اصلاح و افزایش آب‌دوستی غشاهای الیاف توخالی آلیاژی پلیمری با پلی (‌اتر اتر کتون) سولفونه شده برای تصفیه پساب‌های نفتی با استفاده از فرایند بیوراکتور غشایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه مهندسی شیمی، مرکز تحقیقات علوم و فناوری غشا، دانشگاه آزاد اسلامی، گچساران، ایران

2 استادیار، گروه مهندسی شیمی، مرکز تحقیقات علوم و فناوری غشا، دانشگاه آزاد اسلامی، گچساران، ایران

چکیده

آلودگی آب با ترکیبات نفتی یکی از مهم‌ترین معضلات محیط‌زیستی در کشورهای نفت‌خیز محسوب می‌شود، زیرا می‌تواند تاثیرات نامطلوبی بر سلامت انسان و محیط‌زیست بر جای بگذارد. غشاهای الیاف توخالی آب‌دوست از ترکیب پلی آمید ایمید با پلی‌(‌اتراترکتون) سولفونه شده ساخته شدند. ساختار و عملکرد غشاها توسط آنالیز FESEM، نفوذ N2، تخلخل کلی، فشار فروریختگی، زاویه تماس با آب، شار آب خالص و تست‌های دفع مواد نفتی بررسی شد. نتایج نشان داد که با مشاهده تصاویر سطح مقطع غشاها دیده می‌شود که با افزایش نسبت PAI/SPEEK حفره‌های بندانگشتی بزرگتری از سطح خارجی به‌سمت ضخامت غشا رشد کرده‌اند. با نسبت 15/85 از PAI/SPEEK، زاویه تماس آب غشا از 74 به 58 کاهش یافت که بهبود قابل توجهی در آب‌دوستی نشان داد. شار آب غشاها در مدت زمان 5/2 ساعت از عملیات کاهش تدریجی نشان داد و سپس به حالت پایدار با کمترین تغییرات رسید. غشای PAI ساده و غشای مخلوط PAI-SPEEK به ترتیب حدود 35 درصد و 21 درصد کاهش شار آب را نشان دادند. در فشار 5 اتمسفر با افزودن 30 میلی‌گرم در لیتر از آنزیم OSEII نسبت نفت به آب از 36ppm به 2/1ppm  کاهش پیدا کرد که در این شرایط درصد حذف نفت در آب 97 درصد بود. در این کار حالت بهینه در شرایط افزودن OSEII و اعمال هوادهی حاصل شد.

کلیدواژه‌ها


عنوان مقاله [English]

Modification and Enhancement of Hydrophilicity of Hollow Fiber Polymer Alloy Membranes with Sulfonated Poly (Ether Ether Ketone) for the Treatment of Oil Effluents Using the Membrane Bioreactor Process

نویسندگان [English]

  • Ahmad Johari 1
  • Amir Mansourizadeh 2
  • Dariush Emadzadeh 2
1 PhD Student, Dept. of Chemical Engineering, Membrane Science and Technology Research Center, Islamic Azad University, Gachsaran, Iran
2 Assist. Prof., Dept. of Chemical Engineering, Membrane Science and Technology Research Center, Islamic Azad University, Gachsaran, Iran
چکیده [English]

Water pollution with petroleum compounds is one of the most important environmental problems in oil-rich countries, due to its adverse effect on soil, water, and human beings. The hydrophilic hollow fiber membranes were produced by polymer blending of polyamide imide and sulfonated poly ether ether ketone. Membrane structure and function were investigated by field emission scanning electron microscopy analysis, N2 permeation, overall porosity, collapse pressure, water contact angle, pure water flux tests. A membrane bioreactor system was used for oily wastewater treatment. From FESEM, a more open structure with larger finger-like was observed by increasing the PAI / SPEEK ratio. Using the PAI / SPEEK ratio of 85/15, the water contact angle of the membrane was decreased from 74° to 58° which showed a significant hydrophilicity improvement. From compaction test, pure water flux of the membranes showed a gradual decrease during 2.5 h and then reached a steady state with minimal changes. During a period of about 5 hours of the oil separation through the MBR process, the plain PAI membrane and the blend PAI-SPEEK membrane showed water flux reduction of about 35% and 21%, respectively. Under 5 bar transmembrane pressure and the addition of 30 mg/l of oil spill eater (OSEII) enzyme, the oil concentration decreased from 36 ppm to 1.2 ppm in the wastewater, which represents the oil removal efficiency of about 97%. In this work, the optimum state for oil removal was obtained in terms of adding OSEII and aeration.

کلیدواژه‌ها [English]

  • Blend Hollow Fiber Membrane
  • Polyamide Imide
  • Sulfonated Poly (Ether Ether Ketone)
  • Membrane bioreactor
  • Oily wastewater treatment
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