In a secondary clarifier following biological treatment, the main purpose is to:
Correct answer: B. Separate biological solids from treated liquid
- A. Add oxygen to raw sewage
- B. Separate biological solids from treated liquid
- C. Remove dissolved salts by crystallization
- D. Screen large floating refuse
Explanation
The secondary clarifier allows biological flocs to settle, producing a clarified effluent and concentrated sludge. Aeration occurs in the biological reactor, while screening is normally performed near the plant inlet.
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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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