Numerical Study of Input of Primary Settling Tanks in Circular Wastewater Treatment Plants with Flow-3D

Document Type : Research Paper

Authors

1 PhD Student of Civil Engineering Department, University of Qom, Qom, Iran

2 Assistant Professor of Civil Engineering Department, Lahijan Branch, Islamic Azad University, Lahijan, Iran.

3 M.Sc. of Civil Engineering Department, Lahijan Branch, Islamic Azad University, Lahijan, Iran

Abstract

Water scarcity is one of the main challenges and constraints in the development of the country. On the other hand, wastewater treatment methods were initially developed as a response to concern about public health and the conditions caused by wastewater disposal in the environment, but now with the expansion of cities and urban life, keeping the environment clean and protecting it is essential for social life. Therefore, the aim of the research is to minimize the cost, optimize and simulate the primary sedimentation tanks in wastewater treatment plants using Flow3D software. In addition to evaluating the accuracy of the model in the simulation, parameters affecting the ratio of inlet through the overflow to the inlet under the valve were determined. The results showed that The Les model had better result in simulating the setting cavitiy in circular-shaped treatment plant tanks in comparison to the other turbulence models. Comparing the effect of settling characteristic parameters on the maximum settling depth, it was concluded that the drag coefficient and static angle parameters had a great effect on the it. According to several simulations performed with Flow3D software, it was found that this software has good accuracy in simulating the flow pattern passing through the circular overflow-valve treatment plant in both solid bed and mobile bed modes. Also, by comparing the effect of deposition characteristic parameters on the maximum deposition depth, it can be seen that the parameters of drag coefficient and static angle have a great effect on the amount of deposition. Also, among different turbulence models, LES model has more acceptable results in simulation. The settling of the refinery tanks indicates a circular Spillway-valve shape.

Keywords

References

 
منزوی، م.، (1384)، فاضلاب شهری (تصفیه فاضلاب)، انتشارات دانشگاه تهران، تهران، ایران.
عظیمی ساریخان بگلو، م.، و جباری، ا.، (1395)، "بهینه‎سازی آرایش ورودی مخازن‌ ته‎نشینی اولیه مستطیلی شکل در تصفیه‌خانه‌های فاضلاب با استفاده از نرم‌افزار FLOW-3D"، پایان نامه کارشناسی ارشد، دانشگاه قم، قم، ایران.
Anderson, N.E., (1945), “Design of final settling tanks for activated sludge”, Sewage Works Journal, 17 (4), 50-65.
Ashby, S.F., Manteuffel, T.A., and Saylor, P.E., (1990), “A taxonomy for conjugate gradient methods”, SIAM Journal on Numerical Analysis, 27(6), 1542-1568.
Aslam, M.T., Kainz, H., and Gruber, G., (2011), “Description of the settling behaviour of solidsin wastewater. In canal Management”, Journal of Civil Engineering and Urbanism, 225(2), 4-30.
Borna, M., Janfeshan A.H., Merufinia, E., and Asnaashari, A., (2014), “Numerical simulations of distribution and sediment transmission in pre-settled pools using Finite Volume Method and comparison with experimental results”, Journal of Civil Engineering and Urbanism, 4(3), 287-292.
Dobbins, W.E., (1994), “Effects of turbulence on sedimentation”, Transactions of ASCE, 10(9), 629-656.
Griborio, A.G., Rodríguez, J.A., Enriquez, L., and McCorquodale, J.A., (2021), “Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank”, Journal of Water Science Technology, 84(2), 333-348.
Patziger, M., (2021), “Improving wastewater treatment plant performance by applying CFD models for design and operation: Selected case studies”, Journal of Water Science Technology, 84 (2), 323-332.
Shahrokhi, M., Rostami, F., Said, M.A.M., and Sabbagh Yazdi, S.R., (2012), “The effect of number of baffles on the improvement efficiency of primary sedimentation tanks”, Journal of Applied Mathematical, 36(8), 3725-3735
Su, J., Wang, L., Zhang, Y., and Gu, Z., (2019), “A numerical study on influent flow rate variations in a secondary settling tank” , Processes, 7(12), 884.
Winter, M., and Breitsamter, Ch., (2016), “Efficient unsteady aerodynamic loads prediction based on nonlinear system identification and proper orthogonal decomposition”, Journal of Fluids and Structures, 67(2), 1-21.
Zanganeh, H., and Narakorn, S., (2016), “Three-dimensional VIV prediction model for a long flexible cylinder with axial dynamics and mean drag magnifications”, Journal of Fluids and Structures, 66(3), 127-146.
 
Journal of Water and Wastewater Science and Engineering
Volume 7, Issue 3
October 2022
Pages 53-71

Files

History

  • Receive Date: 29 October 2021
  • Revise Date: 16 April 2022
  • Accept Date: 03 May 2022

Share

How to cite

Statistics