SIST EN 14701-4:2019

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

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 Entwässerung von geflockten Schlämmen

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

• Status: Published
• Public Enquiry End Date: 04-Aug-2017
• Publication Date: 11-Mar-2019
• ICS: 13.030.20 - Liquid wastes. Sludge
• Technical Committee: KAT - Soil quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 07-Feb-2019
• Due Date: 14-Apr-2019
• Completion Date: 12-Mar-2019
• Ref Project: EN 14701-4:2018 - Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludge

Relations

• Replaces: SIST EN 14701-4:2010 - Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges
• Effective Date: 01-Apr-2019

Overview

EN 14701-4:2018 - Characterization of sludges: Filtration properties - Part 4 specifies a laboratory method to determine the drainability of flocculated sludge. The standard applies to sludges and sludge suspensions from stormwater, urban wastewater collection and treatment, industrial wastewater similar to urban wastewater (Directive 91/271/EEC), water-supply treatment plants and other origins. The test evaluates how readily treated (flocculated) sludge releases water by gravity filtration and supports flocculant selection, dosing and thickening optimization.

Key topics and technical requirements

• Scope and definitions: Drainability is defined as the ability of treated sludge to separate from sludge liquor by gravity filtration; flocculation refers to coagulation with inorganic/organic polyelectrolytes.
• Sample conditioning: Flocculation must be performed under repeatable, quantified conditions per EN 14742 or tested on pre-flocculated samples.
• Apparatus: Typical gravity drainage cell (transparent tube ~150 mm diameter), a filtering medium matching full-scale equipment, a filtrate draining device, a beaker, and a balance (≥0.1 g accuracy) connected to software to record cumulative filtrate mass (data at least every 0.5 s).
• Procedure: Measure initial water content; pour ~1 L flocculated sludge into the cell; record cumulative filtrate mass vs time (intensively during first 30 s); stop when filtrate mass stabilizes or after 10 min; determine cake dryness and suspended solids in filtrate (EN 15934, EN 872).
• Results and metrics:
  • Dimensionless filtrate mass ratio at t = 30 s, 90 s and test end.
  • Reference time to collect filtrate equal to 50% of sludge water content.
  • Cake dryness and suspended solids in filtrate.
  • Drainability index (Eg) - an adimensional indicator combining sludge dryness increase, drainage kinetics (t90) and filtrate suspended solids to compare flocculants and conditions.
• Precision: Validation trials reported average relative repeatability and reproducibility (examples: repeatability ≈4.6% at 30 s, 3.5% at 90 s; reproducibility averages similar). Annexes document apparatus, sample sizing and validation data.

Practical applications

• Flocculant selection and dosing: Rapid lab screening to choose the best polymer and dose before full‑scale trials.
• Process optimisation: Inform design and operation of gravity belt thickeners and other passive dewatering systems.
• Quality control: Routine checks on sludge thickening performance and troubleshooting when drainage degrades.
• Equipment comparison and scale-up: Use results to narrow candidates for pilot or plant-scale testing.

Who should use this standard

• Wastewater treatment plant operators and process engineers
• Laboratory analysts and environmental testing labs
• Flocculant manufacturers and chemical suppliers
• Designers and vendors of sludge dewatering equipment
• Consultants and researchers in wastewater treatment

Related standards

• EN 14701 series (Parts 1–3 for CST, specific resistance to filtration, compressibility)
• EN 14742 (laboratory chemical conditioning)
• EN 15934 (dry matter calculation)
• EN 872 (suspended solids by filtration)
• EN 16323 (wastewater glossary)

Keywords: EN 14701-4:2018, drainability of flocculated sludge, gravity drainage test, filtration properties, sludge characterization, drainability index, flocculant optimization, wastewater sludge.

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
STANDARDSIST EN 14701-4:20101DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14701-4
December
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
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
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 http://www.electropedia.org/
ISO Online browsing platform: available at http://www.iso.org/obp 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
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