بررسی کارایی فرایند شناورسازی با هوای محلول در حذف آنیلین از محیط‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی گروه بهداشت محیط، دانشگاه علوم پزشکی زابل

2 دانشیار، دانشکده بهداشت، دانشگاه علوم پزشکی زاهدان

3 استاد، دانشکده بهداشت، دانشگاه علوم پزشکی زاهدان

4 مدرس دانشگاه جامع علمی کاربردی و دانشجوی دکترای تخصصی مهندسی محیط زیست، دانشگاه شهید بهشتی، دانشکده مهندسی عمران، آب و محیط زیست، تهران

5 مربی، دانشکده بهداشت، دانشگاه علوم پزشکی زاهدان

چکیده

آنیلین به‌عنوان یک ترکیب سخت تجزیه‌پذیر در پساب  بسیاری از صنایع وجود دارد. هدف از انجام این مطالعه تعیین کارایی فرایند شناورسازی با هوای محلول در حذف آنیلین از محیط‌های آبی بود. در این مطالعه کاربردی-تجربی از پایلوت شناورسازی با هوای محلول در مقیاس آزمایشگاهی استفاده شد. پس از تعیین شرایط بهینهpH  و دز پلی آلومینیوم کلراید توسط آزمایش جار، تأثیر پارامترهای مؤثر در فرایند شناورسازی با هوای محلول، شامل غلظت ماده منعقدکننده (10، 20، 30، 40 و 60 میلی‌گرم در لیتر)، زمان لخته‌سازی (5، 10، 15 و 20 دقیقه)، زمان شناورسازی (5، 10، 15 و 20 ثانیه) ، فشار اشباع (3،5/3، 4 و 5/4 اتمسفر) و کدورت NTU) 60، 40، 30، 20 و 10) بر میزان کاهش پارامترهای COD و آنیلین محاسبه شد. نتایج نشان داد که فرایند شناورسازی با هوای محلول می‌تواند پارامترهایCOD  و آنیلین را به‌ترتیب به میزان 6/86 درصد و 95 درصد در pH برابر 6، غلظت اولیه آنیلین معادل200 میلی‌گرم در لیتر، زمان لخته‌سازی 10 دقیقه، زمان شناورسازی 20 ثانیه، فشار اشباع 4 اتمسفر و غلظت 20 میلی‌گرم در لیتر PAC کاهش دهد. همچنین نتایج حاکی از آن بود که با افزایش کدورت در فرایند شناورسازی، راندمان حذف کاهش می‌یابد.با توجه به نتایج به‌دست آمده از این تحقیق می‌توان بیان داشت که فرایند شناورسازی با هوای محلول می‌تواند روش مؤثری برای حذف آنیلین از محیط‌های آبی باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Efficiency of Dissolved Air Flotation Process for Aniline Removal from aquatic Environments

نویسندگان [English]

  • Shahin Ahmadi 1
  • Ferdos Kord Mostafapour 2
  • Edris Bazrafshan 3
  • Zahra Kashitarash Esfahani 4
  • Ataollah Rakhsh Khorshid 5
1 Faculty Member of Environmental Health Engineering, Zabol University of Medical Sciences, Zabol
2 Assoc. Prof., Faculty of Health, Zahedan University of Medical Sciences, Zahedan
3 Prof., Faculty of Health, Zahedan University of Medical Sciences, Zahedan
4 Instructor of Applied Sciences and Technology University, and PhD Candidate of Environmental Engineering, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
5 Instructor, Faculty of Health, Zahedan University of Medical Sciences, Zahedan
چکیده [English]

Aniline is an almost undegradable compound found in many industrial effluents. It was the objective of this lab-scale applied-experimental study to determine the efficiency of the dissolved air flotation process in the removal of aniline from aquatic environments. Initially, the optimal conditions of pH and dosage of poly-aluminum chloride were determined using the jar test. The parameters involved in the dissolved air flotation process including coagulant concentration (10, 20, 30, 40, and 60 mg.l‒1), coagulation time (5, 10 , 15, and 20 min), flotation time (5, 10, 15, and 20 s), saturation pressure (3.5 / 3, 4, and 5.4 atmospheres), and turbidity (10, 20, 30, 40, and 60 NTU) on the reduction of COD and aniline were then calculated. Results showed that the dissolved air flotation process was capable of reducing COD and aniline by 86.6% and 95%, respectively (at pH = 6, an initial aniline concentration of 200 mg/ L, a coagulation time of 10 min, a flotation time of 20 s, a saturation pressure of 4 atmospheres, and a concentration of 20 mg/L PAC). It was also shown that removal efficiency declines with increasing turbidity. It may, therefore, be claimed that the dissolved air flotation process is an effective method of removing aniline from aquatic environments.

کلیدواژه‌ها [English]

  • Dissolved Air Flotation
  • Aquatic Environment
  • aniline
  • Removal

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مجله آب و فاضلاب
دوره 28، شماره 3 - شماره پیاپی 109
مرداد و شهریور 1396
صفحه 64-73

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