In an activated-sludge plant, sludge age is most directly related to the average time that microorganisms:
Correct answer: D. Remain in the aeration system
- A. Contact the chlorine solution
- B. Stay inside the inlet screen
- C. Remain in the sewer pipe
- D. Remain in the aeration system
Explanation
Sludge age, also called solids retention time, represents the average period microorganisms are retained in the biological treatment system. It is controlled by wasting and returning sludge and strongly affects biological performance.
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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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