A wastewater treatment plant (WWTP) releases effluent into a stream with mean depth 2 m and mean velocity 0.5 m/s. The BOD concentration at the WWTP is 15 mg/L, and the oxygen deficit is negligible. The de-oxygenation rate in the stream is 0.8 d-1 and the re-aeration rate is 1.2 d-1. a) Calculate the BOD concentration 20 km downstream from the WWTP. b) Calculate the D.O. deficit 20 km downstream from the WWTP. c) Define "critical distance" in the context of river pollution modeling and compute it for this example.

A wastewater treatment plant (WWTP) releases effluent into a stream with mean depth 2 m and mean velocity 0.5 m/s. The BOD concentration at the WWTP is 15 mg/L, and the oxygen deficit is negligible. The de-oxygenation rate in the stream is 0.8 d-1 and the re-aeration rate is 1.2 d-1. a) Calculate the BOD concentration 20 km downstream from the WWTP. b) Calculate the D.O. deficit 20 km downstream from the WWTP. c) Define "critical distance" in the context of river pollution modeling and compute it for this example.

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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