A wastewater treatment use an activated sludge process for secondary treatment of 10000 m3/day for municipal wastewater. After primary clarification, The BOD is 150 mg/L, and it is desired to have not more than 7 mg/L of soluble BOD in the effluent. The mixed liquor has a concentration of 3000 mg/L and underflow solids concentration is 12,000 mg /L from the secondary clarifier. The kinetic constants from a bench scale treatability study are Y=0.5 and Kd=0.05 day-1. Assume the cell residence time is 10 days.Determine:a. The volume of the activated sludge tank & the hydraulic residence time. b. The sludge production rate & the sludge wasting flow rate.c. The sludge recycle ratio and recycle flow rate.d. The organic loading rate. Q/ A wastewater treatment use an activated sludge process for secondary treatmentof 10000 m/day for municipal wastewater. After primary clarification, The BODis 150 mg/L, and it is desired to have not more than 7 mg/L of soluble BOD in theeffluent. The mixed liquor has a concentration of 3000 mg/L and underflow solidsconcentration is 12,000 mg /L from the secondary clarifier. The kinetic constantsfrom a bench scale treatability study are Y=0.5 and K-0.05 day". Assume the cellresidence time is 10 days.Determine:a. The volume of the activated sludge tank & the hydraulic residence time.b. The sludge production rate & the sludge wasting flow rate.c. The sludge recycle ratio and recycle flow rate.d. The organic loading rate.

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Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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A wastewater treatment use an activated sludge process for secondary treatment of 10000 m3/day for municipal wastewater. After primary clarification, The BOD is 150 mg/L, and it is desired to have not more than 7 mg/L of soluble BOD in the effluent. The mixed liquor has a concentration of 3000 mg/L and underflow solids concentration is 12,000 mg /L from the secondary clarifier. The kinetic constants from a bench scale treatability study are Y=0.5 and Kd=0.05 day-1. Assume the cell residence time is 10 days. Determine: a. The volume of the activated sludge tank & the hydraulic residence time. b. The sludge production rate & the sludge wasting flow rate. c. The sludge recycle ratio and recycle flow rate. d. The organic loading rate.

Q/ A wastewater treatment use an activated sludge process for secondary treatment
of 10000 m/day for municipal wastewater. After primary clarification, The BOD
is 150 mg/L, and it is desired to have not more than 7 mg/L of soluble BOD in the
effluent. The mixed liquor has a concentration of 3000 mg/L and underflow solids
concentration is 12,000 mg /L from the secondary clarifier. The kinetic constants
from a bench scale treatability study are Y=0.5 and K-0.05 day". Assume the cell
residence time is 10 days.
Determine:
a. The volume of the activated sludge tank & the hydraulic residence time.
b. The sludge production rate & the sludge wasting flow rate.
c. The sludge recycle ratio and recycle flow rate.
d. The organic loading rate.

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