ارزیابی کارایی فرایند فنتون در حذف کروم، COD و کدورت از فاضلاب صنایع آبکاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد مرکز تحقیقات بهداشت محیط و گروه مهندسی بهداشت محیط، دانشگاه علوم پزشکی کرمان

2 عضو هیئت علمی مرکز تحقیقات ارتقای سلامت و دانشکده بهداشت، دانشگاه علوم پزشکی زاهدان

3 دانش‌آموخته کارشناسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کرمان

4 کارشناس شیمی کاربردی، دانشکده داروسازی، دانشگاه علوم پزشکی کرمان

چکیده

استفاده وسیع از فلزات سنگین و ترکیبات آنها توسط صنایع، منجر به تخلیه مقادیر زیادی از این آلاینده‌ها به آبهای پذیرنده شده است. در صورتی که این آلاینده‌ها وارد محیط شوند باعث ایجاد مخاطرات بهداشتی می‌شوند. کروم یکی از مهم‌ترین فلزات سنگینی است که حضور آن در محیط‌های آبی نگرانی بزرگی به‌دلیل سمیّت بالا در غلظتهای پایین و قابلیت تجمع در بافتهای ارگانیسم‌ها ایجاد کرده است. هدف از این مطالعه ارزیابی کارایی فرایند فنتون در حذف کروم از فاضلاب صنایع آبکاری به‌عنوان آلاینده اصلی و مؤثر در حذف COD و کدورت بود. پژوهش از نوع توصیفی- مقطعی بوده که در بازه زمانی 3 ماهه سوم سال 89 انجام گردید. نمونه‌برداری از حوضچه متعادل‌سازی فاضلاب صنعت آبکاری واقع در شهرک صنعتی خضراء شهرستان کرمان انجام گرفت. جمع تعداد نمونه‌ها 110 بود. نمونه‌ها بعد از آماده‌سازی در شرایط مختلف (تنظیم pH در مقادیر7،5،2، افزودن H2O2 با درصد وزنی 30 درصد در غلظتهای 500، 1000، 1500، 2000، 2500 و 3000 میلی‌گرم در لیتر و Fe2+ در غلظتهای 100، 200، 400، 800، 1600 و 3200 میلی‌گرم در لیتر) در مدت زمان‌های واکنش 10، 30 و 60 دقیقه مورد آزمایش قرار گرفتند. تمام آزمایش‌ها بر اساس روشهای مندرج در کتاب روشهای استاندارد برای آزمایش آب و فاضلاب انجام گردید. نتایج نشان داد بیشترین میزان حذف کروم در pH برابر 5، نسبت بهینه H2O2/Fe2+ برابر 8000/2000 میلی‌گرم در لیتر و زمان واکنش 10 دقیقه حاصل شد که برابر با 7/99 درصد بود. بالاترین بازدهی حذف COD در pH برابر 2، نسبت بهینه H2O2/Fe2+ برابر 1600/2500 میلی‌گرم در لیتر و زمان واکنش 60 دقیقه به‌دست آمد که به‌میزان 68 درصد حاصل شد. حداکثر حذف کدورت نیز در pH برابر 7، نسبت بهینه H2O2/Fe2+ برابر 400/1500 میلی‌گرم در لیتر و زمان واکنش 10 دقیقه حاصل شد که برابر با 6/97 درصد بود. نتایج به‌دست آمده با نتایج مطالعاتی همچون تجزیه میکروسیستین LR با استفاده از فرایندهای فنتون و فتوفنتون ، قابلیت تصفیه فاضلاب آموکسیلین با ترکیب فرایندهای استخراج و اکسیداسیون فنتون و اسمز معکوس، فرایند سونوالکتروفنتون به‌عنوان یک تکنولوژی جدید برای تخرب آلاینده‌های آلی در آب، اکسیداسیون RDX و HMX توسط فنتون و کاهش COD و حذف روی از فاضلاب صنعت ابریشم مصنوعی با استفاده از ترکیبی از فرایند الکتروفنتون و ترسیب شیمیایی همخوانی دارد. با توجه به نتایج حاصل شده از پژوهش، فرایند فنتون یک فرایند مؤثر در حذف آلاینده‌هایی همچون کروم، COD و کدورت از فاضلابهای صنایع آبکاری بوده و می‌تواند جایگزین مناسبی از نظر کارایی برای سایر روشهای حذف این آلاینده‌ها از فاضلاب باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Performance Evaluation of Fenton Process to Remove Chromium, COD and Turbidity from Electroplating Industry Wastewater

نویسندگان [English]

  • Mohammad Malakootian 1
  • Hossein Jafari Mansourian 2
  • Spmayeh Mousavi 3
  • Mohammad Danesh pajooh 4
1
2
3
4
چکیده [English]

1- استاد مرکز تحقیقات بهداشت محیط و گروه مهندسی بهداشت محیط، دانشگاه علوم پزشکی کرمان (نویسنده مسئول) 3205074 (0341) m.malakootian@yahoo.com 2- عضو هیئت علمی مرکز تحقیقات ارتقای سلامت و دانشکده بهداشت، دانشگاه علوم پزشکی زاهدان 3- دانش‌آموخته کارشناسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی کرمان 4- کارشناس شیمی کاربردی، دانشکده داروسازی، دانشگاه علوم پزشکی کرمان 1. Prof. of Environmental Health Research Center and Dept. of Environmental Health Eng., Kerman University of Medical Sciences, Kerman (Corresponding Author) (+98 0341) 3205074 m.malakootian@yahoo.com 2. Faculty Member of Public Health, Promotion Research Center, Zahedan University of Medical Sciences, Zahedan 3. Grad. BS. of Environmental Health, School of Public Health, Kerman University of Medical Sciences, Kerman 4- BS. of Applied Chemistry, School of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran Extensive use of heavy metals and their compounds in industrial processes and products have lead to discharging a large amount of pollutants (e.g. Chromium) into water sources and aquatic environment. These pollutants cause a variety of human and environmental effects including health problems. There is serious concern regarding the presence of Chromium in marine environment as it causes severe toxic effects on microorganisms and ecosystem. The purpose of this study was to evaluate the efficiency of Fenton process in the removal of chromium from electroplating industry wastewater, as a major and effective pollutant for COD and turbidity  removal. This is a descriptive study, cross-sectional in nature, and was conducted within a period of three months in 2010.  Wastewater samples were taken from a balancing pond located in an electroplating industry in Khazra’ industrial city of Kerman. Almost 110 samples were delivered to the laboratory for analyses. Collected samples were investigated under different conditions (pH levels of 2,5,7, adding  H2O2 with 30% weight at concentrations of 500, 1000, 1500, 2000, 2500, 3000 mg/L as well as Fe2 + with concentrations of 100 , 200, 400, 800, 1600 and 3200 mg/L) and various reaction times of 10, 30 and 60 minutes. All experiments were based on the Standard Methods for Examination of Water & Wastewater. The highest Chromium removal (99.7%) was obtained at pH of 5.0, optimum ratio of H2O2/Fe2+ = 800/2000 mg/L and the reaction time of 10 minutes. The maximum efficiency COD removal (68%) was obtained at pH of 2.0, optimum ratio of H2O2/Fe2+= 1600/2500 mg/L and the reaction time of 60 minutes. The maximum efficiency for Turbidity removal (97.6%) was obtained at pH of 7.0, optimum ratio of H2O2/Fe2+ =400/1500 mg/L and the reaction time 10 minutes. Our findings are in line with the results of previous studies such as Degradation of microcystin-LR toxin by Fenton and Photo-Fenton processes, Feasibility study of treatment of amoxillin wastewater with a combination of extraction, Fenton oxidation and reverse osmosis , Sonoelectro-Fenton process a novel hybrid technique for the destruction of organic pollutions in water, Fenton oxidation of RDX and HMX and Reduction of COD and removal of Zn2+ from rayon industry wastewater by combined electro-Fenton treatment and chemical precipitation. According to the results of this study, the Fenton process is an effective way to remove pollutants such as chromium, COD and turbidity from the wastewater of electroplating industries, and can be replaced by other methods of pollutant removal from wastewater.

کلیدواژه‌ها [English]

  • Fenton Process
  • heavy metals
  • Chromium
  • Electroplating Industry Wastewater

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مجله آب و فاضلاب
دوره 24، شماره 2 - شماره پیاپی 2
پیاپی: 86
مرداد و شهریور 1392
صفحه 2-10

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