This study investigated the possibility of using electrocoagulation to remove nitrates in water. Reactor of continuous flow has been designed in dimensions (0.3m * 0.21m* 0.24m) explain the effects of different parameters on the nitrates removal of water and wastewater. The effects of process parameters such as flow rate (Q) ,applied current (I), hydraulic detention time (HDT), conductivity (EC), initially nitrate concentration (Ci) in the solution, the distance between electrodes (Dis.) and types electrodes material(Aluminium, Brass, stainless steel, Copper and Titanium) and other parameters (pH, the electrode connections, initial temperature (Ti), effective area (Aeff) and volume of tank) are kept constant at 7±0.2, monopolar electrodes in parallel connections, 25±3, 0.16 m2 and 15.12 L respectively during all experiences. Experimental results showed that the removal efficiency of nitrate increased with the increase of every parameter stated except for the initial concentration, the distance between electrodes and flow rate. The optimum conditions are aluminium (Al), applied current of 5 A, flow rate of 0.042 L/min., conductivity of 8 ms, Distance between electrodes of 1cm, and initial concentration of 50 mg-NO-3/L. The results showed that within 6 hours of detention time and at the optimum conditions, the maximum removal efficiency of nitrate is 85.2% . Nonlinear multiple regression models were developed using the program (Excel and data fit 9.1.32) to simulate the experimental results.
Volume 11 | Issue 12