What is the purpose of breakpoint chlorination in water treatment?
Correct answer: C. To satisfy chlorine demand and produce a free residual
- A. To remove suspended solids by gravity
- B. To convert hardness into insoluble carbonates
- C. To satisfy chlorine demand and produce a free residual
- D. To increase dissolved oxygen by mechanical mixing
Explanation
Breakpoint chlorination adds enough chlorine to react with reducing substances and combined chlorine, after which a measurable free chlorine residual develops. It is not a sedimentation or hardness-removal process.
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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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