Q1) A city discharge 432000 m³/day of sewage into a river whose flow rate is 1 m/sec. Determine the deficit in oxygen for a distance 25km downstream , Critical DO , Minimum DO, Critical distance.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Q1) A city discharge 432000 m/day of sewage into a river whose flow rate is 1 m/sec.
Determine the deficit in oxygen for a distance 25km downstream, Critical DO , Minimum DO,
Critical distance.
River
Waste
BODŽ0 = 4 mg/l
Temperature = 21 °C
DO=7.5 mg/l
K2200
BODĘ5 = 60 mg/l
Temperature = 26 °C
DO=2.5 mg/l
= 0.23 day-1
0.4 day-1
Velocity of mixing = 0.25 m/sec
K1,200
%3D
Temp.
DO sat
18
20
22
23
24
25
26
9.54
9.17
8.99
8.83
8.53
8.38
8.22
Transcribed Image Text:Q1) A city discharge 432000 m/day of sewage into a river whose flow rate is 1 m/sec. Determine the deficit in oxygen for a distance 25km downstream, Critical DO , Minimum DO, Critical distance. River Waste BODŽ0 = 4 mg/l Temperature = 21 °C DO=7.5 mg/l K2200 BODĘ5 = 60 mg/l Temperature = 26 °C DO=2.5 mg/l = 0.23 day-1 0.4 day-1 Velocity of mixing = 0.25 m/sec K1,200 %3D Temp. DO sat 18 20 22 23 24 25 26 9.54 9.17 8.99 8.83 8.53 8.38 8.22
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