تأثیر زمان ماند لجن بر روی کاهش گرفتگی غشایی در سامانه‌های بیوراکتور غشایی برای تصفیه فاضلاب سنتزی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز

2 دانشیار دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز

چکیده

سامانه بیوراکتور غشایی یکی از سامانه­های نوین در تصفیه فاضلاب است. یکی از محدودیت­های این سامانه گرفتگی غشا می­باشد. ازآنجایی­که زمان ماند لجن (SRT) در این سامانه­ها مهم می­باشد لذا در این مطالعه، تأثیر پارامتر SRT در گرفتگی غشا بررسی شد. برای رسیدن به این هدف یک بیوراکتور غشایی طراحی و ساخته شد و برای سه زمان ماند لجن 12، 24 و 36 روز مورد آزمایش قرار گرفت. نتایج به­دست آمده نشان داد که با توجه به این­که غلظت مخلوط جامد معلق (MLSS) با افزایش زمان ماند لجن افزایش یافت اما میزان فعالیت میکروبی کمی کاهش یافت. با این حال بازدهی حذف خواست اکسیژن شیمیایی (COD) تقریباً در تمامی زمان ماندها یکسان بود. تغییرات فشار مکشی نشان داد برای زمان ماند لجن 12 روز گرفتگی غشا بیشتر از 24 و 36 روز می­باشد. همچنین نتایج نشان داد توزیع اندازه ذرات لجن برای زمان ماند لجن 36 روز بیشتر از حالت­های دیگر است. علاوه بر آن مشخص گردید میزان محصولات میکروبی محلول (SMP) و مواد پلیمری خارج سلولی (EPS) با افزایش زمان ماند کاهش می­یابد. آنالیز شمارش ریزاندام­ها نیز نشان داد افزایش گرفتگی غشا مربوط به باکتری­های رشته­ای و یا دیگر جمعیت میکروبی نمی­باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Solid Retention Time on Membrane Fouling In the Membrane Bioreactor Systems for Treating Synthetic Wastewater

نویسندگان [English]

  • Hossein Hazrati 1
  • Mohammad Rostamizadeh 2
  • Mohammad Atashzar 1
1 Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
2 Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
چکیده [English]

     In current years, the application of membrane bioreactor (MBR) instead of the conventional activated sludge process (CASP) is becoming more common. MBR has many advantages over the CASP such as high removal efficiency and the flexibility of operations. However, the major obstacle for MBRs is membrane fouling. Previous works showed that membrane fouling is related to the operating parameters such as HRT (Hazrati et al., 2016), sludge retention time (SRT), and sludge specifications (e.g. floc size, extracellular polymeric substance (EPS), soluble microbial product (SMP) and sludge viscosity) (Hazrati and Shayegan, 2016). It is well known that SRT is one of the important factors, which can change the state of biomass in an activated sludge system. Considering the aspects mentioned above, SRTs have significant effects on biological activity and membrane performance in MBR systems. In this study, a system was operated with synthetic wastewater. The main purpose of this study was to investigate the effect of SRT on specific biological activity and membrane fouling in a membrane bioreactor.

کلیدواژه‌ها [English]

  • MBR
  • Wastewater treatment
  • Membrane fouling
  • SRT
  • Filamentous bacteria

قادری ف، آیتی ب، "بررسی کارایی سیستم‌های MBBR و SBAR در تصفیه فاضلاب سمی فرمالدئید"، نشریه عمران و محیط زیست دانشگاه تبریز، 1393، 74، 99-106.

پژوم شریعتی ف، قادری ف، حائری ح، "ستفاده از راکتور بیولوژیکی MBBR حاوی مدیایKaldness  در تصفیه فاضلاب حاوی برش­های نفتی سبک"، نشریه عمران و محیط زیست دانشگاه تبریز، 1397، آماده انتشار.

Alighardashi A, Pakan1a M, Jamshidi2b S, Shariati3c FP, “Performance evaluation of membrane bioreactor (MBR) coupled with activated carbon on tannery wastewater treatment’’, Membrane Water Treatment, 2017, 8 (6), 517-528.
Annop S, Sridang P, Puetpaiboon U, Grasmick A, “Effect of solids retention time on membrane fouling intensity in two-stage submerged anaerobic membrane bioreactors treating palm oil mill effluent’’, Environmental technology, 2014, 35 (20), 2634-2642.
Arabi S, Nakhla G, “Impact of protein/carbohydrate ratio in the feed wastewater on the membrane fouling in membrane bioreactors’’, Journal of Membrane Science, 2008, 324 (1), 142-150.
Chang I, Lee C, Ahn K, “Membrane filtration characteristics in membrane-coupled activated sludge system: The effect of floc structure on membrane fouling’’, Separation science and technology, 1999, 34 (9), 1743-1758.
Chang S, “Application of submerged hollow fiber membrane in membrane bioreactors: Filtration principles, operation, and membrane fouling’’, Desalination, 2011, 283, 31-39.
Chen K, Wang X, Li X, Qian J, Xiao X, “Impacts of sludge retention time on the performance of submerged membrane bioreactor with the addition of calcium ion’’, Separation and Purification Technology, 2011, 82, 148-155.
Ebrahimi M, Gholikandi GB, Jamshidi S, Ezzo H, “Dolomite Reactor, a Retrofitting Approach for Activated Sludge Against Bulking’’, Iranian Journal of Science and Technology, Transactions A: Science, 2018, 42 (3), 1215-1221.
Federation WE, Association APH, “Standard methods for the examination of water and wastewater’’, American Public Health Association (APHA): Washington, DC, USA, 2005.
Han S-S, Bae T-H, Jang G-G, Tak T-M, “Influence of sludge retention time on membrane fouling and bioactivities in membrane bioreactor system’’, Process Biochemistry, 2005, 40 (7), 2393-2400.
Hazrati H, Shayegan J, “Effective Parameters on Increasing Filamentous Bacteria and Their Effects on Membrane Fouling in MBR’’, 2013.
Hazrati H, Shayegan J, “Influence of suspended carrier on membrane fouling and biological removal of styrene and ethylbenzene in MBR’’, Journal of the Taiwan Institute of Chemical Engineers, 2016, 64 59-68.
Hazrati H, Shayegan J, Mojtaba Seyedi S, “The effect of HRT and carriers on the sludge specifications in MBR to remove VOCs from petrochemical wastewater’’, Desalination and Water Treatment, 2016, 57 (46), 21730-21742.
Huang X, Gui P, Qian Y, “Effect of sludge retention time on microbial behaviour in a submerged membrane bioreactor’’, Process Biochemistry, 2001, 36 (10), 1001-1006.
Jenkins D, Richard MG, Daigger GT. 1993. Manual on the causes and control of activated sludge bulking and foaming. 2. In: Manual on the causes and control of activated sludge bulking and foaming. 2. ed: Lewis.
Ji J, Qiu J, Wai N, Wong F-S, Li Y, “Influence of organic and inorganic flocculants on physical-chemical properties of biomass and membrane-fouling rate’’, Water research, 2010, 44 (5), 1627-1635.
Jin L, Ong SL, Ng HY, “Fouling control mechanism by suspended biofilm carriers addition in submerged ceramic membrane bioreactors’’, Journal of membrane science, 2013, 427, 250-258.
Jorand F, Guicherd P, Urbain V, Manem J, Block J, “Hydrophobicity of activated sludge flocs and laboratory-grown bacteria’’, Water Science and Technology, 1994, 30 (11), 211-218.
Kimura K, Naruse T, Watanabe Y, “Changes in characteristics of soluble microbial products in membrane bioreactors associated with different solid retention times: Relation to membrane fouling’’, Water research, 2009, 43 (4), 1033-1039.
Koseoglu H, Yigit N, Iversen V, Drews A, Kitis M, Lesjean B, Kraume M, “Effects of several different flux enhancing chemicals on filterability and fouling reduction of membrane bioreactor (MBR) mixed liquors’’, Journal of Membrane Science, 2008, 320 (1), 57-64.
Leu S-Y, Chan L, Stenstrom MK, “Toward long solids retention time of activated sludge processes: benefits in energy saving, effluent quality, and stability’’, Water Environment Research, 2012, 84 (1), 42-53.
Liang S, Liu C, Song L, “Soluble microbial products in membrane bioreactor operation: behaviors, characteristics, and fouling potential’’, Water Research, 2007, 41 (1), 95-101.
Lin H, Liao B-Q, Chen J, Gao W, Wang L, Wang F, Lu X, “New insights into membrane fouling in a submerged anaerobic membrane bioreactor based on characterization of cake sludge and bulk sludge’’, Bioresource technology, 2011, 102 (3), 2373-2379.
Lin H, Zhang M, Wang F, Meng F, Liao B-Q, Hong H, Chen J, Gao W, “A critical review of extracellular polymeric substances (EPSs) in membrane bioreactors: characteristics, roles in membrane fouling and control strategies’’, Journal of Membrane Science, 2014, 460, 110-125.
Liu Y, Liu Q, Li J, Ngo HH, Guo W, Hu J, Gao M-t, Wang Q, Hou Y, “Effect of magnetic powder on membrane fouling mitigation and microbial community/composition in membrane bioreactors (MBRs) for municipal wastewater treatment’’, Bioresource Technology, 2018, 249 (Supplement C), 377-385.
Massé A, Spérandio M, Cabassud C, “Comparison of sludge characteristics and performance of a submerged membrane bioreactor and an activated sludge process at high solids retention time’’, Water Research, 2006, 40 (12), 2405-2415.
Meng F, Chae S-R, Drews A, Kraume M, Shin H-S, Yang F, “Recent advances in membrane bioreactors (MBRs): membrane fouling and membrane material’’, Water research, 2009, 43 (6), 1489-1512.
Meng L, Xi J, Yeung M, “Degradation of extracellular polymeric substances (EPS) extracted from activated sludge by low-concentration ozonation’’, Chemosphere, 2016, 147, 248-255.
Ng HY, Tan TW, Ong SL, “Membrane fouling of submerged membrane bioreactors: impact of mean cell residence time and the contributing factors’’, Environmental science & technology, 2006, 40 (8), 2706-2713.
Ouyang K, Junxin L, “Effect of sludge retention time on sludge characteristics and membrane fouling of membrane bioreactor’’, Journal of Environmental Sciences, 2009, 21 (10), 1329-1335.
Pollice A, Giordano C, Laera G, Saturno D, Mininni G, “Rheology of sludge in a complete retention membrane bioreactor’’, Environmental technology, 2006, 27 (7), 723-732.
Pollice A, Laera G, Saturno D, Giordano C, “Effects of sludge retention time on the performance of a membrane bioreactor treating municipal sewage’’, Journal of membrane science, 2008, 317 (1), 65-70.
Skouteris G, Saroj D, Melidis P, Hai FI, Ouki S, “The effect of activated carbon addition on membrane bioreactor processes for wastewater treatment and reclamation-A critical review’’, Bioresource technology, 2015, 185, 399-410.
Taghipour N, Mosaferi M, Shakerkhatibi M, Jaafarzadeh N, Dehghanzadeh R, HosseinNia H, “Optimized coupling of a submerged membrane electro-bioreactor with pre-anaerobic reactors containing anode electrodes for wastewater treatment and fouling reduction’’, Journal of Water Reuse and Desalination, 2016, jwrd2016063.
Yuniarto A, Noor ZZ, Ujang Z, Olsson G, Aris A, Hadibarata T, “Bio-fouling reducers for improving the performance of an aerobic submerged membrane bioreactor treating palm oil mill effluent’’, Desalination, 2013, 316 146-153.
Yuniarto A, Ujang Z, Noor ZZ, “Performance of bio-fouling reducers in aerobic submerged membrane bioreactor for palm oil mill effluent treatment’’, Journal of Technology UTM, 2008, 49, 555-566.
Zhang X, Bishop PL, Kinkle BK, “Comparison of extraction methods for quantifying extracellular polymers in biofilms’’, Water science and technology, 1999, 39 (7), 211-218.
Zhu L, Qi H-y, Kong Y, Yu Y-w, Xu X-y, “Component analysis of extracellular polymeric substances (EPS) during aerobic sludge granulation using FTIR and 3D-EEM technologies’’, Bioresource technology, 2012, 124, 455-459.