In an activated sludge aeration tank, mixed liquor suspended solids primarily represent:
Correct answer: B. Suspended microbial solids in the aerated mixture
- A. Dissolved oxygen molecules in the tank water
- B. Suspended microbial solids in the aerated mixture
- C. Settleable grit collected before biological treatment
- D. Chlorine compounds remaining after disinfection
Explanation
Mixed liquor suspended solids are the suspended solids present in the aeration tank, including the microbial flocs responsible for biological treatment. They are not a measure of dissolved oxygen, grit or chlorine residual.
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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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