Improvement of Hydraulic and Mixing Efficiency of Ozone Contact Tanks

Abstract

Disinfection costs of drinking water are increasing day by day due to urbanization, population growth and high energy use. Ozone is used as a pre-disinfection method for the disinfection of drinking water in some drinking water treatment plants in Turkey and becoming increasingly common in the world. It is expected that the disinfection process with ozone will become widespread in in the near future. In this study, the hydraulic and mixing efficiencies of the ozone contact tank in a drinking water treatment facility were evaluated by means of numerical simulations. The flow structure was first examined in detail based on the numerical simulation results from OpenFOAM open-source software. Then, Slot Baffle (SBD) and Porous Baffle (PBD) designs were implemented to the tank for the enhancement of hydraulic and mixing efficiencies. Eventually, the hydraulic and mixing efficiencies were assessed based on the tracer simulations for Conventional Baffle (CBD), SBD and PBD designs.

Keywords

• Ozone contact tank
• Drinking water treatment
• Hydraulic and mixing efficiencies

OZON TEMAS TANKLARININ HİDROLİK VE KARIŞIM VERİMLERİNİN İYİLEŞTİRİLMESİ

Abstract

İçme sularının dezenfeksiyon maliyetleri kentleşme, nüfus artışı ve yüksek enerji kullanımı nedeniyle her geçen gün artmaktadır. Ozon ile içme sularının dezenfeksiyonu ön dezenfeksiyon yöntemi olarak ülkemizde bazı içme suyu arıtma tesislerinde kullanılmakta olup Dünya’da giderek yaygınlaşmaktadır. Ülkemizde de yakın zamanda ozonla dezenfeksiyon sürecinin yaygınlaşacağı beklenmektedir. Bu çalışmada, bir içme suyu arıtma tesisinde bulunan ozon temas tankının hidrolik ve karışım verimleri sayısal benzetimler ile değerlendirilmiştir. OpenFOAM açık kaynak kodlu yazılımı kullanılarak gerçekleştirilen sayısal benzetimler ile öncelikle akım yapısı detaylı olarak incelenmiştir. Daha sonra, Üç Yarıklı Perde (ÜYP) ve Gözenekli Perde (GP) tasarımları tank içerisinde uygulanarak akım yapısındaki değişimler elde edilmiştir. Çalışmanın son bölümünde bozunmasız izleyici sayısal benzetimleri ile tankın hidrolik ve karışım verimleri Klasik Perde (KP), ÜYP ve GP tasarımları için ayrı ayrı değerlendirilerek tankın verim artışı değerlendirilmiştir.

Keywords

• Ozon temas tankı
• İçme suyu arıtma
• Hidrolik ve karışım verimleri

References

1. 1. Angeloudis, A., Stoesser, T., Falconer, R.A. ve Kim, D. (2015) Flow, transport and disinfection performance in small- and full-scale contact tanks, Journal of Hydro-Environment Research, 9(1), 15–27.
2. 2. Angeloudis, A., Stoesser, T., Gualtieri, C. ve Falconer, R.A. (2016) Contact tank design ımpact on process performance, Environmental Modeling & Assessment, 21(5), 563–576.
3. 3. Alzahrani, A., Ullah, M.Z., Alshomrani, A.S. ve Gul, T. (2021) Hybrid nanofluid flow in a Darcy-Forchheimer permeable medium over a flat plate due to solar radiation, Case Studies in Thermal Engineering, 26.
4. 4. Aral, M. M. ve Demirel, E. (2017) Novel slot-baffle design to ımprove mixing efficiency and reduce cost of disinfection in drinking water treatment, Journal of Environmental Engineering, 143(9), 1–5. 2017.
5. 5. Domaingo, A., Langmayr, D., Somogyi, B. ve Almbauer, R. (2016) A semi-implicit treatment of porous media in steady-state CFD, Transport in Porous Media, 112(2), 451–466.
6. 6. Farooq, U., Ahsan, M.I., Khan, M.I, Isa, S.S.P.M. ve Lu, D.C. (2020) Modeling and non-similar analysis for Darcy-Forchheimer-Brinkman model of Casson fluid in a porous media, International Communications in Heat and Mass Transfer, 119, 104955.
7. 7. Khan, M.I., Alzahrani, F. ve Hobiny, A. (2020) Simulation and modeling of second order velocity slip flow of micropolar ferrofluid with Darcy–Forchheimer porous medium, Journal of Materials Research and Technology, 9(4), 7335-7340.
8. 8. Kizilaslan, M. A., Demirel, E. ve Aral, M. M. (2018) Effect of porous baffles on the energy performance of contact tanks in water treatment, Water, 10(8), 1084. 2018.

9. 9. Kizilaslan, M. A., Demirel, E. ve Aral, M. M. (2019) Efficiency enhancement of chlorine contact tanks in water treatment plants: a full-scale application, Processes, 7(9), 551. 2019.
10. 10. Kizilaslan, M. A., Nasyrlayev, N., Kurumus, A. T., Savas, H., E. Demirel ve Aral, M. M. (2020) Experimental and numerical evaluation of a porous baffle design for contact tanks, Journal of Environmental Engineering, 146(7).
11. 11. Launder, B.E. ve Spalding, D.B. (1974) The numerical computation of turbulent flows, Comput.Methods in Appl.Mech.Eng, 3(2), 269-289.
12. 12. Nasyrlayev, N., Kizilaslan, M.A., Kurumus, A.T., Demirel, E. ve M. M. Aral (2020) A perforated baffle design to improve mixing in contact tanks, Water, 12(4), 1022. 13. Nasyrlayev, N. ve Demirel, E. (2022) Design optimization of the porous baffle in a disinfection contact tank for high efficiency, Urban Water Journal, 19(7).
13. 14. Niazi S., Kalbasi, M. ve Bahramian A. (2017) Hydraulic and disinfection efficiency of an ozonation contactor for a municipal water treatment plant using computational fluid Dynamics, Canadian Journal of Chemical Engineering, 95(11), 2063–2072.
14. 15. Rauen, W. B., Angeloudis, A. ve Falconer, R. A. (2012) Appraisal of chlorine contact tank modelling practices, Water Research, 46(18), 5834–5847.
15. 16. Stefano, G. M. D. (2014) Modeling thermal energy storage systems with Open∇FOAM, Doktora tezi, Politecnico di Milano, Italy.
16. 17. Teixeira, E.C. ve Siqueira, R. D. N. (2008) Performance assessment of hydraulic efficiency indexes, Journal of Environmental Engineering, 134(10), 851–859.
17. 18. US EPA, (2003). Disinfection profiling and benchmarking guidance manual. Appendix A Rep. No. EPA 816-R-03-004 EPA, United States Environmental Protection Agency.
18. 19. Xiong, F., Jiang, Y., Zhu, C., Teng, L., Cheng, H. ve Wang, Y. (2022). A Coupled Darcy-Forchheimer Flow Model in Fractured Porous Media, Applied Sciences, 13(1), 344.
19. 20. Yang, J., Li, J., Zhu, J., Dong, Z., Luo, F., Wang, Y., Liu, H., Jiang, C. ve Yuan, H. (2017) A novel design for an ozone contact reactor and its performance on hydrodynamics, disinfection, bromate formation and oxidation, Chemical Engineering Journal, 328, 207–214.