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An activated sludge process with an aeration basin of 4,000 m³ is treating a wastewater flow of 7,500 m³/day. The influent BOD5 is 250 mg/L and the activated sludge is designed to remove 90% of BOD5. (**Biomass wasting directly from the aeration basin) Pertinent data: Biomass concentration in aeration basin = 2000 mg/L Biomass concentration in the effluent = 20 mg/L Waste flow rate = 250 m³/day (biomas wasted directly from the aeration basin) kd = 0.01 d-¹ (a) Calculate the MCRT of the process. (b) Determine the yield coefficient, Y. (c) If the recycle ratio is 0.5 (i.e., QR = 50% of Q), calculate biomass concentration in recycled activated sludge, XR. (Assume: influent biomass, X = 0) Influent Biomass Wasting Biomass recirculation Effluent

An activated sludge process with an aeration basin of 4,000 m³ is treating a wastewater flow of 7,500 m³/day. The influent BOD5 is 250 mg/L and the activated sludge is designed to remove 90% of BOD5. (**Biomass wasting directly from the aeration basin) Pertinent data: Biomass concentration in aeration basin = 2000 mg/L Biomass concentration in the effluent = 20 mg/L Waste flow rate = 250 m³/day (biomas wasted directly from the aeration basin) kd = 0.01 d-¹ (a) Calculate the MCRT of the process. (b) Determine the yield coefficient, Y. (c) If the recycle ratio is 0.5 (i.e., QR = 50% of Q), calculate biomass concentration in recycled activated sludge, XR. (Assume: influent biomass, X = 0) Influent Biomass Wasting Biomass recirculation Effluent

Solid Waste Engineering
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter2: Municipal Solid Waste Characteristics And Quantities
Section: Chapter Questions
Problem 2.15P
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An activated sludge process with an aeration basin of 4,000 m³ is treating a wastewater flow of 7,500 m³/day. The influent BOD5 is 250 mg/L and the activated sludge is designed to remove 90% of BOD5. (**Biomass wasting directly from the aeration basin) Pertinent data: Biomass concentration in aeration basin = 2000 mg/L Biomass concentration in the effluent = 20 mg/L Waste flow rate = 250 m³/day (biomas wasted directly from the aeration basin) kd = 0.01 d-¹ (a) Calculate the MCRT of the process. (b) Determine the yield coefficient, Y. (c) If the recycle ratio is 0.5 (i.e., QR = 50% of Q), calculate biomass concentration in recycled activated sludge, XR. (Assume: influent biomass, X = 0)
Transcribed Image Text:An activated sludge process with an aeration basin of 4,000 m³ is treating a wastewater flow of 7,500 m³/day. The influent BOD5 is 250 mg/L and the activated sludge is designed to remove 90% of BOD5. (**Biomass wasting directly from the aeration basin) Pertinent data: Biomass concentration in aeration basin = 2000 mg/L Biomass concentration in the effluent = 20 mg/L Waste flow rate = 250 m³/day (biomas wasted directly from the aeration basin) kd = 0.01 d-¹ (a) Calculate the MCRT of the process. (b) Determine the yield coefficient, Y. (c) If the recycle ratio is 0.5 (i.e., QR = 50% of Q), calculate biomass concentration in recycled activated sludge, XR. (Assume: influent biomass, X = 0)
Influent Biomass Wasting Biomass recirculation Effluent
Transcribed Image Text:Influent Biomass Wasting Biomass recirculation Effluent
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