Discharge of waste water from a pulp mill results in an oxygen sag minimum value of 3.2 mg/L. At the point of discharge the river has a saturated DO value of 9 mg/L. The pulp mill isthe only source of BOD to the river. Given a river velocity of 2 m/s, an average depth of 5 m and kd of 0.22/day, calculate:the percent reduction of the BOD in the waste water to ensure a healthy river with > 5mg / L everywhere.the downstream distance that the DO minimum occursthe ultimate BOD of the river waste water mixture at discharge point so that DO minimum si 5 mg/L.

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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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Discharge of waste water from a pulp mill results in an oxygen sag minimum value of 3.2 mg/L. At the point of discharge the river has a saturated DO value of 9 mg/L. The pulp mill isthe only source of BOD to the river. Given a river velocity of 2 m/s, an average depth of 5 m and kd of 0.22/day, calculate:

the percent reduction of the BOD in the waste water to ensure a healthy river with > 5mg / L everywhere.
the downstream distance that the DO minimum occurs
the ultimate BOD of the river waste water mixture at discharge point so that DO minimum si 5 mg/L.

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