نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشیار، گروه مهندسی بهداشت محیط، دانشکده علوم پزشکی، دانشگاه تربیت مدرس، تهران، ایران.
2 استادیار، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی‌درمانی سبزوار، سبزوار، ایران.
3 دانشجوی کارشناسی و عضو کمیته تحقیقات دانشجویی، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی‌درمانی سبزوار، سبزوار، ایران.
4 دانشجوی کارشناسی و عضو کمیته تحقیقات دانشجویی، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی‌درمانی سبزوار، سبزوار، ایران
5 دانشجوی دکترا، گروه آبخیزداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، تهران، ایران.
چکیده
اهداف مالاتیون یکی از سمومی است که بیشترین مصرف را بین سموم فسفره دارد. این سم اثرات حاد و مزمنی دارد، لذا به دلیل حفظ بهداشت آب و حفاظت انسان در برابر عوارض بهداشتی ناشی از این ترکیبات باید به روش مناسب از فاضلاب‌ها و منابع آب حذف شود. بین روش‌های تصفیه، روش مبتنی بر ازن توجه بیشتری را به خود معطوف کرده است. بین روش‌های ازن، ازن زنی کاتالیستی با کربن فعال یکی از بهترین گزینه‌هاست.
مواد و روش ها در این پژوهش ابتدا فاضلاب مصنوعی از مالاتیون خالص در غلظت مدنظر تهیه شد. سپس آزمایش‌های حذف مالاتیون در یک پایلوت استوانه‌ای به حجم 200 سی‌سی به روش ازن زنی تنها و ازن زنی کاتالیستی با استفاده از کربن فعال‌شده با کلرید آمونیوم (NAC) با پایه چوب حاصل از ضایعات باغی انجام گرفت. متغیرهای آزمایش شامل pH، زمان تماس، غلظت ازن و غلظت کاتالیست بود. در تمام شرایط ازن زنی کاتالیستی جذب تنها و اثر هم افزایی کاتالیست مشخص شد.
یافته ها نتایج نشان داد عملکرد حذف مالاتیون توسط ازن در pH قلیایی بیشتر است. همچنین در حجم 200 سی‌سی نمونه حاوی 50 میلی‌گرم در لیتر مالاتیون و در غلظت کاتالیست 1/0 گرم در لیتر کربن NAC در آزمایش ازن زنی کاتالیستی در زمان 50 دقیقه عملکرد حذف مالاتیون در ازن زنی 9/62درصد و در روش ازن زنی کاتالیستی 100درصد و در جذب تنها 22درصد و اثر هم‌افزایی 1/15درصد بود که نشان‌دهنده عملکرد بالای حذف در روش COP/NAC است.
نتیجه گیری کربن NAC به عنوان کاتالیست مناسب می‌تواند قدرت اکسیداسیون ازن را افزایش دهد.
کلیدواژه‌ها
عنوان مقاله [English]
Investigating Treatment of Malathion Wastewater in Catalytic Ozonation Process by Activated Carbon With Ammonium Chloride for Catalyst
نویسندگان [English]
- Gholamreza Moussavi 1
- Ahamd Allahabadi 2
- Milad Ganbary 3
- Morteza Dab 4
- Fahimeh Mircholi 5
1 Associate Professor, Department of Environmental Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
2 Assistant Professor, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran.
3 BSc. and the Member of the student Research Committee, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran.
4 BSc. and the Member of the student Research Committee, Department of Environmental Health, School of Public Health, Sabzevar University of Medical Sciences, Sabzevar, Iran.
5 Phd. Candidate, Department of Watershed, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, Tehran, Iran.
چکیده [English]
Background Malathion is a pesticide with the highest consumption in phosphoric pesticides. This pesticide has acute and chronic effects. Therefore, for the protection of the water and human health against the harmful effects of these compounds, they must be removed by appropriate treatment of wastewater and water resources. Among the treatment methods, the ozonation process has drawn more attention; one of the best options of ozonation process is the catalytic ozonation process (COP)with activated carbon.
Materials & Methods In this study, at first the synthetic wastewater was prepared at the mentioned concentration with pure malathion. Then, removal malathion experiments in a cylindrical pilot with a total volume of 200 mL were performed by single ozonation and catalytic ozonation process with use of NH4Cl-induced activated carbon (NAC) obtained from of agricultural waste. Study variables included pH, contact time, the concentration of ozone, and the concentration of catalyst. In all conditions, the sole catalytic ozonation adsorption and catalystic synergistic effects were evaluated.
Results The results showed that the removal efficiency of ozone in alkaline pH is higher. Also, in 200 mL samples containing 50 mg/L malathion and 0.1 g/L concentration of catalyst in carbon NAC, in the COP test for 50 minutes, the malathion removal performance was 62.9% in ozonation; 100% in catalytic ozonation, 22% in adsorbtion only, and 15.1% in the synergism effect. It showed the high removal efficiency of COP/NAC.
کلیدواژه‌ها [English]
- Malathion
- Catalytic ozonation
- activated carbon
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