The dairy industry has the highest requirements for microbiological safety. Pathogenic microorganisms — Listeria, Salmonella, E.coli — can survive even after pasteurization, multiplying in milk lines and on equipment surfaces.
Ozonation solves this problem comprehensively: disinfecting cooling tanks, milking equipment, milk lines and storage tanks without using chemical detergents. Ozone is effective against thermophilic bacteria resistant to high temperatures.
Ozone application in dairy production
| Treatment object | Method | Concentration | Efficiency |
|---|---|---|---|
| Milking equipment | Ozonated water | 2–3 mg/L | 99.9% |
| Cooling tanks | Water + air | 3–5 mg/L | 99.99% |
| Milk lines | Ozonated water flush | 2–3 mg/L | 99.9% |
| Storage tanks | Gaseous ozone | 5–10 mg/m³ | 99.99% |
| Cold rooms | Gaseous ozone | 3–6 mg/m³ | 99.5% |
Advantages over traditional methods
- Destruction of thermophilic bacteria resistant to pasteurization
- Listeriosis prevention — critical for soft cheeses and cottage cheese
- No chemical residues on equipment surfaces
- Ability to treat hard-to-reach areas in milk lines
- Disinfection at low temperatures — no heating required
- Process automation — reduced human factor influence
Comparison of sanitation methods
| Parameter | Ozonation | Chemical CIP cleaning |
|---|---|---|
| Efficiency against Listeria | 99.99% | 95–99% |
| Chemical residues | None | Rinsing required |
| Thermophilic bacteria | Destroyed | Partially survive |
| Treatment time | 15–30 minutes | 45–90 minutes |
| Water consumption | Minimal | Significant |
| Eco-friendliness | Complete | Waste disposal required |
Dairy product storage
Ozonation of cold rooms for dairy product storage prevents mold development, suppresses psychrotrophic bacteria growth and extends shelf life of cottage cheese, sour cream, yogurt by 30–50%.
| Product | Temperature | Concentration | Shelf life increase |
|---|---|---|---|
| Cottage cheese | +2...+6°C | 3–4 mg/m³ | +40% |
| Sour cream | +2...+6°C | 2–3 mg/m³ | +35% |
| Yogurt | +2...+6°C | 2–3 mg/m³ | +30% |
| Butter | -6...-12°C | 3–5 mg/m³ | +50% |
| Soft cheeses | +4...+8°C | 3–6 mg/m³ | +45% |
Listeriosis prevention
Listeria monocytogenes is one of the most dangerous pathogens in the dairy industry. The bacterium can multiply at refrigerator temperature (+4°C), survive in biofilms on equipment surfaces and cause severe diseases with fatal outcomes.
Ozone effectively destroys Listeria biofilms and kills bacterial cells. At ozone concentration of 0.5–1.0 mg/L in water, 99.99% inactivation of L. monocytogenes is achieved within 5 minutes of contact.
Benefits for dairy production
HACCP compliance
Ozonation is a critical control point in food safety systems
Chemical savings
Reduction of cleaning and disinfection costs by up to 80%
Extended shelf life
30–50% longer shelf life for fermented dairy products
Product safety
Guaranteed destruction of Listeria and thermophilic bacteria