ENVIRONMENTAL ENGINEERING, WATER POLLUTION:Suppose the only source of BOD in a river is untreated wastes that are being discharged from a food processing plant. The resulting oxygen sag curve has a minimum value of DO, somewhere downstream equal to 3.0 mg/L (see attached figure). Just below the discharge point, the DO of the stream is equal to 10.0 mg/L.FIND:By what percent should the BOD of the wastes be reduced to assure a healthy stream with at least 5.0 mg/L everywhere? Would a primary treatment plant be sufficient to achieve this reduction? Sketch the oxygen sag curve before and after the recommended treatment, labeling critical points (DOmin) location and value.If the stream flows 60 miles per day, has a reaeration coefficient kr equal to 0.80/day, and has a deoxygenation coefficient kd of 0.20/day, how har downstream (miles) would the lowest DO occur?What ultimate BOD (L0 mg/L) of the mixture of the river and wastes just downstream of the discharge point would cause a minimum DO to be 5 mg/L? DO (mg/L)60 mi/daykp=0.80/dkd 0.20/dDOsat10.03.0FIGURE P5.27

Find the percentage of BOD removed for a healthy stream:Given:The saturated dissolved oxygen of the…

Answered: DO (mg/L) 60 mi/day kp=0.80/d kd 0.20/d…

Structural Analysis

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Author:KASSIMALI, Aslam.

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Chapter2: Loads On Structures

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ENVIRONMENTAL ENGINEERING, WATER POLLUTION:

Suppose the only source of BOD in a river is untreated wastes that are being discharged from a food processing plant. The resulting oxygen sag curve has a minimum value of DO, somewhere downstream equal to 3.0 mg/L (see attached figure). Just below the discharge point, the DO of the stream is equal to 10.0 mg/L.

FIND:

By what percent should the BOD of the wastes be reduced to assure a healthy stream with at least 5.0 mg/L everywhere? Would a primary treatment plant be sufficient to achieve this reduction? Sketch the oxygen sag curve before and after the recommended treatment, labeling critical points (DO_min) location and value.
If the stream flows 60 miles per day, has a reaeration coefficient k_r equal to 0.80/day, and has a deoxygenation coefficient k_d of 0.20/day, how har downstream (miles) would the lowest DO occur?
What ultimate BOD (L₀ mg/L) of the mixture of the river and wastes just downstream of the discharge point would cause a minimum DO to be 5 mg/L?

DO (mg/L)
60 mi/day
kp=0.80/d
kd 0.20/d
DOsat
10.0
3.0
FIGURE P5.27

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