Electrodeionization (EDI) Leaking ( water dropping between stack frame and gasket )

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Hello, Hopefully you are fine and doing well.

I want to place my question in front of you , My EDI leaking from Gasket and Frame, Initially water dropping drop wise now is water leaking high amount.

However, very high amount leakage of water found in the front side and back side both corners drop wise.

Furthermore, Resistivity decreases i.e below 16.9 , while Iron and Silica slip into the feed water which is normally in range around 10 ppb.

I want to know expert opinion about why this happen

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4 Answers

  1. it depends on which make and what is the operating pressure and differential pressure and what torque has been set. Some modules are designed for 7 bar maximum operating pressure and does not leak. Some plate and frame modules comes with double O ring seals and hence chances of leakage is less.



    Raman

  2. Regarding leaking, there are often 2 causes. First is how the EDI is mounted to the skid, and second is if the torque was set properly. SnowPure's EDI modules come with startup instructions (English) that should help with this. Contact info (at) snowpure.com directly for more information.

     

    Regarding product quality, it depends on the influent water quality and operating conditions (environmental and DC voltage, current, quality). Influent water variables include conductivity, CO2 and HCO3, pH, and impurities like Fe and TOC that foul the resins. SnowPure or the system supplier should be able to help if you have an RO permeate analysis.

     

    Michael J Snow, Ph.D., President SnowPure Water Technologies (USA)

    1 Comment

    1. since commissing we have facing T. Iron between 20 to 40 ppb EDI feed, EDI Current 2.5 to 2.6 , voltage 103 to 132. Cunductivity of feed water 6 microS/cm , PH 5.50 - 6.50 , Co2 in RO feed water ( bore well ) 6.16 , TOC and HCO3 quantity  i will share after analysis 

       

  3. It does depend on what brand CEDI you have, however the next question is this:

    Did you carefully follow the OEM requirements during installation?  Did you check and correct end plate bolt torque settings after moving the stacks into position?  If not, any leaking will not likely be fixable at this point due to infiltration of resin into the compartment spacer interstitial seals.

    If you have a loose hose adapter or pipe adapter on the stack, it could make the leak appear to be coming from the frame.  Check carefully the source of the leak again, and tighten any loose adapters.  This has nothing to do with upset in feed water quality.

    1 Comment

  4. first, what brand of EDI do you have? If you have the plate and frame type then leak is a perennial problem for that type of EDi. it is caused by the inherent design problem of that type of EDI. that is the reason why years later, other configurations were developed. another reason is system pressure, if the flow of water is blocked and it cannot escape then the pressure build up will cause the weakest component of the system to leak, in this case the gaskets and the frame.

    1 Comment