A factory is discharging its wastewater into a slowly moving stream that has a mean velocity of 3 cm/s. The flow rate of the stream is 4 times as that of the wastewater. The ultimate BOD of stream and wastewater are 5 mg/L and 105 mg/L, respectively. And DO of the stream and wastewater are 6 mg/L and 1 mg/L, respectively. The temperatures of the stream and wastewater are 15oC. The deoxygenation rate at 15oC is 0.48 day-1, and the re-aeration rate at 15oC is 0.72 day-1. Draw a DO sag curve using Microsoft Excel.Based on your DO sag curve, find the location of and travel time to the critical point, and determine the minimum DOA type of local fish requires the minimum DO in the river above 2 mg/L. Please evaluate whether the actual minimum DO is acceptable. If not, please qualitatively and quantitatively select appropriate management strategies to allow water quality to reach the quality requirements. And determine the location of and travel time to the new critical point, and the new minimum DO. Discharge from a WWTP:DO= 1 mg/LLa = 105 mg/LFlowrate = QUpstream of a river:DO= 6 mg/LLa = 5 mg/LWater velocity: V = 3 cm/s;Deoxygenation rate=0.48 day1;Re-aeration rate = 0.72 day1Flowrate = 4Q%3D

Answered: A factory is discharging its wastewater…

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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A factory is discharging its wastewater into a slowly moving stream that has a mean velocity of 3 cm/s. The flow rate of the stream is 4 times as that of the wastewater. The ultimate BOD of stream and wastewater are 5 mg/L and 105 mg/L, respectively. And DO of the stream and wastewater are 6 mg/L and 1 mg/L, respectively. The temperatures of the stream and wastewater are 15^oC. The deoxygenation rate at 15^oC is 0.48 day^-1, and the re-aeration rate at 15^oC is 0.72 day^-1.

Draw a DO sag curve using Microsoft Excel.
Based on your DO sag curve, find the location of and travel time to the critical point, and determine the minimum DO
A type of local fish requires the minimum DO in the river above 2 mg/L. Please evaluate whether the actual minimum DO is acceptable. If not, please qualitatively and quantitatively select appropriate management strategies to allow water quality to reach the quality requirements. And determine the location of and travel time to the new critical point, and the new minimum DO.

Discharge from a WWTP:
DO= 1 mg/L
La = 105 mg/L
Flowrate = Q
Upstream of a river:
DO= 6 mg/L
La = 5 mg/L
Water velocity: V = 3 cm/s;
Deoxygenation rate=0.48 day1;
Re-aeration rate = 0.72 day1
Flowrate = 4Q
%3D

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