The test for finding the optimum coagulant dose in water is _Ĭlarification: Jar test is used to find the optimum coagulant concentration that is required to cause coagulation in water so that the settling of suspended impurities takes place.Ħ. The detention period for a sedimentation tank where coagulation takes place is _Ĭlarification: The detention period for a sedimentation tank without coagulation is 4 hours, whereas with coagulation is 2 – 2.5 hours.ĥ. The overflow rate for a plain sedimentation tank is _ litre/day/metre 2.Ĭlarification: The overflow rate for a plain sedimentation tank lies between 12000-18000 litre/day/metre 2.Ĥ. It results in variation in the detention period in the top and bottom layer of wastewater in the tank.ģ. The deviation from the ideal flow of wastewater in the sedimentation tank causes _Ĭlarification: The deviation from the ideal flow of wastewater in the sedimentation tank causes short circuiting. Which of the following cannot be the velocity of flow in the horizontal flow sedimentation tank?Ĭlarification: The maximum value of the velocity of flow is 30cm/min, so it cannot be 39cm/min.Ģ. Environmental Engineering Multiple Choice Questions on “Design of Sedimentation Tank”.ġ.
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