بررسی مقایسه‌ای راندمان فرایند الکتروپرسولفات و فرایند الکتروفنتون در حذف فنل از محیط‌های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، ایران

2 کارشناس ارشد مهندسی بهداشت محیط، کارشناس آزمایشگاه، دانشگاه علوم پزشکی و خدمات درمانی البرز، کرج، ایران

3 دانشجوی کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، ایران

4 دانش‌آموخته کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی همدان، ایران

چکیده

فنل یا هیدروکسی بنزن یکی از هیدروکربن‌های آروماتیک سمی است. این ترکیب از طریق دفع فاضلاب تعدادی از صنایع باعث آلودگی محیط زیست و به‌ویژه منابع آبی می‌شود. در این پژوهش حذف فنل در محلول‌های آبی به‌روش الکتروپرسولفات و الکتروفنتون با استفاده از الکترود آهن مورد مطالعه قرار گرفت. در این پژوهش، یک راکتور منقطع الکتروشیمیایی در مقیاس آزمایشگاهی مجهز به چهار الکترود و منبع برق مستقیم مورد استفاده قرار گرفت. در آزمایش‌های انجام شده اثر پارامترهای مؤثر عملیاتی مانند pH اولیه، دانسیته جریان و غلظت اولیه فنل، غلظت اولیه پراکسید هیدروژن و پرسولفات بر راندمان حذف فنل بررسی شد. نتایج نشان داد که فرایند الکتروپرسولفات و الکتروفنتون قادر به حذف فنل با راندمان 18/95 و 99/93 درصد در شرایط عملیاتی pH برابر 3، غلظت اولیه فنل 100 میلی‌گرم در لیتر در غلظت 4/0 میلی‌مولار پراکسید هیدروژن و پرسولفات با دانسیته جریان 07/0 آمپر در دسی‌متر مربع در زمان 45 دقیقه می‌باشند. همچنین با افزایش مقدار پرسولفات و پراکسید هیدروژن از 4/0 به 8/0 میلی‌مولار در فرایند الکتروپرسولفات و الکتروفنتون به‌ترتیب راندمان از 18/95 و 99/93 به 43 و 85 درصد کاهش پیدا کرده است. نتایج پژوهش نشان می‌دهد که فرایندهای الکتروپرسولفات و الکتروفنتون در حذف فنل دارای راندمان حذف یکسانی بوده و به‌طور کلی تلفیق فرایند الکتروشیمیایی و پرسولفات به‌منظور تولید الکتریکی آهن و فعال‌سازی پرسولفات دارای توانایی بیشتری در مقایسه با استفاده مجزا از این فرایندها است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Phenol Removal from Aqueous Solutions by Electrofenton and Electropersulfate Processes

نویسندگان [English]

  • Alireza Rahmani 1
  • Somayeh Akbari 2
  • Fahimeh Zamani 3
  • Zeinab Masoumi 3
  • Roya Harati 3
  • Halimeh Almasi 4
  • Amir Shabanlo 3
1 Prof. of Environmental Engineering, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
2 MSc of Environmental Health Engineering, Expert of Laboratory, Alborz University of Medical Sciences, Karaj, Iran
3 MSc Student of Environmental Health Engineering, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
4 Former Grauate Student of Environmental Health Engineering, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
چکیده [English]

Phenol, or benzene hydroxyl is a toxic aromatic hydrocarbon discharged into the environment through certian industrial effluents which, thereby, pollute water resources. This study examines phenol removal from aqueous solutions through electro-Fenton and electro/persulfate processes using iron electrodes. For this purpose, a laboratory-scale electrochemical batch reactor was used that was equipped with four electrodes and a direct DC power supply. In the tests carried out, the effects of operational parameters such as initial pH; current density; and initial concentrations of phenol, hydrogen peroxide, and persulfate on the removal of phenol were investigated. The results showed that EPS and EF processes achieved phenol removal efficiencies of 95.18% and 93.99%, respectively, at operating conditions of pH = 3, initial phenol concentration of 100 mg/l, hydrogen peroxide and persulfate concentration of 0. 4 mM, and a current density 0.07A/dm2 over 45 min. Increasing persulfate and hydrogen peroxide concentration from 0.4 to 0.8 mM reduced phenol removal efficiencies from 95.18% and 93.99% to 43% and 85%, respectively. Generally speaking, EPS and EF processes exhibited almost identical phenol removal efficiencies. Finally, the integrated electrochemical and persulphate process was found to be more productive in producing electrical iron and persulphate activation than using each single process in isolation.

کلیدواژه‌ها [English]

  • Electrofenton
  • Electropersulfate
  • Phenol
  • Iron Anode
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