The main purpose of a manhole in a sanitary sewer network is to provide:
Correct answer: B. Access for inspection and cleaning
- A. Storage for treated wastewater
- B. Access for inspection and cleaning
- C. Additional biological treatment
- D. Removal of dissolved oxygen
Explanation
Manholes provide access at changes in sewer direction, slope, size and junctions so that inspection and cleaning can be carried out. They are not designed as storage tanks or biological treatment units.
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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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