2. A river with a flow of 0.06 m³/s and velocity 0.1 m/s and BOD 0 mg/L and saturated with DO at 9.17 mg/L is to receive 0.021 m³/s of wastewater with a DO of 3 mg/L from a treatment plant. If it required that the DO at a point 27 km downstream should have 90% dissolve oxygen saturation compute the maximum BOD, that may be discharged into the River. Assume 20°C temperature for both the river and the stream and K’ and K₂ constants of 0.23 and 0.7 d-1 respectively. Dt tc= = K'Lo (e-kt-e-kat) (K', -K') 2 1 K₂ - K 24 | + {1- K' -loge + Doe-k₂t Do(K₂- - K K Lo " Dc= K K₂ Loe-Kr
2. A river with a flow of 0.06 m³/s and velocity 0.1 m/s and BOD 0 mg/L and saturated with DO at 9.17 mg/L is to receive 0.021 m³/s of wastewater with a DO of 3 mg/L from a treatment plant. If it required that the DO at a point 27 km downstream should have 90% dissolve oxygen saturation compute the maximum BOD, that may be discharged into the River. Assume 20°C temperature for both the river and the stream and K’ and K₂ constants of 0.23 and 0.7 d-1 respectively. Dt tc= = K'Lo (e-kt-e-kat) (K', -K') 2 1 K₂ - K 24 | + {1- K' -loge + Doe-k₂t Do(K₂- - K K Lo " Dc= K K₂ Loe-Kr
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:2. A river with a flow of 0.06 m³/s and velocity 0.1 m/s and
BOD 0 mg/L and saturated with DO at 9.17 mg/L is to
receive 0.021 m³/s of wastewater with a DO of 3 mg/L
from a treatment plant. If it required that the DO at a point
27 km downstream should have 90% dissolve oxygen
saturation compute the maximum BOD, that may be
discharged into the River. Assume 20°C temperature for
both the river and the stream and K' and K₂ constants of
0.23 and 0.7 d-1 respectively.
5
Dt
tc =
=
K'Lo (e-kt - e-kat)
е
1
-
K₂ - K
(K', - K')
2
+ Doe-k₂t
K₂
of A² / ₁- DOCK; - K
K Lo
loge
"
Dc =
K
K₂
Loe-Ki
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