Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludge

This document specifies a method for the determination of drainability of flocculated sludge. It 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 4: Bestimmung der Entwässerbarkeit geflockter Schlämme

Dieses Dokument legt ein Verfahren zur Bestimmung der Entwässerbarkeit geflockter Schlämme fest. Das 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);
—   Wasseraufbereitungsanlagen.
Dieses Verfahren ist auch auf Schlammsuspensionen anderer Herkunft anwendbar.

Caractérisation des boues - Propriétés de filtration - Partie 4 : Détermination de l'aptitude à l'égouttage des boues floculées

Le présent document spécifie une méthode de détermination de l’aptitude à l’égouttage des boues floculées. Il s’applique aux boues et aux suspensions concentrées issues :
-   de la collecte des eaux pluviales ;
-   de systèmes de collecte des eaux usées urbaines ;
-   de stations d’épuration des eaux usées urbaines ;
-   de l’épuration des eaux usées industrielles semblables aux eaux usées urbaines (définie dans la Directive 91/271/CEE) ;
-   d’usines de production d’eau potable.
Cette méthode s’applique aussi aux suspensions concentrées d’origines différentes.

Karakterizacija blata - Lastnosti filtriranja - 4. del: Določevanje odcejalnih sposobnosti izkosmičenega blata

Ta evropski standard določa metodo za določevanje prepustnosti kosmičenega blata. Uporablja se za
blato in suspenzije blata iz:
a) ravnanja z vodo ob neurjih;
b) komunalnih odpadnih vod iz kanalizacijskih sistemov;
c) čistilnih naprav za komunalno odpadno vodo;
d) čiščenja industrijske odpadne vode na podoben način kot komunalne odpadne vode (kot je opredeljeno v Direktivi 91/271/EGS);
e) čistilnih naprav za sistem oskrbe z vodo. Ta metoda se uporablja tudi za suspenzije blata drugega izvora.

General Information

Publication Date
Withdrawal Date
Current Stage
9060 - Closure of 2 Year Review Enquiry - Review Enquiry
Start Date
Completion Date


Buy Standard

EN 14701-4:2019 - BARVE
English language
18 pages
sale 10% off
sale 10% off
e-Library read for
1 day

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Charakterisierung von Schlämmen - Filtrationseigenschaften - Teil 4: Bestimmung der Entwässerung von geflockten SchlämmenCaractérisation des boues - Propriétés de filtration - Partie 4 : Détermination de l'aptitude à l'égouttage des boues floculées13.030.20Liquid wastes. SludgeICS:Ta slovenski standard je istoveten z:EN 14701-4:2018SIST EN 14701-4:2019en,fr,de01-april-2019SIST EN 14701-4:2019SLOVENSKI

EN 14701-4
t r s z ICS
s uä r u rä t r Supersedes EN
s v y r sæ vã t r s rEnglish Version
Characterization of sludges æ Filtration properties æ Part
vã Determination of the drainability of flocculated sludge Caractérisation des boues æ Propriétés de filtration æ Partie
v ã Détermination de l 5aptitude à l 5égouttage des boues floculées
Charakterisierung von Schlämmen æ Filtrationseigenschaften æ Teil
vã Bestimmung der Entwässerbarkeit geflockter Schlämme This European Standard was approved by CEN on
w November
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s v y r sæ vã t r s z ESIST EN 14701-4:2019

Typical gravity drainage cell . 10 Annex B (informative)
Quantity of sludge in a gravity belt filtration . 11 Annex C (informative)
Results of validation trials . 12 Annex D (informative)
Use of drainability index . 16 Bibliography . 18
— Part 1: Capillary suction time (CST); — Part 2: Determination of the specific resistance to filtration; — Part 3: Determination of the compressibility; — Part 4: Determination of the drainability of flocculated sludges. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14701-4:2019

IEC Electropedia: available at
ISO Online browsing platform: available at 3.1 drainability ability of treated sludge to separate from sludge liquor by gravity filtration 3.2 flocculation coagulation by means of inorganic flocculants or organic ones (polyelectrolytes) SIST EN 14701-4:2019

Gently pour (without shaking) the flocculated sludge in the centre of the cell for the sludge to recover the whole surface of the filtering medium. e) Record the cumulative mass of filtrate collected over time every 0,5 s at least during the first 30 s. f) Stop the test when the mass of filtrate to initial mass of sludge ratio is constant to within 0,1 g or after 10 min. g) Measure the concentration of suspended solids in the filtrate, according to EN 872, and the wet and dry mass of the sludge retained on the filter medium, according to EN 15934. SIST EN 14701-4:2019

(4) SIST EN 14701-4:2019
Key 1 time for 90 % of (m/m0)f Figure 1 — Determination of t90 with a classical drainage curve The drainability index (Eg) is expressed by the following formula as discussed in [2]: βα==××f0112349030ln60ln()()grSiSiPEPPtSMSi (5) NOTE
have been chosen by compiling hundreds of data (correlation numbers) and do not result from a theoretical approach. Annex D gives information about the use of drainability index for drainage process optimization. SIST EN 14701-4:2019

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.