| Title |
Removal of organics and Ammonia Nitrogen from Tannery Wastewater by Electrochemical Oxidation Process |
| Authors |
이무강(Mu Kang Lee),김영철(Young Chul Kim),박준한(Chur Young Kim),차기철(Gi Cheol Cha) |
| Abstract |
This study was conducted to investigate the removal efficiency of COD and ammonia nitrogen in the wastewater discharged from tannery wastewater treatment plant by electrochemical oxidation process, which was used as pretreatment process for enhancing the J sewage treatment plant in Pusan. In this experiment, the effect of operating parameters including current density of 2.08∼8. 33A/dm², pH 4∼10 and chloride concentration of 3.0∼10.08g/ℓ were studied. With varying current density of 2.08A/dm², 4.17A/dm² and 8.33A/dm², COD removal efficiencies were obtained to 59%, 70% and 78%, respectively after electrolysis for 5 hours. Under the same operating conditions of current density and electrolysis time, the removal efficiencies of ammonia nitrogen were 55%, 78% and 99%, respectively. The removal efficiency of ammonia nitrogen increased about 10% with decreasing pH from 10 to 4. However, COD removal efficiency does not much effect on the pH change. When NaCl was added to the wastewater discharged from the tannery wastewater treatment plant, the removal efficiencies of COD and ammonia nitrogen increased by the electrochemical oxidation process. Also, the electrolysis time reaching to the maximum removal efficiency can be shorten with the addition of NaCl. When the chloride concentration was 10.08g/ℓ, COD removal efficiency was 95%, and ammonia nitrogen was also removed completely after 2 hours operation at current density of 4.17A/dm². |