The use of ozone in the dairy industry: Applications and examples
Ozone, a powerful oxidizing agent, has gained significant traction in the dairy industry due to its ability to disinfect, sanitize, and preserve products without leaving harmful residues. Its applications range from equipment sterilization to wastewater treatment, offering an environmentally friendly alternative to traditional chemical sanitizers.
1. Sanitization of equipment and facilities
Ozone is widely used to sanitize processing equipment, pipelines, and storage tanks in dairy plants. Its strong antimicrobial properties effectively eliminate bacteria, molds, and biofilms, ensuring compliance with stringent hygiene standards. Unlike chlorine-based sanitizers, ozone decomposes into oxygen, leaving no chemical residues that could contaminate dairy products.
In France, a leading dairy cooperative has implemented ozone-based sanitization systems in some of its processing facilities. By using ozonated water to clean equipment, the company reduces water and chemical usage while maintaining high hygiene standards. This aligns with France’s push for sustainable practices in the food industry.
In New Zealand, a major dairy, has adopted ozone for cleaning-in-place (CIP) systems. Ozone-treated water is circulated through processing lines, reducing the need for hot water and chemical sanitizers, which lowers energy costs and environmental impact.
2. Surface disinfection of dairy products
Ozone is used to disinfect the surfaces of cheese and other dairy products during aging or storage. By applying ozone gas in controlled environments, producers can prevent mold growth and extend shelf life without compromising product quality.
In Italy, producers of cheese have experimented with ozone in aging rooms to control mold on cheese rinds. This application reduces the need for manual cleaning and chemical treatments, preserving the cheese’s natural flavor while meeting export quality standards.
3. Water treatment and recycling
Dairy processing generates significant wastewater, often laden with organic matter. Ozone is used to treat this wastewater by breaking down contaminants and disinfecting the water, enabling its reuse or safe discharge. This is particularly valuable in regions facing water scarcity.
In Australia, a dairy plant has integrated ozone-based wastewater treatment systems. Ozone oxidizes organic compounds and pathogens in the wastewater, allowing the plant to recycle water for non-potable uses, such as cleaning, and comply with strict environmental regulations.
4. Milk and whey processing
Ozone can be applied to treat raw milk or whey, reducing microbial loads before further processing. While not a replacement for pasteurization, ozone can complement thermal treatments, especially for products sensitive to heat.
In the USA, some organic dairy farms use ozone to pre-treat raw milk before pasteurization. This reduces bacterial contamination, improving the safety and shelf life of milk while maintaining its nutritional profile. Soime companies have explored such technologies to meet consumer demand for minimally processed products.
5. Odor control in dairy facilities
Dairy plants often face challenges with odors from processing or waste storage. Ozone can neutralize odor-causing compounds, improving air quality for workers and nearby communities.
In Netherlands, a Dutch dairy company has implemented ozone-based air treatment systems in its processing plants. By injecting ozone into ventilation systems, the company reduces odors from whey processing and waste storage, enhancing its environmental footprint.
Benefits and challenges
Ozone offers several advantages in the dairy industry: it is highly effective, eco-friendly, and reduces reliance on chemical sanitizers. However, challenges include the need for precise control to avoid overexposure, which could affect product quality, and the initial investment in ozone generation equipment. Regulatory frameworks also vary by country, requiring producers to ensure compliance.
Ozone’s versatility makes it a valuable tool in the dairy industry, from sanitizing equipment to treating wastewater and extending product shelf life. Examples from France, New Zealand, Italy, Australia, the United States, and the Netherlands highlight its global adoption. As the industry continues to prioritize sustainability and food safety, ozone-based technologies are likely to play an increasingly prominent role in dairy processing worldwide.