Estimate the mass of oxygen to be supplied for a new activated sludge plant atPea Ridge to treat a flow rate of 8,450 m³/day. Assume that the concentrationof bCOD going into the system (So) is 137 mg/L, that the bCOD leaving thesystem (S) is 16.3 mg/L, and that the mass of cells produced per day (Pxvss) is277.4 kg/d. Express your answer in kg/day and round to the nearest integer.

Given Data:Flowrate (Q): 8450 m³/dayInfluent bCOD (S₀): 137 mg/LEffluent bCOD (S): 16.3 mg/LBiomass…

Answered: Estimate the mass of oxygen to be…

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy

Section: Chapter Questions

Problem 6P

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You are an engineer designing an aeration tank for a wastewater treatment plant receiving municipal waste. The activated sludge system (aeration tank and secondary clarifier) you design needs to remove 85% of the incoming BODs from the primary effluent, giving a final concentration of 30.0 mg BODs/L exiting the system. Your design will maintain a concentration of 2500 mg VSS/L and F/M ratio of 0.5 g BOD/g VSS d in the aeration tank. In an effort to keep the waste activated sludge low in water, only about 0.1% of the primary effluent flow (Q) exits the WAS line. The secondary effluent has a flow rate of 9990 m³/d. What volume (in m³) will the aeration tank need to be? Write out all equations and state any assumptions as needed. Primary effluent: Q. Xo, So Aeration tank V, X, S Secondary Secondary clarifier effluent: Qe, X, S O RAS line: Q, X., S Activated sludge control volume WAS line: Qwx, S
. A wastewater treatment plant treats industrial waste and discharges 5.0 x 10-6 M benzene (C6H6) at a flowrate of 8 m3 /s into a 1.0 x 109 m3 lake. The stream feeding the lake has a benzene concentration of 1.0 μg/L and a flowrate of 100 m3 /s. Benzene has a natural decay rate of 0.038day-1.a) What is the concentration of benzene in the downstream? What is the maximum contaminant limit (MCL) for benzene? Does the concentration you calculated meet the MCL set by the Safe Drinking Water Act?b) If the standard is exceeded, by how many μg/L of benzene in the wastewater effluent will the treatment plant need to reduce?
Determine the daily volume of methane and total gas produced in an anaerobic digester if the biosolids flow rate is 200 m³/d and the COD concentration going into the reactor is 5,000 g/m³. Assume yield is 0.05 g VSS/g COD, that there is 90% COD removal, and that methane is 50% of the total gas volume. Assume that actual gas production at the operating temperature is 0.4 L of CH4 per g of COD. Express your answer in m³/d and round to the nearest integer.
You are an engineer designing an aeration tank for a wastewater treatment plant receiving municipal waste. The activated sludge system (aeration tank and secondary clarifier) you design needs to remove 85% of the incoming BODs from the primary effluent, giving a final concentration of 30.0 mg BOD5/L exiting the system. Your design will maintain a concentration of 2500 mg VSS/L and F/M ratio of 0.5 g BOD/g VSS d in the aeration tank. In an effort to keep the waste activated sludge low in water, only about 0.1% of the primary effluent flow (Q) exits the WAS line. The secondary effluent has a flow rate of 9990 m³/d. What volume (in m³) will the aeration tank need to be? Write out all equations and state any assumptions as needed. Primary effluent: Aeration tank V, X, S Secondary clarifier Secondary effluent: Q. Xo. So Qe, Xe, S 0 po RAS line: Q, X., S Activated sludge control volume WAS line: Qw, X, S

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