عنوان مقاله
تصفیه ترموفیلیک هوازی شیرابه لندفیل در بیوراکتور بیوفیلمی با بستر متحرک
فهرست مطالب
چکیده
مقدمه
مواد و روش ها
نتایج
نتیجه گیری
بخشی از مقاله
ویژگیهای شیرابه لندفیل و لجن فعال هوازی
شیرابه لندفیل بکارگرفته شده برای تصفیه ، از محل لندفیل تبریز، ایران بدست آمد. نمونه های شیرابه لندفیل جمع آوری شده در دو مقطع زمانی، دارای ویژگیهای مختلفی بودند که در جدول1 نشان داده شده است. لجن فعال شده هوازی بکاررفته به عنوان مایه ازجریان بازیافت خروجی از شفاف کننده کارخانه تصفیه فاضلاب تبریز (WWTP) بدست آمد. ویژگیهای لجن فعال شده در جدول 2 به صورت خلاصه مطرح شده است.
کلمات کلیدی:
AEROBIC THERMOPHILIC TREATMENT OF LANDFILL LEACHATE IN A MOVING-BED BIOFILM BIOREACTOR 1 A. Hajipour, 2 N. Moghadam, *2 M. Nosrati, 2 S. A. Shojaosadati 1 Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran 2 School of Chemical Engineering, College of Engineering, Tarbiat Modares University, Tehran, Iran Received 20 April 2010; revised 27 October 2010; accepted 18 December 2010 ABSTRACT In the present study the landfill leachate obtained from Tabriz Landfill site was first treated in a suspended growth activated sludge bioreactor which then was turned to a moving-bed biofilm bioreactor under thermophilic conditions (50ºC). The average Soluble Chemical Oxygen Demand (SCOD) removal ranged from 70% to 62% as Organic Loading Rate (OLR) increased from 0.454 to 4.678 kgCOD/(m3 .d). Hydraulic Retention Time (HRT) values were set to 12, 14, 16.8, and 21 h. The recycle ratio of biomass ranged from 1 to 1.5. The total biomass concentration was in the range of 2600-3100 mg/Lofwhich 60-65 percent was in the form of biofilm. It was COD removal efficiency was 5% to 10% higher in moving-bed biofilm operation compared to suspended growth one at the same OLR and HRT. Respirometry experiments revealed that readily biodegradable organic compounds accounted for 5.7% and 5.2% of substrate under thermophilic and mesophilic conditions, respectively. The maximum resulting oxygen uptake rates were 0.21 mgO2 /(L.min) and 0.16 mgO2 /(L.min) under thermophilic and mesophilic conditions, respectively. Key words: Landfill leachate; Thermophilic; Aerobic; Moving bed biofilm bioreactor INTRODUCTION Municipal Landfill leachates contain high concentrations of organic content (values of COD vary from 100 to 70900 mg/L), high amounts of ammonia (ranging from 0.2 to 13000 mg/L) and refractory organic materials (Renoua et al., 2008). The ratio of BOD5 /COD, decreases rapidly with the aging of the landfills (Alvarez-Vazquez et al., 2004). The composition of leachates obtained from different sanitary landfills shows a wide variation. Factors determining the quality of such leachates include the age of landfill, precipitation, seasonal weather variation, waste type and composition (Wintgens et al., 2003). Particularly, the age of landfill has a significant effect on the composition of landfill leachate (Baig et al., 1999).
