Exjobbsförslag våren 2021: Faktorer som korrelerar till störningar av bio-P-processen på avloppsreningsverk

Master’s thesis proposal spring 2021
Factors effecting enhanced biological phosphorus removal upsets at wastewater treatment plants


Enhanced biological phosphorus removal (EBPR) at wastewater treatment plants (WWTPs) has been recognised as the most sustainable process to remove phosphorus from municipal WWTPs. However, EBPR processes often experience fluctuant performance or unpredicted upsets due to weak influent carbon levels, excessive nitrate loading, nutrient limitation, hydraulic shocks and toxicity.

NSVA (Nordvästra Skånes Vatten och Avlopp AB) operates the water and wastewater works in seven municipalities in northwestern Scania. The two largest WWTPs are operating the EBPR process. Sometimes the operators observes unexpected upsets of the EBPR process. There is a need to explain the reasons of these upsets to be able to cope with even more stringent effluent phosphorus standards in the future.


The objective of this project is to evaluate which and how environmental and operating conditions as well as wastewater characteristics may generate EBPR upsets in the full-scale WWTPs in this study.


Statistical analyses, such as multiple linear regression, will be used to correlate many different operational and environmental factors with periods of upsets of the EBPR process. Data from the Lundåkra and/or Öresund WWTPs is used in the study.


Spring 2021

Interested to perform this Master´s thesis?

Contact the one of the supervisors for the project.
Oskar Modin, professor, Chalmers University of Technology (oskar.modin@chalmers.se)
David Gustavsson, research leader, Sweden Water Research (david.gustavsson@vasyd.se)
Maja Ignell, process engineer, NSVA (maja.ignell@nsva.se)