Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1642-1649    Article in Press

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  THE STUDY OF ORGANIC REMOVAL EFFICIENCY AND MEMBRANE FOULING IN A SUBMERGED MEMBRANE BIOREACTOR TREATING VEGETABLE OIL WASTEWATER
 
E. Abdollahzadeh Sharghi, A. Shorgashti and B. Bonakdarpour
 
( Received: August 28, 2016 – Accepted in Revised Form: September 30, 2016 )
 
 

Abstract    The characterizations of vegetable oil wastewater (VOW) are unpleasant odor, dark color, and high organic contents, including large amounts of oil and grease (O&G), chemical oxygen demand (COD), fatty acids and lipids. Therefore, VOWs should be treated efficiently to avoid the environment pollution. The aim of present study was the investigation of VOW biological treatment using membrane bioreactor (MBR) in terms of organic pollutant removal performance and membrane fouling. During the 30 days MBR operation at hydraulic retention time and solid retention time of 48 h and 20 days, respectively, there was a consistently low turbidity (<2 NTU) in the MBR effluent. The COD and O&G removal efficiency from the wastewater using MBR were 85.0±1.3% and 82.7±1.4%, respectively. With decrease in aerobic metabolic activity and hence the activated sludge growth rate during the MBR operation, MLSS and MLVSS decreased and led to accumulation of O&G and soluble microbial products (SMP) inside the bioreactor. The effluent COD value and the transmembrane pressure during the MBR operation remained in the range 88.7±11.5 mg L-1 and 1-2 kPa, respectively. The current study shows that the MBR has a very good potential for treatment of VOW, both in terms of removal performance and membrane fouling.

 

Keywords    Membrane Bioreactor, Vegetable Oil Wastewater, Biological treatment, Organic pollutant removal, Membrane fouling.

 

چکیده    خصوصیات فاضلاب روغن نباتی (VOW) به طور کلی بوی زننده، رنگ تیره، و محتوای آلی بالا، از جمله مقادیر زیاد روغن و گریس (O&G)، اکسیژن مورد نیاز شیمیایی (COD)، اسیدهای چرب و چربی است. بنابراین، باید برای جلوگیری از آلودگی محیط زیست، VOW بطور مناسبی تصفیه شوند. هدف این مطالعه، بررسی تصفیه بیولوژیکی VOW با استفاده از یک بیوراکتور غشایی (MBR) از لحاظ عملکرد حذف آلاینده های آلی و گرفتگی غشاء بود. در طول 30 روز عملیات MBR در زمان ماند هیدرولیکی و زمان ماند جامد 48 ساعت و 20 روز به ترتیب، کدورت خروجی MBR به طور پیوسته کم ( NTU2<) بود. بازده حذف COD و O&G از پساب توسط MBR، % 3/1± 0/85 و % 4/1± 7/82 به ترتیب بدست آمد. با کاهش فعالیت متابولیک هوازی و در نتیجه سرعت رشد لجن فعال در طول عملیات MBR، غلظت MLSS و MLVSS کاهش یافت و در نتیجه تجمع O&G و محصولات محلول میکروبی (SMP) در داخل بیوراکتور رخ داد. مقدار COD پساب خروجی و فشار عبوری دو طرف غشا در طول عملیات MBR در محدوده 5/11± 7/88 میلی گرم بر لیتر و 2-1 کیلو پاسکال به ترتیب باقی ماند. نتایج حاصل از این تحقیق پتانسیل بسیار خوبی از MBR، هم از نظر عملکرد حذف و هم از نظر گرفتگی غشاء را برای تصفیه VOWs نشان می دهد.

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