Debunking Myths About Cold Plasma Ozone Generators

In the ozone industry, generator performance is often evaluated using ozone production ratings alone (g/h). However, ozone concentration, oxygen consumption, transfer efficiency, and actual dissolved ozone performance are equally important factors when comparing technologies.

Some manufacturers promote “cold plasma” ozone generators as inherently more efficient due to lower plasma temperatures and reduced heat generation. While lower operating temperatures can theoretically improve ozone formation, real-world system performance depends on multiple engineering factors, including dielectric design, cooling efficiency, power density, gas flow optimization, and mass transfer capability.
In practice, many commercially available “cold plasma” ozone generators produce ozone concentrations in the range of 3–5% wt, which can significantly limit ozone dissolution efficiency in water treatment applications.

By comparison, the Absolute Ozone® Atlas 30 is capable of producing ozone concentrations as high as 9–12% wt under standard operating conditions, resulting in substantially higher dissolved ozone performance.</

One of the most important factors in ozone dissolution efficiency is ozone concentration by weight (% wt). Higher ozone concentrations generally improve mass transfer efficiency, allowing more ozone to dissolve into water with lower gas consumption.

Many commercially available “cold plasma” ozone generators operate at ozone concentrations in the range of approximately 3–5% wt. While these systems may achieve their advertised ozone production under certain conditions, lower ozone concentration significantly limits dissolved ozone performance in practical water treatment applications.

By comparison, the Absolute Ozone® Atlas 30 is capable of producing ozone concentrations as high as 9–12% wt under standard operating conditions.

This higher ozone concentration allows substantially greater ozone dissolution efficiency while using significantly less oxygen.

Consider a 30 g/h ozone generator used in a water treatment system:

Typical “Cold Plasma” Generator

• Ozone concentration: 3–5% wt
• Oxygen consumption: approximately 12 SLPM
• Dissolved ozone performance: approximately 10 g/h under ideal conditions

Absolute Ozone® Atlas 30

• Ozone concentration: 9–12% wt
• Oxygen consumption: approximately 4 SLPM
• Dissolved ozone performance: approximately 27 g/h

In practical applications, the higher concentration output of the Atlas 30 enables significantly more ozone to dissolve into water, improving oxidation efficiency and reducing overall system demand.

Lower concentration ozone gas contains a larger proportion of carrier gas relative to ozone. This reduces mass transfer efficiency and often requires:

• Higher oxygen flow rates
• Larger vent gas destruction systems
• Additional generators
• Increased operational complexity
• Greater maintenance requirements

To achieve dissolved ozone performance comparable to a single Atlas 30, multiple low-concentration generators may be required.

For example, three 30 g/h low-concentration generators could consume approximately:

• 36 SLPM total oxygen flow
• Three separate power systems
• Additional plumbing and controls
• Increased installation footprint

By contrast, a single Atlas 30 can achieve equivalent or superior dissolved ozone performance using only 4 SLPM of oxygen.

The term “cold plasma” is often used as a marketing term rather than a meaningful indicator of ozone system performance.

Ultimately, the most important metrics are:

• Dissolved ozone delivery
• Energy efficiency
• Oxygen consumption
• Reliability
• Maintenance requirements
• Overall operating cost

A properly engineered high-concentration corona discharge ozone generator can often outperform lower-concentration systems while requiring less oxygen, fewer components, and lower long-term operating costs.

When evaluating ozone generators, it is important to look beyond advertised ozone production ratings alone.

Real system performance depends on the ability to efficiently dissolve ozone into water while minimizing oxygen consumption, operating costs, and system complexity.

Higher concentration ozone systems can provide substantially greater dissolved ozone performance, improved efficiency, and lower overall cost of ownership compared to lower-concentration alternatives.

For demanding water treatment applications, properly engineered high-concentration ozone generators remain one of the most efficient and cost-effective solutions available today.