A complete mixed activated sludge process (CMAS) is to be designed to treat 5MGD of primary effluent having a BOD5 of 180 mg/L. The NPDES permit requires that the effluent BOD5 and TSS concentration be 20 mg/L or less on an annual average basis. The following biokinetic coefficient obtained at 15C: Y = 0.6 mg VSS/mg BOD5, k = 2.85d-1, Ks = 70 mg/L BOD5, and kd = 0.041 d-1. Assume that the MLVSS concentration in the aeration basisn is maintained at 2500 mg/L. Determine: a. The minimum MCRT (d) b. The MCRT necessary to meet the NPDES permit requirement (d)
A complete mixed activated sludge process (CMAS) is to be designed to treat 5MGD of primary effluent having a BOD5 of 180 mg/L. The NPDES permit requires that the effluent BOD5 and TSS concentration be 20 mg/L or less on an annual average basis. The following biokinetic coefficient obtained at 15C: Y = 0.6 mg VSS/mg BOD5, k = 2.85d-1, Ks = 70 mg/L BOD5, and kd = 0.041 d-1. Assume that the MLVSS concentration in the aeration basisn is maintained at 2500 mg/L. Determine: a. The minimum MCRT (d) b. The MCRT necessary to meet the NPDES permit requirement (d)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A complete mixed activated sludge process (CMAS) is to be designed to treat 5MGD of primary effluent having a BOD5 of 180 mg/L. The NPDES permit requires that the effluent BOD5 and TSS concentration be 20 mg/L or less on an annual average basis. The following biokinetic coefficient obtained at 15C: Y = 0.6 mg VSS/mg BOD5, k = 2.85d-1, Ks = 70 mg/L BOD5, and kd = 0.041 d-1. Assume that the MLVSS concentration in the aeration basisn is maintained at 2500 mg/L. Determine:
a. The minimum MCRT (d)
b. The MCRT necessary to meet the NPDES permit requirement (d)
c. The volume of the aeration basin (ft3)
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