Exjobbsförslag hösten 2020: Partiell denitrifikation kombinerat med anammox



Municipal wastewater treatment plants possess the capacity to be energy-positive through allocation of organic carbon to biogas production. This is, however, in direct conflict with the need of readily available organic carbon source in the traditional biological nutrient removal (BNR) processes. The anaerobic ammonium oxidation (anammox) process is autotrophic, but dependent of a nitrite provider. Inhibition of nitrite oxidising bacteria (NOB) have shown to be difficult in cold and weak municipal wastewaters. Instead, heterotrophic partial denitrification seems to be a better nitrite provider.

Partial denitrification coupled to anammox (PDA) is a novel process and only one study has investigated fermented sludge as a carbon source for the PDA process. The PDA process coupled with preceding partial nitrification has the potential of decreasing the aeration need up to 50% and organic carbon need up to 80% compared to conventional nitrification-denitrification.

VA SYD is a municipal joint authority, operating several wastewater treatment plants (WWTPs) in southern Sweden. VA SYD and its R&D company Sweden Water Research want to explore the possibilities implementing the PDA process in the next generation of wastewater treatment plants.


The main objectives of this project are (i) to study the start-up of a one-stage PDA biofilm process, and (ii) to study the boundary conditions of a successful PDA process.


Two parallel lab-scale reactors with biofilm carriers are feed with a synthetic wastewater containing ammonium, nitrate and acetate.


Autumn 2020

Interested to perform this Master´s thesis?

Contact the one of the supervisors for the project.

  • David Gustavsson, Research Leader, VA SYD/Sweden Water Research (david.gustavsson@vasyd.se)
  • Per Falås, Post-doc, Lund University (per.falas@chemeng.lth.se)