Electro Coagulation for Waste Water 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.