At the entrance of a water-treatment plant, bar screens are mainly installed to remove:
Correct answer: C. Large floating and suspended debris
- A. Pathogenic microorganisms
- B. Dissolved mineral salts
- C. Large floating and suspended debris
- D. Fine colloidal particles
Explanation
Bar screens physically intercept large materials such as sticks, rags and plastics before later treatment units. They do not remove dissolved salts or microorganisms, while fine colloids require coagulation 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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