Page 1 of 11

SOLUTIONS MANUAL

Wastewater Engineering:

Treatment and Resource Recovery

Fifth Edition

McGraw-Hill Book Company, Inc.

New York

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v

CONTENTS

1. Wastewater Engineering: An Overview 1-1

2. Constituents in Wastewater 2-1

3. Wastewater Flowrates and Constituent Loadings 3-1

4. Process Selection and Design Considerations 4-1

5. Physical Processes 5-1

6. Chemical Processes 6-1

7. Fundamentals of Biological Treatment 7-1

8. Suspended Growth Biological Treatment Processes 8-1

9. Attached Growth and Combined Biological Treatment

Processes

9-1

10. Anaerobic Suspended and Attached Growth Biological

Treatment Processes

10-1

11. Separation Processes for Removal of Residual Constituents 11-1

12. Disinfection Processes 12-1

13. Processing and Treatment of Sludges 13-1

14. Ultimate and Reuse of Biosolids 14-1

15. Treatment of Return Flows and Nutrient Recovery 15-1

16. Treatment Plant Emissions and Their Control 16-1

17. Energy Considerations in Wastewater Management 17-1

18. Wastewater Management: Future Challenges and

Opportunities

18-1

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Page 3 of 11

iii

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Page 4 of 11

1-1

1

INTRODUCTION TO

WASTEWATER TREATMENT

PROBLEM 1-1

Instructors Note: The first six problems are designed to illustrate the

application of the mass balance principle using examples from hydraulics with

which the students should be familiar.

Problem Statement - See text, page 53

Solution

1. Write a materials balance on the water in the tank

Accumulation = inflow – outflow + generation

dV

dt

dh

dt

A Qin – Qout 0

2. Substitute given values for variable items and solve for h

dh

dt

A 0.2 m3

/ s – 0.2 1 cos

St

43,200

§

©

̈

·

1

̧ m

3

/ s

A = 1000 m2

3. dh 2x104

cos

St

43,200

§

©

̈

·

1

̧

dt

Integrating the above expression yields:

h ho

(43,200) (2x104

)

S

a

¬

«

«

o

1⁄4

»

»

sin St

43,200

§

©

̈

·

1

̧

4. Determine h as a function of time for a 24 hour cycle

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