Which condition is most likely to cause septic sewage and offensive odours in a sewer?
Correct answer: A. Long retention under anaerobic conditions
- A. Long retention under anaerobic conditions
- B. Excessive dissolved oxygen
- C. High water velocity with good ventilation
- D. Short travel time with fresh sewage
Explanation
When sewage remains stagnant or moves slowly for a long period, oxygen is depleted and anaerobic decomposition can produce offensive gases. Good ventilation and adequate flow generally reduce this risk.
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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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