Suitable electrolyte for electrocoagulation treatment of wastewater?

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Dear friends,

We are trying to use electrocoagulation method for treating waste water generated from paper industry. Can someone please suggest which electrolyte will best suit in electrocoagulation treatment of paper industry wastewater? The electrolyte should be helpful in the adjustment of conductivity of a solution and enhance the reduction of pollutants.

Preferably electrolyte should be environment-friendly!

Regards.

 

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6 Answers

  1. Hello dear friend. In Brazil we are using some natural floculants, such those mande by tannin. Take a look in https://mycourses.aalto.fi/pluginfile.php/151917/mod_folder/content/0/A%20review%20on%20application%20of%20flocculants%20in%20wastewater%20treatment.pdf?forcedownload=1. Best regards! Léo.

  2. Hi Junta Hans, 

    If properly designed the electrocoagulation system does not require electrolyte to treat paper making wastewater, more importantly it is the selection of electrodes and manner of operation.

    Such device has been successfully used in certain industries, e.g. coal washing wastewater. You may leave me an email so that I can share some information with you. Wastewater itself is a good electrolyte in most of the cases.

    Regards,

    Steve

  3. More information about the wastewater been treated need to be provided. A good review paper on EC is reported in “Environ Sci Pollut Res (2014) 21:2397–2413”. However, in Electrocoagulation, the most important is the pH that in order to help coagulating the iron and aluminum ions. Some research reported that the pH adjustment at 7, however, higher is preferable. A good paper for paper industry can be found in “doi:10.1016/j.jhazmat.2008.07.115; Journal of Hazardous Materials 163 (2009) 995–1000”. For electrolyte, depend on your electrode type, aluminium sulfate and NaCl is the most commonly used, but attention has to be taken (when NaCl is used) that electrooxidation not to occur. Thus toxic chlorinated compounds may form; see also; DOI: 10.1002/jctb.642; Journal of Chemical Technology and Biotechnology 2002, 77(7), 756–760. Hope this help

  4. Dear Junta Hans, "Electrochemical techniques are among the most widely used current applications in environmental protection and waste treatment. And their potential is even brighter. Broadly defined, electrochemistry is the study of those chemical and physical events that result in the flow of electrons (electricity), essentially through oxidation and reduction reactions. Although there is a tremendous interest in using electrochemistry to develop new and greener ways of manufacturing and using chemical products, a far broader need is to address the waste and pollution already produced (and continuing to be produced) by the non-green process of the past and present. The charged ions react with soluble and insoluble pollutants in the wastewater forming a floc that slowly increases in size by contact with ions of the opposite charge. The electrochemical reactions precipitate pollutants that are in a soluble state, e.g. chemical residues, and these precipitated salts form a floc. In a quiescent state the floc will generally settle to the base of a treatment tank and requires removal together with liquid, and then the sludge de-watered in another step. In a state where the liquid is flowing the floc is less defined and more difficult to separate from the liquid. Electrocoagulation (EC), aka radio frequency diathermy or short wave electrolysis, is a technique used for wash water treatment, wastewater treatment, industrial processed water, and medical treatment. Advanced biological treatment provides a far more sustainable alternative for treating paper industry wastewater as opposed to increasing its salinity (by adding NaCl) for electrocoagulation (EC) consuming a lot of electrical energy and producing a lot of EC-sludge. If you use NaCl, KCl as an electrolyte, oxidation of chloride ions on anode will lead to formation of oxidative chlorine species that can help in oxidation of dissolved organic matter in addition to coagulation by metal hydroxide species. Regards, Prem Baboo

    1 Comment

  5. U must use colloidal for that natural or chemical, h've look to Woiki for that

  6. it would depend on the parameters of your water things like your PH and the particles you can try your aluminium sulfate there are a number of products in the market there is no exact one the only way is to do a jah test to determine which one would work best i hope this helps you...........

    1 Comment

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