SIST EN 12255-7:2002
(Main)Wastewater treatment plants - Part 7: Biological fixed-film reactors
Wastewater treatment plants - Part 7: Biological fixed-film reactors
This European Standard specifies the design principles and performance requirements for secondary treatment by biological fixed-film reactors at wastewater treatment plants for more than 50 PT.
The primary application is for wastewater treatment plants designed for the treatment of domestic and municipal wastewater.
Biological fixed film reactors include biological trickling filters, rotating biological contactors, submerged bed reactors and biofilters.
Differences in wastewater treatment throughout Europe have led to a variety of systems being developed. This standard gives fundamental informations about the systems; this standard has not attempted to specify all available systems.
Detailed information additional to that contained in this standard may be obtained by referring to the Bibliography.
Kläranlagen - Teil 7: Biofilmreaktoren
Diese Europäische Norm legt Grundsätze der Planung und Anforderungen an Biofilmre-aktoren als zweiten (biologischen) Reinigungsteil von Kläranlagen über 50 EW fest.
Die Anwendung bezieht sich in erster Linie auf Kläranlagen, die zum Reinigen von häuslichem und kommunalem Abwasser geplant werden.
Biofilmreaktoren umfassen Tropfkörper, Rotationstauchkörper, Biofilmreaktoren mit getauchtem Trägermaterial und biologische Filter.
Die Unterschiede in Planung und Bau von Kläranlagen in Europa haben zu einer Vielzahl von Anlagenausführungen geführt. Diese Europäische Norm enthält grundsätzliche Angaben zu den Anlagenausführungen; sie beschreibt jedoch nicht alle Einzelheiten jeder Ausführungsart.
Die in den Literaturhinweisen aufgeführten Unterlagen enthalten Einzelheiten und Hinweise, die im Rahmen dieser Norm verwendet werden dürfen.
Stations d'épuration - Partie 7: Réacteurs biologiques a cultures fixées
La présente Norme européenne spécifie les principes d'étude et les prescriptions de performances applicables au traitement secondaire des eaux usées par réacteurs biologiques à cultures fixées dans des stations d'épuration pour plus de 50 EH.
La principale application concerne les stations d'épuration conçues pour traiter des eaux usées domestiques et municipales.
Le terme réacteurs biologiques à cultures fixées recouvre les lits bactériens, les disques et tambours biologiques, les réacteurs à lit immergé et les biofiltres.
Des différences en matière de traitement des eaux usées résiduaires à travers l'Europe ont conduit au développement de systèmes variés. La présente norme donne les informations de base sur les systèmes et n' a pas eu pour objectif d'essayer de spécifier tous les systèmes disponibles.
Des informations détaillées, complémentaires à celles contenues par la présente norme, peuvent être obtenues en se reportant à la bibliographie.
Čistilne naprave za odpadno vodo – 7. del: Biološki reaktorji s pritrjeno biomaso
General Information
- Status
- Published
- Publication Date
- 30-Nov-2002
- Technical Committee
- IOVO - Water supply and waste water engineering
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2002
- Due Date
- 01-Dec-2002
- Completion Date
- 01-Dec-2002
Relations
- Revised
kSIST FprEN 12255-7:2024 - Wastewater treatment plants - Part 7: Biological fixed-film reactors - Effective Date
- 28-Jan-2023
- Effective Date
- 22-Dec-2008
Overview
EN 12255-7:2002 is the CEN European Standard that specifies design principles and performance requirements for secondary treatment using biological fixed‑film reactors at wastewater treatment plants sized for more than 50 PT (population equivalents). Its primary scope covers treatment of domestic and municipal wastewater and includes the main fixed‑film technologies: trickling filters, rotating biological contactors (RBCs), submerged bed reactors and biofilters. The standard provides fundamental guidance rather than an exhaustive catalogue of all system variants.
Key topics and technical requirements
- Types of fixed‑film processes: descriptions and operating principles for trickling filters, RBCs, submerged bed reactors and biofilters.
- Design parameters: recommended operational metrics such as volumetric loading (kg/m3·d), mass surface loading (kg/m2·d), surface loading rate (m3/m2·h), recirculation ratios and flushing intensity.
- Support media selection: guidance on media materials, voidage and specific surface area limits (examples given for high‑rate and nitrifying stages and for suspended media).
- Aeration and oxygen supply: requirements for even air distribution in submerged beds and blower systems.
- Flow distribution and hydraulics: avoidance of dead zones, uniform distribution through beds, head loss minimisation and flow‑distribution equipment (e.g., rotary distributors).
- Solids handling and clarification: need for humus tanks or final clarification depending on process; backwashing considerations for different media types.
- Modes of operation: single‑stage, two‑stage and alternating double filtration arrangements; options for carbonaceous oxidation, nitrification and denitrification (including recirculation and external carbon dosing where required).
- Planning and reliability: multiple lines/units for operational resilience, sludge treatment/disposal, measurement and control, and structural and equipment design.
Practical applications and users
EN 12255-7:2002 is used by:
- Municipal and regional wastewater engineers designing secondary treatment for small to medium plants (>50 PT).
- Consulting engineers and designers selecting fixed‑film technologies (trickling filters, RBCs, submerged beds, biofilters).
- Plant operators and asset managers implementing operational controls, aeration, backwash and clarification strategies.
- Equipment manufacturers and suppliers of media, distributors, blowers and mechanical components.
- Regulators and procurement teams specifying performance and compliance requirements.
Related standards
- EN 12255 series (Parts 1, 6, 10, 11) - general plant requirements, activated sludge, safety, data.
- EN 1085 - wastewater treatment vocabulary.
- EN 752‑6 - pumping installations (relevant for recirculation and dosing).
- Bibliography in EN 12255‑7 provides additional detailed references.
EN 12255‑7:2002 is a practical reference for engineers and operators seeking standardized guidance on designing and operating biological fixed‑film reactors in municipal wastewater treatment.
Frequently Asked Questions
SIST EN 12255-7:2002 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Wastewater treatment plants - Part 7: Biological fixed-film reactors". This standard covers: This European Standard specifies the design principles and performance requirements for secondary treatment by biological fixed-film reactors at wastewater treatment plants for more than 50 PT. The primary application is for wastewater treatment plants designed for the treatment of domestic and municipal wastewater. Biological fixed film reactors include biological trickling filters, rotating biological contactors, submerged bed reactors and biofilters. Differences in wastewater treatment throughout Europe have led to a variety of systems being developed. This standard gives fundamental informations about the systems; this standard has not attempted to specify all available systems. Detailed information additional to that contained in this standard may be obtained by referring to the Bibliography.
This European Standard specifies the design principles and performance requirements for secondary treatment by biological fixed-film reactors at wastewater treatment plants for more than 50 PT. The primary application is for wastewater treatment plants designed for the treatment of domestic and municipal wastewater. Biological fixed film reactors include biological trickling filters, rotating biological contactors, submerged bed reactors and biofilters. Differences in wastewater treatment throughout Europe have led to a variety of systems being developed. This standard gives fundamental informations about the systems; this standard has not attempted to specify all available systems. Detailed information additional to that contained in this standard may be obtained by referring to the Bibliography.
SIST EN 12255-7:2002 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.
SIST EN 12255-7:2002 has the following relationships with other standards: It is inter standard links to kSIST FprEN 12255-7:2024; is excused to SIST EN 12255-13:2003. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 12255-7:2002 is associated with the following European legislation: EU Directives/Regulations: 93/38/EEC; Standardization Mandates: M/BC/CEN/88/15. 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.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kläranlagen - Teil 7: BiofilmreaktorenStations d'épuration - Partie 7: Réacteurs biologiques a cultures fixéesWastewater treatment plants - Part 7: Biological fixed-film reactors13.060.30Odpadna vodaSewage waterICS:Ta slovenski standard je istoveten z:EN 12255-7:2002SIST EN 12255-7:2002en01-december-2002SIST EN 12255-7:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12255-7January 2002ICS 13.060.30English versionWastewater treatment plants - Part 7: Biological fixed-filmreactorsStations d'épuration - Partie 7: Réacteurs biologiques àcultures fixéesKläranlagen - Teil 7: BiofilmreaktorenThis European Standard was approved by CEN on 9 November 2001.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,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12255-7:2002 ESIST EN 12255-7:2002
1) In preparation.SIST EN 12255-7:2002
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