How to Increase Calcium ion in RO Water with High Capacity (1500 m3/d)

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How can I increase calcium ion (Increase from 1 ppm to 20 ppm) in RO water using natural things or water soluble calcium salt?

This is for a 1500 m3/d  capacity of RO plant.

The goal is to produce drinking water.

Thanks for your guidance.

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10 Answers

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  2. 1. Have to ask how a ~102 membrane SWRO system could get off the ground without any means to manage the permeate LSI unless the stated 1500 m3/d is incorrect.

    2. Calcium is not necessary to attain a potable water quality, it is necessary to manage corrosion  (although there are also other theories) or more specifically the LSI which ideally should be > -0.05 but typically difficult to achieve post a SWRO system with a lack of C02 in the permeate.

    3. Plausible means to increase the LSI have been mentioned such as chemical dosing or calcite filters however there are limitations with the former affecting the final pH (can hit >pH 10 easily and still have a corrosive LSI) and the latter needing large refillable tanks and C02 injection to effectively dissolve and yet it can still be corrosive (albeit not as bad). On top of this, the companies that sell these consumables do not typically provide system design to dispense, you have to design this yourself or engage a company to design.

    In all honesty Ahmadi this is out of your depth to manage as there is no quick fix by simply adding a consumable (especially on a potable water consumed by people) without an in-depth review of the process in full.

  3. If you are treating seawater there are techniques for recovering Ca and Mg from the brine and recycling back to the permeate.

    1 Comment

    1. Yes, we treatment the seawater.
      What are the techniques?
      please guide me.

      1 Comment reply

  6. In the Drinking water spec. there is no requirement to maintain 20ppm Ca. Only upper limiting values are given.

    To increase Ca, you can have either split stream option or pass the RO water(bypass degasser) through Dolomite bed.

    Full detail is required for a right suggestion.

     

    1 Comment

  7. Agreeing with the alternatives exposed by Cotruvo, Anderson and Meredith, it would be interesting to know the source quality.
    For instance let us assume a very hard (but exempt of toxic or other undesirable substances) source quality, say a 200 ppm Ca water feed. A 10% side stream of not RO treated water (the source water) remixed with the RO accept to give you the total flow will have the wanted content of Calcium.
    Advantage: you do not need to add any purchased material, and you reduced the load of the RO by 10%.

    1 Comment

  8. Agree with Mr. Cotruvo.  

    Suggest trickling it through a bed of dolomite in an atmosphere enriched with carbon dioxide.  This is the same process that would occur underground.  Dolomite has both calcium and magnesium.  Be sure to use dolomite certified to have low lead and other toxic metals.  Not tailings from some mine.

    The amount of carbon dioxide can be regulated to control the ppm.

    I make this water for myself on a small scale.  It makes terrific coffee.  

    Using soluble salts is not as healthy as using bicarbonate.  Chlorides are a bad choice because they are like adding salt to the diet.  They reduce the bodies ability to regulate pH by controlling carbon dioxide.

    If you add a few amount of potassium and sodium bicarbonate you can make a water as healthy and tasty as Evian.

    1 Comment

  9. I agree with Jospeh, adding a calcite filter at the appropriate flow rate will add the sufficient calcium level. However dosing maybe a more accurate method. I can give you the relevant supplier contacts if needed. 

    2 Comments

  10. Add lime or filter through calcite at the appropriate rate to achieve 20 ppm..

    Are you doing it to reconstitute for health reasons? If so you should be adding magnesium at about 10-15 mg/L.

    3 Comments

    1. Mg if maintained near 30 ppm is considered good