تاثیر میدان الکتریکی بر عملکرد بایوراکتورهای غشایی و کاهش گرفتگی غشا

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
حسن امینی راد 1
آسیه مهدی زاده 2
1 دانشگاه نوشیروانی بابل
2 دانشگاه صنعتی نوشیروانی بابل
A-1-21318-6
چکیده
تصفیه انواع فاضلاب به دلیل کمبود منابع آب شیرین امری لازم و ضروری است. از میان روش‌های تصفیه فاضلاب، استفاده بایوراکتورهای غشایی به دلیل مزایایی ازجمله کیفیت بالاتر پساب خروجی، جای پای اکولوژیکی کمتر، تولید لجن مازاد کمتر و هزینه‌های راهبری پایین‌تر در حال افزایش روزافزون است. اما باوجود مزایای بسیار، مشکل گرفتگی غشاها از جمله مشکلاتی است که کاربرد این روش را با محدودیت مواجه کرده است. روش‌های متعددی جهت حذف و کاهش گرفتگی غشاها از جمله شستشوی فیزیکی و شیمیایی، انعقاد شیمیایی و غیره وجود دارد که هریک دارای معایبی ازجمله افزایش هزینه، تولید آلاینده‌های ثانویه، افزایش تولید لجن مازاد، کاهش طول عمر و دوام غشا و غیره می‌باشد.

پیشینه: در سال‌های اخیر استفاده از روش انعقاد الکتریکی به‌عنوان روشی جهت کاهش گرفتگی غشا در بایوراکتورهای غشایی (MBR) موردتوجه قرارگرفته است. الکتروبایوراکتورهای غشایی مستغرق سیستم نوینی است که با ترکیب سیستم MBR و میدان الکتریکی سبب کاهش گرفتگی غشا می‌شود.

روش: در تحقیق پیش رو با اعمال میدان الکتریکی با ولتاژ پایین (5/1 ولت بر سانتی­متر) در راکتورMBR اثرات میدان الکتریکی بر سیستم مورد بررسی قرار گرفت.

یافته­ها:. نتایج آزمایش‌ها نشان داد اعمال میدان الکتریکی در این حالت سبب بهبود مشخصات پساب خروجی (کاهش غلظت COD، نیترات و فسفات) و کاهش غلظت EPS و پروتئین SMP می‌گردد. هم‌چنین اعمال میدان الکتریکی در راکتورهای MBR سبب کاهش گرفتگی و بهبود فلاکس خروجی از غشا می‌گردد.

واژگان کلیدی: بایوراکتور غشایی، میدان الکتریکی، گرفتگی بیولوژیکی

کلیدواژه‌ها

موضوعات

عنوان مقاله English

The effect of electric field on membrane bioreactors performance and membrane fouling reduction

نویسنده English

َAsieh Mahdizadeh 2
2 Babol Noshirvani University of Technology
چکیده English

Rapid growth of population is leading to high water consumption and producing large amount of waste water which needs to be treated and being reutilized for reusing purposes. Among sewage treatment methods, the use of integrated activated sludge and membrane separation is increasing due to advantages such as higher quality effluents, lower ecological footprint, less sludge production, and lower operational costs. Despite the many benefits, the problem of membrane fouling due to deposition and adsorption of colloidal and soluble material on the surface of membrane has limited the use of this method. There are several methods for eliminating and mitigating membrane fouling, each with disadvantages such as increasing costs, producing secondary pollutants, increasing sludge production, reducing the membrane life and durability, etc. In recent years, the use of electrical coagulation as a method to reduce membrane fouling in the MBR system has been taken into account. Submerged Membrane Electro Bioreactors (SMEBR) is a new approach that reduces clogging of the membrane by combining the MBR system with the electric field. In the forthcoming research, the effects of electric field on the system were investigated by applying a low voltage electric field (1.5 volts per cm) in the MBR reactor. The results of the experiments showed that applying the electric field in this case improves the characteristics of the wastewater (reducing the concentration of COD, nitrate and phosphate) and reducing the concentration of external polymeric substance (EPS) and soluble material product (SMP) protein. Also, the application of an electric field in MBR reactors reduces fouling and improves the output flux more than the conventional membrane.



Key words: Membrane bioreactor, Electric Field, Biofouling

کلیدواژه‌ها English

Bioreactor
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مهندسی عمران مدرس
دوره 24، شماره 2
خرداد و تیر 1403
صفحه 99-110