You are investigating the water quality of a river with an average velocity of 30 m/min and a sewage discharge which impacts the dissolved oxygen in the river. It is linear and regular for a length of 100 miles, except there is a small waterfall 10 miles downstream of discharge. At the waterfall, the oxygen deficit falls back to zero. The load to the river is 20 mg/L. The de-oxygenation rate coefficient (kj) is 0.3 day and the re-aeration rate coefficient (k,) is 0.5 day'. If the initial oxygen deficit is 0 mg/L and oxygen saturation is 8 mg/L, what is the minimum concentration seen in the river?
You are investigating the water quality of a river with an average velocity of 30 m/min and a sewage discharge which impacts the dissolved oxygen in the river. It is linear and regular for a length of 100 miles, except there is a small waterfall 10 miles downstream of discharge. At the waterfall, the oxygen deficit falls back to zero. The load to the river is 20 mg/L. The de-oxygenation rate coefficient (kj) is 0.3 day and the re-aeration rate coefficient (k,) is 0.5 day'. If the initial oxygen deficit is 0 mg/L and oxygen saturation is 8 mg/L, what is the minimum concentration seen in the river?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
![You are investigating the water quality of a
river with an average velocity of 30 m/min
and a sewage discharge which impacts the
dissolved oxygen in the river. It is linear
and regular for a length of 100 miles,
except there is a small waterfall 10 miles
downstream of discharge. At the waterfall,
the oxygen deficit falls back to zero. The
load to the river is 20 mg/L. The
de-oxygenation rate coefficient (kj) is 0.3
day' and the re-aeration rate coefficient
(k.) is 0.5 day'. If the initial oxygen deficit
is 0 mg/L and oxygen saturation is 8 mg/L,
what is the minimum concentration seen in
the river?
Answer: 2.78 mg/L](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F354f0f07-4e58-4740-9109-f710361ed65f%2F0e1ef71a-e1ca-4a40-933b-bf361e09906b%2Fnh9cngk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:You are investigating the water quality of a
river with an average velocity of 30 m/min
and a sewage discharge which impacts the
dissolved oxygen in the river. It is linear
and regular for a length of 100 miles,
except there is a small waterfall 10 miles
downstream of discharge. At the waterfall,
the oxygen deficit falls back to zero. The
load to the river is 20 mg/L. The
de-oxygenation rate coefficient (kj) is 0.3
day' and the re-aeration rate coefficient
(k.) is 0.5 day'. If the initial oxygen deficit
is 0 mg/L and oxygen saturation is 8 mg/L,
what is the minimum concentration seen in
the river?
Answer: 2.78 mg/L
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