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BS EN 12255-15:2003

Current
Current

The latest, up-to-date edition.

Wastewater treatment plants Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

12-17-2003

Publisher

British Standards Institution

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
  6.3 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

Covers the non-steady state measurement of the oxygen transfer rate and the oxygen transfer efficiency of aeration systems in activated sludge aeration tanks (see EN 12255-6) when filled with clean water.

This part of this European standard specifies the non-steady state measurement of the oxygen transfer capacity and the oxygen transfer efficiency of aeration tanks (see prEN 12255-6) when filled with clean water. NOTE 1: This is known as the clean water test. NOTE 2: Since the method is based on completely mixed tanks or tanks with evenly distributed aerators or diffusers it may not be applicable for certain aeration installations. NOTE 3: Under process conditions with mixed liquor the oxygen transfer capacity and the oxygen transfer efficiency may be different from the clean water test results.

Committee
B/505
DevelopmentNote
Supersedes 99/109590 DC (12/2003)
DocumentType
Standard
Pages
20
PublisherName
British Standards Institution
Status
Current
Supersedes

EN 25814 : 1992 METHOD FOR DETERMINATION OF DISSOLVED OXYGEN IN WATER: ELECTROTECHNICAL PROBE METHOD
EN 12255-6:2002 Wastewater treatment plants - Part 6: Activated sludge process
EN 752-6 : 1998 DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PUMPING INSTALLATIONS
ISO 5814:2012 Water quality — Determination of dissolved oxygen — Electrochemical probe method
EN 25813 : 1992 WATER QUALITY - DETERMINATION OF DISSOLVED OXYGEN - IODOMETRIC METHOD
EN 1085:2007 Wastewater treatment - Vocabulary

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