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Effects of variable feeds in wastewater plants by means of process simulation

Samaka, Abdelhalim (2021)

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Diplomityö

Samaka, Abdelhalim
2021

School of Engineering Science, Kemiantekniikka

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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2021070140707

Tiivistelmä

Literature review of wastewater plants
Process simulation of wastewater processes
- First simulations are roughly models of unit operations.
- The models can be furthermore detailed if needed.
- Several different scenarios are simulated.
- Results are analysed based on the plant operation characteristics.
Outline
In this study different feed conditions are simulated by solving steady-state mass and energy balance equations using SteadyState process simulation tool. The minimum and maximum values of feed stream parameters are used in simulations which were designed to correspond extreme weather conditions. The simulation results are used for describing process sensitivity and thus the process behaviour is better understood at limiting conditions. The combined effects of feed stream parameters can also be studied efficiently to the parameters describing process operation. Also, the 3 effect to each process units can be clarified which may give valuable information for corrective and preventing actions in this kind of extreme weather conditions.

The main findings are the wastewater process unit level results. A large group of simulations are produced in order to find the effluent concentration of contaminant as Nitrogen or Ammonia.

Wastewater plant units, such as pre-clarification, denitrification and chemical additions have operational design specifications like for example designed tank volumes or designed feed concentrations which may not be exceeded. Thus, it is possible to control circulation streams, chemical amounts and construct additional buffer tanks based on this kind of process simulation results analysis.
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