Tying up Resins and Activated Carbon in Permeable Bags in Water Treatment

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What are the advantages and disadvantages of tying up powdery or crystalline resins and/or activated carbon in permeable bags before using to charging water treatment composite filter cylinders in drinking water treatment plant?

It is a common practice, by some professionals and others alike, to tie up powered or crystalline resins and activated carbon in permeable bags before charging them into the water treatment composite filter cylinders. Citing the advantages of not losing some into the pores of sand and gravel beds and narrowing the pores in such beds.

Has anyone done a research on this?

What happens to the "total surface areas" of the resins and activated carbon, active sites contacts and contact time, in this case?

Is the functional efficiency of resin or activated carbon reduced or improved?

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6 Answers

  2. Savings in the treatment materials is an essential part of the economy of water treatment systems. The use of permeable bags (usually textile or white cloth bag, in which a weighed amount of the adsorbent or the reactant, helped me to remove control the level of phosphate from water as struvite. We placed a known amount of MgO in the bags and hanged them in the container and kept stirring. The result is atarctive. We saved the MgO and the struvite yield was consequently found in the bags. 

  3. Justin

    This has been bread and butter research for the team at SLS.  

    Like all water treatment processes there are many variables and we could write a lengthy dissertation.   Likewise there are as many different reasons why a process plant might need to do this.

    Some of the more important variables after selection of the absorbent are type of bag, shape of bag, position and alignment within the tank.  If these parameters are sensibly addressed within the design engineers task then total surface area of the the resin or carbon is not overly compromised.  

    A competent designer of this type of application will understand the differences between adsorbing and absorbing media kinetics and thus how to design for best performance.  When the design does not apply good principles things, such as flow characteristics and solids overloading will compromise the process efficiency.

    Anyone requiring more information :  stewart@slswaterfilters.com.au

    Thanks

  4. The flow characteristics will be compromised. It makes no sense.

  5. Although both media are used for water treatment, there is a reason these processes are separated.  The activated carbon is typically used a protection treatment step to remove oxidants which are deleterious to the resin.  In addition, the microfine particles electrostatically clinging to the GAC could wash off and adhere to the resin.  Once coated with the fine AC, the resin is essentially useless or at least, significantly diminished in capability.  Best to separate the processes rather than pay a premium price for a mixture that will be moderately effective at best.

  6. Hello this stage it remains unclear. Water treatment? But what treatment? It's the same thing in wastewater, we speak of processing without defining the treatment: treatment of purification, purification,? Once the treatment is defined it must materialize this treatment: who what what what, how? This well presented simply to output samples and see the result.

    Coal captures water, brings t - it purification? It seret filter, ok. What stae's t) he saturate? by saturating it loses its effectiveness progressivbement, how to measure the level where it is more effective? On paper we do everything by doing nothing. 

    The resin and coal have specific properties. What reaction causes t - it facing components of water you want to treat? What are these components you want to get rid? If it were that simple, nature will not years to make drinking water