IJE TRANSACTIONS B: Applications Vol. 32, No. 5 (May 2019) 634-640   

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F. Ardestani and M. Abbasi
( Received: October 10, 2018 – Accepted in Revised Form: March 07, 2019 )

Abstract    This research evaluated the efficiency of combined anaerobic-aerobic processes for the treatment of slaughterhouse wastewater. The anaerobic reactor consists of a 3.95 L Plexiglas column with 60 mm diameter and 140 cm height. The cylindrical particles of polyvinyl chloride with 2 mm diameter and 1250 kg m-3 density packed to 60 cm of column were used as biomass saving material. The designed aerobic reactor also has a Plexiglas column with 10 cm internal diameter, 90 cm height and 60 cm useful height. Anaerobic fluid bed and aerobic mobile bed reactors were exploited for retention times of 18, 24, 32, 40 and 48 h. The efficiency of total suspended solids, biological oxygen demand and chemical oxygen demand removing were evaluated in different stages. Under the applied condition, chemical oxygen demand, biological oxygen demand and suspended solids were removed by 85.94, 92 and 66%, respectively. Maximum methane production of 3765 mL per day was obtained after 31 h at the residence time of 18 h. The anaerobic reactor plays very important role in reduction of the chemical oxygen demand, and the aerobic reactor is necessary to clear the anaerobic treated wastewater and ensure the quality of the final waste.


Keywords    Anaerobic Bioreactor; Biological Oxygen Demand; Chemical Oxygen Demand; Poultry Slaughterhouse; Wastewater Treatment



این تحقیق به منظور تعیین کارایی ترکیب فرآیندهای بی‌هوازی- هوازی برای تصفیه فاضلاب کشتارگاه انجام شد. راکتور بی‌هوازی از یک ستون پلکسی گلاس 95/3 لیتری با قطر 60 میلی‌متر و ارتفاع 140 سانتی‌متر تشکیل شده است. ذرات استوانه‌ای شکل از جنس پی‌وی‌سی با قطر 2 میلی‌لیتر با دانسیته 1250 کیلوگرم بر متر مکعب معادل 60 سانتی‌متر از ارتفاع ستون به عنوان نگهدارنده بیومس استفاده شد. راکتور هوازی دارای یک ستون پلکسی گلاس با قطر داخلی 10 سانتی‌متر و ارتفاع 90 سانتی‌متر با 60 سانتی‌متر ارتفاع مفید بود. راکتورهای بستر سیال بی‌هوازی و بستر متحرک هوازی تحت پنج زمان ماند هیدرولیکی به ترتیب 18، 24، 32، 40 و 48 ساعت بهره‌برداری شد و راندمان حذف مواد جامد معلق، اکسیژن‌خواهی بیولوژیکی و اکسیژن‌خواهی شیمیایی در مراحل مختلف مورد ارزیابی قرار گرفت. تحت شرایط به کار گرفته شده، کاهش اکسیژن‌خواهی شیمیایی، اکسیژن‌خواهی بیولوژیکی و مواد جامد معلق به ترتیب برابر 94/85%، 92% و 66% بود. بیشترین میزان تولید متان معادل با 3765 میلی‌لیتر در روز پس از 31 ساعت با زمان اقامت 18 ساعت به دست آمد. راکتور بی‌هوازی نقش بسیار مهمی در کاهش اکسیژن‌خواهی شیمیایی بازی می‌کند و راکتور هوازی برای زلال‌سازی فاضلاب تصفیه شده بی‌هوازی و اطمینان از بهبود کیفیت پساب نهایی مورد نیاز می‌باشد.


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