EN 14701-1:2006

Characterisation of sludges - Filtration properties - Part 1: Capillary suction time (CST)

This document specifies a method for the determination of the capillary suction time. This document is applicable to sludge and sludge suspensions from:
¾   storm water handling;
¾   urban wastewater collecting systems;
¾   urban wastewater treatment plants;
¾   treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC);
¾   water supply treatment plants.
This method is also applicable to sludge suspensions from other origin.

Charakterisierung von Schlämmen - Filtrationseigenschaften - Teil 1: Bestimmung der kapillaren Fließzeit

Dieses Dokument legt ein Verfahren zur Bestimmung der kapillaren Fließzeit fest. Dieses Dokument gilt für Schlämme und Schlammsuspensionen aus folgenden Bereichen:
-   Behandlung von Regenwasser;
-   Kanalisationssysteme für kommunales Abwasser;
-   Anlagen für die Behandlung von kommunalem Abwasser;
-   Behandlung von industriellem Abwasser, die auf ähnliche Weise erfolgt wie die von kommunalem Abwasser (wie in der Richtlinie 91/271/EWG festgelegt);
-   Aufbereitungsanlagen für die Wasserversorgung.
Dieses Verfahren ist auch auf Schlammsuspensionen von anderer Herkunft anwendbar.

Caractérisation des boues - Propriétés de filtration - Partie 1: Détermination du temps de succion capillaire

Le présent document spécifie une méthode de détermination du temps de succion capillaire. Il s’applique aux boues et aux suspensions de boues provenant :
-   de la collecte des eaux pluviales ;
-   des systèmes de collecte des eaux usées urbaines ;
-   des stations d’épuration des eaux usées urbaines ;
-   de l’épuration des eaux industrielles semblables aux eaux usées urbaines (comme défini dans la Directive 91/271/CEE) ;
-   des usines de production d’eau potable.
Cette méthode s’applique également aux suspensions de boues ayant une autre origine.

Karakterizacija blata - Lastnosti filtracije – 1. del: Čas kapilarnega vsesavanja

General Information

• Status: Published
• Publication Date: 28-Mar-2006
• Withdrawal Date: 29-Sep-2006
• ICS: 13.030.20 - Liquid wastes. Sludge
• Technical Committee: CEN/TC 308 - Characterization of sludges
• Drafting Committee: CEN/TC 308/WG 1 - Characterization methods
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 09-Jun-2021
• Completion Date: 14-Apr-2025
• Directive: 86/278/EEC - Protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture
• Ref Project: SIST EN 14701-1:2006 - Characterisation of sludges - Filtration properties - Part 1: Capillary suction time (CST)

Overview

EN 14701-1:2006 is a CEN European Standard that specifies a laboratory method for measuring the capillary suction time (CST) of sludge and sludge suspensions. CST is a rapid, simple test used to assess sludge filtration properties and provide a qualitative indication of sludge dewaterability. The standard applies to sludges from stormwater systems, urban wastewater collection and treatment, industrial wastewater similar to urban wastewater (Directive 91/271/EEC), and water supply treatment plants - and is also applicable to other sludge origins.

Key topics and technical requirements

• Principle: CST measures the time for a liquid front to travel between two fixed points on an absorbent filter paper; faster wetting indicates better filterability.
• Scope of application: sewage sludges (activated, digested, thickened), waterworks sludges and other suspensions.
• Apparatus: standard CST device with reservoir and probes, automatic timing unit; recommended filter paper (e.g., chromatography paper such as Whatman No. 17 or equivalent). Annex A describes common instrument configurations (e.g., Triton Type 304).
• Procedure (high level):
  • Place filter paper with consistent orientation.
  • Mix sample by decanting between beakers four times.
  • Immediately fill reservoir and start measurement.
  • Repeat to obtain at least three valid readings.
• Expression of results: arithmetic mean of valid readings; discard measurements differing by >20% from the mean; temperature influence may be compensated using the ratio of dynamic viscosities (Annex D provides viscosity vs. temperature).
• Limitations: CST provides qualitative/comparative data and is influenced by filter paper type, surface tension, temperature and solids concentration. It does not directly indicate achievable solids content after dewatering.
• Precision and validation: Annex E summarizes round-robin validation results and gives repeatability and reproducibility statistics for different sludge types.

Applications and users

EN 14701-1:2006 is used for:

• Routine laboratory screening of sludge dewaterability in wastewater treatment plants.
• Process monitoring and troubleshooting for dewatering operations (belt presses, centrifuges).
• Research and development or comparative product testing for conditioning chemicals and polymers.
• Environmental laboratories, utilities, consultants, regulators and equipment manufacturers seeking a standardized, fast indicator of filterability.

Related standards

• EN 14701-2: Determination of the specific resistance to filtration
• EN 14701-3: Determination of compressibility
• EN 12832:1999 - vocabulary for sludge characterisation

Keywords: EN 14701-1:2006, capillary suction time, CST, sludge characterisation, filtration properties, dewaterability, wastewater sludge testing.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Characterisation of sludges - Filtration properties - Part 1: Capillary suction time (CST)Caractérisation des boues - Propriétés de filtration - Partie 1: Détermination du temps de succion capillaireCharakterisierung von Schlämmen - Filtrationseigenschaften - Teil 1: Bestimmung der kapillaren FließzeitTa slovenski standard je istoveten z:EN 14701-1:2006SIST EN 14701-1:2006en,fr,de13.030.20ICS:SLOVENSKI
STANDARDSIST EN 14701-1:200601-julij-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14701-1March 2006ICS 13.030.20 English VersionCharacterisation of sludges - Filtration properties - Part 1:Capillary suction time (CST)Caractérisation des boues - Propriétés de filtration - Partie1: Détermination du temps de succion capillaireCharakterisierung von Schlämmen -Filtrationseigenschaften - Teil 1: Bestimmung der kapillarenFließzeitThis European Standard was approved by CEN on 3 February 2006.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14701-1:2006: E

Simple automatic instrument for determining the filterability of sewage sludge.8 Annex B (informative)
Relation between CST and the specific resistance to filtration.9 Annex C (informative)
Relation between CST and solids content.10 Annex D (informative)
Table of dynamic viscosity.11 Annex E (informative)
Results of validation trials.12 Bibliography.15

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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