Modelling wastewater transformation in sewers based on ASM3

Area of Science:

• Environmental Engineering
• Water Quality Modeling
• Wastewater Treatment

Background:

• Sewer systems are critical infrastructure for urban water management.
• Understanding wastewater transformations within sewers is essential for effective treatment and environmental protection.
• Existing models often lack detailed representation of biofilm activity and mass transfer processes.

Purpose of the Study:

• To develop a deterministic model for wastewater transformations in sewers.
• To incorporate sewer wall biofilm activity and mass transfer using the effectiveness approach.
• To calibrate and validate the model using laboratory and field experiments.

Main Methods:

• The model is based on the Activated Sludge Model No. 3 (ASM3).
• Mass transfer in the biofilm was modeled using the effectiveness approach for computational efficiency.
• Model parameters were calibrated and validated using laboratory experiments and field data from a main sewer.

Main Results:

• The developed model accurately describes oxygen concentration and wastewater respiration in sewers.
• The effectiveness approach for biofilm mass transfer proved efficient and yielded good results.
• The model successfully integrated parameters like wall roughness, particle attachment, and biofilm erosion.

Conclusions:

• The new deterministic sewer model provides a robust tool for simulating wastewater quality.
• The model's ability to be linked with other urban hydrology models enhances integrated water management.
• This research contributes to improved understanding and management of urban water systems.