IJE TRANSACTIONS A: Basics Vol. 30, No. 10 (October 2017) 1417-1424    Article in Press

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P. Ghasemian, E. Abdollahzadeh Sharghi and L. Davarpanah
( Received: June 13, 2017 – Accepted in Revised Form: July 07, 2017 )

Abstract    In this work, the performance of organic pollutant removal, membrane fouling and sludge morphology in a submerged membrane bioreactor (MBR) treating sunflower oil refinery wastewater (SORW) containing high oleic content was studied during 52 days’ operation at short values of 18 h and 10 days for hydraulic retention time and sludge retention time, respectively. The removal efficiencies of chemical oxygen demand (COD), oil and grease (O&G) and turbidity were found to be 73.2±6.6%, 75.1±2.5%, and 99.7±0.1%, respectively and the need for membrane cleaning never rose. The results showed a statistically significant linear correlation between the mixed liquor O&G with soluble microbial products and extracellular polymeric substances (EPS) (rP=0.792; p-value=0.034 and rP=0.920; p-value=0.003, respectively). Additionally, increase in MLVSS concentration which was due to an increase in cell concentration and was not related to accumulation of O&G and biopolymers inside the bioreactor, increased specific oxygen uptake rate. The trend of changes in sludge volume index (SVI) and supernatant turbidity (ST) with EPStotal was also found to be statistically significant (rP=0.736; p-value=0.037 and rP=0.773; p-value=0.024, respectively). The results of SVI, ST, EPS, particle size distribution and microscopic observation showed change in sludge morphology to flocs of smaller size (unimodal, with mode of 20 μm) with high compressibility (SVI=44.0 mL g–1 MLSS) and bioflocculating ability (ST=20.4±3.3 NTU). The results of the present study were indicative of a very good potential of the MBR for treatment of SORWs.


Keywords    Membrane bioreactor, High oleic sunflower oil refinery wastewater, Sludge retention time, Hydraulic retention time, Morphology, Extracellular polymeric substances.


چکیده    در این تحقیق، عملکرد حذف آلاینده های آلی، گرفتگی غشا و مورفولوژي لجن یک بیوراکتور غشایی (MBR) غوطه ور برای تصفیه پساب پالایش روغن آفتابگردان حاوی اسید اولئیک بالا (HOSORW) در طول 52 روز عملیات در مقادیر پایین 18 ساعت و 10 روز برای زمان ماند هیدرولیکی و زمان ماند لجن به ترتیب، مطالعه شد. بازده حذف اکسیژن مورد نیاز شیمیایی (COD)، روغن و گریس (O&G) و کدورت از پساب به ترتیب %6/6±2/73، %5/2±1/75 و %1/0±7/99 بود و نیاز به شستشوی غشا هرگز دیده نشد. نتایج یک رابطه خطی معنی دار آماری بین O&G با محصولات محلول میکروبی و مواد پلیمری خارج سلولی (EPStotal) نشان داد (به ترتیب، 792/0= rP:؛ 034/0=p-value و 920/0= rP:؛ 003/0=p-value). همچنین افزایش غلظت MLVSS که به دلیل یک افزایش در غلظت سلول بوده و به تجمع O&G و پلیمرهای زیستی در داخل راکتور مربوط نبوده، نرخ ویژه مصرف اکسیژن را افزایش داده است. روند تغییرات شاخص حجمی لجن (SVI) و کدورت رویی (ST) با EPStotal از نظر آماری معنی دار بود (به ترتیب، 736/0= rP:؛ 037/0=p-value و 773/0= rP:؛ 024/0=p-value). نتایج حاصل از SVI، ST، EPS، توزیع اندازه ذرات و مشاهده میکروسکوپی نشان دهنده تغییر در مورفولوژی لجن به لخته هایی با اندازه کوچکتر (تک قله ای، با قلهμm 20) با تراکم پذیری (mL g–1 MLSS 0/44=SVI) و توانایی لخته شدن بیولوژیکی (NTU 3/3±4/20=ST) بالاتر بود. نتایج حاصل از این مطالعه نشان دهنده پتانسیل بسیار خوب MBR در تصفیه HOSORWs است.


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