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Publicerad 2017-12-14

Om uppdragsgivaren
Conventional nitrogen removal in wastewater treatment plants WWTPs is done via nitrification/denitrification, which is a biological process through which nitrogen is converted from ammonium to nitrogen gas. This wastewater treatment method has limits, such as a need for an external carbon source eg. methanol. In addition, in comparison to other ways to remove nitrogen, this method consumes high levels of energy, mainly due to the demand of aeration needed in order to provide enough oxygen for the process to be successful Star 2008. An alternative to nitrification/denitrification that has been recently discovered is a process called anammox an acronym for anaerobic ammonium oxidation. Its benefits in comparison to nitrification/denitrification include: 1 it is not dependent on an external carbon source, 2 less aeration is needed, and 3 subsequently, it lowers the energy cost required for the wastewater treatment process.

State of the art:
At Bromma WWTP in Stockholm, a so-called ANITA Mox MBBR Moving Bed Biofilm Reactor process was put into operation during 2017. This is a single stage deammonification technology able to remove up to 90% of the total nitrogen in sludge liquors from the anaerobic digestion. A mathematical model of the process has been implemented to validate results of nitrous oxide N2O gas emissions from different treatment process see Lindblom et al. 2016. Further model calibration and sensitivity analysis has been carried out recently Jonfelt, 2016. The model is implemented in Matlab/Simulink, where no dependency on temperature and pH is included, and assuming a simple PID for the air injection.

Beskrivning av examensarbetet
- Modify the existing mathematical model to include the dependency on the temperature mechanistically and pH empirically.
- Model calibration.
- Model the implemented rule-based control strategy for reject water feed and aeration.
- Design a user-friendly interface applicable for plant personnel to learn the process.

The experimental data from Bromma WWTP will be used to perform any of the above-mentioned options.

Expected results
- Thesis writing and presentation
- Participation in the writing of scientific conference or journal paper

Practical information
Group size: 1-2 students / Credits: 30hp / Duration: 20 weeks

Desirable profile:
The students should have experience in modelling and simulation in Matlab/Simulink platform.

Erik Lindblom / Jesús Zambrano /


Stockholm vatten och avfall / Mälardalen University


Sista ansökningdag

Dynamic modelling of
An evaluation of a M

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