In drinking-water treatment, dissolved air flotation is especially useful for removing particles that are:
Correct answer: B. Light and difficult to settle
- A. Dense and rapidly settling
- B. Light and difficult to settle
- C. Completely dissolved in water
- D. Chemically bonded to hardness
Explanation
Dissolved air flotation attaches fine air bubbles to low-density particles, causing them to rise for removal. Dense particles that settle readily are more appropriately removed by sedimentation.
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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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