Compared with chlorine, ozone used for drinking-water disinfection has the important limitation that it:
Correct answer: A. Provides little persistent residual in the distribution system
- A. Provides little persistent residual in the distribution system
- B. Cannot inactivate bacteria under any operating condition
- C. Always increases the hardness of treated water
- D. Requires suspended solids to remain in the water
Explanation
Ozone is a strong disinfectant, but it decomposes relatively quickly and therefore provides little lasting protection in distribution pipes. It can inactivate microorganisms, although water quality and operating conditions affect its performance.
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Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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