Which treatment process is specifically intended to remove dissolved nitrogen and phosphorus from wastewater?
Correct answer: D. Tertiary treatment
- A. Primary sedimentation
- B. Preliminary treatment
- C. Screening treatment
- D. Tertiary treatment
Explanation
Tertiary or advanced treatment can remove nutrients that remain after conventional biological treatment. Screening and primary sedimentation mainly remove physical solids rather than dissolved nutrients.
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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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