SIST EN 12255-1:2025
(Main)Wastewater treatment plants - Part 1: General construction principles
Wastewater treatment plants - Part 1: General construction principles
This European Standard specifies general requirements for structures and equipment as they relate to wastewater treatment plants for a total population of more than 50 PT.
The primary application is designed for wastewater treatment plants for the treatment of domestic and municipal wastewater.
Requirements for structures which are not specific for wastewater treatment plants are not within the scope of this European Standard. Other ENs can apply.
Equipment which is not solely used in wastewater treatment plants is subject to the applicable product standards. However, specific requirements for such equipment when used in wastewater treatment plants are included in this part.
General principles of building construction, mechanical and electrical engineering are not subject of this standard.
This European Standard does not cover the design of treatment processes.
Differences in wastewater treatment throughout Europe have led to a variety of systems being developed. This standard gives fundamental information 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 1: Allgemeine Baugrundsätze
Dieses Dokument legt die grundlegenden Planungs- und Bauausführungsanforderungen an Kläranlagen für mehr als 50 EW fest.
ANMERKUNG 1 Anforderungen an Bauwerke, die nicht spezifisch für Kläranlagen sind, sind nicht Gegenstand dieses Dokuments. Andere Europäische Normen können hierfür gelten.
ANMERKUNG 2 Für technische Ausrüstung, die nicht ausschließlich auf Kläranlagen eingesetzt wird, sind die einschlägigen Produktnormen zu beachten. Besondere Anforderungen an eine solche technische Ausrüstung hinsichtlich ihres Einsatzes auf Kläranlagen sind allerdings Gegenstand dieses Teils der Normenreihe.
Stations d’épuration - Partie 1 : Principes généraux de conception et de construction
Le présent document spécifie les exigences fondamentales relatives à la conception et à la construction des stations d’épuration de plus de 50 EH.
NOTE 1 Les exigences structurelles qui ne sont pas spécifiques aux stations d’épuration ne font pas partie du domaine d’application du présent document. D’autres Normes européennes peuvent s’appliquer.
NOTE 2 Les équipements qui ne sont pas utilisés uniquement dans les stations d’épuration sont soumis à l’application des normes de produit correspondantes. Néanmoins, les exigences particulières à ces équipements, lorsqu’ils sont utilisés dans les stations d’épuration, peuvent être incluses dans la présente norme.
Čistilne naprave za odpadno vodo - 1. del: Splošna načela gradnje
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2025
Čistilne naprave za odpadno vodo - 1. del: Splošna načela gradnje
Wastewater treatment plants - Part 1: General construction principles
Kläranlagen - Teil 1: Allgemeine Baugrundsätze
Stations d’épuration - Partie 1 : Principes généraux de conception et de construction
Ta slovenski standard je istoveten z: EN 12255-1:2024
ICS:
13.060.30 Odpadna voda Sewage water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12255-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 13.060.30 Supersedes EN 12255-1:2002
English Version
Wastewater treatment plants - Part 1: General design and
construction principles
Stations d'épuration - Partie 1 : Principes généraux de Kläranlagen - Teil 1: Allgemeine Baugrundsätze
conception et de construction
This European Standard was approved by CEN on 27 October 2024.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12255-1:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Abbreviated terms . 11
5 Requirements . 12
5.1 General requirements . 12
5.2 Design requirements . 13
5.2.1 Resilience . 13
5.2.2 Safety and accessibility . 14
5.2.3 Other design requirements . 15
5.3 Modularity . 16
5.4 Structural requirements . 16
5.4.1 General. 16
5.4.2 Dimensional tolerances . 17
5.4.3 Concrete tracks for travelling mechanical equipment (e.g. Scraper Bridges) . 17
5.4.4 Fixings and connections between equipment and structures . 17
5.4.5 Safe access . 17
5.4.6 Building ventilation . 18
5.4.7 Water supply and drainage . 18
5.4.8 Lifting equipment . 18
5.4.9 Storage and conveyance of hazardous chemicals and fuels . 18
5.5 Requirements for equipment . 19
5.5.1 Principles for mechanical design . 19
5.5.2 General design requirements . 20
5.5.3 Environmental impact . 23
5.5.4 Safety . 24
5.5.5 Documentation . 24
5.5.6 Spare parts, special tools . 24
6 Test methods . 25
6.1 Function and performance . 25
6.2 Tightness testing of concrete structures . 25
6.3 Tightness testing of other structures and equipment . 25
7 Cost Comparison Analysis . 25
Annex A (informative) Design Service Life . 26
Annex B (normative) Structural tolerances . 27
B.1 Circular tank . 27
B.1.1 Circular clarifiers with scrapers . 27
B.1.2 Circular tank with a scraper bridge travelling on the side wall (track) . 27
B.1.3 Rectangular clarifiers with scrapers . 27
Annex C (normative) Wall tracks . 28
C.1 Tracks . 28
C.2 Walls . 28
C.3 Wheels . 28
C.4 Freezing conditions . 28
Annex D (normative) Scraper Design . 29
D.1 Physical loads . 29
D.2 Driver control . 29
D.3 Bar and chain scrapers . 29
D.4 Monitoring. 30
D.5 Maintainability . 30
D.6 Design life . 30
Bibliography . 31
European foreword
This document (EN 12255-1:2024) has been prepared by Technical Committee CEN/TC 165 “Waste
water engineering”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2025, and conflicting national standards shall be
withdrawn at the latest by May 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12255-1:2002.
The main changes compared to the previous edition are listed below:
a) update of title and scope to incorporate design;
b) comprehensive revision and additions in all sections;
c) adaptation to the current state of the art;
d) updating of the Normative references;
e) editorial revision.
This is the first part prepared by Working Group CEN/TC 165/WG 40 relating to the general
requirements and processes for treatment plants for a total number of inhabitants and population
equivalents (PT) over 50.
The EN 12255 series with the generic title “Wastewater treatment plants” consists of the following parts:
— Part 1: General design and construction principles
— Part 2 : Storm management systems
— Part 3: Preliminary treatment
— Part 4: Primary treatment
— Part 5: Lagooning processes
— Part 6: Activated sludge process
— Part 7: Biological fixed-film reactors
— Part 8: Sludge treatment and storage
— Part 9: Odour control and ventilation
— Part 10: Safety principles
Part 2 is under preparation.
— Part 11: General data required
— Part 12: Control and automation
— Part 13: Chemical treatment — Treatment of wastewater by precipitation/flocculation
— Part 14: Disinfection
— Part 15: Measurement of the oxygen transfer in clean water in aeration tanks of activated sludge plants
— Part 16: Physical (mechanical) filtration
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
Differences in wastewater treatment throughout Europe have led to a variety of systems being developed.
This document gives fundamental information about the systems; this document has not attempted to
specify all available systems. A generic arrangement of wastewater treatment plants is illustrated in
Figure 1.
Key
1 preliminary treatment
2 primary treatment
3 secondary treatment
4 tertiary treatment
5 additional treatment (e.g. disinfection or removal of micropollutants)
6 sludge treatment
7 lagoons (as an alternative)
A raw wastewater
B effluent for re-use (e.g. irrigation)
C discharged effluent
D screenings and grit
E primary sludge
F secondary sludge
G tertiary sludge
H digested sludge
I digester gas
J returned water from dewatering
Figure 1 — Schematic diagram of wastewater treatment plants
The primary application is for wastewater treatment plants designed for the treatment of domestic and
municipal wastewater.
SIST EN 1225
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