Advantages and disadvantages of dosing sodium metabisulphite at RO Feed water?

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What are the advantages and disadvantages of dosing sodium metabisulphite (Na2S2O5) at RO Feed water?

Your experience much appreciated!

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4 Answers

  1. If it is a standard poly-amide membrane, SOME form of chlorine removal will be necessary.

    You can use bisulfite, activated carbon and UV.  The advantages of bisulfite are that it is the cheapest of the three options from a capital standpoint, and probably the cheapest long-term from an operating standpoint.

    As for disadvantages, make sure you get a stabilized product or it can break-down over time and lose its effectiveness.  Over-dosing can cause micro-problems.  You have to make sure your pump stays primed and operating, and that you are dosing at the correct level 

     

    P.S. - (Edit)  Sorry, I should have looked closer at your job.  In the beverage market, companies have traditionally used activated carbon somewhere in the water treatment process to ensure sufficient removal of organics that can cause taste and odor issues.  An RO will reject salts with greater efficiency than organics.  So, while an RO may reject enough organics to avoid issues, carbon has typically been seen as "insurance" against organics.  Shoot an email to this guy: michael.mcdonald@suez.com.  You can tell him I sent you his email.

  2. Sodium metabisulphite is a reducing agent. It is added to feed water to RO for removing oxidizing agents like Chlorine and Dissolved Oxygen. This is an essential step to protect membrane 

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  3. When dosing Sodium-Metabisulfite you will mostly eliminate chlorine. It is dosed as a disinfection chemical before RO or it is delivered by muni water source and will be destroid by Sodium-Metabisulfite. With usage of Sodium-Metabisulphite some disadvantage follow: 

    It act as a nutrient for microbiology and this forced agin  the application of chlorine and again .....

    Chemical free solution: 

    Destroy chlorine from muni with Atlantium‘s HOD-UV systems.

    If you dose chlorine - substiute it by Atlantium‘s HOD-UV disinfection technology.

    RO operating cycles will expand dramatical and flux rate will increase also energy consumption decreases.

    Atlantium.com

    jorge@atlantium.com