کاربرد روش سطح پاسخ برای مدل‌سازی و بهینه‌سازی فرایند انعقاد در حذف یون بروماید

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی شیمی، دانشگاه محقق اردبیلی

2 استادیار گروه مهندسی شیمی، دانشگاه محقق اردبیلی

چکیده

در این پژوهش با استفاده از روش سطح پاسخ و طراحی مرکب مرکزی، کارایی فرایند انعقاد در حذف یون بروماید، مدل‌سازی و بهینه‌سازی شد. یون بروماید در آب‌های سطحی به‌طور طبیعی یافت می‌شود و علی‌رغم غیرسمی بودن آن، این یون در برخورد با گندزداهای رایج تصفیه آب، باعث تولید محصولات جانبی گندزدایی با سرطان‌زایی بیشتر نسبت به ‌نوع کلرینه آنها می‌شود. فرایند انعقاد در تصفیه‌خانه‌های آب، به‌عنوان یک قسمت کلیدی تلقی می‌شود. انعقاد پیشرفته که به‌تازگی با کمک منعقد کننده‌های جدیدی با عنوان منعقد کننده‌های پلیمری معدنی، توانایی قابل ‌توجهی در حذف کدورت و انعقاد ذرات کلوئیدی و کاهش پتانسیل زتا دارند، در پژوهش‌ها مورد توجه قرار گرفته‌اند. منعقد کننده استفاده شده در این سری آزمایش‌ها، پلی‌آلومینیوم‌کلراید بود. با استفاده از طراحی آزمایشی که توسط نرم‌افزار دیزاین اکسپرت انجام شد، مدل بسیار خوبی با  ضریب رگرسیونی برابر 9925/0 به اطلاعات حاصل از مشاهدات تجربی در راندمان حذف بروماید فیت شد. پارامترهای غلظت اولیه بروماید و دز منعقد کننده، تأثیر مستقیمی بر راندمان حذف یون بروماید داشت؛ ولی برای pHرفتار متفاوتی مشاهد شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Application of Response Surface Methodology (RSM) for Modeling and Optimizing Coagulation Process for the Removal of Bromide Ions

نویسندگان [English]

  • Mohammad Abdollahpour 1
  • keivan shayesteh 2
1 MSc Student in Chemical Engineering, Mohaghegh-e-Ardabili University, Ardabil
2 Ass. Prof. of Chemical Engineering, Mohaghegh-e-Ardabili University, Ardabil
چکیده [English]

In this paper, the response surface methodology and the central composite design are used to model and optimize bromide removal efficiency in the coagulation process. Bromide ions are naturally found in surface waters. Despite its non-toxicity, when exposed to disinfectants commonly used in water treatment, bromide ions produce disinfection byproducts which are more carcinogenic than their chlorinated counterparts. A key process in water treatment is coagulation. Most studies have recently focused on enhanced coagulation achieved by new coagulants known as inorganic polymer coagulants which exhibit a remarkable ability in both removing colloidal particles and reducing turbidity and the zeta potential from water. In the present experiments, poly-aluminum chloride (PAC) is used as a coagulant. Moreover, an experimental design is constructed using the Design-Expert software to develop an efficient model with a regression coefficient of 0.9925 which fitted the observed data on bromide removal efficiency. It is found that coagulant dosage and initial bromide concentration have direct impacts on bromide removal efficiency while a different behavior is observed in the case of pH.

کلیدواژه‌ها [English]

  • Response Surface Methodology
  • Central composite design
  • Enhanced coagulation
  • Bromide Ion
  • Poly-Aluminum Chloride
1. Zhang, Y.J., Zhou, L.L., Zeng, G., Song Z.G., and Li, G.B. (2010). “Factors affecting the formation of trihalomethanes in the presence of bromide during chloramination”. J. of Appl. Phys. and Eng., 11(8),
606-61.

2. Rizzo, L., Belgiomo, V., and Gallo, M.S. (2005). “Removal of THM precursors from a high-alkaline surface water by enhanced coagulation and behavior of THMFP toxicity.” J. of Desalination, 176, 177-188.

3. Echigo, S., Itoh, S., and Kuwahara, M. (2007). “Bromide removal by hydrotalcite-like compounds in a continuous system”. J. of Water Science and Technology, 56, 117-122.

4. Camel, V., and Bermond, A. (1998). “The use of ozone and associated oxidation processes in drinking water treatment.” J. of Water Research, 32(11), 3208-3222.

5. Shukairy, H.M., Miltner, R.J., and Summers, R.S. (1995). “Bromide’s effect on DBP formation, speciation, and control, part 2, Biotreatment”. J. of Water Wks. Assoc., 87(10), 71-82.

6. Liu, S., Zhu, Z., Qiu, Y., and Zhao, J. (2011). “Effect of ferric and bromide ions on the formation and speciation of disinfection byproducts during chlorination”. J. of Environmental Sciences, 23(5), 765-772.

7. US. Environmental Protection Agency (USEPA). (1998). Disinfectants and disinfectants by-products: final rule, Federal Register, 63(24), 69478.

8. WHO. (1990). IARC monographs on the evaluation of carcinogenic risks to humans, World Health Organization, Geneva.

9. Watson, K., Farré, M.J., and Knight, N. (2012). “Review strategies for the removal of halides from drinking water sources, and their applicability in disinfection by-product minimization.” J. of Environmental Management, 110, 276-298.

10. Shi, B., Li, G., Wang, D., Feng, C., and Tang, H. (2007). “Removal of direct dyes by coagulation: The performance of preformed polymeric aluminum species.” J. of Hazard. Mater., 143, 567-574.

11. Wang, D., Sun, W., Xu, Y., Tang, H., and Gregory, J. (2004). “Speciation stability of inorganic polymer flocculant-PACl.” J. of Colloids Surf. A: Physicochem. Eng. Aspects, 243, 1-10.

12. Jiang, J. Q. (2001). “Development of coagulation theory and prepolymerized coagulants for water Treatment.” J. of Separation and Purification Methods, 30, 127-142.

13. Ye, C., Wang, D., Shi, B., Yu, J., Qu, J., Edwards, M., and Tang, H. (2007). “Alkalinity effect of Coagulation with polyaluminum chlorides: Role of electrostatic patch.” J. of Colloids Surf. A: Physicochem. Eng. Aspects, 294,163-173.

14. Ge, F., Shu, H., and Dai, Y. (2007). “Removal of bromide by aluminum chloride coagulant in the presence of humic acid”. J. of Hazard. Mater., 147, 457-462.

15. Gunten, U.V. (2003). “Review ozonation of drinking water Part II disinfection and by-product formation in presence of bromide, iodide or chlorine.” J. of Water Research, 37, 1469-1487.

16. Omelia, C.R., and Shin, J.Y. (2001). “Removal of particle using dual media filtration modeling and experimental studies.” J. of Water Supply, IWA., 1(4), 73-79.

17. Eric, H., and Kara, H. (2002). Optimizing coagulant conditions for the Worcester water filtration plants,A Major Qualifying Project Report Submitted to the Faculty of Worcester Polytechnic Institute, USA.

18. Malhutra, S. (1994). “Polyaluminum chloride as an alternative coagulant.” Proc. 20th WEDC Conference Colombo, Sri Lanka.

19. Tang, H.X., and Luan, Z.K. (1995). “Features and mechanism for coagulation flocculation process of polyaluminum chloride.” J. of Environ. Sci., 7(2), 204-211.

20. Luan, Z.K. (1997). “Theory and application of inorganic polymer flocculant-polyaluminium chloride.” Doctoral Dissertation, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing.

21. Liu, W., Huang, H., and Peng, J. (2001). Application of polyaluminum chloride in Shenzhen water supply, Qingyouan Water Purification Water Supply Group Ltd., Shenzhen, China.

22. Ge, F., and Zhu, L., (2008). “Effects of coexisting anions on removal of bromide in drinking water by coagulation.” J. of Hazard. Mater., 151, 676-681.

23. Piepel, G., Anderson, C.M., and Redgate, P.E. (1993). “Response surface designs for irregularly-shaped regions.” Proc. of the Section on Physical and Engineering Sciences, American Statistical Association, Alexandria, Virginia, 205-227.

24. Aslan, N., and Cebeci, Y. (2007). “Application of box-behnken design and response surface methodology for modeling of some Turkish coals.” J. of Fuel, 86, 90-97.