تصفیه فاضلاب واقعی پتروشیمی در سیستم‌ بیوراکتور غشایی همراه با اصلاح رفتار گرفتگی غشا با کربن فعال گرانوله: مطالعه موردی

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
ناصر کریمی 1
حسین حضرتی 2
اسماعیل فاتحی فر 3
1 دانشجوی دانشگاه صنعتی سهند
2 استادیار دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز، ایران
3 استاد دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز، ایران
چکیده
در این تحقیق بیوراکتور غشایی غوطه‌ور برای تصفیه فاضلاب مجتمع پتروشیمی مورد بررسی قرار گرفت. لجن اولیه در این تحقیق از لجن برگشتی سیستم تصفیه فاضلاب مجتمع پتروشیمی تهیه شد. غشای مورد استفاده در این پژوهش، مسطح و از جنس پلی وینیلیدین فلوراید بود. سایز حفره ها، تخلخل و میزان سطح برای غشا به ترتیب، 1/0 میکرون، 73% و 004/0 مترمربع بود. در این مطالعه، توزیع اندازه ذرات، SMP، EPS برای لجن اندازه­گیری شد. همچنین برای تعیین مشخصات کیک از تست FTIR نیز استفاده شد. میزان فشار بحرانی برای غشای مذکور نیز اندازه­گیری شد که مقدار آن kPa 2/0 بدست آمد. این تحقیق در دو مرحله جداگانه انجام گرفت. در مرحله اول، پایلوت برای 35 روز به‌صورت پیوسته عمل کرد. نتایج به دست آمده نشان داد که با وجود گرفتگی غشا، شار خروجی غشا از بازده مطلوبی برخوردار بود و بعد از هر دوره 7 روزه، بازیابی شار خروجی بیشتر از 90 درصد را نشان داد. در این مطالعه حذف COD بیشتر از 85 درصد، در شرایط MLSS و HRT به ترتیب،300±3000 میلی‌گرم بر لیتر و 14-16 ساعت حاصل شد. علاوه بر آن، TSS و کدورت در خروجی به ترتیب، کمتر از mg/L 1 و NTU 12 حاصل شد. در مرحله دوم از کربن فعال برای کاهش گرفتگی غشا استفاده شد. در راکتور حاوی کربن فعال، میزان افت شار، 22 درصد کمتر صورت گرفت که از جمله دلایل آن می‌توان به افزایش اندازه لخته‌ها، کاهش SMP در لجن و کاهش مقاومت حفرات غشا اشاره نمود

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Petrochemical wastewater treatment by membrane bioreactor with behavior modify of membrane fouling through granule activated carbon: A case study

نویسندگان English

Naser Karimi 1
Hossein Hazrati 2
esmaeil fatehifar 3
1 MsC Student, Department of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
2 Assistant Prof. Department of Chemical Engineering, sahand university of technology, Tabriz, Iran
3 Professor, Department of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
چکیده English

In this study, petrochemical complex wastewater was investigated by submerged membrane bioreactor (MBR). Initial sludge was prepared from returned sludge of petrochemical complex wastewater treatment plant. Applied membrane is of micro-filtration type made of polyvinylidene fluoride with effective surface of 0.004 m2, porosity of 73% and nominal pore diameter of 0.1 μm. Particle size distribution (PSD), soluble microbial products (SMP), and extracellular polymeric substance (EPS) for sludge were measured. In addition Fourier-transform infrared spectroscopy (FTIR), and EPS analysis were performed for determining the properties of the formed cake. Also was measured critical pressure for membrane in the MBR. The critical pressure value was 0.2 kPa. Therefore, the operating pressure was selected 0.12 kPa. This research was conducted in two phases. In the first phase, the pilot worked for 35 days. The results showed that despite the membrane fouling in initial days, the permission of the membrane still had a good efficiency, and after each 7 days, the membrane was cleaned physically and chemically, which showed a recovery of permeate more than 90%. The COD removal efficiency was achieved more than 85% in MLSS=3000±300 mg / L and HRT=14-16 hours. In addition, the TSS and turbidity in the output were below 1 mg/L and 12 NTU, respectively. In the second phase, for reducing fouling, the granule activated carbon was added in the sludge. In the reactor containing activated carbon (R2), membrane fouling was carried out with lower rate and also flux drop was lower about 22% compared to reactor without activated carbon. This phenomenon was due to increasing sludge particle size, SMP reduction.

کلیدواژه‌ها English

submerged membrane bioreactor
Petrochemical Wastewater
fouling reduction
granule activated carbon
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مهندسی عمران مدرس
دوره 20، شماره 1
فروردین و اردیبهشت 1399
صفحه 91-103