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

10.22034/jcee.2020.24656.1598

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

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