مقایسه کارایی نانوذرات مگنتیت Fe3O4 و نانوذرات آهن صفر ظرفیتی در فرایند اکسیداسیون پیشرفته بر پایه دی پراکسی پرسولفات در تصفیه فاضلاب صنعت چرم سازی
محورهای موضوعی : آلودگی محیط زیست (آب و فاضلاب)سید محسن بلادی 1 , رویا مافی غلامی 2 , علی هاشمی زواره 3
1 - کارشناسی ارشد مهندسی عمران محیط زیست، گروه محیط زیست، دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب.
2 - دانشیار گروه محیط زیست، دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب. *(مسوول مکاتبات)
3 - کارشناسی ارشد مهندسی عمران محیط زیست، گروه محیط زیست، دانشکده هنر و معماری، دانشگاه آزاد اسلامی واحد تهران غرب.
کلید واژه: فاضلاب صنعتی, آهن مغناطیسی, اکسیداسیون پیشرفته, پساب خروجی.,
چکیده مقاله :
زمینه و هدف: تصفیه فاضلاب¬های صنعتی بدلیل حضور آلاینده¬های مختلف دشوارتر از فاضلاب های شهری است. فاضلاب تولیدی در صنعت چرم سازی به¬دلیل داشتن بار آلودگی و حضور یون کلرید بالا باید قبل از تخلیه به محیط زیست تصفیه گردد. فرایند اکسیداسیون پیشرفته بر پایه دی پراکسی پرسولفات در حضور عوامل فعال کننده یک فرایند نوین تلقی می‌شود. این فرایند قابلیت زیادی در تصفیه فاضلاب¬هایی با آلودگی بالا را دارد. در این مطالعه، از فرایند آنیون پرسولفات با فعال سازی آهن مغناطیسی (Fe3O4) و آهن صفر ظرفیتی در مقیاس آزمایشگاهی به‌منظور تصفیه و کاهش بار آلی (COD) فاضلاب صنعت چرم سازی استفاده شد. روش بررسی: در این فرایند، تاثیر متغیرهای pH اولیه فاضلاب (9-5)، زمان واکنش (60-0 دقیقه)، غلظت آنیون پرسولفات (200-50 میلی گرم در لیتر) و مقدار نانوذرات حاوی آهن (2-5/0 گرم در لیتر) مورد بررسی قرار گرفتند. یافته ها: بهترین شرایط فرایند اکسیداسیون پیشرفته در حضور آهن صفر ظرفیتی شامل pH برابر 3، مقدار نانوذرات آهن مغناطیسی برابر یک گرم در لیتر و مقدار دی پراکسی پرسولفات برابر 100 میلی‌گرم در لیتر بدست آمد. طی شرایط ذکر شده، کارایی فرایند 85 درصد حاصل شد. یافته‌ها مشخص کرد که فرآیند مذکور COD (COD اولیه برابر 3700 میلی¬گرم در لیتر) را به زیر 1000 میلی‌گرم در لیتر (COD نهایی برابر 555 میلی گرم در لیتر) کاهش داد. بحث و نتیجه گیری: فرایند اکسیداسیون پیشرفته بر پایه دی پراکسی پرسولفات در حضور ترکیبات آهن (آهن صفر ظرفیتی و آهن مغناطیسی) به¬ دلیل کارایی بالا (حذف 85 درصد از COD اولیه و کاهش آن به 555 میلی‌گرم در لیتر)، می‌تواند برای تجزیه و معدنی¬سازی آلاینده¬های محیط¬های آبی به ویژه فاضلاب‌های صنعتی مورد استفاده قرار بگیرد. پساب خروجی از این سیستم می‌تواند به تصفیه خانه فاضلاب شهری تخلیه شود، لذا با کاهش COD به 555 میلی‌گرم در لیتر نمی‌تواند به تنهایی مورد استفاده قرار گیرد.
Background and Objective: Industrial wastewater treatment is more difficult than urban sewage due to the presence of various pollutants. Sewage produced in the leather industry should be treated to the environment due to having a pollution load and the presence of high chloride ion before discharge. The advanced oxidation process based on dioxy persulfate is considered a new process in the presence of active agents. This process has a great capability in wastewater treatment with high pollution. In this study, the anion process of persulfate was used with the activation of magnetic iron (Fe3O4) and zero-valent iron at laboratory scale in order to treat and reduce the organic load (COD) waste water of leather industry. Material and Methodology: In this process, the effect of primary pH variables of wastewater (5-9), reaction time (0-60 minutes), Anion concentration of persulfate (50-200 mg per liter) and the amount of iron-containing nanoparticles (0.5-2 grams per liter) were investigated. Findings: The best conditions of the advanced oxidation process in the presence of zero-valent iron include pH 3، The amount of magnetic iron nanoparticles was equal to one gram per liter and the amount of dioxy persulfate was equal to 100 mg per liter. During the mentioned conditions, the efficiency of the process was achieved by 85 percent. The findings revealed that the initial COD (COD process reduced 3,700 milligrams per liter to below 1,000 milligrams per liter ¬COD final to 555 milligrams per liter. Discussion and Conclusion: Advanced oxidation process based on dioxy persulfate in the presence of iron compounds (zero-valent iron and magnetic iron) due to high performance (removal of 85 percent of primary COD and reduction to 555 milligrams per liter, can be used for decomposition and mineralization of pollutants, pollutants, water, especially industrial sewage. The effluent from this system can be drained into municipal wastewater treatment plants, so by reducing COD to 555 mg per liter, it still cannot be used alone.
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