In a water-treatment plant, a jar test is mainly performed to determine the:
Correct answer: C. Optimum coagulant dose for raw water
- A. Design speed of a rapid sand filter
- B. Required chlorine residual in clear water
- C. Optimum coagulant dose for raw water
- D. Expected sludge age in an aeration tank
Explanation
A jar test simulates coagulation and flocculation at laboratory scale to identify a suitable coagulant dose and mixing condition. It does not determine chlorine residual, filter speed or biological sludge age.
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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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