The PEF, Inc. firm desires to utilize a complete-mix activated-sludge system with recycle to treat their municipal wastewater after primary sedimentation. The design parameters are: Flow rate=0.92m³/s Influent Soluble BOD5 = 292mg/L MLVSS=2,500mg/L Mean cell residence time = 7.24 d For any missing parameters, use typical values of growth constants for domestic wastewater (provided in your text, page 494). Assume that the solids lost in the secondary clarifier effluent are minor and can be neglected. Assuming a BOD, (S) concentration of 24 mg/L, the detention time (residence time or theta) in the activated sludge system is most nearly:

The PEF, Inc. firm desires to utilize a complete-mix activated-sludge system with recycle to treat their municipal wastewater after primary sedimentation. The design parameters are: Flow rate=0.92m³/s Influent Soluble BOD5 = 292mg/L MLVSS=2,500mg/L Mean cell residence time = 7.24 d For any missing parameters, use typical values of growth constants for domestic wastewater (provided in your text, page 494). Assume that the solids lost in the secondary clarifier effluent are minor and can be neglected. Assuming a BOD, (S) concentration of 24 mg/L, the detention time (residence time or theta) in the activated sludge system is most nearly:

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

The PEF, Inc. firm desires to utilize a complete-mix activated-sludge system with recycle to treat
their municipal wastewater after primary sedimentation. The design parameters are:
Flow rate=0.92m³/s
Influent Soluble BOD5 = 292mg/L
MLVSS=2,500mg/L
Mean cell residence time = 7.24 d
For any missing parameters, use typical values of growth constants for domestic wastewater
(provided in your text, page 494). Assume that the solids lost in the secondary clarifier effluent are
minor and can be neglected.
Assuming a BODs (S) concentration of 24 mg/L, the detention time (residence time or theta) in the
activated sludge system is most nearly:
O 28 hours
O 6.5 hours
O 168 hours
O 53 hours

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