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.

Structural Analysis
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Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
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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.
Transcribed Image Text: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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