Electrocoagulation Essay

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ABSTRACT

The dyes & dye intermediate industry consumes large quantity of water & produce large volume of wastewater from different generated steps in dyeing process. The effluents generated are heavily coloured & contain high COD/BOD value. The effluent causes depletion of dissolved oxygen which has an adverse effect on the aquatic ecological system. There are certain physio-chemical, biological & advanced wastewater treatment technologies which are helpful in wastewater treatment of dye industry such as ion-exchange, adsorption, coagulation, R.O, chemical precipitation & electrocoagulation. Since electrocoagulation is very effective in removing dyes from large volumes of effluents & low in cost so it is mostly used. The main advantage of …show more content…

It also decreases the amount of sludge, which needs to be disposed. Electrocoagulation is a technology that removes components from wastewater by applying a strong electric field that produces a series of oxidation and reduction reactions. By decomposing the electrodes, the metallic ions produced are subject to fast hydrolysis and the products of the hydrolysis neutralize the charge of the suspended particles driving them to a fast coagulation and sedimentation. Electrodes consist of iron and aluminium have special coagulation properties and are very efficient in decolouring industrial wastewater. In recent years, the EC has been successfully tested to decolourization of dye-containing solutions. Applied electrodes in EC process are usually iron or aluminium. The dye in coloured wastewater is coagulated by iron and aluminium hydrates or hydroxides produced from the sacrificial anode. EC technology, compared with other techniques, enjoys some advantages like plain equipment, easy functionality, short resistance time, no need of chemicals, low sludge production, sludge stability, suitable sedimentation of sludge, dewatering and environmental compatibility. EC process is being used for the removal of ions, organic matters, colloidal and suspended particles, dyes, oil and heavy metals from aqueous

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