# The volume of the reactor is 550 m 3 the half

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The volume of the reactor is 550 m 3 - The half velocity constant is 80 mg/L BOD 5 - The maximum specific growth rate is 2.8 d -1 - The endogenous decay rate is 0.07 d -1 - The yield coefficient is 0.65 mg VSS/mg BOD 5 - The substrate concentration of the primary effluent (entering the activated sludge process) is 220 mg/L BOD 5 . - The new system is designed to have a solids retention time of 8 d a. Draw a schematic of an activated sludge system before and after the addition of a recycle line: Before: After: b. What is the final substrate concentration in the NO recycle system (before the RAS line is added)? c. What is the BOD 5 removal efficiency in the NO recycle system (before the RAS line is added)? Activated Sludge Activated Sludge

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EVEG 3110 Name: _________________ Date: _________ d. What is the MLVSS concentration in the NO recycle system? e. If the sludge produced has a concentration of 12,500 mg/L VSS, which is now recycled via the new recycle line at a flow of 150 m 3 /d, what is the resulting ‘influent’ MLVSS concentration (in mg/L VSS) entering the aeration tank? (Hint: refer to your drawing and do not over-think this problem) f. In the new system,
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• Spring '10
• Malone
• Sewage treatment, WASTEWATER MICROBIOLOGY, recycle line

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