Electrocoagulation of an Industrial Wastewater Using Copper Electrodes
This project perform a study of an electrocoagulation process using copper (Cu), as sacrifice electrode for industrial wastewater with the objective of improving the water quality, the evaluation and optimization of key variables like pH and the current density are presented and discussed.
A batch cylindrical electrochemical reactor containing a pair of Cu electrodes was used for electrochemical tests. Each electrode was 20.0 cm by 2.5 cm with a surface area of 50 cm2. Batch volumes of 0.3 L were treated in a 1.0 L glass reactor. A direct-current power source supplied the system with 0.5, 1.0 and 2.0 amperes, corresponding to current densities of 10, 20, and 30 mA/cm2. COD, turbidity and Color were used as indicators for obtaining the improving waster quality
Figure 1 shows the results of the COD removal as a function of treatment time at different initial pH values. As observed the best removal takes place at an acidic pH value reaching a 70 % removal. This can be explained since the Cu ions are present in wastewater as a free ion when the pH is low. However, when the pH of the solution is increases the formation of Cu(OH)2(s) takes place and the removal of all colloidal mater occurs.
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