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    The Investigation of COD Treatment and Energy Consumption of Urban Wastewater by a Continuous Electrocoagulation System
    (Korean Electrochemistry Soc, 2022) Sagsoz, Yesim Dede; Yilmaz, Alper Erdem; Torun, Fatma Ekmekyapar; Kocadagistan, Beyhan; Kul, Sinan
    In this study, electrochemical treatment of urban wastewater with electrical conductivity of 1000 mu S cm ??? and chemical oxygen demand of 250 mg L ??? was investigated using the variables of initial pH value, current density and flow rate. Electrocoagulation was used, in which aluminum and stainless steel were selected, as the electrochemical treatment process. The electrocoagulation process was operated in continuous mode. The data obtained in experimental studies show that the best COD removal efficiency occurred in experiments where the initial pH value was 6. The increase in current density from 5 A to 15 A decreased the removal efficiency from 79 to 67%. The increase in flow rate under constant current density also reduced the efficiency of removal as expected. In experiments in which current density and flow rate were examined together, the increase in flow rate allowed the application of higher current densities. This situation led to considerable reductions in energy consumption values, even if the COD removal efficiency did not significantly increase. The high COD removal obtained with the use of high flow rate and high current density indicates that the electrocoagulation process can be used for high flow rate municipal wastewater treatment. Received : 1 July 2021, Accepted : 19 December 2021
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    THE INVESTIGATION OF FLOW RATE EFFECT ON LEACHATE TREATMENT BY ELECTROOXIDATION PROCESS
    (Yildiz Technical Univ, 2020) Yilmaz, Alper Erdem; Dede Sagsoz, Yesim; Sakarya, Merve; Cengiz, Ibrahim
    In the study, the leachate of the Erzurum Municipality Solid Waste Regular Storage Facility was used. Leaching waters formed in solid waste storage areas and the contents depend on rainfall and the characteristics of the stored waste. The leachate includes a high amount of organic matter it contains, nitrogenous substances, heavy metals, high salinity; it causes pollution of underground and surface receiving environments. Therefore leachate must be treated before being discharged. For this purpose, an electrooxidation process was used for the treatment of leachate. The effect of the flow rate change on the treatment efficiency in the continuous electrooxidation process is investigated. The flow rate was selected as 5, 7.5, and 10 ml/min. The constant current of 20 A was applied with a direct current intensity supply (40 V-250 A) in 600 ml. In the reactor (600 ml) at a constant current of 20 A, the effluent water temperature increased from 15 degrees C to 31 degrees C while the pH value was reduced to a value of 8.2 to 4.8. At the constant current of 20 A, approximately 90% chemical oxygen demand (COD) removal was obtained at a flow rate of 5 ml/min, which is the best removal efficiency obtained from flow rate experiments. It is seen from the same study results that the energy consumption value is 55 kWh/m(3) at 20 A current and 5 ml/min flow rate. As a result, the electrooxidation process can be used for the treatment of leachate, especially for organic matter removal.