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Electro Coagulation for Waste Water Treatment

Updated on August 12, 2011

EC Treatment

Suspended Solids Removal

Electrochemical precipitation is most commonly referred to as Electrocoagulation, which is a method of applying direct current to sacrificial electrodes that are submerged in an aqueous solution. When the proper voltage is applied, charged ions are released from the electrodes, which neutralize the charge of the contaminant and force them to precipitate. Hydroxyls are created as water molecules split through electrolysis, which causes contaminants to oxidize and hydroxides to be created. The majority of hydroxides come from the metal ions being released from the sacrificial electrodes in the form of either aluminum hydroxide or iron hydroxide, depending on what type of electrode material is being used. The metal hydroxides cause the precipitates to agglomerate and form a solid mass that will then separate from the liquid either through sedimentation or basic filtration. In essence, Electrocoagulation generates it's own chemicals that are proven to be much more effective than traditional chemicals.

The following removal results have been compiled from various field trials performed using Electrocoagulation. The removal percentages below represent average results of various contaminants from a wide range of industrial wastewaters.

Contaminant Typical % Removal

Aluminum 99 COD 50 to 99 Nickel 98+ Arsenic 98

Nitrate as N 50 to 90 Barium 94+ Oil & Grease 99+ Bacteria 99+

Phosphates 75 to 99 BOD 30 to 99 Silicon 75 to 99 Chromium 99

Strontium 50 Color - Dye 98+ Silver 99 COD 50 to 99

Tin 95 Copper 99+ TKN 38 to 98 Cyanide 95+

TOC 98+ Iron 99+ TSS 95+ Lead 98+

Vanadium 98+ Magnesium 98+ Zinc 99+ Manganese 95

What It Won't Treat

While Electrocoagulation is effective for treating a variety of contaminants, there are certain contaminants that cannot be treated with this process. Dissolved organics are not effectively removed using this process. Contaminants such as Glycol, Sodium Salts, Sugar and Alcohol cannot be removed. Boron, ammonia, and mercury are typically removed to only 60%.

Quality Systems offers aqueous parts cleaning systems. We also offer waste water treatments.

Please visit our website.


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    • QualityS profile image

      QualityS 4 years ago from Prairie Village Kansas

      I work with OILTRAP. They are very knowledgeable and honest. They worked very hard on a difficult dial in. They have a neat compact package. Call me with any questions 913362-6131

      Gary Showalter

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      Water Man Stan 4 years ago

      Hey how are you doing? I have been doing some research on ELectrocoagulation and Electrocoagulation technology. I am interested in in the solutions systems but I cant decide who is best. Do any of you know about

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      Greenwealth 6 years ago

      w provide small EC to help companies decide to install larger plants like those made by Quality Systems. The small test plants treats 10M3 per hr and cost only USD90,000

    • profile image

      Plymouth Technology Inc 6 years ago

      Plymouth Technology can help with Zinc removal.


      Plymouth Technology has a long history serving the zinc phosphating industry for the treatment of rinsewaters and concentrated solutions associated with zinc phosphating. Plymouth Technology offers proprietary products and services to treat chelated nickel and zinc-contaminated wastewater, promotes advanced treatment technology to maximize system efficiency, and delivers tremendous expertise for this industry's specific treatment challenges.

    • mrali2010 profile image

      mrali2010 7 years ago

      very nice work i am working on electrocoagulation in my research to get the master degree


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      Aldo Carlyle 7 years ago

      Will the use of Ozone pre-coagulation aid in the removal of dissolved organics?

      What about having two electro-coagulation stages with an ozone intermediate stage?

    • QualityS profile image

      QualityS 7 years ago from Prairie Village Kansas

      This is what happens in ozone which is a good way to disinfect. It will not pull the solids out as effectly.

    • someonewhoknows profile image

      someonewhoknows 7 years ago from south and west of canada,north of ohio

      why not use non magnetic stainless steel electrodes to split water into hydrogen and oxygen and use the oxygen to oxidize cantaminented water and seperate and use the hydrogen gas for another useful purpose?