Multiple Roles of Dissolved Organic Matter in Advanced Oxidation Processes

Area of Science:

• Environmental Chemistry
• Water Treatment Technologies

Background:

• Advanced oxidation processes (AOPs) are crucial for degrading trace organic contaminants (TrOCs) in water.
• Dissolved organic matter (DOM) is a prevalent water matrix component that influences AOP efficacy.
• DOM's complex interactions with AOPs can inhibit contaminant degradation or enhance radical formation.

Purpose of the Study:

• To critically review the multifaceted impacts of DOM on AOPs for water purification.
• To analyze how DOM's characteristics influence TrOC degradation and byproduct formation.
• To identify research needs for optimizing AOPs by leveraging DOM properties.

Main Methods:

• Literature review and critical analysis of existing research on DOM-AOP interactions.
• Examination of DOM's structural, optical, and redox properties in relation to AOP performance.
• Analysis of DOM's role in radical scavenging, light attenuation, and transformation pathways.

Main Results:

• DOM can inhibit TrOC degradation by scavenging radicals and blocking light.
• DOM can also enhance contaminant elimination by promoting radical formation and altering transformation pathways.
• AOPs modify DOM structure and influence the formation and types of oxidation byproducts.

Conclusions:

• DOM's impact on AOPs is complex, presenting both challenges and opportunities for water treatment.
• Understanding DOM's dual role is essential for designing effective and efficient AOPs.
• Further research is needed to exploit DOM's properties for improved oxidative water purification.