The City of Marietta has been directed by the City Board to upgrade its primary Wastewater Treatment Plant (WWTP) to include a secondary treatment process that can meet an effluent standard of 20 mg/L of BODs and 20 mg/L of suspended solids (SS). They want to select completely mixed activated sludge system. The BOD5 of the SS is estimated to be 50% of the SS concentration. Assume L:W within 4:1 and maximum depth of 4.5 m and maximum length of 50 m for the tank. Assume the reasonable
The City of Marietta has been directed by the City Board to upgrade its primary Wastewater Treatment Plant (WWTP) to include a secondary treatment process that can meet an effluent standard of 20 mg/L of BODs and 20 mg/L of suspended solids (SS). They want to select completely mixed activated sludge system. The BOD5 of the SS is estimated to be 50% of the SS concentration. Assume L:W within 4:1 and maximum depth of 4.5 m and maximum length of 50 m for the tank. Assume the reasonable
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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The City of Marietta has been directed by the City Board to upgrade its primary
Wastewater Treatment Plant (WWTP) to include a secondary treatment process that can meet an effluent standard of 20 mg/L of BODs and 20 mg/L of suspended solids
(SS). They want to select completely mixed activated sludge system. The BOD5 of the SS is estimated to be 50% of the SS concentration. Assume L:W within 4:1 and maximum depth of 4.5 m and maximum length of 50 m for the tank. Assume the reasonable values of missing parameters from FE Exam Handbook.
The effluent characteristics from the primary
treatment process are: Flow = 0.150
m's, BOD5
=75 mg/L. Assume the values for the growth
constants as K, = 100 mg/L BOD5, Mm
= 2.5 d-1, kg
= 0.05 d'1. Y = 0.50 mg VSS/mg BODs removed, MLVSS
= 2,800 mg/L, MISS - 1.20
(MLVSS), wastewater temperature = 25.0°C. Assume 8% 02 transfer rate and BOD5 to BODu ratio as f = 68%. If SRT (qc) = 14.5 days,
the volume of the aeration tank is nearly?
Transcribed Image Text:1) 660 m³
2) 790 m³
3) 1,360 m³
3)
4)
4) 2,060 m³
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