بررسی عملکرد و مدل‌سازی فرایند بیوفیلمی با بستر متحرک به‌منظور حذف ترکیبات مغذی از فاضلاب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی ایران، تهران

2 استاد گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان

3 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان

چکیده

در این تحقیق، کارایی فرایند بیوفیلمی با بستر متحرک به‌منظور تصفیه بیولوژیکی فاضلابهای حاوی مواد مغذی بررسی شد. فرایند مذکور به‌صورت چهار راکتور جداگانه بی‌هوازی، آنوکسیک و هوازی ساخته شد که به‌صورت سری راهبری شدند. از بیوراکتورها به‌صورت پیوسته و در بارگذاری‌های مختلف ازت و فسفر و زمان‌های ماند هیدرولیکی مختلف بهره برداری شد. در ادامه برای مدل‌سازی بیولوژیکی فرایند از سه مدل حذف آلاینده مرتبه اول، مدل گراو‌ و مدل استوور-کین‌کانن استفاده شد. بر اساس نتایج حاصله و در شرایط بهینه راهبری در راکتور هوازی، نیتریفیکاسیون تقریباً کاملی با متوسط راندمان حذف کل نیتروژن کلدال برابر با 99/72 درصد به وقوع پیوست. متوسط میزان نیتریفیکاسیون ویژه در این راکتور معادل با g NOx-N/kg VSS.h 1/92 بود. در طول مطالعه مشخص شد که میزان حذف فسفر در راکتور هوازی، از لحاظ آماری ارتباط معنی‌داری با میزان آزاد سازی فسفر در راکتور بی‌هوازی دارد. به‌طور کلی نتایج نشان داد که در شرایط بهینه، متوسط راندمان حذف نیتروژن کل و فسفر به‌ترتیب معادل با 9/80 و 8/95 درصد است. در نهایت و با توجه به تحلیل سینتیکی حذف ازت و فسفر، مدل استوور-کین‌کانن به‌عنوان مدل مناسب برای مدل‌سازی فرایند بیوفیلمی با بستر متحرک انتخاب شد.

کلیدواژه‌ها


عنوان مقاله [English]

Performance and Modeling of Moving Bed Biofilm Process for Nutrient Removal from Wastewater

نویسندگان [English]

  • Majid Kermani 1
  • Bijan Bina 2
  • Hossein Movahedian 2
  • Mohammad Mehdi Amin 3
  • Mahnaz Nikaeen 3
1 Assist. Prof. of Environmental Health Eng., Faculty of Public Health, Iran University of Medical Sciences, Tehran
2 Prof. of Environmental Health Engineering, Faculty of Public Health, Isfahan University of Medical Sciences, Isfahan
3 Assist. Prof. of Environmental Health Eng., Faculty of Public Health, Isfahan University of Medical Sciences, Isfahan
چکیده [English]

In this study, experiments have been conducted to evaluate the removal of nutrients from synthetic wastewater using a moving bed biofilm process. For this purpose, the process was applied in series with anaerobic, anoxic, and aerobic units in four separate reactors. Moving bed biofilm reactors were operated continuously at different loading rates of nitrogen and phosphorus and different hydraulic retention times. In addition, for kinetic analysis,first-order substrate removal, Grau, and Stover-Kincannon models were tested with the experimental data. Based on the results obtained, a close to complete nitrification with an average Total Kjeldahl Nitrogen (TKN) removal efficiency of 99.72% was obtained in the aerobic reactor under optimum conditions. In this reactor, the average specific nitrification rate was 1.92 g NOx-N/kg VSS.h. During the study, statistically significant correlation was observed between the aerobic phosphorus removal rate and the anaerobic phosphorus release rate. Under optimum conditions, the average total nitrogen and phosphorus removal efficiencies were 80.9% and 95.8%, respectively. Finally, based on the kinetic analysis and with regard to nitrogen and phosphorus removals, the Stover-Kincannon model was selected as suitable for analyzing the experimental data and modelling of the moving bed biofilm process.

کلیدواژه‌ها [English]

  • MBBR
  • Biofilm carriers
  • Biological nutrient removal (BNR)
  • Sewage Treatment
  • Stover-Kincannon model
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آب و فاضلاب                                                                                                                                                                      شماره 3 سال 1389

 

 
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