EN 12255-8:2024

Wastewater treatment plants - Part 8: Sludge treatment and storage

This document specifies design principles and performance requirements for sludge treatment and storage facilities at wastewater treatment plants serving more than 50 PT.
Guidance on operation is provided where it is necessary in order to facilitate the design of control and automation and design access to points of operation.
NOTE   Other sludges and organic wastes can be treated together with municipal sewage sludge where national and local regulations permit.

Kläranlagen - Teil 8: Schlammbehandlung und -lagerung

Dieses Dokument legt Planungsgrundsätze und Leistungsanforderungen für Einrichtungen zur Behandlung und Lagerung von Schlamm in Kläranlagen für mehr als 50EW fest.
Wo nötig werden Leitlinien für den Betrieb gegeben, um die Auslegung von Steuerung und Automatisierung zu erleichtern und den Zugang zu Betriebspositionen zu planen.
ANMERKUNG Andere Schlämme oder organische Abfälle dürfen gemeinsam mit kommunalem Klärschlamm behandelt werden.

Stations d'épuration - Partie 8 : Stockage et traitement des boues

Le présent document spécifie les principes de conception et les exigences de performance en ce qui concerne les installations de traitement et de stockage des boues, pour les stations d’épuration d’eaux usées desservant plus de 50 équivalents-habitants (EH).
Des recommandations relatives au fonctionnement sont fournies à tous les emplacements nécessaires en vue de faciliter la conception de la régulation et de l’automatisation et de concevoir des accès aux différents points opérationnels.
NOTE   D’autres boues et déchets organiques peuvent être traités avec les boues d’épuration municipales lorsque les réglementations nationales et locales le permettent.

Čistilne naprave za odpadno vodo - 8. del: Obdelava in skladiščenje blata

General Information

• Status: Published
• Publication Date: 07-May-2024
• ICS: 13.060.30 - Sewage water
• Technical Committee: CEN/TC 165 - Waste water engineering
• Drafting Committee: CEN/TC 165/WG 40 - Wastewater treatment plants > 50 PT
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-May-2024
• Due Date: 07-Jul-2023
• Completion Date: 08-May-2024
• Directive: 93/38/EEC - Procurement procedures of entities operating in the water, energy, transport and telecommunications sectors
• Mandate: M/BC/CEN/88/15 - Standardization request to CEN/CENELEC in the field of Water supply, drainage and sewerage
• Ref Project: SIST EN 12255-8:2024 - Wastewater treatment plants - Part 8: Sludge treatment and storage

Relations

• Replaces: EN 12255-8:2001 - Wastewater treatment plants - Part 8: Sludge treatment and storage
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2024
Čistilne naprave za odpadno vodo - 8. del: Obdelava in skladiščenje blata
Wastewater treatment plants - Part 8: Sludge treatment and storage
Kläranlagen - Teil 8: Schlammbehandlung und -lagerung
Stations d'épuration - Partie 8: Stockage et traitement des boues
Ta slovenski standard je istoveten z: EN 12255-8:2024
ICS:
13.060.30 Odpadna voda Sewage water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12255-8
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 13.060.30 Supersedes EN 12255-8:2001
English Version
Wastewater treatment plants - Part 8: Sludge treatment
and storage
Stations d'épuration - Partie 8 : Stockage et traitement Kläranlagen - Teil 8: Schlammbehandlung und -
des boues lagerung
This European Standard was approved by CEN on 27 February 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 12255-8:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols and abbreviations . 8
5 Planning . 9
6 Processes . 10
6.1 General. 10
6.2 Sludge conditioning . 10
6.2.1 Overview . 10
6.2.2 Use of Polymers [14] . 10
6.2.3 Polymer storage and distribution . 12
6.3 Sludge thickening . 12
6.3.1 Process selection . 12
6.3.2 Gravity thickening . 13
6.3.3 Mechanical thickening . 14
6.3.4 Dissolved air flotation . 14
6.3.5 Overview of thickening systems . 15
6.4 Disinfection . 16
6.4.1 General. 16
6.4.2 Thermal disinfection . 17
6.4.3 Chemical disinfection . 18
6.4.4 Other methods . 18
6.4.5 Verification of disinfection success . 18
6.5 Sludge pre-treatment prior to biological sludge stabilization . 19
6.6 Biological Sludge Stabilization . 19
6.6.1 General and stabilization requirements . 19
6.6.2 Anaerobic sludge digestion . 19
6.6.3 Aerobic sludge digestion . 25
6.6.4 Sludge composting . 25
6.6.5 Pseudo-stabilization . 26
6.7 Sludge dewatering . 26
6.7.1 Sludge drying beds . 26
6.7.2 Mechanical sludge dewatering . 26
6.8 Sludge drying [18] . 29
6.8.1 General. 29
6.8.2 Belt dryers . 30
6.8.3 Solar and additionally heated solar dryers . 31
6.9 Sludge handling and storage . 33
6.9.1 General. 33
6.9.2 Liquid sludge holding tanks . 33
6.9.3 Sludge lagoons . 33
6.9.4 Dewatered sludge storage areas . 33
6.9.5 Dewatered or dry sludge silos . 34
7 Components . 34
7.1 Service life . 34
7.2 Sludge pipelines . 34
7.3 Sludge pumps . 34
8 Health and safety . 35
Annex A (informative) Other guidance and information . 36
A.1 Process checks . 36
A.2 Sludge pre-treatment prior to biological sludge stabilization . 36
A.2.1 Sludge disintegration . 36
A.2.2 Biological hydrolysis . 39
A.2.3 Recommendations . 39
A.3 Basic sludge characteristics . 40
A.3.1 General . 40
A.3.2 Further sludge characteristics . 41
A.4 Methods to optimize the polymer consumption . 42
A.5 Methods to predict dewatering performance . 42
Bibliography . 44

European foreword
This document (EN 12255-8:2024) has been prepared by Technical Committee CEN/TC 165
“Wastewater 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 November 2024, and conflicting national standards shall
be withdrawn at the latest by November 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 12255-8:2001.
The main changes compared to the previous edition EN 12255-8:2001 are listed below:
a) comprehensive revision and additions in all sections;
b) addition of design recommendations;
c) addition of sludge drying systems;
d) adaptation to the current state of the art;
d) updating of the Normative references;
e) editorial revision.
It is the eighth 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 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 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 F
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