بررسی فنی- اقتصادی حذف آنتی‌بیوتیک ریفامپین از محلول آبی با استفاده از فرایند انعقاد الکتریکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه آب و محیط‌زیست، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

2 استادیار، گروه آب و محیط‌زیست، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

3 استاد، گروه آب و محیط‌‌زیست، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

آنتی‌بیوتیک‌ها که به‌طور وسیعی در سراسر جهان تولید و استفاده می‌شوند، در زمره آلاینده‌های نوظهور طبقه‌بندی می‌شوند. این ترکیبات آلی قابلیت حذف توسط بسیاری از روش‌های متداول تصفیه را ندارند. تخلیه مستمر فاضلاب‌های حاوی آنتی‌بیوتیک به محیط‌های آبی می‌تواند منجر به اثرات سوء طولانی مدت بر حیات آبزیان و سلامت انسان شود. ریفامپین پرمصرف‌ترین آنتی‌بیوتیک برای درمان بیماری سل است. به‌همین دلیل حذف آن از آب و فاضلاب اهمیت زیادی دارد. انعقاد الکتریکی یکی از روش‌های پیشرفته تصفیه است که به‌طور مؤثر در حذف ترکیبات پیچیده آلی از جمله داروهای شیمیایی استفاده شده است. این پژوهش با هدف بررسی جنبه‌های فنی- اقتصادی فرایند انعقاد الکتریکی برای حذف آنتی‌بیوتیک ریفامپین از محلول‌های آبی انجام شد. در این پژوهش تأثیر پارامترهای pH اولیه، ولتاژ، سرعت اختلاط، غلظت اولیه ریفامپین، مدت زمان فرایند، فاصله میان الکترودها و شکل و چیدمان الکترودها در داخل راکتور بر کارایی حذف ریفامپین توسط فرایند انعقاد الکتریکی و همچنین بر هزینه عملیاتی فرایند بررسی شد. فرایند انعقاد الکتریکی در یک سیستم ناپیوسته با استفاده از یک راکتور یک لیتری و محلول مصنوعی حاوی ریفامپین به انجام رسید. آزمایش‌ها توسط روش تک‌عاملی طراحی شد و از پارامتر آماری انحراف معیار نسبی برای مقایسه شدت اثرگذاری پارامترها بر فرایند و هزینه‌های آن استفاده شد. بر اساس نتایج به‌دست آمده، در شرایط بهینه شامل pH اولیه 5، فاصله الکترودها 1 سانتی‌متر، ولتاژ 20 ولت، سرعت اختلاط نمونه 200 دور در دقیقه، غلظت اولیه ریفامپین 10 میلی‌گرم در لیتر، زمان 30 دقیقه و استفاده از الکترودهای مشبک با چیدمان موازی، کارایی حذف آنتی‌بیوتیک ریفامپین و هزینه‌های عملیاتی به‌ترتیب 49/92 درصد و 89 دلار آمریکا به‌ازای هر کیلوگرم ریفامپین حذف شده به‌دست آمد. باتوجه به مقدار به‌دست آمده برای RSD، از میان تمام پارامترهای بررسی شده، مدت زمان فرایند، غلظت اولیه ریفامپین، ولتاژ و pH اولیه مؤثرترین پارامترها بر کارایی حذف ریفامپین و هزینه عملیاتی بودند. به‌طور کلی نتایج این پژوهش نشان داد که فرایند انعقاد الکتریکی، قابلیت زیادی برای حذف آنتی‌بیوتیک ریفامپین از آب دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Techno-Economical Investigation of Rifampin Antibiotic Removal from Aqueous Solution Using Electrocoagulation Process

نویسندگان [English]

  • Parisa Ahmadi Barshahi 1
  • Maryam Hassani Zonoozi 2
  • Mohesn Saeedi 3
1 MSc Student, Water and Environment Group, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
2 Assist. Prof., Water and Environment Group, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
3 Prof., Water and Environment Group, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Antibiotics, which are extensively produced and used all over the world, are considered as emerging contaminants. These organic compounds cannot be efficiently removed by traditional methods applied in wastewater treatment plants. Continuous discharge of antibiotic-containing wastewaters into the aquatic environments can lead to long-term adverse effects on aquatic life and human health. Rifampin is the most widely used antibiotic for treatment of tuberculosis. For this reason, its removal from water and wastewater is of high importance. Electrocoagulation is an advanced treatment method which has been effectively applied for removal of complex organic compounds such as chemical drugs. The main aim of the present study is to investigate the techno-economic aspects of the EC process for removal of RIF antibiotic from aqueous solution. In this study, effects of different parameters including initial pH, voltage, stirring speed, initial RIF concentration, reaction time, inter-electrode distance (die), shape of electrodes and their arrangement inside the reactor were evaluated on RIF removal efficiency using the EC process and its operating costs. The EC process was induced in batch mode using a 1 L reactor and synthetic RIF containing solution. The experiments were designed by one-factor-at-a-time method and relative standard deviation was used to compare the grade of the effect of the parameters on removal efficiency and operating costs of the process. Based on the obtained results, under optimal conditions, i.e., initial pH of 5, die of 1 cm, voltage of 20 volt, stirring speed of 200 rpm, initial RIF concentration of 10 mg/l, reaction time of 30 min and hole-punched shape electrodes in horizontal arrangement, the removal efficiency and the operating costs of the process reached about 92.49% and 89 US$/kg RIF removed, respectively. According to RSD values, among all the parameters investigated, reaction time, initial RIF concentration, voltage and initial pH were distinguished as the most effective ones on both RIF removal efficiency and operating costs. Generally, results of the study showed that the EC process has a high ability for removal of RIF antibiotic from water.

کلیدواژه‌ها [English]

  • Antibiotic
  • Rifampin Removal
  • Electrocoagulation
  • Techno-Economical Investigation
  • OFAT Experimental Design Method

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مجله آب و فاضلاب
دوره 32، شماره 3 - شماره پیاپی 134
مرداد و شهریور 1400
صفحه 1-20

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