Unit-Ultrafiltration

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Ultrafiltration Plants

Lenntech can design, build and commission tailor-made and turnkey ultra filtration (UF) plants.

Our UF plants are built with hollow fiber outside-in or inside-out membranes capable of treating several flows of different sources and remove suspended solids, colloids and all kind of micro-organisms such as bacteria, viruses, protozoa, germs and larvae.

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Model referenceFlowLT-UF-FILT-52-5 m3/hLT-UF-FILT-105-10 m3/hLT-UF-FILT-2010-20 m3/hLT-UF-FILT-4020-40 m3/hLT-UF-FILT-6040-60 m3/hLT-UF-FILT-10060-100 m3/h

Please check Reference projects for more information on Lenntech built and running plants.

Ultrafiltration can be used as a very effective pretreatment step prior to Reverse Osmosis Plants .

Interested in renting a pilot unit? Please, check Lenntech UF pilot available for rent.

Ultrafiltration plant description.

General design data for Ultrafiltration Plants:

GroundwaterSeawaterSurface waterTurbidity< 5 NTU< 20 NTU< 50 NTUFlux75 lmh60 lmh45 lmhDaily recovery (24h)96%94%85%Membrane typesHollow fiber outside-in/inside-outMax TSS100 mg/LMax COD60 ppmMax oil and grease2 ppm

What is ultrafiltration?

Seawater desalination

Surface water treatment

Ultrafiltration membranes

For more information or quotation, please contact us: Feedback Form or call us on +31 152 610 900

Ultrafiltration

Membrane technology

Ultrafiltration is used for the separation of suspended solids, colloids, bacteria and virus. This technique uses membranes with pore size between 1-100nm.

TECHNIQUEMWCO* (Da)Microflitration>105Ultrafiltration103-105Nanofiltration102-104Reverse osmosis102

* MWCO = molecular weight cut-off

0,001 0,01 0,1

µm

OSMOSE INVERSE ULTRAFILTRATION

NANOFILTRATION MICROFILTRATION

There are 4 membranes geometries:

Spiral wound module: this design tries to maximize surface area in a minimum amount of space. It is the less expensive but more sensitive to pollution due to its manufacturing process. It consists of consecutive layers of large membrane and support material in an envelope type design rolled up around a perforated steel tube.

Plate and frame module: it is normally used for bad quality water. They are set up with a stack of membranes and support plates.

Tubular membrane: Generally used for viscous or bad quality fluids. These modules do not need a preliminary pre-treatment of the water. As the feed solution flows through the membrane core, the permeate passes through the membrane and is collected in the tubular housing.

The main drawback is that the system is not very compact and has a high cost per m2 installed and it is not very compact. Diameter’s tube is generally between 4 and 25mm.

Hollow fiber membrane: The modules contain several small (0.6 to 2 mm diameter) tubes or fibers. As the feed solution flows through the open cores of the fibers, the permeate is collected in the cartridge area surrounding the fibers. It can carry out the filtration in two ways, either “inside-out” or “outside-in”

Comparison between the different types of geometry (Source: Water Treatment Handbook, Degrémont Suez, 7th edition):

TubularHollow fiberPlate and frameSpiral woundReverse Osmosis, Nanofiltrationyesyesyes>95%Ultrafiltration, Microfiltrationyes>95%yesyesCleaning ease++++-+Pre-treatment need+++++-Recovery rate+++++++Module size-+++++Cost per m2-+++++++

-: disadvantage

+++: obvious advantage

There are two ultrafiltration module configurations:

Pressurized system or pressure-vessel configuration

Immersed system