Response surface methodology (RSM) for optimizing ozone-assisted process parameters for formaldehyde removal

Area of Science:

• Environmental Chemistry
• Plasma Science
• Chemical Engineering

Background:

• Formaldehyde (HCHO) is a significant gaseous pollutant from commercial cooking operations.
• Volatile organic compounds (VOCs) like formaldehyde impact indoor air quality and pose health risks.

Purpose of the Study:

• To evaluate an ozone-assisted indirect plasma method for formaldehyde removal.
• To optimize operating conditions for formaldehyde removal efficiency and energy yield using response surface methodology (RSM).

Main Methods:

• Utilized a laboratory-scale dielectric barrier discharge (DBD) reactor for ozone generation.
• Employed response surface methodology (RSM) to analyze formaldehyde removal efficiency and energy yield.
• Investigated the impact of inlet formaldehyde concentration, ozone concentration, and residence time.

Main Results:

• Optimized models demonstrated a strong correlation between predicted and experimental outcomes.
• Inlet ozone concentration was the most significant factor influencing formaldehyde removal efficiency.
• Achieved up to 100% formaldehyde removal efficiency with an energy yield of 0.7 g/kWh under optimal conditions.

Conclusions:

• Ozone-assisted indirect plasma treatment is an effective method for formaldehyde removal in commercial kitchens.
• The process offers a viable alternative to existing air purification technologies.
• Prioritizing either removal efficiency or energy yield allows for tailored optimization of operating conditions.