چکیده مقاله
Purpose: Caustic wastewater generated from gas refinery washing processes is considered one of the most challenging industrial effluents to treat due to its resistant organic compounds, high chemical oxygen demand COD , and strong alkalinity In recent years, the combined application of electrochemical techniques and chemical oxidants has attracted significant attention as an effective approach to enhance the removal efficiency of organic pollutants Accordingly, this study aims to evaluate the simultaneous performance of selected oxidants including potassium permanganate, polyaluminum chloride PAC , alum, and hydrogen peroxide in reducing the COD of caustic wastewater Methods: The electrocoagulation process for treating neutralized caustic wastewater was investigated under optimized pH conditions using a direct current applied between iron anode and cathode electrodes The samples consisted of 100 mL of wastewater neutralized with 98% sulfuric acid The effects of oxidant type and dosage, reaction time, and applied current intensity on process performance and COD removal efficiency were evaluated All experiments were conducted in triplicate, and the resulting data were analyzed using Excel and OriginPro software Results: The results demonstrated that the simultaneous application of chemical oxidants with the electrocoagulation process significantly enhanced the removal efficiency of organic compounds and led to a substantial reduction in COD Extending the reaction time to 60 minutes produced the greatest improvement in performance, and the concurrent presence of electric current and oxidants indicated a strong synergistic effect between the chemical and electrochemical processes Conclusion: This study demonstrated that the electrocoagulation process in the presence of chemical oxidants is an effective and efficient approach for reducing the organic and inorganic load of caustic wastewater from gas refineries A reaction time of 60 minutes and an optimal dosage of 2 g of each chemical oxidant yielded the highest COD removal efficiency, whereas excessive chemical dosing resulted in a slight decline in performance The synergistic interaction between chemical and electrochemical processes not only enhanced the removal of organic contaminants but also enabled a notable reduction in heavy metals Therefore, this combined approach can serve as a practical and viable strategy for managing highly alkaline industrial effluents
کلیدواژهها
نویسندگان
Ali Homayoun
Master student of Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran
Seiran Haghgoo
PhD student of Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran
Nader Bahramifar
Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Tehran, Iran
شیوه ارجاع
Homayoun, Ali and Haghgoo, Seiran and Bahramifar, Nader,1404,Investigation of the Effect of Chemical Oxidants on the Electrocoagulation Process for COD Reduction of Caustic Wastewater from the South Pars Gas Complex, Pars Special Economic Energy Zone,The 3rd National Conference on Environmental Challenges: The role of industry, mining, and society in developing green governance,Tehran
ارائهشده در
مجموعه مقالات سومین کنفرانس و نمایشگاه ملی چالش های محیط زیستی: نقش صنعت، معدن و جامعه در گسترش حکمرانی سبز19 آبان 1404 · تهران