Ozone disinfection of water: effectiveness against Salmonella
Salmonella and water safety challenges
The presence of pathogenic bacteria in water systems is a critical issue in both public health and industrial operations. Among these, Salmonella is a major concern due to its role in waterborne and foodborne infections.
Ensuring its removal is essential in drinking water production and industrial water treatment processes.
Ozone: a high-performance oxidising agent
Ozone (O₃) is one of the most powerful oxidising agents used in water treatment. Its strong oxidation potential enables rapid inactivation of a wide range of microorganisms, including Gram-negative bacteria such as Salmonella.
Unlike conventional disinfectants, ozone decomposes into oxygen, leaving no harmful residues.
Mechanism of action on Salmonella
Ozone acts through multiple oxidation pathways:
- Disruption of cell membranes
- Oxidation of proteins and enzymes
- Damage to bacterial DNA
The lipid-rich outer membrane of Salmonella makes it particularly vulnerable, allowing rapid inactivation in aqueous environments.
Disinfection performance in water
The effectiveness of ozone is defined by the CT concept (Concentration × Time):
- 99% inactivation: CT ≈ 0.02 – 0.06 mg·min/L
- 99.9% inactivation: CT ≈ 0.06 – 0.12 mg·min/L
These low CT values confirm the high sensitivity of Salmonella to ozone treatment.
Comparison with other microorganisms
- Similar sensitivity: E. coli
- More sensitive than: Staphylococcus, Enterococcus
- More resistant organisms: bacterial spores, mycobacteria
This makes Salmonella a reliable benchmark for ozone disinfection efficiency.
Key benefits of ozone treatment
- ✔️ Fast reaction kinetics
- ✔️ High efficiency (>99.9%)
- ✔️ No chemical residues
- ✔️ Broad-spectrum disinfection
- ✔️ Environmentally friendly
Ozone is therefore a strong alternative to traditional disinfection methods such as chlorination.
Industrial applications
- Drinking water treatment plants
- Industrial process water
- Food processing industry
- Sanitary safety systems
Its flexibility makes it suitable for a wide range of industrial applications.
Ozone is a highly effective solution for inactivating Salmonella in water. Its rapid action and low dosage requirements enable disinfection levels exceeding 99.9% under controlled conditions.
It represents a modern, efficient, and sustainable approach to water treatment.