Compared with a combined sewer system, a separate sanitary sewer system mainly reduces:
Correct answer: C. Stormwater entering the sewage-treatment plant
- A. The concentration of dissolved oxygen in rivers
- B. The need for household water meters
- C. Stormwater entering the sewage-treatment plant
- D. The production of water-treatment chemicals
Explanation
Separate systems carry sanitary sewage and stormwater through different pipes, so rainfall produces less hydraulic loading at a sewage-treatment plant. This can reduce bypasses and overflows during storms.
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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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