The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
Correct answer: A. Decreases
- A. Decreases
- B. Increases
- C. Remain constant
- D. May increase or decrease; depends on the chemical characteristics of polluted water
Explanation
As water temperature rises, viscosity falls and particle collisions and floc formation generally improve, so less coagulant is usually required. Colder water commonly needs a higher dose because coagulation is slower.
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