SIST EN 12255-5:2024
(Main)Wastewater treatment plants - Part 5: Lagooning processes
Wastewater treatment plants - Part 5: Lagooning processes
This European Standard specifies the performance requirements for the installation of lagooning processes. This part applies to wastewater lagooning processes treating municipal wastewater from combined or separate sewerage systems and when used as a tertiary treatment.
Note: Lagooning processes are especially suitable for treatment of wastewater where large variations in flow are experienced (e.g. resulting from stormwater). Lagoon Systems are also especially suitable when there are large variation in load from seasonal industrial or tourism for example.
Kläranlagen - Teil 5: Abwasserbehandlung in Teichen
Dieses Dokument legt die Leistungsanforderungen für die Installation von Teichanlagen fest.
Dieses Dokument gilt für Abwasserteiche für die Behandlung von kommunalem Abwasser aus Misch- oder Trennsystemen sowie für Teichanlagen, die als dritter Reinigungsteil verwendet werden.
ANMERKUNG Abwasserteichanlagen sind besonders dort zur Abwasserreinigung zweckmäßig, wo starke Volumen
stromschwankungen zu erwarten sind (z.B. aus Niederschlagswasser). Auch dort, wo starke Schwankungen der Stofffracht auftreten, zum Beispiel aus saisonaler Industrie oder Tourismus, sind Abwasserteichsysteme besonders zweckmäßig.
Stations d'épuration - Partie 5: Lagunage
Le présent document spécifie les exigences de performances de l’installation de lagunage.
Il s’applique aux procédés de lagunage des eaux usées municipales à partir de réseaux d’assainissement de type unitaire ou séparatif et lorsque le procédé est utilisé en tant que traitement tertiaire.
NOTE Le lagunage est particulièrement adapté au traitement des eaux usées en cas d’importantes variations du débit (par exemple, en raison des eaux pluviales). Les systèmes de lagunage sont particulièrement adaptés lorsqu’il y a d’importantes variations de la charge en raison de fluctuations industrielles saisonnières ou du tourisme, par exemple.
Čistilne naprave za odpadno vodo - 5. del: Lagunski postopki
Ta evropski standard določa zahteve glede učinkovitosti za vzpostavitev lagunskih postopkov. Ta del se uporablja za postopke zbiranja odpadne vode v lagunah (laguniranje) za čiščenje komunalne odpadne vode iz združenih ali ločenih kanalizacijskih sistemov in kadar se uporabljajo kot terciarno čiščenje.
Opomba: Lagunski postopki so zlasti primerni za čiščenje odpadne vode v primerih, kadar so prisotne velike razlike v stopnji pretoka (npr. zaradi meteorne vode) oziroma velike razlike v obremenitvi zaradi sezonske industrije ali turizma.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2024
Čistilne naprave za odpadno vodo - 5. del: Lagunski postopki
Wastewater treatment plants - Part 5: Lagooning processes
Kläranlagen - Teil 5: Abwasserbehandlung in Teichen
Stations d'épuration - Partie 5: Lagunage
Ta slovenski standard je istoveten z: EN 12255-5:2024
ICS:
13.060.30 Odpadna voda Sewage water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12255-5
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 13.060.30 Supersedes EN 12255-5:1999
English Version
Wastewater treatment plants - Part 5: Lagooning
processes
Stations d'épuration - Partie 5 : Lagunage Kläranlagen - Teil 5: Abwasserbehandlung in Teichen
This European Standard was approved by CEN on 22 January 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 12255-5:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 7
5 Process description . 7
5.1 General. 7
5.2 Anaerobic lagoons . 7
5.3 Facultative lagoons. 7
5.4 Mechanically aerated lagoons . 8
5.5 Clarification lagoons . 8
5.6 Maturation lagoons . 8
5.7 Combinations with other systems . 8
6 Requirements . 8
6.1 General. 8
6.2 Preliminary treatment . 8
6.3 Siting . 8
6.4 Accessibility . 9
6.5 Design . 9
6.5.1 Process considerations . 9
6.5.2 Watertightness . 9
6.5.3 Banks . 10
6.5.4 Pre-treatment . 10
6.5.5 Integration . 10
6.5.6 Hydraulic design of lagoons . 10
Annex A (informative) Typical design parameters for lagoons . 12
Bibliography . 14
European foreword
This document (EN 12255-5:2024) 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 September 2024, and conflicting national standards shall
be withdrawn at the latest by September 2024.
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 12255-5:1999.
The main changes in comparison with the previous edition EN 12255-5:1999 are:
a) comprehensive revision and additions in all sections;
b) adaptation to the current state of the art;
c) updating of the Normative references;
d) editorial revision.
It is the fifth 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. EN 12255 with the generic title Wastewater treatment plants consists of the following parts:
— Part 1: General construction principles
— Part 2: Storm water management systems
— Part 3: Preliminary treatment
— Part 4: Primary settlement
— 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 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
NOTE 1 Part 2 is under preparation.
NOTE 2 For requirements on pumping installations at wastewater treatment plants see EN 752, Drain and sewer
systems outside buildings — Sewer system management and EN 16932, Drain and sewer systems outside buildings —
Pumping systems.
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
Detailed information additional to that contained in this document may be obtained by referring to the
bibliography.
The primary application is for wastewater treatment plants designed for the treatment of domestic and
municipal wastewater.
1 Scope
This document is applicable to lagoons and specifies the performance requirements for the installation
of lagooning processes.
This document applies to wastewater lagooning processes treating municipal wastewater from combined
or separate sewage systems and when used as a tertiary treatment.
NOTE Lagoon systems are especially suitable for the treatment of wastewater where large flow variations
occur (e.g. arising from surface water connections in the collection system). They are also especially suitable where
large load variations occur (e.g. arising from fluctuating seasonal or industrial flows).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12255-1, Wastewater treatment plants — Part 1: General construction principles
EN 12255-10, Wastewater treatment plants — Part 10: Safety principles
EN 12255-11, Wastewater treatment plants — Part 11: General data required
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
maturation lagoon
wastewater lagoon used as a tertiary treatment typically for the removal of pathogenic micro-organisms
by exposure to solar radiation by competition and predation mechanisms
[SOURCE: EN 16323:2014, term number 2.3.5.27]
3.2
facultative lagoon
wastewater lagoon combining a natural aerated surface layer with a base anaerobic layer
Note 1 to entry: Facultative lagoons are typically used for the removal of carbon and nitrogen.
3.3
tertiary treatment
advanced treatment (deprecated)
additional treatment processes which result in further purification than that obtained by applying
primary and secondary treatment
[SOURCE: EN 16323:2014, term number 2.3.5.51]
4 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
COD chemical oxygen demand
TSS total suspended solids
UV ultraviolet light
5 Process description
5.1 General
Table 1 shows the lagoon types and the processes for which lagoons are used.
Table 1 — Lagoon types and processes
Aerobic
Anaerobic
Lagoon type Sedimentation Disinfection
degradation
degradation
a
+ + - -
Anaerobic lagoon
Facultative lagoon + + + -
Mechanically
- (+) + -
aerated lagoon
Clarification lagoon + + (+) -
Maturation lagoon + + +
+
the process is intended
(+) the process can occur
- the process does not occur
a
Anaerobic lagoons are not recommended.
5.2 Anaerobic lagoons
Anaerobic lagoons are used for separation and anaerobic digestion of solids. They generate methane and
release this greenhouse gas into the atmosphere. For this reason anaerobic lagoons should not be used,
and where they exist, they should be upgraded to aerated lagoons.
Anaerobic lagoons require periodic sludge removal.
5.3 Facu
...
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