# With the recycle line the resulting food to mass fm

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with the recycle line , the resulting food to mass (F/M) ratio is 0.58 mg BOD 5 /mg VSS·d. What is the new MLVSS concentration (in mg/L VSS)?

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EVEG 3110 Name: _________________ Date: _________ g. What is the flow rate of the waste sludge line? (Assume a value of 400 mgVSS/L for MLVSS if you did not obtain a reasonable value in part f). h. What is the hydraulic retention time of the activated sludge basin before and after the recycle line has been added? Before: After: 3. A perfectly mixed aeration pond with no recycle (return line) serves as the biological reactor for a small community. The pond receives 30 m 3 /d of influent of a BOD 5 of 350 mg/L that must be reduced to 20 mg/L before discharge. It has been found that the kinetic constants for the system are K s = 100 mg/L BOD 5 , k d = 0.10 d -1 , µm = 1.6 d -1 , and Y is 0.60 mgVSS/mgBOD 5 . a) What must the hydraulic detention time be in the aeration pond?
EVEG 3110 Name: _________________ Date: _________ b) What mass of microbes will be produced in the pond each day?
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• Spring '10
• Malone
• Sewage treatment, WASTEWATER MICROBIOLOGY, recycle line

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