Desalination

NOM REMOVAL IN SEAWATER PRETREATMENT

ali salmani
619 Views
Started by ali salmani on
10 Sep 2014 at 14:16
Process Expert, Absun Zolal
Know-how: Ultrafiltration, RO Systems, Oil Water Separation, Ion Exchange, Drinking Water Treatment, Carbon Filtering
Technology

Dear members,

What's the best method for NOM (Natural Organic Matter) removal in seawater desalination (by RO) pretreatment?

Best Regards,

Salmani

Industry Tags: 
  • WaterDesalinationReverse Osmosis

Comments

Matan Beery
With coagulation-flocculation-DAF-UF you could reach 50-60% NOM removal from seawater. For higher removal rates you will need active carbon and/or nanofiltration.
Engr. Mansoor Ahmed PhD. Scholar
Dear Ali,

Common practices depends upon the concentration or load of Colloidal and NOM in the Seawater. Anyway following are some economical and available options to be considered step wise as the extent and complexity of the pre-treatment systems for removing or reducing colloidal and organic fouling depends on site conditions. In case of open seawater intake, reverse osmosis membranes should be protected against a variety of foulants, necessitating an extensive pre-treatment process otherwise in case of Seawater coming from Bore Well will definitely have less exetensive pre-treatment process;

Low Level NOM Concentration
Pre-Chlorination (This can either be done prior to Multimedia or Post Multimedia-------->Single Stage/Double Stage Multimedia Filters --------->Activated Carbon Filters (In some cases if required)..........

High Level NOM Concentration

Coagulation/Flocculation--------->Sedimentation or Floatation------->Single Stage/Double Stage Multimedia Filters --------->Pre-Chlorination (This can either be done prior to Multimedia or Post Multimedia------->Activated Carbon Filters (In some cases if required)..........

When the above is completed, then it goes to UF or NF and then RO.

Hope this addressed your query properly.
ali salmani
Thank you for your thorough answer.
emilio munoz
you can try a combination of different technologies for example (safety strainer + Dissolved air flotation + automatic self-cleaning filters at 5/10 micron... if you want a high advanced pretreatment you can use a Ultrafiltration upstream the RO plant.
ali salmani
It should be noted that UF alone can not have a good effect on NOM removal. See the below link:

http://www.ncbi.nlm.nih.gov/pubmed/20698267
lyseconcept jean Marius
la matière organique dans la mer provient de l'érosion de la partie terre, un processus naturel permanent. Dans la mer elle a son utilitée. Sortie de son contexte elle va se transformer en boue, un résidus non recyclable car non assimilable par la nature. le processus de déssalinisation aura des effets dévastateurs:
sur l'écosystème qui vit grâce à cette matière organique
si la boue est déversée en mer , c'est une catastrophe écologique
le déssalement va générer plus d'eau potable consommée qui elle a son tour va produire plus d'eaux usées qui elles à leur tour serotn rejetées dans la mer augmentant la pollution et donc détruire l'éco système encore plus.
C'est un processus à contre sens du naturel il est donc non productif, une vision à court terme

The organic matter in the sea comes from the erosion of the ground, a permanent natural process. In the sea it has its utility. Taken out of its context it will be transformed into mud, residues nonwhich can be recycled because nonassimilable by nature. the process of dessalinisation will have devastating effects:
on the ecosystem which lives thanks to this organic matter
if mud is poured at sea, it is an ecological catastrophe
desalination will generate more consumed drinking water which it has its turn will produce more waste waters which they in their turn serotn rejected into the sea increasing pollution and thus to destroy the éco system even more.
It is a process with against direction of the naturalness it is thus nonproductive, a short-term vision
emilio munoz
depends on the concentration of this NOM, you can choose among different technologies...
ali salmani
Dear Sir
What's your offers for (1) low level and (2) high levels of NOM?
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