A septic tank primarily treats domestic wastewater by:
Correct answer: A. Settling solids and anaerobic decomposition
- A. Settling solids and anaerobic decomposition
- B. Rapid filtration and chlorination
- C. Aerobic oxidation in suspended growth
- D. Chemical precipitation of dissolved salts
Explanation
A septic tank retains settleable solids and allows anaerobic organisms to partially decompose the accumulated sludge. It does not provide the complete aerobic treatment expected from an activated-sludge plant.
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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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