Ozone Monitoring in Food & Beverage Processing: Ensuring Safety and Quality

Ozone (O₃) has become an indispensable tool in the food and beverage industry. Its powerful oxidizing properties make it highly effective for disinfecting water, sanitizing equipment, and extending the shelf life of perishable products. However, the same reactivity that makes ozone valuable also demands careful control. Without precise ozone monitoring, processors risk either ineffective sanitation or unsafe residual levels that could compromise product quality and consumer safety.

In this article, we explore how dissolved ozone monitoring supports food and beverage operations, the regulatory standards that govern its use, and best practices for maintaining optimal ozone levels throughout the production process.

Why Ozone Is Used in Food & Beverage Processing

The food and beverage industry faces constant pressure to ensure product safety while minimizing chemical residues. Traditional sanitizers like chlorine can leave undesirable byproducts and affect taste. Ozone offers a compelling alternative because it:

• Decomposes to oxygen – Unlike chlorine, ozone breaks down into molecular oxygen (O₂), leaving no harmful chemical residues in the final product.
• Kills pathogens effectively – Ozone is one of the most potent disinfectants available, capable of eliminating bacteria, viruses, molds, and parasites at concentrations measured in parts per million.
• Improves water quality – Ozone oxidizes organic contaminants, removes color and odor, and reduces total organic carbon (TOC) in process water.
• Extends shelf life – By reducing microbial load on produce and packaging surfaces, ozone treatment can significantly extend product freshness.

These benefits have led to widespread adoption of ozone in applications ranging from bottled water production and fruit washing to CIP (Clean-in-Place) systems and cold storage atmospheres.

The Critical Role of Dissolved Ozone Monitoring

While ozone is highly effective, its effectiveness depends entirely on maintaining the right concentration. Too little ozone fails to achieve disinfection; too much can damage equipment, alter product flavor, or create safety hazards for workers. This is where dissolved ozone monitors become essential.

A dissolved ozone monitor continuously measures the concentration of ozone dissolved in water, providing real-time feedback that allows operators to:

1. Maintain target disinfection levels – Ensure ozone concentration stays within the effective range for the specific application (typically 0.5–4.0 ppm for most food processing).
2. Prevent over-dosing – Avoid excessive ozone that could corrode stainless steel equipment or leave residual tastes in beverages.
3. Document compliance – Generate continuous records for auditors and regulators demonstrating that sanitation protocols are being followed.
4. Optimize ozone generator output – Adjust generator settings based on actual demand, reducing energy consumption and extending equipment life.

Key Applications in Food & Beverage

Bottled Water and Beverage Production

In bottled water facilities, ozone is used for both primary disinfection and final sanitization of bottles and caps before filling. The U.S. FDA recognizes ozone as a Generally Recognized As Safe (GRAS) substance for food contact applications, but requires that residual ozone levels be carefully controlled.

Dissolved ozone monitors installed at critical points—after the ozone contact tank and before the filler—ensure that water meets disinfection requirements while residual ozone decomposes to safe levels before packaging.

Fresh Produce Washing

Leafy greens, berries, and other fresh produce are often washed in ozonated water to reduce microbial contamination. Research published by the World Health Organization has demonstrated that ozone washing can achieve 1–3 log reductions in pathogenic bacteria without the formation of chlorinated byproducts.

However, produce surfaces can rapidly consume ozone, causing concentration to drop below effective levels. Continuous monitoring with a dissolved ozone sensor allows operators to adjust flow rates or ozone dosing to maintain consistent sanitation.

Clean-in-Place (CIP) Systems

Many dairy, brewery, and juice processing plants use ozone-enhanced CIP cycles to sanitize tanks, pipes, and heat exchangers. Ozone CIP can reduce cleaning time and eliminate the need for hot water sanitization, saving significant energy costs.

A dissolved ozone monitor integrated into the CIP skid verifies that the ozonated rinse water reaches and maintains the target concentration for the required contact time, ensuring validated sanitation.

Wine and Beer Processing

Wineries use ozone to sanitize barrels, tanks, and bottling lines without leaving residues that could affect wine flavor. Breweries employ ozone for bottle rinsing and keg washing. In both cases, precise ozone control is critical—excessive ozone can oxidize desirable flavor compounds, while insufficient ozone fails to eliminate spoilage organisms.

Regulatory Standards and Guidelines

Several regulatory bodies provide guidance on ozone use in food processing:

Under HACCP principles, ozone concentration in process water is often designated as a Critical Control Point (CCP). This means continuous or frequent monitoring is mandatory, with documented corrective actions when limits are exceeded.

Choosing the Right Dissolved Ozone Monitor for Food Processing

Not all dissolved ozone monitors are suitable for food and beverage applications. When selecting an instrument, consider the following factors:

1. Measurement Range – Food processing typically requires 0–5 ppm or 0–10 ppm. Ensure the monitor covers your operating range with adequate resolution at the low end.
2. Response Time – Fast response (T90 < 30 seconds) is important for applications with rapid flow changes, such as CIP cycles.
3. Sensor Technology – Membrane-covered electrochemical sensors are common, but UV absorption-based dissolved ozone monitors offer higher accuracy and longer calibration intervals for critical applications.
4. Materials of Construction – Wetted parts must be FDA-compliant (316L stainless steel, PTFE, or other food-grade materials).
5. Output and Integration – 4–20 mA, RS-485, or digital outputs for integration with PLCs and SCADA systems are essential for automated process control.
6. IP Rating – Food processing environments are often wet and require washdown-rated enclosures (IP65 or higher).

Explore our range of dissolved ozone monitors designed for industrial water treatment and food processing applications.

Best Practices for Ozone Monitoring in Food Plants

To maximize the benefits of ozone while ensuring safety and compliance, follow these operational best practices:

• Install monitors at critical control points – Place sensors after ozone injection, at process inlets, and at points where residual ozone must be minimized.
• Calibrate regularly – Follow manufacturer recommendations, typically monthly or quarterly, using certified ozone standards or zero/span solutions.
• Monitor water temperature – Ozone solubility decreases significantly as temperature rises. Compensation or control of water temperature improves measurement accuracy.
• Document everything – Maintain calibration records, alarm logs, and corrective action reports for regulatory audits.
• Train operators – Ensure staff understand how to interpret readings, respond to alarms, and perform basic troubleshooting.
• Use redundant monitoring – For critical CCPs, consider dual sensors or backup measurement methods to prevent undetected failures.

Conclusion

Ozone monitoring is not optional in modern food and beverage processing—it is a fundamental requirement for safety, quality, and regulatory compliance. A well-specified dissolved ozone monitor provides the real-time data needed to maintain effective sanitation while protecting both products and people.

Whether you are sanitizing bottled water, washing fresh produce, or running CIP cycles, investing in reliable ozone measurement technology pays dividends in reduced risk, improved efficiency, and audit readiness.

For assistance selecting the right dissolved ozone monitor for your food processing application, contact our application engineers or browse our dissolved ozone monitoring solutions.

Questions about ozone in food processing? Share your application details in the comments and our team will respond with tailored recommendations.