ارزیابی عملکرد رزین نانو ذرات آهن در کاهش فلوراید از آب

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی تهران

2 دانشجوی کارشناسی ارشد مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی تهران

3 عضو هیئت علمی دانشگاه علوم پزشکی بوشهر، دانشجوی دکترای مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی تهران

چکیده

به‌منظور پیشگیری از خطرات ناشی از مقادیر زیاد فلوراید، حذف این ماده از طریق تصفیه آب تا حد استاندارد آب آشامیدنی، ضروری به‌نظر می‌رسد. هدف از این مطالعه بررسی عملکرد نوعی رزین جاذب آبدار در حذف فلوراید از آب بود. آزمایش‌ها در محیط بسته انجام گردید و تأثیر پارامترهای زمان تماس (5 تا 120 دقیقه) ، ) pH9-3) و ایزوترم‌های جذب مورد بررسی قرار گرفت. میزان جذب فلوراید در آغاز سریع بود، سپس میزان جذب با سرعت کمتری تا رسیدن به‌حالت تعادل در 120 دقیقه ادامه یافت. حذف بهینه فلوراید در محیط‌های اسیدی یعنی pH بین 3 تا 5/5 مشاهده شد. مدل لانگمیر برای توصیف فرایند جذب در این مطالعه مناسب‌تر بود.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluating the Performance of Iron Nano-particle Resin in Removing Fluoride from Water

نویسندگان [English]

  • Amir Hossein Mahvi 1
  • Maryam Rahmani Boldaji 2
  • Sina Dobaradaran 3
1 Assist. Prof. of Environmental Health Eng., Faculty of Public Health, Tehran University of Medical Sciences, Tehran
2 Grad. Student of Environmental Health Eng., Faculty of Public Health, Tehran University of Medical Sciences, Tehran
3 Faculty Member of Bushehr University of Medical Sciences, Ph.D Student of Environmental Health Eng., Faculty of Public Health, Tehran University of Medical Sciences, Tehran
چکیده [English]

Excessive amounts of fluoride in drinking water pose serious health problems. It is, therefore, essential to remove it from drinking water by appropriate water treatment processes down to standard levels for preventing the health risks associated. The aim of this study was to determine the performance of a kind of hybrid sorbent resin in removing fluoride from water. Batch experiments were performed to investigate adsorption isotherms and the effects of experimental parameters such as contact time (5-120 min) and pH (3-9). Results revealed that fluoride adsorption rate was initially rapid but continued at a slower rate before it reached equilibrium in 120 min. Optimum fluoride removal was observed at a pH range of 3-5.5. The data obtained from the experiments were fitted with Langmiur model.

کلیدواژه‌ها [English]

  • Fluoride
  • Sorbent Resin
  • Removal
1- Nasehinia, H. R., and Naseri, S. (2004). “A survey of fluoride dosage in drinking water and DMF index in Damghan city.” J. of Water and Wastewater, 49, 70-72 (In Persian).

2- WHO.(2006). Guidelines for drinking-water quality: Incorporating first addendum, Vol. 1, Recommendations, Word Health Organization,USA.

3- Dobaradaran, S., Mahvi, A. H., Dehdashti, S., and Abadi, D.R.V. ( 2008). “Drinking water fluoride and child dental caries IN Dashtestan, Iran.” Fluoride, 41 (3), 220-226.

4- Harrison, P. T. C. (2005). “Fluoride in water: A UK perspective.” J. of Fluorine Chemistry, 126 (11-12), 1448-1456.

5- Jamode, A. V., Sapkal, V. S., and Jamode, V.S. (2004). “Defluoridation of water using inexpensive adsorbents.” J. of the Indian Institute of Science, 84 (5), 163-171.

6- Chinoy, N. J. (1991). “Effects of fluoride on physiology of some animals and human beings.” Indian J. Environ. Toxicol., 1 (1), 17-32.

7- Rabosky, J. G., and Miller, J. P. (1974). “Fluoride removal by lime precipitation and alum and polyelectrolyte coagulation.” 29th Purdue Industrial Waste Conference,Purdue University,Indiana.

8- Hichour, M., Persin, F., Sandeaux, J., and Gavach, C. (1999). “ Fluoride removal from waters by donnan dialysis.” Separation and Purification Technology, 18 (1), 1-11.

9- Tang, Y., Guan, X., Su, T., Gao, N., and Wang, J. (2009). “Fluoride adsorption onto activated alumina: Modeling the effects of pH and some competing ions.” Colloids and Surfaces A: Physicochemical and Engineering Aspects, 337 (1-3), 33-38.

10- Bower, C.A., and Hatcher, J. T. (1967). “Adsorption of fluoride by soils and minerals.” Soil Science, 103 (3), 151-153.

11- Kumar, E., Bhatnagar, A., Ji, M., Jung, W., Lee, S.H., and Kim, S. J. (2009). “Defluoridation from aqueous solutions by granular ferric hydroxide (GFH).” Water Research, 43 (2), 490-498.

12- Djafer, M., Lamy, I., and Terce, M.(1989). “Interaction of metallic cations with the hydrous goethite (-FeOOH) surface.” Progr. Colloid Polym. Sci., 79, 150-154.

13- Jinadasa, K., Dissanayake, C. B., Weerasooriya, S.V.R., and Senaratne, A.(1993). “Adsorption of fluoride on goethite surfaces-implications on dental epidemiology.” Environmental Geology, 21(4), 251-255.

14- Hiemstra, T. V., and Riemsdijk W.H.(2000). “Fluoride adsorption on goethite in relation to different types of surface sites.” J. Colloid Interface Sci., 225(1), 94-104.

15- Villalobos, M., Trotz, M. A., and Leckie, J. O. (2003). “Variability in goethite surface site density: Evidence from proton and carbonate sorption.” J. Colloid Interface Sci., 268 (2), 273-287.

16- Driehaus, W., Jekel, M., and Hildebrandt, U. (1998). “Granular ferric hydroxide- a new adsorbent for the removal of arsenic from natural water.” Aqua- J. of Water Services Research and Technology, 47(1), 30-35.

17- Ayoob, S., Gupta, A.K., and Bhakat, P.B. (2007). “Analysis of breakthrough developments and modeling of fixed bed adsorption system for As(V) removal from water by modified calcined bauxite (MCB).” Separation and Purification Technology, 52 (3), 430-438.

18- Ayoob, S., Gupta, A. K., Bhakat, P. B., and Bhat, V.T. (2008). “Investigations on the kinetics and mechanisms of sorptive removal of fluoride from water using alumina cement granules.” J. of Chemical Engineering, 140(1),6-14.

19- Chidambaram, S., Ramanathan, A.L., and Vasudevan, S. (2003). “Fluoride removal studies in water using natural materials.” Water S. A., 29(3), 339-343.