امکان‌پذیری راه اندازی ‌راکتور بافل‌دار بی‌هوازی (ABR) در تصفیه فاضلاب صنعت نشاسته‌سازی

نوع مقاله : یاداشت‌ فنی

نویسندگان

1 عضو هیئت علمی گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی زنجان

2 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان

چکیده

راکتور بافل‌دار بی‌هوازی (ABR) فرآیندی شامل اتاقکهای مجزای بافل‌دار است که برای راهبری نیازی به تشکیل گرانول ندارد، از اینرو، دوره راه‌اندازی آن کوتاه‌ است. در این تحقیق امکان‌پذیری کاربرد فرآیندABR  برای تصفیه فاضلاب صنعت نشاسته‌سازی با آرد گندم مورد بررسی قرار گرفت. فاضلاب نشاسته‌سازی بعد از حذف مواد معلق توسط ته‌نشینی ثقلی ساده به عنوان ورودی استفاده شد. راه‌اندازی راکتور (حجم 13/5 لیتر و پنج اتاقک) با رقیق‌سازی COD ورودی تا 4500 میلی‌گرم بر لیتر در مدت زمان 9 هفته با استفاده از لجن بذردهی حاصل از هاضم بی‌هوازی تصفیه‌خانه فاضلاب انجام شد. راکتور در زمان ماند هیدرولیکی (HRT) برابر با 72 ساعت در °C35 و بارگذاری آلی اولیه kgCOD/m3.d 1/2 ، موفق به حذف COD تا حدود 61 درصد شد. بهترین عملکرد راکتور در بارگذاری آلی kgCOD/m3.d 2/5 و در زمان ماند هیدرولیکی 2/45 روز با 67 درصد تبدیل COD کسب گردید. مزیت اصلی کاربرد ABR ناشی از ساختار اتاقک‌بندی شده آن می‌باشد. اتاقک اول ABR ممکن است به عنوان یک منطقه بافری در برابر مواد سمی و بازدارنده عمل کند و بنابراین اجازه می‌دهد بقیه اتاقکها با مواد به نسبت بی‌ضرر, یکنواخت شده و ورودی اسیدی‌تر بارگذاری شود. به عبارت دیگر, اتاقکهای بعدی برای حمایت جمعیتهای فعال باکتری‌های حساس متان‌ساز مناسب‌تر خواهد بود.

کلیدواژه‌ها

عنوان مقاله [English]

Feasibility of an Anaerobic Baffled Reactor (ABR) In Treating Starch Industry Wastewater

نویسندگان [English]

  • Ali Assadi 1
  • Hossien Movahedyan 2
  • Abdolrahim Parvaresh 2
1 Faculty Member, Department of Environmental Health Engineering, School of Health, Zanjan University of Medical Sciences
2 Assoc. Prof. of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences
چکیده [English]

The anaerobic baffled reactor (ABR) includes a mixed anaerobic culture separated into compartments and a novel process with a series of vertical baffles at each compartment. It dose not require granulation for its operation, resulting in shorter start-up time. In this study, the feasibility of the ABR process was investigated for the treatment of wheat flour starch wastewater. Simple gravity settling was used to remove suspended solids from the starch wastewater and used as feed. Start-up of a reactor (13.5L with five compartments) using a diluted feed of approximately 4500 mg/L chemical oxygen demand (COD) was accomplished in about 9 weeks using seed sludge from the anaerobic digester of a municipal wastewater treatment plant. The reactor with a hydraulic retention time (HRT) of 72 h at 35°C and an initial organic loading rate (OLR) of 1.2 kgCOD/m3.d showed a removal efficiency of 61% COD. The best reactor performance was observed with an organic loading rate of 2.5 kgCOD/m3.d (or hydraulic retention time of 2.45 d) when a COD conversion of 67% was achieved. The main advantage of using an ABR comes from its compartmentalized structure. The first compartment of an ABR may act as a buffer zone to all toxic and inhibitory materials in the feed and, thus, allows the later compartments to be loaded with a relatively harmless, more uniform, and mostly acidified influent. In this respect, the later compartments would be more likely to support active populations of the relatively sensitive methanogenic bacteria.

کلیدواژه‌ها [English]

  • Anaerobic Baffled Reactor (ABR)
  • Starch Wastewater
  • COD removal
  • Organic Loading

مراجع

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مجله آب و فاضلاب
دوره 18، شماره 1 - شماره پیاپی 1
پیاپی: 61
فروردین و اردیبهشت 1386
صفحه 77-85

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