A city discharges 25 MLD domestic sewage into a stream whose average flow is 185 MLD. The velocity of the stream is 2 km/hr. The temperature of both the stream and sewage is 20 °C. The 20 °C BOD5 of the sewage is 80 mg/L, while that of the stream is 1.2 mg/L. The sewage contains no DO, and the stream is 90% saturated upstream of the discharge. At 20 °C, kl, k2, and saturated oxygen concentration is 0.34 per day, 0.65 per day, and 9.1 mg/L respectively. Find the time and distance downstream at which the oxygen deficit is a maximum.
A city discharges 25 MLD domestic sewage into a stream whose average flow is 185 MLD. The velocity of the stream is 2 km/hr. The temperature of both the stream and sewage is 20 °C. The 20 °C BOD5 of the sewage is 80 mg/L, while that of the stream is 1.2 mg/L. The sewage contains no DO, and the stream is 90% saturated upstream of the discharge. At 20 °C, kl, k2, and saturated oxygen concentration is 0.34 per day, 0.65 per day, and 9.1 mg/L respectively. Find the time and distance downstream at which the oxygen deficit is a maximum.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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![A city discharges 25 MLD domestic sewage into a stream whose
average flow is 185 MLD. The velocity of the stream is 2 km/hr.
The temperature of both the stream and sewage is 20 °C. The 20 °C
BOD5 of the sewage is 80 mg/L, while that of the stream is 1.2
mg/L. The sewage contains no DO, and the stream is 90% saturated
upstream of the discharge. At 20 °C, kl, k2, and saturated oxygen
concentration is 0.34 per day, 0.65 per day, and 9.1 mg/L
respectively.
Find the time and distance downstream at which the oxygen deficit
is a maximum.
Find the minimum value of DO.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4fa86940-03d3-4a9f-87ac-34e605f2b64e%2Fa7528b15-3c7b-49f9-8520-94b292bfb66c%2Fsw9jaer_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A city discharges 25 MLD domestic sewage into a stream whose
average flow is 185 MLD. The velocity of the stream is 2 km/hr.
The temperature of both the stream and sewage is 20 °C. The 20 °C
BOD5 of the sewage is 80 mg/L, while that of the stream is 1.2
mg/L. The sewage contains no DO, and the stream is 90% saturated
upstream of the discharge. At 20 °C, kl, k2, and saturated oxygen
concentration is 0.34 per day, 0.65 per day, and 9.1 mg/L
respectively.
Find the time and distance downstream at which the oxygen deficit
is a maximum.
Find the minimum value of DO.
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