Our SiC Membrane Technology - Filtration
On the basis of revolutionary silicon carbide (SiC) technology, LiqTech develops, manufactures and globally markets ceramic membranes for filtration of liquids. The membrane substrates as well as the coatings are made from 100% silicon carbide. This gives our membranes some unique advantages compared to traditional ceramic and polymeric membranes.
The ceramic membrane carrier is based on the so-called honeycomb or monolith structure as shown below:
A number of parallel flow channels extend through the element in the porous support structure. The feed stream is introduced under pressure at one end of the element and flows through the channels during processing. The portion of the liquid passing through the membrane, the permeate, flows into the porous structure of the element. The combined volume of permeate from all flow channels flow toward the outer shell of the monolith support and is removed continuously.
The actual ceramic membranes are formed on the walls of the flow channels extending through the porous ceramic structure of the element by slip casting a specific coating of ceramic particles according to the desired pore size and distribution. The coating material, containing the silicon carbide, is dried and sintered. This process ensures a strong bond with the carrier material and provides the membrane with its unique ruggedness and durability. Several layers may be deposited on top of each other in order to reach the desired combination of membrane pore sizes and water flux.
SiC membrane layers on top of a SiC carrier
Features & Benefits
Highest flux for any membrane material
The high flux is reached through high membrane porosity (~45%) and a material with low resistance to transport of water and a low contact angle. Reduce your foot print and system costs (less pipes, valves etc.)
Chemically inert pH 0-14
No limitations, fast cleaning, reduced down time during Cleaning in Place (CIP), filtration of acids and alkalis.
Thermally resistant up to 800 ˚C
Steam cleaning, more efficient chemical cleaning, and high temperature applications.
Hydrophilic material (water loving)
Unmatched performance in oil/water separation.
Isoelectric point pH 2.4
Unmatched performance in oil/water separation – To some extent reduces fouling, easier to clean.
Extremely hard and durable material 2930 +/- 80 kg/mm³ (Vickers scale)
Robust and long life time, less down time and maintenance, stable operation, cleaning with shock pulses, and hard material.
Corporate Benefits of LiqTech SiC Membranes
1. HIGHEST FLUX – FOR ANY MEMBRANE MATERIAL
Our very high flux capabilities are reached through the very porous material composition which is only achievable with silicon carbide raw materials. Our extruding process and very accurate burning process secures high quality membranes with even permeability across the entire membrane surface area.
2. LOW OPERATION COST
At LiqTech we have great focus on our customers operating costs. Seen over time, you will save money investing in a LiqTech water treatment system compared to a traditional system.
The initial investment might be higher but the savings on membrane replacement, water, energy and chemicals will give you a low Life Cycle Cost. With a silicon carbide membrane system you get a membrane that will last you a life time*.
*If maintained and cleaned according to our specifications.
3. COMPACT SYSTEM
Smaller is better… Why install a traditional old fashioned sand filter which is bulky, difficult to clean and uses lots of water for cleaning?
That is the question we had in mind when we developed the LiqTech membrane system. With our compact silicon carbide membranes, our footprint is reduced by 1/4th of that compared to traditional sand filters. In addition, you use less water for cleaning, simply because the actual volume of water inside the filter is greatly reduced.
4. REMOTE CONTROL
A LiqTech system allows management and data recording via the internet, and gives you complete control of your water treatment system. Our remote management system lets you monitor and manage your water treatment system via an online connection and provides remote access to data and alarms.
Features and benefits:
- Complete status overview of the entire system
- Live monitoring, analysis and adjustments from the comfort of your office
- Follow trends and reports on transmembrane pressure, flow and many other parameters
- Plan service and maintenance based on actual operating data
- Share system documentation online with all relevant personnel
LiqTech produces an extensive range of sizes and configurations of SiC membranes. Below is an overview of our membrane products and filtration principles.
CROSS-FLOW AND DEAD END FILTRATION (INSIDE-OUT)
Our range of CoMem and CoMem Conduit elements are designed for cross flow filtration for filtration of liquids with high amounts of suspended solids, oil, algae, bacteria etc.
Cross flow filtration is a filtration method where the feed flow is tangential to the surface of the membrane in order to sweep rejected particles and solutes away (see figure 3 below). The feed fluid is separated into two product streams, the permeate, which is depleted of the rejected particles, and the retentate (or waste/concentrate), which is enriched in those particles.
The great advantage of using cross flow filtration is the superior handling of liquids with high solids content, as the retained particles are being continuous removed from the membrane surface. In addition to the cleaning mechanism of cross flow filtration, the tubular membranes can be cleaned with the means of a traditional backwash, back pulse and/or periodic chemical cleaning.
CROSS FLOW FILTRATION PRINCIPLE
Flat Sheet Membranes (FSM)
SUBMERGED MODULES FOR VACUUM DRIVEN FILTRATION (OUTSIDE-IN)
Our range of FSM are offered as individual sheets or as ready to implement filtration modules which consists of multiple membranes built into a robust resin. The FSM are used in submerged vacuum driven filtration systems which are based on several stacks of modules built into filtration racks. The filtration mode is outside-in and cleaning is performed by a combination of airscouring, CEB (Chemical Enhanced Backwash) along with periodic chemical cleaning.
Flat sheet membrane principle
Not two applications are the same…
Therefore we make customized systems which are tailored exactly to your application. Our in-house capabilities in design, engineering, fabrication, programming, installation and commissioning make our turnkey systems unique and ensure the best efficiency.