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Recent content by Jeffrop

  1. Jeffrop

    Precipitate the heavy metal from EDTA complex ???

    Dear Kenvlach, I will check Ca+2, Mg+2, in our waste, repead the experience as you did and will let you know. Regards
  2. Jeffrop

    Precipitate the heavy metal from EDTA complex ???

    Dear Steve Could you give me the telephone number and/or email address of your company, We will get in touch with you. Thanks
  3. Jeffrop

    Precipitate the heavy metal from EDTA complex ??

    Dear bimr Here is the answer your question: 1- Lime was using to raise the pH. 2- Yes all samples were filtered before go to an other stage. 3- Polymer cationic was using, this polymer done good result with waste sample no EDTA. 4- No, calcium chloride was not using in our test. 5- Not yet...
  4. Jeffrop

    Precipitate the heavy metal from EDTA complex ??

    Dear Kenvlack, Bimr and ChrisDerrick The EDTA waste treatability test was done with two stages precipitations, here is the result, 1- Reference test: One organic waste water sample (no EDTA) was treated by hydroxide precipitation at pH 9.6, using cationic polymer . * The heavy metals before...
  5. Jeffrop

    How to remove the Ferro oxide (Fe2O3) deposit inside the piping ??

    Gentlemen, Thanks for your help, I will try its and let you know the result ! Have a good day !
  6. Jeffrop

    How to remove the Ferro oxide (Fe2O3) deposit inside the piping ??

    Hi everyone, The piping of our heat exchanger in 316 SS (1") was blocking by the deposit of Fe2O3 (solid) inside the pipe. Does any expert can suggest me a product to remove by dissolve the Ferro oxide (Fe2O3) and clean up the heat exchanger. Thanks
  7. Jeffrop

    Solubility of Ferro oxide (Fe2O3) in water Vs the pH

    Thanks kenvlach ! Jeffrop
  8. Jeffrop

    Precipitate the heavy metal from EDTA complex ??

    Hi Bimr Tks for your recommandation ! Jeffrop
  9. Jeffrop

    Solubility of Ferro oxide (Fe2O3) in water Vs the pH

    Hi every body It's will very appreciate if somme one can tell me the solubility of Ferro oxide (Fe2O3) in water acid to basic (pH from 1 to 14) Many thanks
  10. Jeffrop

    Precipitate the heavy metal from EDTA complex ??

    Dear Kenvlack, Bimr and ChrisDerrick, Thanks you for your interesting our subject and your suggestions ! Yes, we try with sulfide (Na2S) but did not work (sulfide only, not combine hydroxide/sulfide), after precipitation and sludge separation, we still have Ni in water ! We also try using...
  11. Jeffrop

    Precipitate the heavy metal from EDTA complex ??

    Hi ChrisDerrick, Thanks for your feedback, the EDTA-Ni complexe waste generating by the plating line. The concentration of other metal (Fe, Cr, Zn ..) is low (less than 10 ppm). We already try with suffite but did not work, Ni is still presente after precipitation. We will try with Sodium...
  12. Jeffrop

    Precipitate the heavy metal from EDTA complex ???

    Dear bimr, Thanks you for the information, we will look it carefully ! Regards ! Jeff
  13. Jeffrop

    Precipitate the heavy metal from EDTA complex ???

    Hi bimr, Thanks for your suggestion ! Could you pls sent me more information about the preciptation of Sulfide with heavy metal complex with EDTA and Sulfex process. Regards Jeff
  14. Jeffrop

    Precipitate the heavy metal from EDTA complex

    We want to precipitate the nickel ion from complex EDTA-nickel by hydroxide (OH from lime) but did not work ! The EDTA-Ni is so stable, Ni ion can not form a complex with OH to be precipitate ! !. We try to break down the EDTA-Ni complex before precipitate by oxidation (HNO3/H2O2...
  15. Jeffrop

    Precipitate the heavy metal from EDTA complex ??

    We want to precipitate the nickel ion from complex EDTA-nickel by hydroxide (OH from lime) but did not work ! The EDTA-Ni is so stable, Ni ion can not form a complex with OH to be precipitate ! !. We try to break down the EDTA-Ni complex before precipitate by oxidation (HNO3/H2O2...
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