حذف آرسنیک در محیط آبی با روش اسمز معکوس و نانوذره آهن صفر ظرفیتی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد مهندسی آبیاری و زهکشی، دانشگاه محقق اردبیلی، اردبیل، ایران

2 استادیار گروه مهندسی آب، دانشکده کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران

3 دانشیار گروه زیست‌شناسی، دانشکده علوم، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

آرسنیک یکی از خطرناک‌ترین آلایندههای منابع آب است که سلامت انسان و سایر موجودات را تهدید می‌کند. بنابراین حذف آرسنیک از منابع آب در اولویت برنامه‌های بهداشتی قرار دارد. راههای مختلفی برای حذف آرسنیک وجود دارد. در این پژوهش از دو روش اسمز معکوس و نانوذرات آهن صفر ظرفیتی در مقیاس آزمایشگاهی استفاده شد. برای انجام آزمایش، متغیرهای دما، غلظت آرسنیک، pH، غلظت نانوذره آهن و زمان اختلاط در نظر گرفته شد. نتایج پژوهش نشان داد در هر دو روش اسمز معکوس و استفاده از نانوذره آهن، با افزایش غلظت آرسنیک کارایی حذف افزایش یافته است. برای غلظت 5/1 میلیگرم در لیتر به‌ترتیب با 98 و 2/95 درصد حذف آرسنیک، بیشترین راندمان بهدست آمد. در روش اسمز معکوس تأثیر دما وpH مشابه بود و با افزایش این دو متغیر درصد حذف آرسنیک نیز افزایش یافت. در روش اسمز معکوس درصد حذف آرسنیک در pH برابر9 و دمای 30 درجه سلسیوس، به‌ترتیب برابر 98/95 و 56/96 بهدست آمد. نتایج پژوهش نشان داد که افزایش زمان اختلاط و دما در روش حذف آرسنیک با نانوذره آهن باعث افزایش کارایی حذف آرسنیک و افزایش pH باعث کاهش آن میشود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Arsenic Removal Efficiency in Aqueous Solutions Using Reverse Osmosis and Zero-Valent Iron Nanoparticles

نویسندگان [English]

  • Niloofar Saboori 1
  • Javanshir Azizi Mobaser 2
  • Asadolah Asadi 3
1 Former Graduate Student of Irrigatioin and Drainage Engineering, Mohagheghe Ardabili University, Ardabil, Iran
2 Assist. Prof., Department of Water Engineering, Faculty of Agriculture & Natural Resources, Mohaghegh Ardabili University, Ardabili, Iran
3 Assoc. Prof., Department of Biology, Faculty of Sciences, Mohaghegh Ardabili University, Ardabil, Iran
چکیده [English]

Arsenic is one of the most hazardous pollutants of water resources which threaten human health as well as animals. Therefore arsenic removal from water resources is the priority of health programs. There are several ways to remove arsenic. In this study, reverse osmosis and zero-valent iron nanoparticles methods have been used in a laboratory scale. To perform the test, the variables of temperature, arsenic concentration, pH, iron nanoparticle concentration and mixing time were considered. The results indicated that in both methods of reverse osmosis and iron nanoparticle, through increasing arsenic concentration, arsenic removal efficiency has been also increased. At concentration of 1.5 mg per litre in reverse osmosis method, the maximum efficiency was achieved by 98% and 95.2% removal of arsenic respectively. The effect of temperature and pH were similar in reverse osmosis; by increasing these two variables, arsenic removal percentage also increased. The highest removal rates of 95.98% and 95.56% were observed at pH 9 and Temperature 30oC respectively. The results indicated that in iron nanoparticles method the arsenic removal efficiency increases by increasing mixing time and temperature, while it decreases with increasing pH.

کلیدواژه‌ها [English]

  • ARSENIC
  • Reverse Osmosis
  • Zero Valent Iron Nanoparticle
  • Removal
  • Aqueous solutions
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