Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 4P
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Why is proper planning important when developing a baseline construction project schedule?
Determine the minimum possible surface area of a secondary clarifier treating
activated sludge with a design influent flow rate (Q) of 1,000 m³/d, a return
activated sludge (RAS) recycling ratio of 25%, and a mixed liquor total
suspended solids (MLSS) concentration of 4,000 mg/L, if the overflow rate must
be less than 33 m/d and the solids loading rate must be less than 250 kg/m²/d.
Express your answer in m² and round up to the next integer.
Estimate the required air flow rate for the new activated sludge plant at Pea Ridge (Problems
23-223-723-10, and 23-13). The flow rate is 8,450 m³/day, the concentration
of bCOD going into the system (So) is 137 mg/L, the concentration of bCOD leaving the
system (S) is 16.3 mg/L, and the mass of cells produced per day (Pxvss) is 277.4 kg/d. Use the
following assumptions to estimate the required air flow rate:
. Clean water correction, a = 0.50
. Salinity correction, B = 0.95
Fouling factor = 0.9
Wastewater temperature = 12°C
Atmospheric pressure = 101.325 kPa
.Elevation 500 m
.
Depth of aerator = 5.6 m
Operating DO 2.0 mg/L
Percent oxygen leaving aeration tank - 19%
■ Manufacturer's SOTR = 535 kg/d
Manufacturer's air flow rate at standard conditions 50 m³/d - aerator
Express your answer with the units of m³/d and round to the nearest integer.
Chapter 8 Solutions
Traffic and Highway Engineering
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10P
Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Prob. 17PCh. 8 - Prob. 18PCh. 8 - Prob. 19PCh. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - Prob. 25PCh. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - Prob. 28P
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