Electrocoagulation

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by Tompal33
Last updated 5 years ago

Discipline:
Science
Subject:
Cycles & Processes

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Electrocoagulation

Parallel electrodes are used to introduce electrical currents into the water and are made from a variety of different metals. Aluminum and Iron are the most common electrode materials. The metal ions will become divided or become dispersed within the liquid medium, referenced by Faraday’s Law. As a result, a nucleus will from and that the contaminants will be attracted into a precipitate which can be removed later in the treatment process. .....................................................................................................................................................................................................

Electrocoagualtion

What is Electrocoagulation?The process of electrocoagulation is based on the premise of destabilizing suspended or dissolved solids in wastewater with the use of electric currents. Chemical reactions are stimulated by the electromotive force which is produced by the electrical currents. Reactions generally reach a very stable point when they are forced and usually result in a solid that is less soluble and colloidal than elements or compounds at similar equilibrium values.

Equipment

Why Use It?

How Does It Work

Electrocoagulation utilizes electricity to assist in initiating chemical reactions and it has many environmental benefits because it helps to limit the use of dangerous, expensive and even toxic chemical which have been traditionally used to do the same thing. Less Waste, and less chemicals entering the water.

Environmental Impact

WasteWater Treatment Plants Using Electrcoagualtion

Wastewater Plant at Canadian Armed Forces Base Esquimalt, Victoria, BCVancouver ShipYardsWastewater Treatment Plant, North Vancouver, BCAeivatsWastewater Treatment Plant Brantford, Ontario"Electrocoagulation." McKay Creek Technologies Ltd. N.p., n.d. Web. 27 Nov. 2014

Chemical coagulation has been the traditional method to disinfect the water but there are many benefits to switching to electrocoagulation. When compared to chemical coagulation, electrocoagulation produces less sludge because the process doesn’t require the addition of chemical coagulants such as polymers, lime and alum. It is difficult to filter and dewater chemically coagulated water because the of the high bound water content. Reuse of the water in the industry is also limited when it comes to chemical coagulation because of the high content of total dissolved solids in the effluent. Electrocoagulation limits the use of expensive and harmful chemical agents such as polymers and metal salts due to the fact that it can neutralize particle and ion charges which allows the contaminants to precipitate. The floc that is generated by electrocoagulation differs drastically when compared to the floc from chemical coagulation because it is more shear resistant, contains less bound water and can be readily filtered..

ContaminantsPercentage RemovedBOD90%+TSS (Clay, coal, silt, silica, etc.)99%+Fats, Oils, Grease93-99%+Water From Sludge50-80%+Heavy Metals95-99%+Phosphates93%+Total Coliform (E. Coli)99.99%+


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