EXAMPLE 7.4 SI Aerated Grit Chamber A municipal wastewater treatment plant has an average flow of 0.473 m/s. and two aerated grit chambers, are to be designed. Dual units are to be provided for flexibility in operation, since one could be used should the other require temporary maintenance. During normal operation, both cham- bers would be used. Each chamber is to be a rectangular tank with spiral- roll flow. The peak flow is 2.29 times the average flow. The tank width is 1.5 times the depth, and the length is 4.0 times the width. Determine: 1. The theoretical dimensions of the tanks, in meters, if the detention time is 3 min. 2. The total air flow in m/min, if 0.3 m/min per meter of tank length is to be provided.

Structural Analysis
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EXAMPLE 7.4 SI
Aerated Grit Chamber
A municipal wastewater treatment plant has an average flow of 0.473 m/s,
and two aerated grit chambers, are to be designed. Dual units are to be
provided for flexibility in operation, since one could be used should the
other require temporary maintenance. During normal operation, both cham-
bers would be used. Each chamber is to be a rectangular tank with spiral-
roll flow. The peak flow is 2.29 times the average flow. The tank width is 1.5
times the depth, and the length is 4.0 times the width. Determine:
1. The theoretical dimensions of the tanks, in meters, if the detention
time is 3 min.
2. The total air flow in m'/min, if 0.3 m/min per meter of tank length is
to be provided.
Transcribed Image Text:EXAMPLE 7.4 SI Aerated Grit Chamber A municipal wastewater treatment plant has an average flow of 0.473 m/s, and two aerated grit chambers, are to be designed. Dual units are to be provided for flexibility in operation, since one could be used should the other require temporary maintenance. During normal operation, both cham- bers would be used. Each chamber is to be a rectangular tank with spiral- roll flow. The peak flow is 2.29 times the average flow. The tank width is 1.5 times the depth, and the length is 4.0 times the width. Determine: 1. The theoretical dimensions of the tanks, in meters, if the detention time is 3 min. 2. The total air flow in m'/min, if 0.3 m/min per meter of tank length is to be provided.
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