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Table of Contents

In: Science

Submitted By fong123
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Chapter 4
TABLE OF CONTENTS

Dissolved Oxygen Measurement

Page

Section 1: Dissolved Oxygen (DO) Introduction 2
Section 2: Glossary 2
Section 3: Approved Methods 3
Section 4: Safety and Hygiene 3-4
Section 5: Sampling 4-5
Section 6: Effects of Temperature on DO 5
Section 7: Interpretations 5
Quiz 4.1 6
Section 8: Modified Winkler Method 6-9
Quiz 4.2 9
Section 9: The Electrometric Meter Method 9-11
Quiz 4.3 12
Section 10: QA/QC 12
Answers to Quizzes 13-14
Appendix A: References
Appendix B: Dissolved Oxygen Reagents
Appendix C: Sample Bench Sheets

Chapter 4

DISSOLVED OXYGEN MEASUREMENT

Section 1 : DISSOLVED OXYGEN (DO) INTRODUCTION

The DO determination measures the amount of dissolved (or free) oxygen present in water or wastewater. Aerobic bacteria and aquatic life such as fish must have DO to survive. Aerobic wastewater treatment processes use aerobic and facultative bacteria to break down the organic compounds found in wastewater into more stable products that will not harm the receiving waters. Wastewater treatment facilities such as lagoons or ponds, trickling filters and activated sludge plants depend on these aerobic bacteria to treat sewage.

The same type of aerobic wastewater treatment process occurs naturally in streams and ponds if organic matter is present, turning these bodies of water into “aerobic wastewater treatment plants.” If sufficient oxygen is not naturally supplied through wind and turbulence to replace the depleted oxygen, the body of water will develop a low DO and become anaerobic (or septic). The results of septic water bodies include fish kills and anaerobic odors.

If the amount of free or DO present in the wastewater process becomes too low, the aerobic bacteria that normally treat the sewage will die. The process will not operate efficiently and septic conditions will occur.

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