ASCE Standard ASCE/EWRI 2-06 Measurement of Oxygen Transfer in Clean Water

CONTENTS

Standards iii

Foreword v

Acknowledgments vi

1.0 SCOPE 1

2.0 SUMMARY OF METHOD 1

3.0 SIGNIFICANCE AND LIMITATIONS 1

4.0 DEFINITIONS AND NOMENCLATURE 2

4.1 OXYGEN TRANSFER RATE 2

4.2 STANDARD OXYGEN TRANSFER RATE 2

4.3 AERATION EFFICIENCY 2

4.4 STANDARD AERATION EFFICIENCY 2

4.5 OXYGEN TRANSFER EFFICIENCY 2

4.6 STANDARD OXYGEN TRANSFER EFFICIENCY 2

5.0 APPARATUS AND METHODS 2

5.1 TANK 2

5.2 WATER 2

5.3 OXYGENATION DEVICE 2

5.4 SAMPLING DEVICES 2

5.5 DISSOLVED OXYGEN MEASUREMENT 3

5.6 TEMPERATURE MEASUREMENT 3

5.7 DEOXYGENATION CHEMICALS 3

5.7.1 Sodium Sulfite 3

5.7.2 Cobalt Catalyst 3

5.8 COMPUTER OR CALCULATOR 3

5.9 GAS FLOW MEASUREMENT APPARATUS 3

5.10 POWER MEASUREMENT APPARATUS 3

6.0 PROCEDURE 3

6.1 ADVANCE PREPARATION AND RESPONSIBILITIES 3

6.2 TEST TANK GEOMETRY AND AERATOR PLACEMENT 4

6.3 WATER QUALITY 4

6.3.1 General and Total Dissolved Solids 4

6.3.2 Temperature 4

6.3.3 Water Quality Analyses 5

6.4 SYSTEM STABILITY 5

6.5 INITIAL TEST 5

6.6 DEOXYGENATION CHEMICALS 6

6.7 ADDITION OF DEOXYGENATION CHEMICALS 6

6.7.1 Cobalt Addition 6

6.7.2 Sulfite Addition 6

6.8 DETERMINATION OF DISSOLVED OXYGEN AT VARIOUS POINTS IN

THE TANK DURING THE UNSTEADY-STATE TEST 6

6.8.1 Location of Dissolved Oxygen Determination Points 7

6.8.2 Collection of Pumped Samples 7

6.8.3 Times of Dissolved Oxygen Determinations 7

6.8.4 Test Duration and Dissolved Oxygen Saturation 8

6.9 DISSOLVED OXYGEN MEASUREMENTS 8

6.9.1 Measurements by In Situ and Sample Line DO Probes 8

6.9.2 Measurement by Probes in BOD Bottles 8

6.9.3 Measurements by the Winkler Procedure 9

7.0 DATA ANALYSIS 9

7.1 PREPARATION OF DATA FOR ANALYSIS 9

7.2 PARAMETER ESTIMATION 9

7.2.1 Nonlinear Regression Method 9

8.0 INTERPRETATION AND REPORTING OF RESULTS 9

8.1 STANDARD OXYGEN TRANSFER RATE 9

8.2 SPATIAL UNIFORMITY AND REPRODUCIBILITY OF KLa AND

C*x20 VALUES 10

8.2.1 Spatial Variation KLa20 and C*x20 Values Related to Mixing and

Data Adequacy 10

8.2.2 Reproducibility Point KLa20 Values as a Criterion of Validity 11

8.3 STANDARD AERATION EFFICIENCY 11

8.4 OXYGEN TRANSFER EFFICIENCY 11

8.5 PERFORMANCE EVALUATION CRITERIA 11

9.0 REPORTING 11

REFERENCES 12

Annexes

ANNEX A 13

ANNEX B 15

ANNEX C 17

ANNEX D 17

ANNEX E 20

ANNEX F 21

ANNEX G 21

Commentary

COMMENTARY A 22

COMMENTARY B 24

COMMENTARY C 25

COMMENTARY D 25

COMMENTARY E 26

COMMENTARY F 26

COMMENTARY G 27

COMMENTARY H 29

INDEX 31