What is a key limitation of ultraviolet disinfection compared with chlorination?
Correct answer: A. It requires water with adequate clarity
- A. It requires water with adequate clarity
- B. It cannot inactivate any bacteria
- C. It always increases water hardness
- D. It produces large quantities of sludge
Explanation
Ultraviolet light works effectively only when suspended particles do not shield microorganisms from the radiation. Unlike chlorine, ultraviolet treatment also does not provide a lasting disinfectant residual in the distribution system.
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About Environmental Engineering
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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