حذف آلاینده 4- نیتروفنول به روش راکتور بیولوژیکی بستر متحرک با مدیایBee Cell 2000 و مطالعه شوک‌پذیری راکتور

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه صنعتی قم

چکیده

هشدارهای زیست‌محیطی مرتبط با صنعت در سال‌های گذشته اهمیّت زیادی پیدا کرده‌اند که منجر به افزایش سرمایه‌گذاری برای حفاظت از محیط‌زیست شده. آلاینده‌های نفتی مانند 4- نیتروفنول (Nitrophenol (4-NP)) از مشکلات اجتناب ­ناپذیری است که کشورهای نفت­ خیز با آن مواجه هستند. لذا یافتن راهبردی برای حذف ارزان قیمت این آلاینده‌ها از پساب، یکی از اولویت­ های اصلی صنعت نفت و محیط‌زیست جهانی است. یکی از روش‌هایی که برای تصفیه فاضلاب آلوده به 4- نیتروفنول به ­کار می ­رود، استفاده از راکتورهای بیوفیلم بستر متحرک (Moving Bed Biological Reactor (MBBR)) است. پژوهش حاضر تلاش کرده تا محیط MBBR را برای تصفیه فاضلاب آلوده به 4- نیتروفنول با استفاده از مدیای Bee Cell 2000 بررسی و شرایط بهینه گرمایی را برای این محیط تعیین و گزارش کند. ابتدا میکروارگانیسم‌ها با آلاینده‌ها سازگار شدند و سپس یک لایه بیوفیلم بر روی سطح محیط آکنه در راکتور تشکیل شد. به دنبال آن، با تغییر در غلظت COD اولیه (300-3000 میلی‌گرم در لیتر)، زمان ماند (8، 12، 24 و 48 ساعت)، دما (20، 25 درجه سانتی‌گراد) و نسبت پر شدن (30، 50 و 70 درصد) بازدهی راکتور تعیین و مقایسه شد. بالاترین راندمان در 48 ساعت برابر 98 درصد برای راکتور با آکنه Bee Cell 2000 در نسبت پر شدن 50 درصد و در کمترین غلظت COD ورودی (400 میلی گرم در لیتر) مشاهده شد. راکتور در زمان ماند 84 ساعت قادر به تصفیه فاضلاب آلوده به 4- نیتروفنول در دمای 20 درجه سانتی­گراد بود. همچنین با بررسی سینتک واکنش مشخص گردید این فرآیند از مدل سینتیک اصلاح شده مرتبه دوم Stover-Kincannon پیروی می‌کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Removal of 4-Nitrophenol Contaminant by Moving Bed Biofilm Reactor with Media Bee Cell 2000 and Shock Study

نویسندگان [English]

  • Mahdi Ghaderi
  • Ali Attarzadeh
Department of Civil Engineering; Faculty of Engineering, Qom University of Technology (QUT), Qom, Iran
چکیده [English]

Today, the population of most countries is growing exponentially. Countries whose main economic dependence is on oil production. This issue, along with the lack of a rational management system for increasing fuel consumption, groundwater resources and it has seriously threatened the environment in industrial hubs (Ghaderi et al., 2019). Of the various compounds of water pollutants that enter water sources mainly through raw wastewater and its effluents, phenolic compounds are of special importance and can even enter water sources naturally (Ghaderi et al., 2019; Ghaderi et al., 2020).
Nitrophenol, a member of the phenolic family of pollutants, is a carcinogen and is known for its many adverse effects on humans and aquatic animals. In recent decades, chemical reduction of nitro phenolic compounds has been widely reported as an advanced removal method for such hazardous dyes from reservoirs (Din et al., 2020).
Nitrophenols, which are toxic, inhibitory, and biodegradable organic compounds, are widely used in the chemical industry to make pesticides, dyes, and drugs, and are often found in the effluents of industrial wastewater treatment plants. (Ma et al., 2000).

کلیدواژه‌ها [English]

  • Oil pollutants
  • 4- Nitrophenol
  • Media
  • Moving Bed Biofilm Reactor
  • Shock Study

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