Homework Help is Here – Start Your Trial Now!
Engineering
Civil Engineering
(c) At the location 15 km downstream of the effluent discharge, how much oxygen (k8/d) would have to be added to have the DO at 7.0 mg/L?

(c) At the location 15 km downstream of the effluent discharge, how much oxygen (k8/d) would have to be added to have the DO at 7.0 mg/L?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
See similar textbooks
icon
Related questions
Question

What is the ultimate BOD 24 km downstream from the outfall?

> Answer: 3.89 g/m3

What is the DO deficit 24 km downstream of the effluent discharge?

> Answer: 3.192 g/m3

Question: At the location 15 km downstream of the effluent discharge, how much oxygen would have to be added to have the do at 7 mg/l?

1. A river has an upstream flow of 2.27 m3/s, an ultimate BOD of 5 mg/L, and a DO of 6 mg/L. An effluent enters the river with a flow of 0.283 m/s, a 5-d BOD of 20 mg/L, and a DO of zero. A long-term CBOD test on the effluent has indicated a BOD decay constant of 0.25 d-1, and there is negligible BOD removal by sedimentation. DO saturation in the river is 8.26 mg/L at a temperature of 25 °C. The CBOD decay rate in the river is 0.6 d- at 25 °C, the velocity is 25 cm/s, and the depth is 1.78 m. (Chin, 3rd ed., Problem 4.36) (a) What is the ultimate BOD 24 km downstream from the outfall? (b) What is the DO deficit 24 km downstream of the effluent discharge? (c) At the location 15 km downstream of the effluent discharge, how much oxygen (k8/a) would have to be added to have the DO at 7.0 mg/L? (d) Is it possible to reduce the BOD of the effluent to maintain the DO above 7.0 mg/L at all downstream locations along the river? If so, what is the target BOD of the effluent?
Transcribed Image Text:1. A river has an upstream flow of 2.27 m3/s, an ultimate BOD of 5 mg/L, and a DO of 6 mg/L. An effluent enters the river with a flow of 0.283 m/s, a 5-d BOD of 20 mg/L, and a DO of zero. A long-term CBOD test on the effluent has indicated a BOD decay constant of 0.25 d-1, and there is negligible BOD removal by sedimentation. DO saturation in the river is 8.26 mg/L at a temperature of 25 °C. The CBOD decay rate in the river is 0.6 d- at 25 °C, the velocity is 25 cm/s, and the depth is 1.78 m. (Chin, 3rd ed., Problem 4.36) (a) What is the ultimate BOD 24 km downstream from the outfall? (b) What is the DO deficit 24 km downstream of the effluent discharge? (c) At the location 15 km downstream of the effluent discharge, how much oxygen (k8/a) would have to be added to have the DO at 7.0 mg/L? (d) Is it possible to reduce the BOD of the effluent to maintain the DO above 7.0 mg/L at all downstream locations along the river? If so, what is the target BOD of the effluent?
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Water withdrawal
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Structural Analysis
Structural Analysis
Civil Engineering
ISBN:
9781337630931
Author:
KASSIMALI, Aslam.
Publisher:
Cengage,
Structural Analysis (10th Edition)
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Sustainable Energy
Sustainable Energy
Civil Engineering
ISBN:
9781337551663
Author:
DUNLAP, Richard A.
Publisher:
Cengage,
Traffic and Highway Engineering
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS