Activated sludge pilot plant: comparison between experimental and predicted concentration profiles using three...

Area of Science:

• Environmental Engineering
• Wastewater Treatment
• Bioprocess Engineering

Background:

• Activated sludge processes are crucial for wastewater treatment.
• Accurate modeling is essential for optimizing reactor design and performance.
• Existing kinetic models may not fully capture complex biological and chemical interactions.

Purpose of the Study:

• To experimentally and numerically investigate an activated sludge channel pilot plant.
• To compare the simulation accuracy of systemic, CFD, and compartmental modeling approaches using the ASM-1 kinetics model.
• To identify limitations in current modeling strategies for activated sludge systems.

Main Methods:

• Experimental measurements of oxygen, COD, nitrate, and ammonium profiles in a pilot plant.
• Numerical simulations using systemic, computational fluid dynamics (CFD), and compartmental modeling.
• Application of the Activated Sludge Model No. 1 (ASM-1) for all kinetic simulations.

Main Results:

• All three modeling approaches reasonably simulated oxygen, COD, and nitrate profiles.
• Simulations for ammonium (NH4) concentration profiles significantly deviated from experimental data.
• The choice and parameterization of the kinetics model critically impact simulation accuracy.

Conclusions:

• The Activated Sludge Model No. 1 (ASM-1) requires careful parameterization for accurate predictions.
• Current kinetic parameters, often optimized using systemic models, limit the reliability of local concentration predictions.
• Improved kinetics models and parameterization methods are needed for precise design of activated sludge reactors.