What is a disadvantage of using ozone for disinfection?

What is a disadvantage of using ozone for disinfection?

• A. Lots of harmful residuals need to be removed
• B. Very long contact time required
• C. Less effective than chlorine
• D. Lack of disinfectant residuals

Answer: (D)

Using ozone for disinfection does not leave a disinfectant residual, which is one of its notable disadvantages. In water treatment, residual disinfectants are important because they help maintain water quality and provide ongoing protection against pathogens throughout the distribution system. Since ozone decomposes quickly and does not leave a lingering presence in the water, it cannot prevent contamination that might occur after the initial treatment. This characteristic necessitates the use of additional methods or chemicals to ensure continued disinfection as water moves through the distribution system. In contrast, disinfectants like chlorine can offer a lasting protective effect, significantly contributing to overall water safety and quality management. This lack of a disinfectant residual can present challenges for operators in maintaining water safety as it provides no ongoing barrier against recontamination.

Using ozone for disinfection does not leave a disinfectant residual, which is one of its notable disadvantages. In water treatment, residual disinfectants are important because they help maintain water quality and provide ongoing protection against pathogens throughout the distribution system. Since ozone decomposes quickly and does not leave a lingering presence in the water, it cannot prevent contamination that might occur after the initial treatment. This characteristic necessitates the use of additional methods or chemicals to ensure continued disinfection as water moves through the distribution system. In contrast, disinfectants like chlorine can offer a lasting protective effect, significantly contributing to overall water safety and quality management. This lack of a disinfectant residual can present challenges for operators in maintaining water safety as it provides no ongoing barrier against recontamination.