An aerated lagoon (a sewage treatment pond that is mixed with air) is being proposed for a small lake com- munity in northern Wisconsin. The lagoon must be designed for the summer population but will operate year-round. The winter population is about half of the summer population. Based on these design assump- tions, the volume of the proposed lagoon is 3420 m³. The daily volume of sewage in the winter is estimated to be 300 m³. In January, the temperature of the lagoon drops to 0°C but it is not yet frozen. If the temperature of the wastewater flowing into the lagoon is 15°C, estimate the temperature of the lagoon at the end of a day. Assume the lagoon is completely mixed and that there are no losses to the atmosphere or the lagoon walls or floor. Also assume that the sewage has a density of 1000 kg m and a specific heat of 4.186 kJ kg K-¹

An aerated lagoon (a sewage treatment pond that is mixed with air) is being proposed for a small lake com- munity in northern Wisconsin. The lagoon must be designed for the summer population but will operate year-round. The winter population is about half of the summer population. Based on these design assump- tions, the volume of the proposed lagoon is 3420 m³. The daily volume of sewage in the winter is estimated to be 300 m³. In January, the temperature of the lagoon drops to 0°C but it is not yet frozen. If the temperature of the wastewater flowing into the lagoon is 15°C, estimate the temperature of the lagoon at the end of a day. Assume the lagoon is completely mixed and that there are no losses to the atmosphere or the lagoon walls or floor. Also assume that the sewage has a density of 1000 kg m and a specific heat of 4.186 kJ kg K-¹

Structural Analysis

6th Edition

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

An acrated lagoon (a sewage treatment pond that is mixed with air) is being proposed for a small lake com-
munity in northern Wisconsin. The lagoon must be designed for the summer population but will operate
year-round. The winter population is about half of the summer population. Based on these design assump-
tions, the volume of the proposed lagoon is 3420 m³. The daily volume of sewage in the winter is estimated
to be 300 m³. In January, the temperature of the lagoon drops to 0°C but it is not yet frozen. If the temperature
of the wastewater flowing into the lagoon is 15°C, estimate the temperature of the lagoon at the end of a day.
Assume the lagoon is completely mixed and that there are no losses to the atmosphere or the lagoon walls or
floor. Also assume that the sewage has a density of 1000 kg m and a specific heat of 4.186 kJ kg K-¹

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