UF and DMF

Started by AHMAD ALHARBI on
23 Apr 2015 at 11:20
Sr. Specialist, Water Planning , Power and Water Utility Company of Jubail and Yanbua
Know-how: Multi-Stage Flash Distillation

Dear All,

Can any one shade a light on the technical advantages of UF technology compared to DMF as well as the cost benefits.

Thank you for your help.

Industry Tags: 
  • WaterDesalination


Edward Blackmore
The main benefit of DMF over UF is that it is cheaper to install, replace and operate. We offer our Pumice Media for DMF pretreatment prior to UF as it gives the following filtrate quality when used with sand:

- Suspended Solids < 1 mg/l
- SDI < 2
- turbidity < 1 NTU

This is then more than sufficient for downstream UF. Let me knwo if you want further information.
Dear Mansoor & Matan,

Thank you helpful comments. I asked this because i am preparing a report about both systems to change an existing DMF with UF or rehabilitate the former for one of our SWRO.
Engr. Mansoor Ahmed PhD. Scholar
Dear Ahmad,

There matter of applications, some places DMF are move economical and beneficial then using UF.
Some application are of DMF is used as Pre-Filtration to UF.
DMF cheaper to replace than UF membranes
DMF having filtration efficiency up to 50 - 100 microns. Whereas UF having Filtration Efficiency up to 0.02 - 0.03 micron.
SDI most of the times unaffected by DMF whereas UF reduces SDI significantly.
Overall Cost of DMF is cheaper than UF if we compare DMF you only need to change Media whereas you need to change UF membrane as a whole.
DMF media life depends but normally Sand media up to 2 - 3 years whereas Activated Carbon Life 1 years max.
UF acquire/occupy lesser space then DMF

For me normally it is not appropriate to compare both as this is matter of application and normally you are very clear in the product water requirement so you choose which type of filtration is better/economical to apply.
Matan Beery
Main benefits of UF compared to DMF are:
-higher filtrate quality, typically guaranteeing SDI<3 or even SDI<2 regardless of the feed water quality and full removal of solids <10 micron
-less (or no) coagulants
-higher degree of process automation
-less footprint
-lower life cycle costs (when considering RO cleaning and replacement cost savings)
The main disadvantages are the higher capex and (usually) higher energy consumption. Additionally, the removal of organics by UF could be less efficient (biofouling!), if applied without coagulation.
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