حذف کربن و مواد مغذی از فاضلاب صنعتی با استفاده از لجن گرانولی هوازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه شیمی کاربردی، دانشکده نفت و گاز گچساران، دانشگاه یاسوج، گچساران، ایران

2 دانشجوی کارشناسی، گروه شیمی کاربردی، دانشکده نفت و گاز گچساران، دانشگاه یاسوج، گچساران، ایران

چکیده

با توجه به افزایش سخت‌گیرهای قوانین محیط‌زیست حذف کربن و مواد مغذی از فاضلاب یک جنبه کلیدی و اصلی در پژوهش‌ها است که حذف هم‌زمان آنها دریک بیوراکتور تأثیر به‌سزایی در کم کردن حجم راکتور و مصرف انرژی دارد. در این پژوهش‌، عملکرد یک راکتور منقطع هوازی با لجن گرانولی برای دفع کربن و مواد مغذی از فاضلاب صنعتی بررسی شد. این پژوهش با استفاده از دو متغیر مستقل مهم شامل زمان هوادهی و غلظت زیست توده انجام شد. گرانول‌های هوازی در راکتور SBR به‌دست آمدند و در مرحله بعد آزمایش‌ها بر اساس طرح مرکب مرکزی با پنج سطح از غلظت زیست توده
2000 تا 5000 میلی‌گرم در لیتر و زمان هوادهی 6 تا 24 ساعت انجام شد. هشت پارامتر به‌عنوان پاسخ فرایند اندازه‌گیری و محاسبه شد. نتایج نشان داد که حداکثر مقدار حذف کل کربن آلی در غلظت جامد معلق 5600 میلی‌گرم در لیتر و حداکثر زمان هوادهی 24 ساعت، 07/69 درصد به‌دست آمد. حداکثر کارایی حذف نیتروژن کل به ‌مقدار 5/47 درصد به‌دست آمد که حذف کم نیتروژن کل شرایط راهبری را به‌سمت کاهش سطح اکسیژن از 7 به 3 میلی‌گرم در لیتر سوق داد. کاهش اکسیژن محلول با حالت هوادهی طولانی منجر به افزایش حذف نیتروژن کل و کاهش کارایی حذف TCOD، nbCOD و BOD شد. به‌صورت کلی لجن گرانولی عملکرد نسبتاً خوبی برای حذف کربن نشان داد، اگرچه با هوادهی متناوب حذف مواد مغذی از فاضلاب می‌تواند ارتقا پیدا کند.

کلیدواژه‌ها

عنوان مقاله [English]

Carbon and Nutrients Removal from Industrial Wastewater Using Aerobic Granular Sludge

نویسندگان [English]

  • Azar Asadi 1
  • Sadegh Naraki 2
1 Assist. Prof., Dept. of Applied Chemistry, Faculty of Gas and Petroleum, Yasouj University, Gachsaran, Iran
2 Undergraduate Student, Dept. of Applied Chemistry, Faculty of Gas and Petroleum, Yasouj University, Gachsaran, Iran
چکیده [English]

Considering the increasing rigor of environmental laws, the removal of carbon and nutrients from wastewater is a key aspect of research, and the simultaneous elimination of carbon and nutrients in a bioreactor has a significant impact on reducing reactor volume and energy consumption. The objective of this study was evaluating the performance of an aerobic sequencing batch reactor (SBR) with granulated sludge removing carbon and nutrient (N & P) from an industrial wastewater. Aerobic granules were obtained in a SBR and in the next step, the experiments were designed by a central composite design (CCD) with five levels of biomass concentration (2000-7000 mg/l) and aeration time (6-24 h).  Eight dependent parameters as the process responses were measured and calculated. The results showed that the maximum value of total COD (TCOD) removal was obtained to be 69.07% at mixed liquor volatile suspended solid (MLVSS) concentration of 5600 mg/L and the highest value of the aeration time (24 h). In addition, the low TN removal (47.5%) directed the study to reduce the oxygen level from 7 to 3 mg/L. A reduction in dissolved oxygen (DO) in extended aeration mode led to an increase in TN removal and a decrease in TCOD, nbCOD, and BOD removal. Overall, granular sludge showed an acceptable performance in terms of carbon removal, however, intermittent aeration could improve nutrients removal from wastewaters.

کلیدواژه‌ها [English]

  • Simultaneous Carbon and Nutrients Removal
  • Aerobic Granular Sludge
  • SBR
  • Industrial Wastewater

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مجله آب و فاضلاب
دوره 31، شماره 7 - شماره پیاپی 131
بهمن و اسفند 1399
صفحه 50-62

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