In a conventional water-treatment plant, rapid sand filtration is mainly used after coagulation and sedimentation to remove:
Correct answer: A. Remaining fine suspended particles and floc
- A. Remaining fine suspended particles and floc
- B. Most dissolved sodium and chloride
- C. All taste-producing organic compounds
- D. The entire oxygen demand of raw sewage
Explanation
Rapid sand filters remove floc particles and other fine suspended matter that escape sedimentation. They are not designed to remove dissolved salts or to provide complete treatment of sewage oxygen demand.
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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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