# PA3 - ENVE 2001 Winter 2016 Problem Analysis 3(February 3...

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ENVE 2001, Winter 2016 Problem Analysis 3 (February 3) Problem 1. The diagram on the right shows the organic carbon balance in a wastewater treatment plant that treats domestic sewage. The numbers are estimates of the molar flow of organic carbon (moles C per capita per day). Calculate the molar flow of organic carbon at the inlet of the settling tank (the unit that is represented by the inverse triangle on the far right). How much of the material coming out at the bottom of this unit is recirculated to the preceding unit? Problem 2. Is the material balance satisfactory in the diagram below? (t/wk = tons per week) 1.4

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Problem 3. A gas containing 80% CH 4 and 20% He (by volume) is sent through a quartz diffusion tube (see the Figure below) to recover the helium. Twenty percent by weight of the original gas is recovered, and its composition is 50% He (by volume). Calculate the composition
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Unformatted text preview: of the waste gas if 10 5 moles of gas are processed per minute. Problem 4. One of the goals of water and wastewater treatment plants is to remove suspended particles from water. This can be achieved in a settling tank (aka sedimentation tank) where particles settle out of the solution by gravity. The settled particles are removed from the tank via the outlet at the bottom (Q w ), and the clear water exits the tank via the outlet on the right (Q out ). Consider a settling tank in a wastewater treatment plant that is operating under steady-state conditions and has influent concentration (C in ) of 220 mg/L of suspended solids, and effluent concentration (C out ) of 45 mg/L, and a waste concentration (C w ) of 10,000 mg/L. Assume that no reactions involving these solids occur in the tank. If the influent flow rate is 450 m 3 /h, what is the waste flow rate Q w ? Sedimentation Tank...
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• Spring '14
• OnitaBasu
• Environmental Engineering, 50%, Sewage treatment, 20%, Wastewater Treatment Plant, 45 mg, 10,000 mg

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