A kinetic model for multicomponent wastewater substrate removal by partial ozonation and subsequent biodegradation

Area of Science:

• Environmental Chemistry
• Chemical Engineering
• Water Treatment Technologies

Background:

• Partial ozonation is a key process for removing organic pollutants from water.
• Understanding the kinetics of multicomponent substrate removal is crucial for process optimization.
• Existing models may not fully capture the complexities of ozonation with biodegradation.

Purpose of the Study:

• To develop and validate a kinetic model for multicomponent substrate removal during partial ozonation.
• To investigate the impact of intermittent biodegradation on ozonation kinetics and efficiency.
• To compare the effectiveness of conventional partial ozonation with intermittent biodegradation processes.

Main Methods:

• Development of a kinetic model incorporating chemical oxygen demand (COD) and biochemical oxygen demand (BOD) co-evolution.
• Inclusion of a mass transfer component to describe ozone dosage over time.
• Application of a multiple zero-order reaction concept for multicomponent kinetic behavior.
• Experimental verification comparing conventional partial ozonation with intermittent biodegradation.

Main Results:

• The developed kinetic model effectively describes changes in stoichiometry and reaction rates during ozonation.
• Intermittent biodegradation was found to have no impact on the instantaneous stoichiometric ratio or ozone reaction rate.
• The model accurately predicts substrate removal and ozone consumption.

Conclusions:

• The kinetic model provides a robust framework for understanding and optimizing partial ozonation processes.
• Intermittent biodegradation offers significant advantages, leading to reduced ozonation time and ozone demand.
• This approach enhances the efficiency and cost-effectiveness of water treatment using ozonation.