Effects of Influent Substrate Concentration on the Performance and Kinetics of Anammox in a Bio-sand Filter

Authors

  • Jiao Chen School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, Sichuan, 611730, China
  • Rui Li School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, Sichuan, 611730, China
  • Yuqiao Deng School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, Sichuan, 611730, China
  • Xinyu Luo School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, Sichuan, 611730, China
  • Jingxiang Fan School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, Sichuan, 611730, China
  • Yixin Lu School of Materials and Environmental Engineering, Chengdu Technological University, Chengdu, Sichuan, 611730, China

DOI:

https://doi.org/10.54691/jwafbx64

Keywords:

Substrate Concentration; Bio-sand Filter; Anammox; Kinetics; Mathematical Model.

Abstract

A bio-sand filter was used to investigate the effects of influent substrate concentration (NH4+-N and NO2--N) on the performance of anaerobic ammonium oxidation (anammox), and a nitrogen removal kinetic model for anammox was developed. At a constant hydraulic loading rate of 1.0 m/d and an influent NO2--N/NH4+-N concentration ratio of 1.3, along-the-column water quality analysis showed that the apparent removal rate constants of both NH4+-N and NO2--N decreased with increasing influent substrate concentration, indicating that the substrate mass-transfer driving force was relatively sufficient at low substrate concentrations and that the substrate removal rate per unit biofilm area was higher. The removal kinetic models obtained by fitting were as follows: Sh/S0=exp(-0.6244S0-0.714h) for NH4+-N and Sh/S0=exp(-0.7633S0-0.7178h) for NO2--N. The average relative errors between the calculated and measured values were below 10%. The model can be used for effluent quality prediction and filter bed height control, providing a theoretical basis for the design and operational regulation of anammox bio-sand filter processes.

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Published

2026-10-21

Issue

Vol. 8 No. 10 (2026)

Section

Articles

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