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DOW FILMTEC Ultrafiltration Modules

Pure Aqua, Inc. engineers and manufactures the most advanced Ultrafiltration (UF) systems for water treatment purposes that fit the needs of different industries and applications such as chemical and pharmaceutical manufacturing, food and beverage processing, and wastewater treatment.

Ultrafiltration (UF) systems have diverse membrane filtration where hydrostatic pressure pushes solvents against a very fine membrane. They block suspended particulates and solids that are large while water and solutes with a lower molecular weight are allowed to flow through the membrane.

Industry and research employ this separation process for purifying and concentrating macromolecular (103 - 106 Da) solutions, which are usually protein solutions. Ultrafiltration is similar to microfiltration, nanofiltration or gas separation, except it differs in the molecule sizes it blocks.

To meet critical discharge criteria, ultrafiltration systems remove the need for clarifiers and multi-media filters. Effective ultrafiltration systems use membranes that can be immersed, back-flushable, and air scoured. Hollow fiber UF/MF membranes offer excellent performance for the clarification of process water and wastewater.

Benefits of DOW Ultrafiltration Modules

  • Unmatched purifier of particles, suspended solids, colloids, and heavy metals
  • Terrific pre-treatment for reverse osmosis systems
  • Larger surface area membrane characteristics (i.e. high flux)
  • Small footprint and exceptional packing availability
  • Nullifies chemical exhaustion
  • Immense chemical resistance which makes way for consistent chemical usage for purifying extremely contaminated water when necessary
  • Strong mechanical fibers that create long-lasting membrane performance, easy maintenance, and reliable operation
  • High tolerance for all temperature and feeding solids
  • Little requirement for pre-treatment in order to treat highly contaminated water

What are Dow Filmtec Ultrafiltration membranes?

Dow Filmtec Ultrafiltration Modules are configured with highly durable hollow fiber membranes that provide the following characteristics:

  • Nominal pore diameters to induce effective eradication of particulates, viruses, and bacterial microorganisms
  • Polymeric hollow fibers that provide great durability and resilience to chemicals
  • Hydrophilic fibers for effortless washing and dosing to ensure long-lasting performance
  • Efficient outside-in flow process. Creates increased toughness for feeding solids
  • Housings to terminate the necessity for pressure vessels and provide resistance to UV light

Can I clean a Dow Filmtec Ultrafiltration membrane?
One of the biggest problems regarding ultrafiltration membranes is fouling. Ultrafiltration runs in the dead end configuration so all the suspended solids and other foulants in the feed become trapped in trapped in the pores in the membrane fibers. Due to this problem, these pores must be cleaned on a regular basis. We also recommend to clean the membrane when its productivity begins to decrease. Here are some ways to clean the fouling: 

  • Membrane cleaning: Best used for particulate fouling ( suspended solids, sand and silt)
  • Alkaline Chemically Enhanced Backwash Solution: Used to treat biological microorganisms such as bacteria, and algae
  • Acid Chemically Enhanced Backwash Solution: Treat inorganic material such as scale, or metals
  • Caustic Chemically Enhanced Backwash Solution: Treat naturally occurring organic substances

Differences between Dow Filmtec reverse osmosis and ultrafiltration membranes?

Dow Filmtec’s ultrafiltration membranes are founded from the same principles as that of reverse osmosis membranes. The main distinction between ultrafiltration and reverse osmosis membranes lies within the sizes of the pores. Ultrafiltration membranes have greater pore sizes on average in comparison to reverse osmosis membranes, ranging from 1 to 100 nm. The ultrafiltration process consists of much lower operating pressure than reverse osmosis since the osmotic pressure of suspended solids, and macromolecules are much less than those of small solute molecules. Ultrafiltration membranes are mainly used for turbidity and separating macromolecules, heavy metals, and suspended solids from the feed water, where as reverse osmosis membranes are used to eradicate dissolved solids, bacteria, viruses, and other micro-pollutants. 

Applications of Dow ultrafiltration in water and waste water treatment:

Dow ultrafiltration UF modules  can be used for removal of macromolecules and particulates from raw water to produce potable or process water.

  • Potable water
  • Reverse osmosis pre-treatment
  • Seawater desalination pre-treatment
  • Wastewater reuse
  • Mobile water and containerized systems
  • Grey water

 

Model Type Part Number  Membrane Area Module Volume Weight (empty/water filled)
m2 ft2 Liters gallons kg lbs
SFD-2660 NSF/ANSI 61 Drinking Water 324166 33 355 16 4.2 25/41 55/90
SFD-2860 NSF/ANSI 61 Drinking Water 324168 51 549 35 9.3 48/83 106/183
SFD-2880 NSF/ANSI 61 Drinking water 324169 77 829 39 10.3 61/100 135/220
SFD-2660 NSF/ANSI 61 Drinking Water 324166 33 355 16 4.2 25/41 55/90
SFP-2860 Pretreatment 280933 51 549 35 9.3 48/83 106/183
SFP-2880 Pretreatment 280934 77 829 39 10.3 61/100 135/220

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