Towards a generalized physicochemical framework.

Area of Science:

• Environmental Engineering
• Water Treatment
• Chemical Engineering

Background:

• Wastewater treatment models traditionally focus on biokinetic conversions.
• Abiotic processes like acid-base reactions, precipitation, and redox reactions fundamentally influence plant performance.
• Existing models often omit crucial physicochemical corrections, limiting their accuracy.

Purpose of the Study:

• To highlight the need for a physicochemical framework in wastewater treatment modeling.
• To review available knowledge and fundamental approaches for integrating abiotic processes.
• To guide research efforts towards developing comprehensive whole-plant process models.

Main Methods:

• Literature review of physicochemical processes in wastewater.
• Analysis of existing wastewater treatment models (e.g., International Water Association models).
• Identification of knowledge gaps and research needs for physicochemical modeling.

Main Results:

• Abiotic processes (ionization, precipitation, redox) significantly affect pH, gas transfer, and biokinetics.
• Current biological process models are limited by the omission of non-ideal acid-base behavior and ion precipitation.
• Fundamental chemistry is understood, but its application in wastewater treatment modeling requires further development.

Conclusions:

• A dedicated physicochemical framework is essential for accurate whole-plant wastewater treatment modeling.
• Further research, including experimental and model development, is needed to bridge the gap between fundamental chemistry and wastewater applications.
• Integrating abiotic factors will enhance the design and optimization of wastewater treatment plants.