DIN EN 12255-15 E : 2004
Current
The latest, up-to-date edition.
WASTEWATER TREATMENT PLANTS - PART 15: MEASUREMENT OF THE OXYGEN TRANSFER IN CLEAN WATER IN AERATION TANKS OF ACTIVATED SLUDGE PLANTS
Hardcopy , PDF
English
01-01-2004
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Principle and procedures
6 Aeration tanks, test-water, equipment and chemicals
6.1 Aeration tanks and aeration installations
6.2 Measuring equipment
6.2.1 Dissolved oxygen probes (DO probes)
6.2.2 Recording of the dissolved oxygen concentration
6.2.3 Temperature measurement
6.2.4 Power measurement
6.2.5 Air flow measurement
6.3 Chemicals
6.3.1 Sodium sulphite
6.3.2 Cobalt catalyst
6.3.3 Nitrogen and pure oxygen gas
6.4 Test-water
7 Procedure
7.1 Planning of testing
7.2 Advance preparation and responsibilities
7.3 Filling of the tank with test-water
7.4 Installation of the DO probes
7.5 Addition of chemicals
7.5.1 Cobalt catalyst
7.5.2 Sodium sulphite
7.6 Gas injection
7.7 Data collection during a test
7.8 Data analysis
8 Precision and accuracy of results
8.1 Standard oxygen transfer rate
8.2 Standard aeration efficiency
8.3 Specific standard oxygen transfer efficiency
9 Presentation and interpretation of the results
Annex A (normative) Alternative test and evaluation procedure
A.1 Principle
A.2 Measurement of the oxygen saturation value
A.3 In-situ calibration of the DO probes
A.4 Determination of the oxygen transfer coefficient
Bibliography
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