EN 12255-16:2021

SLOVENSKI STANDARD
01-oktober-2021
Nadomešča:
SIST EN 12255-16:2005
Čistilne naprave za odpadno vodo - 16. del: Fizična (mehanska) filtracija
Wastewater treatment plants - Part 16: Physical (mechanical) filtration
Kläranlagen - Teil 16: Abwasserfiltration
Stations d’épuration - Partie 16 : Filtration physique (mécanique)
Ta slovenski standard je istoveten z: EN 12255-16:2021
ICS:
13.060.30 Odpadna voda Sewage water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12255-16
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 13.060.30 Supersedes EN 12255-16:2005
English Version
Wastewater treatment plants - Part 16: Physical
(mechanical) filtration
Stations d'épuration - Partie 16 : Filtration physique Kläranlagen - Teil 16: Abwasserfiltration
(mécanique)
This European Standard was approved by CEN on 21 June 2021.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12255-16:2021 E
worldwide for CEN national Members.

Contents                                                          Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and abbreviations . 7
5 Requirements . 8
5.1 General. 8
5.2 Process types . 8
5.2.1 Deep bed filtration . 8
5.2.2 Surface filtration . 9
5.2.3 Pilecloth filtration . 9
6 Planning . 9
7 Process design . 10
7.1 Design factors . 10
7.2 Selection of filter media . 10
7.2.1 General. 10
7.2.2 Deep bed filters. 11
7.2.3 Surface filters . 11
7.3 Cleaning systems . 11
7.3.1 General. 11
7.3.2 Deep bed filters. 12
7.3.3 Surface filters . 12
7.4 Dimensions. 12
7.4.1 General. 12
7.4.2 Deep bed filters. 13
7.4.3 Surface Filters . 13
7.5 Flow distribution . 13
7.5.1 General. 13
7.5.2 Deep bed filters. 13
7.5.3 Surface filters . 13
7.6 Construction principles . 14
7.6.1 General. 14
7.6.2 Deep bed filters. 14
7.6.3 Surface filters . 14
7.6.4 Materials . 15
7.7 Mechanical and electrical equipment . 15
7.7.1 General. 15
7.7.2 Deep bed filters. 15
7.7.3 Surface filters . 16
7.7.4 System controls . 16
7.7.5 Performance monitoring . 16
7.8 Additional considerations . 17
7.8.1 Maintenance . 17
7.8.2 Protection of the equipment . 17
7.9 Hazard protection . 17
Annex A (informative) Filter dimensioning table . 18
Bibliography . 22
EN 12255-16:202 1 (E)
European foreword
This document (EN 12255-16:2021) 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 January 2022, and conflicting national standards shall
be withdrawn at the latest by January 2022.
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 is the sixteenth 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 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 For requirements on pumping installations at wastewater treatment plants see EN 752 “Drain and sewer
systems outside buildings - Sewer system management” and EN 16932 (all parts) “Drain and sewer systems outside
buildings – Pumping systems”.
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.
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, Turkey and the United
Kingdom.
EN 12255-16:202 1 (E)
1 Scope
This document specifies design principles and performance requirements for tertiary clarification
(receiving effluent from secondary treatment) by physical filtration plant at wastewater treatment plants
serving more than 50 PT.
NOTE 1 Ultrafiltration, nanofiltration and reverse osmosis are not covered within the scope of this document as
they are not considered to be used for tertiary clarification.
NOTE 2 Soil filtration is not covered in this document.
NOTE 3 Activated carbon filtration is excluded from the scope of this document as it is not considered to be a
form of mechanical filtration.
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 appli
...