بررسی تأثیر غلظتهای مختلف فنل بر کارایی برکه تثبیت بی‌هوازی در تصفیه فاضلاب پالایشگاه نفت کرمانشاه

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، عضو هیئت علمی مرکز تحقیقات توسعه اجتماعی و ارتقاء سلامت، دانشگاه علوم پزشکی کرمانشاه

2 دانشجوی کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کرمانشاه

3 دانشیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، عضو هیئت علمی مرکز تحقیقات سلامت، دانشگاه علوم پزشکی کرمانشاه

چکیده

هدف از این تحقیق بررسی تأثیر غلظتهای مختلف فنل بر کارایی برکه تثبیت بی‌هوازی در تصفیه فاضلاب نفت بود. این مطالعه از نوع تجربی تحلیلی بود. برکه تثبیت بی‌هوازی در مقیاس آزمایشگاهی با ابعاد 1×1×2/0 متر با استفاده از ورقه فایبرگلاس با ضخامت 6 میلی‌متر طراحی، ساخته و راه‌اندازی گردید. زمان ماند هیدرولیکی برکه بی‌هوازی در این مطالعه 2 روز و بار هیدرولیکی آن 95 لیتر در روز منظور گردید. پس از راه‌اندازی و بذرپاشی و تثبیت بیولوژیکی، نمونه برداشت شد. در این مطالعه فنل با غلظتهای مختلف 100، 200، 300 و 400 میلی‌گرم در لیتر ورودی پایلوت اضافه شد، سپس پارامترهای NH3، PO4، فنل به‌ترتیب در طول موج  425، 690، 500 نانومتر توسط دستگاه اسپکتروفتومتر برای هریک از نمونه‌ها اندازه‌گیری شدند و همچنین TCOD،SCOD ، TBOD، SBOD و pH نمونه‌ها نیز اندازه‌گیری گردید. نتایج نشان داد که با افزایش غلظت فنل در برکه بی‌هوازی میزان حذف BOD در غلظتهای100، 200، 300 و 400 میلی‌گرم در لیتر فنل از فاضلاب پالایشگاه نفت به‌ترتیب 8/14±71/75، 7/09±67/02، 4/43±61/69 و 6/03±53/5 و برای COD 10/94±76/07، 6/12±68/95، 4/37±62/83 و 3/47±55/63 کاهش یافت. می‌توان گفت این مسئله به‌دلیل سمّیت بالای فنل برای باکتری‌های تصفیه‌کننده فاضلاب نفت است. بیشترین و کمترین راندمان حذف فنل توسط این سیستم برای غلظت 100 میلی‌گرم در لیتر، 89/82 درصد و برای غلظت 400 میلی‌گرم در لیتر 55/86 درصد به‌دست آمد. نتیجه بررسی نشان داد که برکه تثبیت بی‌هوازی در مقیاس پایلوت، در صورت راهبری مناسب، کارایی بالایی در حذف ترکیبات آلی همراه با غلظتهای مختلف فنل دارد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Different Concentrations of Phenol on Anaerobic Stabilization Pond Performance in Treating Petroleum Refinery Wastewater

نویسندگان [English]

  • Ali Almasi 1
  • Abdollah Dargahi 2
  • Meghdad Pirsaheb 3
1 Assoc. Prof. of Environmental Health Eng., Faculty Member of Social Development and Health Promotion Research Centre, Kermanshah University of Medical Sciences, Kermanshah
2 M.Sc. Student of Environmental Health Eng., Kermanshah University of Medical Sciences, Kermanshah
3 Assoc. Prof. of Environmental Health Eng., Faculty Member of d Health Research Centre, Kermanshah University of Medical Sciences, Kermanshah
چکیده [English]

In this study the efficiency of anaerobic stabilization pond for treating oil refinery wastewater at different concentrations of phenol is investigated. The anaerobic stabilization pond (ASP) was built from fiberglass plats (0.2m×1m×1m and 6mm thickness). The experimental apparatus was performed at HRT (2d) with hydraulic loading rate 95L/day. After inoculation of the biomass, reactor was run at different concentrations of phenol (100, 200, 300, and 400 mg/L). Sampling is carried out from effluent after achievement of steady state condition at all experimental tests. The samples for the determination of NH3, PO4 and Phenol, were analyzed using a spectrophotometer (Varian, UV-120-02). In addition, other parameters such as TCOD, SCOD, TBOD, SBOD, and pH were determined using standard methods. The results showed that the efficiency of system reduced at phenol concentrations of 100, 200, 300, 400 mg/L. The maximum and minimum removal rates of BOD and COD were 71.75±8.14; 76.07± 10.94 and 53.5±6.03, 55.63±3.47 by the system respectively at phenol concentrations of 100 and 400 mg/l. The optimum condition for phenol removal (89.82% and 55.86%) was determined with phenol concentrations of 100 mg/L and 400 mg/L, respectively. This study showed a comprehensive efficiency of anaerobic stabilization pond as a promising system to eliminate different concentrations of Phenol, COD and BOD, however increase of Phenol concentration to 400 mg/L was decreasing of system efficiency due to phenol toxicity for biomass.

کلیدواژه‌ها [English]

  • Anaerobic Stabilization Pond
  • Phenol
  • Wastewater Treatment
  • Oil
  • Kermanshah

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