Modelling and Control of Nitrogen and Phosphorus Removing Systems

Modelling and Control of Nitrogen and Phosphorus Removing Systems

Borja Valverde-Pérez (Technical University of Denmark, Denmark), Xavier Flores-Alsina (Technical University of Denmark, Denmark), Anna Katrine Vangsgaard (Krüger Veolia, Denmark) and Miguel Mauricio-Iglesias (Universidade de Santiago de Compostela, Spain)
DOI: 10.4018/978-1-5225-1037-6.ch007
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A wide variety of technologies addressing nutrient removal in wastewater treatment have been developed in the latest years. In order to be able to design, manage, operate, optimise and benchmark these novel technologies with potentially existing standard technologies, detailed modelling of nutrient removal becomes essential. Nutrient removal is prominently considered, with different degrees of complexity, in the commonly used Activated Sludge Models (ASM). However, the description of nutrient-related compounds in these standard models is not sufficiently detailed for novel and not so novel technologies. Furthermore, the environmental evaluation of a process, which includes an estimation of the greenhouse gas release, would require a more complex process to represent nitrogen removal. This chapter reviews the current state of nutrient removal modelling, with special focus on the needs created by emerging technologies in nitrogen and phosphorus removal, paying special attention to the objectives that must be evaluated for each technology.
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Models For Nitrogen Removal

Nitrogen removal processes have been largely dominated by nitrification-denitrification processes which are properly described with the ASM models. In the last twenty years, the development of new autotrophic nitrogen removal processes led to the parallel creation of new models thereof. Additionally, increasing environmental concerns have increased the attention to models that include the production of N2O and other intermediates of nitrification and denitrification processes in order to mitigate its release.

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