Corona Discharge Ozone Treatment Solutions and Engineering Practice Guidelines

Corona Ozone Should Be Treated by Ambient-Temperature Catalytic Decomposition

In corona discharge processes, ozone concentration is typically in the range of 1–50 ppm, but with large airflow and continuous operation. Under these conditions, ambient-temperature ozone catalytic decomposition is more suitable for long-term stable operation than adsorption or thermal decomposition methods. It avoids high energy consumption and secondary pollution, making it especially suitable for continuous workshop-level treatment.

Mechanism of Ozone Generation in Corona Discharge

Under high voltage, corona discharge ionizes air. Oxygen molecules are split into reactive oxygen atoms in a strong electric field, which then combine with oxygen molecules to form ozone (O₃). The more concentrated the discharge region, the higher the voltage, and the greater the air participation, the higher the ozone generation. This process is common in corona treatment, electrostatic precipitation, plasma surface treatment, and similar equipment, and is difficult to eliminate through process optimization alone.

Practical Engineering Hazards of Ozone in Corona Workshops

In workshop environments, the long-term presence of low concentrations of ozone can lead to significant engineering issues:

1. Accelerates aging of rubber seals and cable insulation
2. Corrodes metal surfaces and electrical contacts
3. Irritates the respiratory system of operators
4. Affects the stability of precision electronic equipment

Mainstream Industrial Ozone Treatment Methods Comparison

Corona workshops are typically characterized by low concentration + large airflow + continuous operation, where the first two methods struggle to maintain long-term stability.

Reaction Mechanism and Engineering Characteristics of Ozone Catalytic Decomposition

Ozone undergoes the following reaction on the catalyst surface:
> 2O₃ → 3O₂
This reaction can proceed rapidly at ambient temperature on specific metal oxide surfaces without external energy input. In engineering practice, it shows:

1. Effective immediately upon startup
2. No secondary pollution
3. Low pressure drop and easy maintenance

Selection Logic for Ozone Decomposition Catalysts

Catalyst performance directly determines treatment efficiency and lifespan.

1. Specific surface area: Determines the contact efficiency between ozone and active sites, directly affecting decomposition rate.
2. Bulk density: Affects bed resistance and equipment size design; too low may cause channeling.
3. Mechanical strength: Determines resistance to attrition under long-term airflow, affecting lifespan.
4. Active temperature range: High-quality catalysts should perform efficiently at ambient temperature.
5. Composition system: Practical experience shows that manganese–copper composite oxide systems exhibit higher activity and better moisture resistance in ozone decomposition.

Often Overlooked Issues in Engineering Design

• Humidity: High humidity competes for active sites; moisture-resistant catalyst systems are required
• Dust: Pre-filtration is needed to prevent pore blockage
• Space velocity: Typical design values are 5000–20000 h ⁻¹
• Bed thickness: Too thin leads to insufficient contact; too thick increases pressure drop

These factors often have a greater impact on actual performance than nominal catalyst parameters.

Summary

The key to ozone control in corona discharge is not just “removal,” but how to achieve long-term stable decomposition under ambient temperature, large airflow, and continuous operation. Catalytic decomposition offers clear advantages in mechanism, energy consumption, and engineering adaptability. The catalyst’s specific surface area, strength, bulk density, and manganese–copper composition system are critical factors determining performance. Only proper catalyst selection and bed design can ensure truly reliable ozone control.