تصفیه فاضلاب سنتزی به‌وسیله بیوراکتور هوازی- بی‌هوازی حاوی لجن گرانوله برای حذف مواد مغذی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای گروه مهندسی محیط زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

2 دانشیار گروه محیط مهندسی زیست، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور

3 استاد گروه مهندسی شیمی، دانشکده شیمی، دانشگاه مارندران، بابل

4 استادیار گروه شیمی کاربردی، دانشکده شیمی و مرکز تحقیقات آب و فاضلاب، دانشگاه رازی، کرمانشاه

5 کارشناس آزمایشگاه تحقیقاتی نانو مواد مزوپروس، دانشکده شیمی، دانشگاه علم و صتعت ایران

6 دانشجوی دکترای گروه گیاه پزشکی، دانشگاه ولیعصر، رفسنجان

چکیده

تجمع مواد مغذی (کربن، نیتروژن و فسفر) تخلیه شده به آبهای سطحی موجب مشکلات جدی بر خصوصیات اکولوژیکی آبها و تهدید سلامت موجودات آبی و انسان‌ها می‌شود، بنابراین حذف مواد مغذی از فاضلابها قبل از تخلیه به طبیعت برای کاهش اثرات مضر ضروری است. بیوراکتور حاوی لجن گرانوله تلفیقی هوازی- بی‌هوازی (UAASB) برای تصفیه و حذف همزمان ترکیبات کربن، نیتروژن و فسفر کارایی بالایی دارد. در این مطالعه، درصد حذف کربن و فسفر در راکتور UAASB بررسی شد. متغیرهای مورد نظر در آزمایش‌ها، نسبت مواد مغذی COD/N/P و میزان بارگذاری فاضلاب ورودی به سیستم بود. نتایج نشان داد که نسبت مواد مغذی 2/250/1000 و نرخ بارگذاری موادآلی 7 لیتر بر ساعت در زمان ماند هیدرولیکی 6 ساعت، نسبت مواد غذایی به میکروارگانیسم kg COD/kg MLVSS.h 054/0 و نرخ بارگذاری مواد آلی kg/m3.h 15/0 برای حذف مواد مغذی از فاضلاب در بیوراکتور بسیار مطلوب بود. در این شرایط شاخص حجمی لجن 12/53 میلی‌گرم در لیتر، حذف کربن 86 درصد و کاهش فسفر 5/97 درصد مشاهده شد. بنابراین برای دستیابی به بهترین شرایط حذف مواد مغذی، بیوراکتور UAASB با کاهش قابل ملاحظه کربن و فسفر با تنظیم مطلوب نسبت مواد مغذی ورودی به سیستم تغذیه مناسب است.

کلیدواژه‌ها


عنوان مقاله [English]

Treatment of Synthetic Wastewater by Aerobic¬-anaerobic Bioreactor with Granular Sludge Developed for Removal of Nutrients

نویسندگان [English]

  • Malihe Amini 1
  • habibollah younesi 2
  • Ghasem Najafpour 3
  • Ali Akbar Zinatizadeh Lorestani 4
  • Mansoor Anbia 5
  • Mohammad Ali Ziaee Modbooni 6
1 Ph.D Student of Environmental Eng., Faculty of Natural Resources, Tarbiat Modarres University, Noor, Iran
2 Assoc. Prof. of Environmental Eng., Faculty of Natural Resources, Tarbiat Modarres University, Noor, Iran
3 Prof. of Chemical Engineering, Mazandaran, University, Babol, Iran
4 Assist. Prof. of Applied Chemistry, Faculty of Chemistry and Water and Wastewater Research Center (WWRC), Razi University, Kermanshah, Iran
5 Expert of Research Laboratory of Nanoporous Materials, Faculty of Chemistry, Iran University of Science and Technology, Tehran
6 Ph.D. Student of Plant Protection, Vali-e-asr University, Rafsanjan
چکیده [English]

The excessive accumulation of nutrient (C, N, and P) discharge to surface water can pose serious ecological problems that affect the health of aquatic life and consequently that of human and animals. It is, therefore, necessary to remove these substances from wastewaters for reducing their harm to environments. A novel upflow aerobic/anoxic flocculated sludge bioreactor (UAASB) will be establish and apply as a single treatment unit for carbon, nitrogen and phosphorus removal. In this study, nutrients (C, N and P) removal efficiency in a time-based control UAASB reactor has studied. Analyze of nutrients removal efficiency were investigated from wastewater using optimization of factors and effects of variables: COD/N/P ratio and flow rate. Results of experiments showed that COD/N/P ratio 1000/250/2 and Q 7 L/h in HRT 6 h, F/M 0.054 kg COD/kg MLVSS.h and OLR 0.15 kg/m3.h were desirable for removal of nutrients from wastewater in aerobic/anaerobic bioreactor. In these conditions SVI 53.12 mL/g, COD removal efficiency 86% and PO43- removal efficiency 97.5% were showed. According all results of responses for best nutrient removal, UAASB bioreactor is desirable for removal efficiency of C and P. 

کلیدواژه‌ها [English]

  • nutrient
  • Wastewater
  • Bioreactor
  • Granular Sludge
  • Organic Loading Rate
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