نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی هرمزگان، بندرعباس، ایران.
2 دانشجوی کارشناسی ارشد، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی قزوین، قزوین، ایران.
3 استادیار، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی قزوین، قزوین، ایران.
چکیده
اهداف مطالعه حاضر، به‌منظور بهینه‌سازی فرایند انعقاد و لخته‌سازی به‌وسیله کلرورکلسیم و سولفات‌فریک در تصفیه آب‌صابون صنعتی به روش سطح پاسخ انجام شد.
مواد و روش ها با استفاده از دو منعقدکننده کلرورکلسیم و سولفات‌فریک، بازده فرایند انعقاد و لخته‌سازی در حذف اکسیژن لازم شیمیایی (COD) و کدورت و میزان آزادشدن روغن بررسی شد. برای بهینه‌سازی شاخص‌های بهره‌برداری از فرایند، شامل pH و مقدار مصرف ماده منعقدکننده، طرح مرکب مرکزی و روش سطح پاسخ به‌کاررفت. برای محاسبه سه متغیر پاسخ، شامل COD و کدورت و روغن آزادشده، از الگوی درجه دوم استفاده شد.
یافته ها نتایج نشان داد که شرایط بهینه در استفاده از کلرورکلسیم در فرایند انعقاد و لخته‌سازی برابر با مقدار 4 گرم در لیتر و pH برابر 5/3 با میزان حذف COD و کدورت و آزادشدن روغن به‌ترتیب برابر با 93 و 9/96درصد و 8/31 میلی‌لیتر و میزان مطلوب‌بودن برابر با 2/91درصد بود. در زمینه سولفات‌فریک، در شرایط بهینه غلظت 5/6 گرم در لیتر و pH برابر 5/4 با میزان حذف COD و کدورت و آزادشدن روغن به‌ترتیب 1/62 و 6/93درصد و 7/13میلی‌لیتر و میزان مطلوب‌بودن برابر با 91درصد تخمین زده شد.
نتیجه گیری استفاده از منعقدکننده کلرورکلسیم در تصفیه آب‌صابون صنعتی، بازده حذف خوبی در حذف شاخص‌های آلایندگی بررسی‌شده داشت و درمقایسه‌با منعقدکننده متداول، مقدار مصرف منعقدکننده تقریباً 35درصد کمتر بود؛ اما در زمینه بازده حذف آلاینده‌ها، بازده به‌مراتب بهتری داشت.
کلیدواژه‌ها
عنوان مقاله [English]
Application of Response Surface Methodology (RSM) to Optimize Coagulation–flocculation Process for Treatment of Metal Working Fluids Using Calcium Chloride and Ferric Sulfate
نویسندگان [English]
- Kavoos Dindarloo 1
- Ali Arezoumand 2
- Hamza Ali Jamali 3
1 Assistant Professor, Department of Environmental Health Engineering, School of Public Health, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
2 MSc. Student, Department of Environmental Health Engineering, School of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran.
3 Assistant Professor, Department of Environmental Health Engineering, School of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran.
چکیده [English]
Objectives The current study aimed at optimizing the coagulation-flocculation process to treat metal working fluids (MVF) by calcium chloride and ferric sulfate using response surface methodology (RSM).
Methods The removal efficiencies of chemical oxygen demand (COD), turbidity, and the amount of released oil via coagulation process using calcium chloride and ferric sulfate as coagulants were studied. Central Composite Design (CCD) and RSM were used to optimize the operating variables including coagulant dosage and pH. Quadratic models were developed for the 3 responses of COD, turbidity, and released oil from MWF.
Results The results of the current study indicated that the optimum conditions were calcium chloride dosage of 4 g/L at pH 3.5. The COD, turbidity removal efficiency, and oil releasing from MWF were 93%, 96.9%, and 31.8 mL, respectively and the level of desirability was 91.2%. Optimum condition for ferric sulfate was 6.5 g/L at pH 4.5. The COD, turbidity removal efficiency, and oil releasing from MWF were 62.1%, 93.6% and 13.7 mL, respectively and the level of desirability was 91%.
Conclusion Coagulation-flocculation process using calcium chloride, compared with conventional coagulants such as ferric sulfate, was very effective on pollutants removal. Calcium chloride usage was 35% less than common coagulant while removal efficiency was greater.
کلیدواژه‌ها [English]
- Metal Working Fluid
- Coagulation- Flocculation
- Calcium Chloride
- Ferric Sulfate
- Response Surface Methodology
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