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  1. longbow75

    Start-up Poiseuille Flow

    Hi, I'm trying to solve start-up flow in a hollow cylinder with matlab and finite difference method. I'm still new in matlab and I have this code: clear;clc; h = 1; Dr = 0.01; Dt = 0.01; nmax = 4000; epsilon = 0.0001; r = [0:Dr:h]; t = [0:Dt:h]; beta=0.1; n1 = fix(h/Dr)+1; m1 =...
  2. longbow75

    Desal Pilot Plant

    Hi, We have a desal pilot plant in place. It has a UF train and a RO train. We're having trouble preparing a well defined test plan. Neither me nor my boss has a lot piloting experience. Can you recommend me a good source of information, preferably a book, regarding preparing this test plan...
  3. longbow75

    High pH

    Thanks guys!!! I believe I'll look into trying to expediate the process since we can't add acid (no permit) and don't have waste tanks.
  4. longbow75

    High pH

    This is what I got... " Thanks for your phone call regarding the Pureflow Filtration system located at the ....... well water treatment facility. In reference to the pH increasing from 7.0 (raw water) to 10.0 (filtered water), I offer the following information: a. The pH increase is...
  5. longbow75

    High pH

    Thanks for the replies. I was able to contact pureflow and they confirmed pH raise and told that it'd take 2-4 weeks to stabilize. 1 ppm NaOCl would increase pH to only about 9 even if there was no Fe and Mg present. That's an interesting result though that there is some type of media reaction...
  6. longbow75

    High pH

    We have a filter plant which has three 300 gpm pureflow filter vessels and trying to treat groundwater which has Fe Mg and As. Our influent pH is 7 however effluent pH is 10. The only chemical we add to the influent is NaOCl.Initially I thought it is because of the filter media. It is brand new...
  7. longbow75

    Chlorinated Water and RO Membranes

    I agree with kenvlach. No exact answer. However a phenomenon known as chemical attack occurs in presence of Cl and a transitional metal such as Fe. It's best to dechlorinate your flow right befoe RO. P.S. Even if you have a feed Cl concentration less than manifacturer's limit, depending on...

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