Abstract
This review includes many studies of Electrocoagulation (EC) process in dairy wastewater (DWW) treatment and make comparison among these experimental results in absolute terms of chemical oxygen demand (COD) removal. To do that unit COD removal indicator (CODi-t) is calculated. Recently, EC technique gained immense attention due to its efficiency. The technique involves dissolution of the sacrificial anodes to provide an active metal hydroxide as a strong coagulant that destabilizes and amasses particles and then removes them by precipitation or adsorption. Conventional treatments are less efficient and are bulkier with less controllable parameter. This study reviews the effect of various operating parameter i.e. current density, electrolysis time, pH, conductivity, temperature, electrode material and gap on COD removal from the DWW. Some efforts are also given in design and economical aspect of EC process for particularly in dairy wastewater treatment. The characterization of the DWW of the reviewed articles has been analyzed to find suitability and advantages of the EC process in DWW treatment over the conventional treatment.
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