1دانشیار، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران.
2کارشناس ارشد، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران.
3استادیار، گروه بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران.
4استادیار، مرکز تحقیقات و فناوری‌های زیست‌محیطی، دانشکده بهداشت، دانشگاه علوم پزشکی جندی‌شاپور اهواز، اهواز، ایران.
تاریخ دریافت: 18 بهمن 1395،
تاریخ پذیرش: 18 بهمن 1395
چکیده
اهداف کروم و کادمیوم ازجمله فلزات سنگین با اثر سوء بهداشتی و زیست‌محیطی هستند که از طریق جریان‌های زائد وارد محیط می‌شوند. به دلیل حلال‌بودن فلزات سنگین در محیط‌های آبی این فلزات به سهولت توسط ارگانیسم‌های زنده جذب می‌شوند و با ورود به زنجیره غذایی در بدن انسان‌ها تجمع زیستی می‌یابند. هدف از این مطالعه تعیین کارایی منعقدکننده پلی‌فریک سولفات در حذف کروم شش‌ظرفیتی و کادمیوم دوظرفیتی از محلول‌های آبی است. مواد و روش ها این مطالعه در مقیاس آزمایشگاهی با استفاده از دستگاه جار اثر متغیرهای pH (4 تا 11)، دزاژ منعقدکننده (10 تا 200 میلی‌گرم بر لیتر)، غلظت اولیه فلز (1 تا 100 میلی‌گرم بر لیتر) و زمان ته‌نشینی (15 تا 90 دقیقه) بررسی شد. غلظت فلزات کروم و کادمیوم به روش اسپکتروفوتومتری جذب اتمی اندازه‌گیری شد. یافته ها نتایج نشان داد بیشترین بازدهی حذف کروم 82/52درصد و کادمیوم 13/93درصد به ترتیب در pH 6 و 9 دزاژ منعقدکننده 100 و 50 میلی‌گرم بر لیتر، مقدار کروم و کادمیوم 100 و 50 میلی‌گرم بر لیتر و زمان ته‌نشینی 30 دقیقه به دست آمد. نتیجه گیری انعقاد و ته‌نشینی با استفاده از پلی‌فریک سولفات می‌تواند به عنوان یک فرایند کارآمد برای حذف کادمیوم و پیش‌تصفیه کروم مدنظر قرار گیرد.
Evaluation of Polyferric Sulfate (PFS) as a Coagulant for Chromium (VI) and Cadmium (II) Removal From Aqueous Solutions
نویسندگان [English]
Afshin Takdastan1؛ Mehdi Jolanejad2؛ Abdolkazem Neisi3؛ Mehrnosh Abtahi4؛ Sahand Jorfi4
1Associate Professor, Department of Environmental Health, Faculty of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
2MSc., Department of Environmental Health, Faculty of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
3Assistant Professor, Department of Environmental Health, Faculty of Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
4Assistant Professor, Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
چکیده [English]
Background Chromium and cadmium are two heavy metals having adverse effects on the health and environment, which are released to environment by waste streams. Because of high solubility, they are absorbed by living organisms and through food chain accumulate in human body. This study aimed to determine the efficiency of the polyferric sulfate (PFS) in removing of Cr6+ and Cd2+ from aqueous solutions. Methods & Materials This study was investigated in bench scale using a jar test apparatus. The effect of pH (4-11), dose of coagulants (10-200 mg/l), initial amount of metals (1-100 mg/l) and settling time (15-9 min) were investigated. Cr and Cd concentration were determined by atomic absorption spectroscopy. Results The result showed that the maximum removal efficiency was 52.82% for Cr and 93.13% for Cd, at pH values of 6 and 9, coagulant dosage of 100 and 50 mg/l, respectively, and settling time for 30 min. Conclusion Coagulation and sedimentation by use of polyferric sulfate can be considered as an efficient process for removal of Cd and pretreatment of Cr.
کلیدواژه‌ها [English]
heavy metals, Hexavalent chromium, cadmium, Polyferric sulphate, Coagulation and sedimentation
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