What is the main purpose of coagulation in conventional drinking-water treatment?
Correct answer: C. To destabilize colloidal particles so they can form larger flocs
- A. To destroy all viruses by chemical oxidation
- B. To remove dissolved salts through membrane separation
- C. To destabilize colloidal particles so they can form larger flocs
- D. To increase the dissolved oxygen concentration of water
Explanation
Coagulation neutralizes or reduces the electrical forces that keep colloidal particles dispersed. The destabilized particles can then collide and form flocs during flocculation, which are removed by sedimentation and filtration.
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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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