Secondary biological treatment of municipal wastewater is primarily intended to reduce:
Correct answer: D. Biodegradable organic matter
- A. Dissolved sodium chloride
- B. Large floating objects
- C. Coarse mineral grit
- D. Biodegradable organic matter
Explanation
Secondary treatment uses microorganisms to convert biodegradable organic matter into more stable products, followed by separation of biological solids. Screening removes large objects, grit removal targets mineral particles, and salt removal requires special processes.
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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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