Removing cyanide's from concentrated industrial waste water

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  I ask for advise to remove 2 ppm cyanides from concentrate waste water ,containning:18% TS(mineral salts),  30 ,000 ppm TOC-(detergents)

Thanks

Shar

 

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12 Answers

  2. AVS electromagnetic vortex layer units are highly efficient in the decontamination of the industrial waste streams from heavy metals ions and other toxic substances such as chrome, zinc, nickel, cadmium, mercury, cyanide, arsenic, fluorides . More info on:    avs.globecore.com

  3. Dear Sir

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  5. What daily volume of wastewater are we discussing? 
    We are talking about only 2 ppm of cyanides in a concentrated wastewater... if they were really a problem, you could use a little sodium hypochlorite to neutralise those traces of cyanides.
    The alternatives of ozone or hydrogen peroxide seem to me to be more complicated in this case, as well as the possible galvanic oxidation.

    1 Comment

    1. All the hipochlorit  and hydrogen peroxid are    demanded to oxidize the organics detergents. 

  6. Thanks to the hyper oxidation plasma, the oxidant substance OH- O2 -O3- H2O2 and high UV light; The organic material in water will burn to CO2 and all detergent waste and cyanide waste will be broken down and destroyed.Organic P organic N No need for biological treatment that will go down below 0.1 ppm, it becomes TDS TSS in the water and is separated from the water. It is possible to precipitate these residues, including heavy metals, by using catalysts in coagulation.

    1 Comment

    1. Thanks for the comment on the variety of oxidant sources that may be used to destroy the week CN bond, along with the comments about Organic P and N.  I had a case for metal cleaning where a chelated CN was present: it took me months to realize that the problem was not CN but the chelated materials present.  I also found the strange case that I was getting some interference the field methods use to determine the amount of CN present to allow discharge.  As always, sometimes we have to dig a little deeper into the literature to find the real problem.   

      1 Comment reply

      1.  you are so write.I certainly sure that the concentrae waste contains thiocyanats that are determine as cyanide,but very dificult to approve it    

  8. Chlorine is often used, and yes the pH must be elevated to keep it in solution.  However a stronger oxidizer is often needed, and hydrogen peroxide is a stronger oxidizer with none of the toxic products that may be produced with chlorine in several forms.  That being said  chelated cyanides present a slightly different problem because they may be more stable.   When you mention detergents, you are probably having a problem with chelated cyanides and may move to a stronger oxidizer, and a longer time for cyanide removal.  The CN bond is easy to break when alone and simple.  This sounds like something more complex, otherwise you could remove the cyanide with simple aeration  with exposure to UV light from the sun.

     

    To comment further, yes cyanide is biodegradable with the addition of certain strains.  I have done it with combinations of added air with bacillus and pseudomonas strains (they both need air) grown for this specific purpose.  But, again the time of reaction is slowed by chelants such as EDTA.   Time can be achieved  with larger holding tanks.  Adding air injections should help the process.   You may need all of the above suggestions to get the job done with that much detergents.  Also look at methods to remove the detergents first.   By the way, chlorine is probably being stripped out, of the process - as it often is. 

  9. Most important be always  alkaline > pH 8, NaOCl is a solution. May you blow out the tenses (detergents)

  11. La eliminacion del Cianuro se debe realizar en dos pasos.

    *Primero se debe oxidar al ion CN- con con NaCLO en medio basico dando formacion al ion CNO-.

    *En el segundo paso, el ion CNO- se trata con CLO- o CL2(g) para producir el ion HCO3- + N2(g).

     

    Buena suerte!

    Ing. Marcelo Donozo