Design of Wastewater Treatment Plant





Offered by

Supply Engineering




Main purpose

Through information retrieval, discussions and presentations to provide student with knowledge in planning establishment and design a proper waste water treatment plant (WWTP) for achieving a current wastewater quality.


- Knowledge of designing basic treatment facilities in order to remove grease and oil, sand and gravel, suspended solids, organic matter and ammonia.
- Establishing of a simple flow diagram and understanding of the internal relations between functions.
- Knowledge of hydraulic demands within the individual cleaning functions as well as the whole plant.
- Composition of wastewater and its significance in wastewater treatment.
- Recognition of wastewater cleaning methods related to the different wastewater treatment methods.
- Ability to find the right design of WWTP according to the actual outlet demands.
- Possible cleaning achievement from the different treatment methods and systems.
- The impact on the biological process from outside factors.


- Able to design a mechanical – chemical and biological WWTP
- Dimensioning of the screens
- Volume calculation of sand and grease trap
- Volume calculation of primary settlement tank
- Volume calculation of biological tank with nitrification, denitrification and phosphorus removal 
- Volume calculation of secondary settlement tank
- Estimation of oxygen demands


- Comparing different treatment systems and able to choose the right one for the actual case.
- Characterize different treatment methods with respect to physical, chemical and microbiological parameters.
- Use optimal hydraulic design in order to avoid unwanted settlement within the system.
- Analyze a specific wastewater flow and outlet demands in order to establish the necessary treatment plant.
- Explain the design criteria from an environmental point of view, create a flow diagram, and plan drawing of the WWTP according to this.
- Analyze a situation with inefficient treatment and find a way of improving this using learned treatment methods and skills.


Teaching methods and study activities

Individual information retrieval, data analysis, report writing, discussions in groups assisted by the lecturer, presentations, self-study, homework assignments.

137.5 hours of work for the student.

- Design mechanical – chemical processes in order to achieve the requested outlet demands.
- Dimensioning and designing of a wastewater plant with nitrification.
- Dimensioning and designing of a wastewater plant with denitrification.
- Dimensioning and designing of a wastewater plant with biological phosphor removal.
- Estimation of oxygen consumption and aeration systems.
- Understand principles of optimized constructions concerning energy consumption and impact from weather conditions.
- Hydraulic function and interaction within the separate functions as well as in the entire plant.


Notes from Ernst S. Hjorth, 2020. Wastewater treatment plants,

Mogens Henze, Poul Harremoës, Jes la Cour Jansen and Eric Arvin: Wastewater Treatment, Springer, 2000




Exam prerequisites:

Type of exam:
Ongoing tests in the form of one presentation, weighing 30% and one written assignment, weighing 70%.​
All assignments must be handed in before deadline..
Internal assessment. 

Tools allowed:

Equal to the ordinary assessment (new assignments).​

Grading criteria

Grading based on the Danish 7 point scale

Additional information


Agnieszka Behrend

Valid from

2/1/2024 12:00:00 AM

Course type


Wastewater treatment methods, wastewater treatment plant, volume calculation, full scale design, screen, sand trap, process tank, settler, activated sludge plant, biological treatment, mechanical treatment, oxygen demands