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.

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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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Integrated Solid Waste Management

Integrated Solid Waste Management (ISWM) is a thorough waste suppression, compost, removal and recycling Program. An effective ISWM system considers how to suppress, manage and recycle solid waste in a manner that is most efficiently to protect human health and the surrounding. ISWM system requires evaluation of public wants and demands and then selecting and merging the most effective waste management activities for the proposed demands. The main ISWM activities for solid waste management are Waste prevention, Recycling and Composting, and Combustion and Removal and waste collection in a properly planned, constructed, managed and mitigated landfill areas. Each of these requires careful designing, financing, accumulation, and delivery of activities.

Question

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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