Experimental and numerical studies on predicting and improving the full-scale wastewater treatment plant hydrodynamics

Şibil R., Aras E., Kankal M.

Desalination And Water Treatment, vol.237, pp.1-17, 2021 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 237
  • Publication Date: 2021
  • Doi Number: 10.5004/dwt.2021.27708
  • Title of Journal : Desalination And Water Treatment
  • Page Numbers: pp.1-17


treatment plant (WWTP), oxidation ditches (OD) hydrodynamics to design and develop the desired

flow conditions of the WWTP. Computational fluid dynamics (CFD) models were developed using

CFD software, ANSYS Fluent (V13) with the three-dimensional, steady, incompressible flow based

on the Reynolds-Averaged Navier-Stokes equations for flow field calculations in the combined ODs.

Also, three different turbulence models [standard k–ε (ske), renormalization group k–ε (RNG), and

realizable k–ε (real)] were performed for a comparative study. The numerical model was verified based

on the experimental data in the relative errors for ske, RNG, and real 13%, 17%, and 18%, respectively.

According to the parametric studies, the hydrodynamic characteristics of the existing WWTP

were investigated. The maximum wastewater velocity occurred at the inlet and outlet, affecting the

flow field in ODs. Moreover, the water velocity decreased as it moved away from the inlet and outlet

locations at vertical and horizontal. It can also be noted that there was no homogeneous flow field

distribution in ODs. Because the current OD model needs improvement hydrodynamically, a new

original OD geometry was presented to eliminate the hydraulic weakness of existing WWTP by CFD

analysis. The new original geometry provides a more homogeneous flow field in ODs that mean it will

also help treatment efficiency and energy saving according to the operating principles of this facility.