Year 2023

• The coexistence and competition of canonical and comammox nitrite oxidizing bacteria in a nitrifying activated sludge system – Experimental observations and simulation studies

  Publication

  • J. Mąkinia
  • M. Mehrani
  • P. Kowal
  • D. Sobotka
  • M. Godzieba
  • S. Ciesielski
  • J. Guo

  - SCIENCE OF THE TOTAL ENVIRONMENT - Year 2023

  The second step of nitrification can be mediated by nitrite oxidizing bacteria (NOB), i.e. Nitrospira and Nitrobacter, with different characteristics in terms of the r/K theory. In this study, an activated sludge model was developed to account for competition between two groups of canonical NOB and comammox bacteria. Heterotrophic denitrification on soluble microbial products was also incorporated into the model. Four 5-week washout...

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Year 2022

• New insights into modeling two-step nitrification in activated sludge systems – The effects of initial biomass concentrations, comammox and heterotrophic activities

  Publication

  • M. Mehrani
  • D. Sobotka
  • P. Kowal
  • J. Guo
  • J. Mąkinia

  - SCIENCE OF THE TOTAL ENVIRONMENT - Year 2022

  In this study, the conventional two-step nitrification model was extended with complete ammonia oxidation (comammox) and heterotrophic denitrification on soluble microbial products. The data for model calibration/validation were collected at four long-term washout experiments when the solid retention time (SRT) and hydraulic retention time (HRT) were progressively reduced from 4 d to 1 d, with mixed liquor suspended solids (MLSS)...

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