The self-cleansing velocity in a sanitary sewer is intended to prevent:
Correct answer: B. Deposition of solids on the sewer bottom
- A. Excessive chlorine formation
- B. Deposition of solids on the sewer bottom
- C. Infiltration of groundwater through joints
- D. Generation of dissolved oxygen in sewage
Explanation
A self-cleansing velocity keeps suspended solids moving so they do not settle and obstruct the sewer. The required velocity depends on factors such as pipe size, slope and the nature of the wastewater.
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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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