Ultrafiltration or membrane filtration is a water filtration technology based on membranes and pressure to separate particles in suspension and colloidal matter from water.
Nominal diameter of micropores in ultrafiltration membranes is around 0.03 μm, what provides a good balance between filtration and permeability and provides a barrier against bacteria and most virus.
Current quality standards for water supplies in drinking and industrial applications have increased the use of ultrafiltration (membrane filtration), which delivers higher filtrate quality than conventional sand, gravel and anthracite pressure filters.
Ultrafiltration is also widely used as a in integrated membrane filters as pretreatment to reverse osmosis plants, reducing the RO membrane fouling risk and before water disinfection. By physically removing bacteria and pathogens ,ultrafiltration can also reduce significantly the downstream Chlorine dosing.
The main benefits of ultrafiltration opposed to other conventional filtration technologies are:
The recovery rate of a typical Ultrafiltration (membrane filtration) system is the permeate volume divided by the feedwater volume for a period of time.
Permeate water used for backwashing and flushing must be considered for the overall system recovery. Typical recoveries for ultrafiltration systems range from 85 percent to greater than 95 percent.
Design recovery typically decreases as feedwater turbidity increases and, in some cases, recovery and plant capacity are constantly monitored and controlled to match the feedwater quality.
1% to 15 % of the daily filtrate flow will typically be required for backwash and membrane flushing in any industrial ultrafiltration (membrane filtration) plant.
|Standard Technical Data *(1)||UF-5||UF-10||UF-20||UF-30||UF-40||UF-50||UF-80||UF-100|
Filtrate flow (m3/h)
2 bar (min) – 4 bar (max)
< 0.1 NTU
|UF Membrane Type||Energy-Saving Hydrophilic PVDF-fiber membranes|
Number of UF Membranes
50Hz, 230V (1-Phase) or 400V (3-Phases)
50Hz, 400V (3-Phases)
|Features & Options||Standard||Option|
100 μm cartridge pre-filters
Self-cleaning disk pre-filters
Outside-In flow configuration
Air scour cleaning
Chemical backwash cleaning (chlorine/acid/base)
VFD for feed pump
|Backwash sequence initiated on time||Standard|
|Backwash sequence initiated on diff pressure or filtered volume||Optional|
Energy-Saving Hydrophilic PVDF-fiber membranes
|Qualified Feed Water Quality||Units||Recommended||Limit|
|TSS (Total Suspended Solids)||mg/L|
|TOC (Total Organic Carbon)||mg/L|
|COD (Chemical Oxygen Demand)||mg/L|
|Oil and grease||mg/L|
6 – 9
|2 – 11|
REVERSE OSMOSIS DESALINATION
IRON AND MANGANESE FILTERS
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