QUESTION 4 A wastewater treatment plant discharges 1.10 m³/s of treated effluent having an ultimate BOD of 50.0 mg/L into a stream that has a flow of 8.70 m³/s and a BOD of its own equal to 6.0 mg/L. Assume complete and instantaneous mixing at the discharge. DO at the discharge is 7.6 mg/L. The saturated DO is 9.1 mg/L. The stream has a constant cross section with a depth of 3.0 m and a width of 10.9 m. Deoxygenation rate constant kd = 0.20/day. What is the critical (lowest) dissolved oxygen concentration in the river? O A. 12 mg/L O B. 9 mg/L O C. 6 mg/L O D. 1 mg/L

QUESTION 4 A wastewater treatment plant discharges 1.10 m³/s of treated effluent having an ultimate BOD of 50.0 mg/L into a stream that has a flow of 8.70 m³/s and a BOD of its own equal to 6.0 mg/L. Assume complete and instantaneous mixing at the discharge. DO at the discharge is 7.6 mg/L. The saturated DO is 9.1 mg/L. The stream has a constant cross section with a depth of 3.0 m and a width of 10.9 m. Deoxygenation rate constant kd = 0.20/day. What is the critical (lowest) dissolved oxygen concentration in the river? O A. 12 mg/L O B. 9 mg/L O C. 6 mg/L O D. 1 mg/L

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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