SIST 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:
- storm water handling;
- urban wastewater collecting systems;
- urban wastewater treatment plants;
- treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC);
- 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 systemes 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: 30-Jun-2006
• ICS: 13.030.20 - Liquid wastes. Sludge
• Technical Committee: KAT - Soil quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-2006
• Due Date: 01-Jul-2006
• Completion Date: 01-Jul-2006
• Directive: 86/278/EEC - Protection of the environment, and in particular of the soil, when sewage sludge is used in agriculture
• Ref Project: EN 14701-1:2006 - Characterisation of sludges - Filtration properties - Part 1: Capillary suction time (CST)

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



EN 14701-1:2006 (E) 2 Contents Page Foreword.3 1 Scope.5 2 Normative references.5 3 Terms and definitions.5 4 Principle.5 5 Apparatus.6 5.1 Standard apparatus.6 5.2 Filter paper.6 5.3 Beakers.6 6 Procedure.6 7 Expression of results.6 8 Precision.7 9 Test report.7 Annex A (informative)
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



EN 14701-1:2006 (E) 3 Foreword This document (EN 14701-1:2006) has been prepared by Technical Committee CEN/TC 308 “Characterisation of sludges”, the secretariat of which is held by AFNOR. 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 2006, and conflicting national standards shall be withdrawn at the latest by September 2006. Other parts of this European Standard are:  Part 2: Determination of the specific resistance to filtration;  Part 3: Determination of the compressibility.
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.



EN 14701-1:2006 (E) 4 Introduction The capillary suction time (CST) is a fast and simple way to evaluate the sludge dewaterability by filtration. This method gives no information on the obtainable solids content in a dewatering process. The measurement of CST should also make possible the evaluation, although only qualitatively, of other sludge characteristics, including dewaterability by centrifugation.



EN 14701-1:2006 (E) 5 1 Scope This document specifies a method for the determination of the capillary suction time. This document is applicable to sludge and sludge suspensions from:  storm water handling;  urban wastewater collecting systems;  urban wastewater treatment plants;  treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC);  water supply treatment plants. This method is also applicable to sludge suspensions from other origin. 2 Normative references The following referenced documents are indispensable for the application 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 12832:1999, Characterization of sludges — Utilization and disposal of sludges — Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12832:1999 and the following apply. 3.1 filterability property indicating the amenability of a sludge to be dewatered by a filtration process 3.2 capillary suction time (CST) measurement of the time for a wetting front in a filter paper to travel between two fixed points 4 Principle The principle of the method is that dewatering is achieved by the suction applied to the sludge by the capillary action of an absorbent filter paper. A part of the absorbent paper area is exposed to the sludge, while the remaining area is free for absorbing the filtrate. The rate at which the paper becomes wetted with filtrate is a measure correlated to sludge dewaterability: it is measured by the time necessary for the filtrate to cover the space between two probes which detect the advancement of the liquid front on the paper (Annex A informative). The CST measurements are strongly affected by many factors, such as properties of the paper, surface tension, temperature, suspended solids concentration, so they give only qualitative and comparative evaluations which can be correlated to the specific resistance to filtration (prEN 14701-2) for a given type of sludge (Annex B informative).



EN 14701-1:2006 (E) 6 5 Apparatus 5.1 Standard apparatus Device consisting of: a) filtration apparatus, including base for supporting the absorbent paper, sludge reservoir and probes; b) automatic time recording unit, including amplifier and digital electric stop-clock recording in seconds (see Annex A informative). 5.2 Filter paper Paper suitable for chromatography with grain parallel with the longer side (for instance, Whatman n. 17 or Wickam CST Papers 7 cm x 9 cm code 8680841) ). NOTE For comparable results the same filter paper type should be used. 5.3 Beakers Conventional beakers, 50 ml minimum. 6 Procedure 6.1 Place a filter paper in the apparatus. The filter paper shall always be placed with the same side up. 6.2 Mix the sludge to be tested by pouring it off from a beaker to another for 4 times. 6.3 Pour immediately the mixed sludge into the reservoir until it is completely full. Great attention shall be paid in performing measurements immediately after the sludge mixing to avoid any result unreliability due to sludge settling into the beaker (especially for conditioned sludges). 6.4 When the clock stops, register the time which has been automatically measured. 6.5 Repeat steps 6.1 to 6.4 in order to have at least 3 significant values, as stated in Clause 7. 7 Expression of results The CST value is gi
...