Pilot-scale UV/H2O2 study for emerging organic contaminants decomposition.

Area of Science:

• Environmental Chemistry
• Water Treatment Technologies
• Environmental Science

Background:

• Emerging organic contaminants (EOCs) are increasingly detected in water due to human activities and advanced analytical methods.
• EOCs pose risks to ecological and human health even at low concentrations.
• Conventional water treatment often fails to remove these recalcitrant compounds.

Purpose of the Study:

• To evaluate the efficiency of pilot-scale UV/H2O2 Advanced Oxidation Process (AOP) for removing diverse emerging contaminants.
• To investigate the decomposition kinetics and influencing factors of UV/H2O2 AOP.
• To assess the impact of water quality on UV-based treatment efficacy.

Main Methods:

• Pilot-scale UV/H2O2 oxidation experiments were conducted.
• Decomposition efficiency was assessed for endocrine-disrupting chemicals (EDCs), pharmaceuticals and personal care products (PPCPs), taste and odor (T&O) compounds, and perfluorinated compounds.
• Kinetic studies analyzed light absorption and quantum yield.
• Treated water quality parameters were analyzed.

Main Results:

• UV/H2O2 AOP demonstrated high efficiency in removing EDCs, PPCPs, and T&O compounds.
• Perfluorinated compounds were not effectively removed by the tested UV/H2O2 AOP.
• Decomposition rates were influenced by compound-specific light absorption and quantum yield.
• Feed water quality significantly impacted UV photolysis and UV/H2O2 treatment outcomes.

Conclusions:

• UV/H2O2 AOP is a viable treatment for many emerging contaminants, excluding perfluorinated compounds.
• Understanding reaction kinetics and water matrix effects is crucial for optimizing UV-based water treatment.
• Further research is needed for effective removal of recalcitrant contaminants like perfluorinated compounds.