The sludge volume index in an activated sludge plant is primarily used to assess:
Correct answer: D. The settling characteristics of activated sludge
- A. The concentration of dissolved salts in sludge
- B. The chlorine demand of treated wastewater
- C. The oxygen content of return sludge
- D. The settling characteristics of activated sludge
Explanation
Sludge volume index relates the settled sludge volume to the mass of suspended solids and indicates how well activated sludge settles. A high value commonly signals poor settling or bulking problems.
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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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