Which process is commonly used to reduce excessive hardness in drinking water?
Correct answer: C. Lime-soda softening
- A. Aeration with compressed air
- B. Screening through coarse bars
- C. Lime-soda softening
- D. Disinfection with ultraviolet light
Explanation
Lime-soda softening precipitates calcium and magnesium compounds, which cause hardness. Aeration can remove some dissolved gases but does not provide general hardness control.
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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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