3. Sewage with a fecal coliform bacteria count of 8x 10° CFUS / 100 mL is leaking into a river at a rate of 0.1 m/s. Upstream of the leak, the river flow is 100 m/s and the fecal coliform bacteria count is 40 CFUS / 100 ml. The average velocity in the river is given as 0.25 m /s and the bacteria die-off rate is given as 2.4 /d. a. Write the mass balance equation for fecal coliform bacteria at the discharge point of the and downstream of the discharge. • See pdf O Not sure how to proceed b. Determine the fecal coliform concentration at a public beach 10 km downstream of the leak. CFUS / 100 ml e Will the New York State fecal coliform bathing standard of 200 CFUS /100 ml be met? O Yes O No Check

3. Sewage with a fecal coliform bacteria count of 8x 10° CFUS / 100 mL is leaking into a river at a rate of 0.1 m/s. Upstream of the leak, the river flow is 100 m/s and the fecal coliform bacteria count is 40 CFUS / 100 ml. The average velocity in the river is given as 0.25 m /s and the bacteria die-off rate is given as 2.4 /d. a. Write the mass balance equation for fecal coliform bacteria at the discharge point of the and downstream of the discharge. • See pdf O Not sure how to proceed b. Determine the fecal coliform concentration at a public beach 10 km downstream of the leak. CFUS / 100 ml e Will the New York State fecal coliform bathing standard of 200 CFUS /100 ml be met? O Yes O No Check

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Poorly treated municipal wastewater is discharged to a stream. The river flow rate upstream of the discharge point is Qus = 8.7 cubic meters per second. The discharge occurs at a flow of Qd = 0.9 cubic meters per second and has a BOD concentration of 50 mg/L. Assuming that the upstream BOD concentration is negligible. (a) What is the BOD concentration just downstream of the discharge point, after mixing? (b) If the stream has a cross-sectional area of 10 square meters, what would the BOD concentration be 50 km downstream? BOD is removed with a first-order decay rate constant equal to 0.20/day.
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