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# ENV4001 Assignment 4 Answer - What is the surface area of...

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1 G. Chen Summer 2011 ENV4001 Environmental Engineering Problem Sets #4 Due Date: June 22, 2011 1. A rectangle sedimentation tank with a length : width ratio of 3: 1 receives a flow of 850 m 3 /d. The sedimentation tank depth is 4.0 m and detention time of the water in the sedimentation tank is 2.4 h. What is the horizontal flow through velocity? 2. A suspension with a flow of 10 5 m 3 /day at a particle concentration of 2 g/L is to be loaded to a clarifier with a top surface area of 1000 m 2 . The applicable subsidence curve is shown as below.

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2 3. A suspension with a flow of 10 5 m 3 /day at a particle concentration of 2.5 g/L is to be loaded to a clarifier. The applicable subsidence curve is shown as below. If the clarifier is fully loaded and the underflow rate v u is 10 m/d. What is the critical underflow concentration C L ?

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Unformatted text preview: What is the surface area of the clarifier? 3 4. A wastewater treatment plant receives wastewater with S = 350 mg/L BOD 5 , Q = 10 8 L/day, biomass concentration X = 6 g/L, the efficiency of the wastewater treat plant is 90%, determine the volume of the activated sludge reactor. Relevant parameters are: 4 K s = 1000 mg/L, k = 8 mg BOD 5 /mg biomass · day, Y = 0.5 mg biomass/mg BOD 5 , k d = 0.05 day-1 . 5. A wastewater treatment plant receives wastewater with S = 300 mg/L BOD 5 , Q = 10 8 L/day, θ c = 8 days, the activated sludge reactor volume is 10 7 L, the wasted sludge is discharged at a rate of 10 5 L/day, determine the discharged wasted sludge concentration. Relevant parameters are: K s = 250 mg/L, k = 8 mg BOD 5 /mg biomass · day, Y = 0.5 mg biomass/mg BOD 5 , k d = 0.05 day-1 . 5...
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• Summer '11
• Chen
• Sewage treatment, Wastewater Treatment Plant, sedimentation tank, G. Chen, applicable subsidence curve, mg BOD5/mg biomass

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ENV4001 Assignment 4 Answer - What is the surface area of...

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