One- and Three-Dimensional Computational Fluid Dynamics Model Comparison of the Treatment Performance of a Full-Scale Oxidation Ditch


Pierre K. C. , Tejada-Martínez A. E. , PIRASACI T., Perez A., Sunol A.

Journal of Environmental Engineering (United States), vol.148, no.9, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 148 Issue: 9
  • Publication Date: 2022
  • Doi Number: 10.1061/(asce)ee.1943-7870.0002021
  • Journal Name: Journal of Environmental Engineering (United States)
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, Business Source Elite, Business Source Premier, CAB Abstracts, Chemical Abstracts Core, Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, Geobase, Greenfile, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, DIALNET, Civil Engineering Abstracts
  • Gazi University Affiliated: Yes

Abstract

© 2022 American Society of Civil Engineers.This work developed three computational fluid dynamics (CFD) models of a full-scale oxidation ditch, one three-dimensional (3D) model and two one-dimensional (1D) models, to compare their predicted wastewater treatment performance. The models incorporated biokinetics through the Activated Sludge Model 1 (ASM-1) to predict the treatment performance of the ditch based on concentrations of pollutants: readily biodegradable substrate (SS), soluble ammonium ammonia nitrogen (SNH), and soluble nitrate nitrite nitrogen (SNO). When comparing the time series of the concentration of ASM-1 pollutants averaged over the ditch for 40 days, all three models displayed similar trends with slight differences in steady-state values, except for SNO. The steady-state value of SNO was greater by more than 150% for the 1D model than the 3D model. This difference is attributed to spatial heterogeneities in dissolved oxygen concentration predicted by the 3D model that were not captured by the 1D model, leading the latter to underpredict the denitrification process. Specifically, the spiraling flow around the aerators that plays an important role in determining the spatial distribution of dissolved oxygen cannot be represented in the 1D model.