties of a NF membrane. This makes the TS80 morerobust and have better chemical resistance than a NF membrane that is made by degrading a ROmembrane. All TS80 elements are factory tested on MgSO4 and water solutions.

Cellulose Acetate RO Membranes
Cellulose acetate (CA) membranes were the first commercialized RO membranes developed inthe late 1960's. CA membranes offered a good combination of rejection, fouling resistance, andthe ability to tolerate continous chlorine up to 1.0 ppm. Some of the reasons they lost favor tothe new polyamide membranes was the requirement for acidification (CA membranes should beoperated at a pH of between 4-6 to minimize hydrolysis), lower rejection (98% versus 99.5%)and higher net drive pressure requirements (300 psi/20 bar versus 150 psi/10 bary).

But in many applications, CA membranes operate very well and give long and usefull servicelifes. They have an advantage over the newer polyamide membranes for applications with highorganic fouling, such as wastewaters, and waters where biological growth is an issue (easilyaddressed using chlorine). There is large installed base of CA membranes in many differentapplications, and the SB series of membrane elements from TriSep can satisfy most retrofittingor new system applications.

The SB series of membrane elements from TriSep are available in 2.5', 4', 8', 8.3', and 8.5'diameters. There are three different membranes offered, the SB20, SB50, and SB90. The SB20offers the highest rejection at 98%, while the SB50 offers 20% higher flow at 95% salt rejection.The SB90 is a nanofiltration (NF) membrane operating at about twice the flow of the SB20 at85-90% rejection.

Beverage Industry

  • Beer Dealcoholization
  • Beer Kettle Condensate Recovery
  • Beverage Water Make Up
  • Fruit Juice/Must Concentration Refinement

Dialysis Application

  • Dialysis Make up Water
  • Hemodialysis

Dairy and Food Industries

  • Animal Feed
  • Coffee Extract Concentration
  • Egg Concentration
  • Evaporator Condensate Recovery
  • General Food Waste Water
  • Lactose Concentration
  • Lactose Demineralization
  • Meat Processing
  • Milk Fractionation
  • Steam Recovery
  • Sugar Concentration
  • Sugar Refining/Starch Removal
  • Tea Concentration
  • Whey Concentration
  • Whey Electro Dialyses Recovery

Pharmaceutical Industry

  • Bacteria Concentration
  • Enzyme Concentration
  • Enzyme Fractionation
  • Peptide Concentration
  • Peptide Demineralization
  • Pharmaceutical Make Up Water
  • Pharmaceutical Process Water
  • Pharmaceutical Separations
  • Pyrogen Free Water
  • Ultrapure Water Particle Removal

Industrial Applications

  • Agricultural Waste Water
  • Boiler Condensate Recovery
  • Chemical Waste Water
  • Cooling Water Blowdown Recycle
  • Nitrate Removal
  • RO Pretreatment
  • Ultra Pure Water

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