EN 12255-15:2003
(Main)Wastewater treatment plants - Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants
Wastewater treatment plants - Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants
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.
Kläranlagen - Teil 15: Messung der Sauerstoffzufuhr in Reinwasser in Belüftungsbecken von Belebungsanlagen
Diese Europäische Norm legt die Anforderungen zur Messung der Sauerstoffzufuhr und des Sauerstoffertrages von Belüftungseinrichtungen in Belebungsbecken (vergleiche prEN 12255-6) gefüllt mit Reinwasser nach der Absorptions- oder Desorptionsmethode fest. ANMERKUNG 1: Dies ist als Reinwasserversuch bekannt. ANMERKUNG 2: Weil dieses Verfahren auf total durchmischte Becken oder Becken mit gleichmäßiger Belüfterdichte beruht, kann es für bestimmte Belüftungseinrichtungen nicht anwendbar sein.
Stations d'épuration - Partie 15: Mesurage du transfert d'oxygène en eau claire dans les bassins d'aération des stations d'épuration à boues activées
La présente Norme européenne spécifie le mesurage à l'état non stationnaire de l'apport horaire en oxygène, de l'apport spécifique brut et du rendement d'oxygénation des systèmes d'aération équipant les bassins d'aération des stations d'épuration à boues activées (voir l'EN 12255-6) lorsqu'ils sont remplis d'eau claire.
NOTE 1 Cette méthode est connue sous le nom d'essai à l'eau claire.
NOTE 2 Cette méthode n'étant applicable qu'au cas des bassins parfaitement mélangés ou des bassins dans lesquels les aérateurs ou les diffuseurs sont répartis uniformément, il est possible que les résultats d'essais effectués sur certaines installations ne soient pas corrects.
NOTE 3 En conditions réelles de fonctionnement, en présence de boues activées, l'apport horaire en oxygène, l'apport spécifique brut et le rendement d'oxygénation peuvent différer des résultats obtenus lors des essais d'aération en eau claire. Cette différence est exprimée par le facteur a.
Čistilne naprave za odpadno vodo - 15. del: Merjenje vnosa kisika v čisto vodo v aeracijskih bazenih naprav z aktivnim blatom
General Information
- Status
- Published
- Publication Date
- 02-Dec-2003
- Technical Committee
- CEN/TC 165 - Waste water engineering
- Drafting Committee
- CEN/TC 165/WG 40 - Wastewater treatment plants > 50 PT
- Current Stage
- 9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
- Start Date
- 29-Mar-2019
- Completion Date
- 08-Oct-2025
- Directive
- 89/106/EEC - Construction products
Overview - EN 12255-15:2003 (oxygen transfer clean water test)
EN 12255-15:2003 is the CEN European standard that specifies the non‑steady state measurement of oxygen transfer in aeration tanks of activated sludge plants when filled with clean water (the “clean water test”). It defines how to measure and report key performance indicators such as the standard oxygen transfer rate (SOTR), standard aeration efficiency (SAE), specific standard oxygen transfer efficiency (SSOTE) and the oxygen transfer coefficient (kLa) for aeration systems.
Key topics and technical requirements
- Scope & limitations
- Applies to aeration tanks filled with clean water (clean water test).
- Method assumes completely mixed tanks or evenly distributed aerators/diffusers - may be unsuitable for certain installations.
- Results differ from mixed‑liquor (process) conditions; differences are expressed via the a‑factor.
- Test principles
- Non‑steady state absorption (sodium sulphite or nitrogen to lower DO then aerate) and de‑sorption (oxygen over‑saturation then aerate) procedures.
- DO time series are fitted with an exponential model to determine kLa and saturation values using non‑linear regression; an alternative log‑deficit (linear) method is given in Annex A.
- Measurements & instrumentation
- At least three DO probes (more for large or tapered tanks) and continuous recording (data logger preferred).
- DO probes calibrated per EN 25814; probe response time must be fast relative to tank response (probe kLa typically > 20 × tank kLa).
- Temperature, barometric pressure and test oxygen saturation value must be recorded and converted to standard conditions (T = 20 °C, p = 1013 hPa).
- Chemicals & gases
- Sodium sulphite and cobalt catalyst for absorption tests; nitrogen or pure oxygen gas can be used for de‑saturation/desorption tests.
- Reporting
- Results expressed as SOTR (kg/h), SAE (kg/kWh), SSOTE (%/m) and kLa (h‑1) with clearly stated aeration settings and conversions to standard conditions.
Practical applications and users
- Designed for wastewater treatment engineers, plant operators, aeration equipment manufacturers, testing laboratories, and consultants who need to:
- Evaluate and compare aerator performance (diffused air, surface aerators) under standardized conditions.
- Commission aeration systems, optimize energy use, or validate vendor claims for oxygen transfer and efficiency.
- Provide baseline data for process design and for converting clean‑water test results into in‑process performance using a‑factor corrections.
Related standards
- EN 12255-6 (Activated sludge process) - context for aeration tanks.
- EN 1085 (Wastewater vocabulary) - terminology.
- EN 25814 (Dissolved oxygen probe methods) and EN 25813 (Winkler titration reference) - measurement and calibration methods.
- Annex A of EN 12255-15 provides an alternative test and evaluation procedure (in‑situ calibration and log‑deficit method).
Keywords: EN 12255-15, oxygen transfer, clean water test, aeration tanks, activated sludge, SOTR, SAE, kLa, DO probes, aeration efficiency.
Frequently Asked Questions
EN 12255-15:2003 is a standard published by the European Committee for Standardization (CEN). Its full title is "Wastewater treatment plants - Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants". This standard covers: 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.
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.
EN 12255-15:2003 is classified under the following ICS (International Classification for Standards) categories: 13.060.30 - Sewage water. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 12255-15:2003 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN 12255-15:2003 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kläranlagen - Teil 15: Messung der Sauerstoffzufuhr in Reinwasser in Belüftungsbecken von BelebungsanlagenStations d'épuration - Partie 15: Mesurage du transfert d'oxygene en eau claire dans les bassins d'aération des stations d'épuration a boues activéesWastewater treatment plants - Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants13.060.30Odpadna vodaSewage waterICS:Ta slovenski standard je istoveten z:EN 12255-15:2003SIST EN 12255-15:2004en01-maj-2004SIST EN 12255-15:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12255-15December 2003ICS 13.060.30English versionWastewater treatment plants - Part 15: Measurement of theoxygen transfer in clean water in aeration tanks of activatedsludge plantsStations d'épuration - Partie 15: Mesure de performancesdes aérateursKläranlagen - Teil 15: Messung der Sauerstoffzufuhr inReinwasser in Belüftungsbecken von BelebungsanlagenThis European Standard was approved by CEN on 3 November 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12255-15:2003 ESIST EN 12255-15:2004
Alternative test and evaluation procedure.15A.1Principle.15A.2Measurement of the oxygen saturation value.15A.3In-situ calibration of the DO probes.15A.4Determination of the oxygen transfer coefficient.15Bibliography.16SIST EN 12255-15:2004
1 The volume expressed in m3 is applicable to standard conditions (dry air, zero humidity, p=1013 hPa, T=0°C), see also3.9.SIST EN 12255-15:2004
2(/ 1[DSt,20S,md,20S,´+´=hCC(6)3.8diffuser submergence (hD, m)depth below the water level of air release from the diffuser without aeration operating3.9normal air flow rate (QA, m³/h)air flow rate delivered to the aeration tank, corrected for standard conditions (dry air, zero humidity,p = 1 013 hPa, T = 0 °C)3.10aeration settingfor diffused air aeration: a specified air flow rate at a specified diffuser depth with or without additional mixing;for surface aerators: a specified freeboard or a specified immersion depth at a specified rotary speed and withor without baffles and/or additional mixing4 Symbols and abbreviationshDdiffuser submergence, in metre (m)C0oxygen concentration at t = 0, in milligramme per litre (mg/l)SIST EN 12255-15:2004
2 The volume expressed in cubic metre
is applicable to standard conditions (dry air, zero humidity, p=1013 hPa, T=0°C),see also 3.9.SIST EN 12255-15:2004
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...