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Sterlitech is pleased to offer Chemically Resistant and Thermally Stable membranes from Novamem, Switzerland.

PEEK and PVDF membranes are available in 25mm, 47mm disks, and 10x10cm coupons. These are also available in CF016, CF042, and Sepa Cuts.

Materials: PEEK and PVDF

Pore Size: 0.02 and 0.1 micron

PEEK (Polyether ether ketone) membranes are suitable for applications such as:

• Dialyze monomers & polymers in solvents
• Degassing of harsh chemicals
• Membrane pervaporation & membrane distillation
• Battery separators & semiconductor applications
• Nanofiltration & gas separation with user’s specific coating

PVDF (Polyvinylidene fluoride) membranes are suitable for applications such as:

• Degassing of aqueous solutions under high pressure
• Membrane pervaporation & membrane distillation
• Removal of organic impurities from aqueous solutions
• Desalting, removal of ammonium

¹For exceptions, please contact Sterlitech.

To obtain more information about Novamem Membranes, please visit our Chemically Resistant

Sterlitech is pleased to offer a “plug and play” DCMD test cell. The first commercially available bench-scale cross/tangential flow test cell, that mimics conditions representative of large-scale DCMD systems with minimal amounts of membrane or product. This offers researchers fast and accurate performance data to easily evaluate the performance of membranes and/or the membrane separation processes.

“Adding the DCMD test cell to the Membrane and Process Development product line complements this line of product by offering researchers a bench-scale cross/tangential flow test cell for evaluating Temperature-Driven membrane separation processes,”
- said Sepideh Jankhah, Product Manager at Sterlitech Corporation.

How it works: the liquid to be treated is circulated in direct contact with the feed side of the membrane in the Sterlitech’s DCMD cell. A cold liquid solution is circulated in direct contact with the permeate side of the membrane. Both the feed and the cooling solution are circulated

Sterlitech is launching new stir bar assemblies for the HP4750 family of stirred cells. The new design has the following features and benefits:

• A strong magnet for better mixing
• Secure design to eliminate the risk of damage to membrane
• Complete disassembly for cleaning
• Composed of chemical resistant PTFE and SS316 parts

For more information about the new stir bar assemblies, or if you need assistance to find products suited for a specific application, please contact Sterlitech at [email protected]

Researchers from the European Monitoring Center for Drugs and Drug Addiction are zeroing in on public toilets in Europe to identify drug use patterns across the continent. Over the past decade, sewage plant wastewater has been a top source for monitoring drug consumption. However, due to the rising number of new psychoactive substances on the market, scientists have had to come up with new ways to identify suspicious chemicals more effectively. In a recent publishing entitled “Assessing illicit drugs in wastewater”, the EMCDDA expounds on new methodologies for scanning through sewage water to identify drug use trends in different cities. Part of the report includes references to studies that sourced and analyzed wastewater directly from public toilets where drug use was thought to be common. According to the paper, this technique allows researchers to carry out more geographically detailed analyses as well as identify drugs whose uses are still unknown. Through the traditional method, water

When particles of a known and defined size are removed via filtration, it is fairly easy to choose the right filter by simply selecting a pore size smaller than the particle. But what happens when you need to filter a very dirty solution that contains an innumerable amount of particle sizes? If a pore size too small is chosen, a cake layer of debris will form on the membrane surface and foul it completely. If too big of a pore size is selected, then a large portion of the solids will pass right through the filter. Because it could be easily overdone, it’s usually not a good idea to stack multiple filters in the same filter holder and process it all at once. So what is an effective solution to this problem?

Enter the world of pressure drop! Back in 1856, French hydrogeologist Henry Darcy figured out the physics behind fluid flow in a filter medium while he was working in Dijon, France (yes, also the little town that gave us great mustard). Henry figured out that in order to push a liquid

In 2015, the US Food and Drug Administration (FDA) signed off on new legislation to finalize the Food Safety Modernization Act (FSMA), which requires food and beverage manufacturers to be more proactive to minimizing food-borne contamination from microorganisms. The FDA now places more effort on the individual companies to test food products according to the new guidelines in various parts of the production process. These processes can be ideal places to draw fluid samples for bacterial capture and subsequent analysis. The use of membrane filters to evaluate bioburden in these types of liquids is the standard means of recovering and quantifying potentially harmful microorganisms. Does this sound like it makes for more work for the food processors in our communities? It might, but Sterlitech Corporation can help!

According to the new regulations, high-risk food producers will be inspected more frequently, will have to maintain more detailed records, and establish clear food safety plans.

What is silt density index (SDI)?
Silt density index (SDI) estimates the quantity of suspended solids and colloids inside of water. SDI is measured following the ASTM D19.08 Standard Test Method for Silt Density Index (SDI) of Water, using a 0.45 micron membrane. SDI provides information about the fouling potential of water treatment equipment, including membrane filtration systems, and therefore is commonly used in their design and choice.

Is SDI a reliable fouling propensity parameter? How is it used?
SDI is a simple and helpful tool extensively used in pilot or large-scale treatment plants as a standard test to verify the fouling potential of RO and NF membranes. However, using SDI to estimate the fouling intensity of water treatment equipment has some limitations. Even though SDI is measured using a dead-end filtration unit, hydrodynamic conditions in dead-end filtration units are not representative of the hydrodynamic conditions of NF/RO membranes. Hydrodynamic conditions in membranes

 Q: What is Cross Flow Velocity?  

A: Cross flow velocity (CFV) is the linear velocity of the flow tangential to the membrane surface and is reported in [m/sec] or [ft/sec]. CFV affects the hydrodynamic conditions in the cell, and as a result affects the fouling rate and formation of concentration polarization at membrane surface and is calculated by dividing the volumetric flow rate [lpm or gpm] in the flow channel by the cross sectional area [m² or ft²] of the flow channel.  

Q: How is CFV calculated in Sterlitech’s bench-scale test cells?  

A: Example: Calculate CFV in the CF042 cell  

• Flow channel cross sectional area: Channel depth x Channel width* = 0.23 x 3.92 cm
• Flow rate: 1 l/min = 1/60000 m³/s
• CVF = (1/60000 m³/s) / (0.0023 x 0.0392 m)= 0.18 m/s

*Contact us for more information about channel width in CF016 and Sepa cell

Q: How is CFV calculated when shims or feed spacers are inserted in the flow channel?  

A: Adding shims to the flow channel reduces the depth of

Sterlitech teamed up with Senior Engineering Students at California State Polytechnic University, Pomona (Cal Poly Pomona) to evaluate the design of a tangential flow Air Gap Membrane Distillation (AGMD) test cell. Membrane Distillation (MD) is a thermally driven membrane separation technique used for desalination. In this process, the driving force is the difference in the vapor pressure on both sides of the membrane, where permeate travels through a hydrophobic membrane in a vapor phase. Advantages of MD process over conventional distillation or pressure driven separation processes are:

• Low Operating Pressures
• Low Operating Temperatures
• Less Susceptibility to Fouling

These all translate to lower energy requirements that make MD an energy efficient separation process. Scope of the Project: A bench-scale tangential flow test cell is configured in this project where feed solution is circulated tangentially to the membrane in the feed channel on one side and the coolant solution is circulated

Water, oils, and solvents sometimes need to be filtered. But when you see filters labeled as hydrophilic, hydrophobic, and now oleophobic; what does all this mean?  Sterlitech currently offers membrane disc and sheet filters in 10 different polymer types and 4 inorganic filters. 2 of the polymer types are subdivided into 4 subgroups based on surface chemistry alone.

Filters listed as hydrophilic, which has its origins in the Greek language and means water (hydro) loving (philos), love to get wet! Hydrophilic filters will easily pass water or water-based solutions such as dairy, river water, seawater, cell culture solutions, buffers, beverages, and many more. The filters best suited to handle these solutions are silver, ceramic, glass fiber, cellulose acetate, mixed cellulose ester (nitrocellulose), nylon, polyester, polycarbonate (PVP-treated), polyacrylonitrile (PAN), and PVDF. They can be used for almost any application that needs particle removal, clarification, cell