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

This European Standard specifies a method for the determination of drainability of flocculated sludges. It is applicable to sludge and sludge suspensions from: a) storm water handling; b) urban wastewater collecting systems; c) urban wastewater treatment plants; d) treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC); e) 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. 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 anderer Herkunft anwendbar.
Auf jeden Fall ist es auf alle Arten von Schlamm anwendbar, vorausgesetzt, die Teilchengröße beträgt mehr als 500 µm. Deshalb sollte die Prüfung vorzugsweise an zuvor ausgeflockten Schlämmen durchgeführt werden.

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

La présente Norme européenne spécifie une méthode de détermination de l'aptitude à l'égouttage des boues
floculées. Elle s'applique aux boues et aux suspensions concentrées issues :
a) de la collecte des eaux pluviales ;
b) de systèmes de collecte des eaux usées urbaines ;
c) de stations d'épuration des eaux usées urbaines ;
d) de l'épuration des eaux usées industrielles semblables aux eaux usées urbaines (définie dans la
Directive 91/271/CEE) ;
e) 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 prepustnosti kosmičenega blata

Ta evropski standard opredeljuje metodo za določevanje prepustnosti kosmičnega blata. Velja za blato in suspenzije blata iz: a) ravnanja z vodo ob neurjih; b) urbanih sistemov zbiranja odpadne vode; c) čistilnih naprav za odpadno vodo; d) obravnavanja industrijske odpadne vode na podoben način kot urbane odpadne vode (kot je opredeljeno v Direktivi 91/271/EGS); čistilnih naprav za sistem oskrbe z vodo. Ta metoda se uporablja tudi za suspenzije blata drugih izvorov.

General Information

Status
Withdrawn
Public Enquiry End Date
09-Mar-2008
Publication Date
15-Jun-2010
Withdrawal Date
07-Mar-2019
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
04-Mar-2019
Due Date
27-Mar-2019
Completion Date
08-Mar-2019

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Charakterisierung von Schlämmen - Filtrationseigenschaften - Teil 4: Bestimmung der Entwässerbarkeit geflockter SchlämmeCaractérisation des boues - Propriétés de filtration - Partie 4: Détermination de l'aptitude a l'égouttage des boues floculéesCharacterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges13.030.20Liquid wastes. SludgeICS:Ta slovenski standard je istoveten z:EN 14701-4:2010SIST EN 14701-4:2010en,fr,de01-julij-2010SIST EN 14701-4:2010SLOVENSKI
STANDARD



SIST EN 14701-4:2010



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14701-4
January 2010 ICS 13.030.20 English Version
Characterization of sludges - Filtration properties - Part 4: Determination of the drainability of flocculated sludges
Caractérisation des boues - Propriétés de filtration - Partie 4: Détermination de l'aptitude à l'égouttage des boues floculées
Charakterisierung von Schlämmen - Filtrationseigenschaften - Teil 4: Bestimmung der Entwässerbarkeit geflockter Schlämme This European Standard was approved by CEN on 28 November 2009.
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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14701-4:2010: ESIST EN 14701-4:2010



EN 14701-4:2010 (E) 2 Contents Page Foreword . 3Introduction . 41 Scope . 52 Normative references . 53 Terms and definitions . 54 Sludge conditioning . 55 Principle . 66 Apparatus . 67 Procedure . 68 Expression of results . 79 Test report . 710 Precision . 8Annex A (informative)
Typical gravity drainage cell . 9Annex B (informative)
Quantity of sludge in a gravity belt filtration . 10Annex C (informative)
Results of validation trials . 11Bibliography . 15 SIST EN 14701-4:2010



EN 14701-4:2010 (E) 3 Foreword This document (EN 14701-4:2010) has been prepared by Technical Committee CEN/TC 308 “Characterization 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 July 2010, and conflicting national standards shall be withdrawn at the latest by July 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. EN 14701, Characterisation of sludges
Filtration properties, consists of the following parts:  Part 1: Capillary suction time (CST)  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, Bulgaria, Croatia, 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 the United Kingdom. SIST EN 14701-4:2010



EN 14701-4:2010 (E) 4 Introduction The determination of drainability of flocculated sludges is an important parameter for evaluating their suitability to be thickened by means of a draining process. It also gives indications for the choice of flocculant or their dosage in view of the thickening of the sludge through a filtering medium. These easy and quick tests are the best means to narrow the number of products to be tested in full scale experiments and to adapt the pre-treatment to the sludge variability. The results obtained are the mass of filtrate collected in a standard time or the time required to recover a given volume of filtrate (commonly 50 % of the water content of the sludge), the maximum volume of filtrate and the corresponding wet and dry mass of the sludge, the undissolved solids remaining in the filtrate and the best flocculant and its optimum dose in the case of comparative tests. SIST EN 14701-4:2010



EN 14701-4:2010 (E) 5 1 Scope This European Standard specifies a method for the determination of drainability of flocculated sludges. It is applicable to sludge and sludge suspensions from:
a) storm water handling; b) urban wastewater collecting systems; c) urban wastewater treatment plants; d) treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271/EEC); e) 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 872, Water quality — Determination of suspended solids — Method by filtration through glass fibre filters EN 12832:1999, Characterization of sludges — Utilization and disposal of sludges — Vocabulary EN 12880, Characterization of sludges — Determination of dry residue and water content CEN/TR 14742, Characterization of sludges — Laboratory chemical conditioning procedure 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 drainability ability of treated sludge to separate from sludge liquor by gravity filtration 3.2 flocculation coagulation by means of inorganic or organic flocculants (polyelectrolytes) 4 Sludge conditioning For flocculation, the sludge shall be sampled already flocculated or mixed with flocculant in repeatable and quantified conditions according to CEN/TR 14742 for a laboratory preparation. SIST EN 14701-4:2010



EN 14701-4:2010 (E) 6 5 Principle A given volume of flocculated sludge is poured in a filter cell equipped with a known filtering medium, the mass of filtrate collected is recorded versus time and the corresponding wet and dry mass of the sludge retained on the filtering medium and the undissolved solids remaining in the filtrate are measured. 6 Apparatus Ordinary laboratory apparatus and the following (see informative Annex A): 6.1 Transparent tube (e.g. glass, polyethylene) of 150 mm diameter and of about 200 mm height, supported by a system composed of a filtering medium tightened in a device equipped with an appropriate sealing joint. 6.2 Filtering medium whose characteristics shall be the same as that used in the full scale drainage device and in comparative tests. 6.3 Filtrate draining device fixed under the filtering medium. 6.4 Beaker for the filtrate collection. 6.5 Weighing balance with an accuracy of at least 0,1 g connected to a computer to continuously record the cumulative mass of filtrate collected over time. The software shall be able to record data every 0,5 s. 6.6 Apparatus for the determination of dry solids content of the sludge retained on the filtering medium. 6.7 Apparatus for the determination of suspended solids in the filtrate. NOTE To allow a correct interpretation of data, the comparison of flocculation conditions should be made with the same test equipment. 7 Procedure a) Prepare the balance and the software to record the mass of filtrate as soon as the first drops of filtrate are collected. b) Measure the water content of the flocculated sludge. c) Gently pour (without shaking) (1 ± 0,2) l of flocculated sludge (record the exact mass) in the centre of the cell for the sludge to recover the whole surface of the filtering medium.
d) Record the cumulative mass of filtrate collected over time every 0,5 s at least during the first 30 s. e) 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. f) Measure the concentration of suspended solids in the filtrate (see EN 872) and the wet and dry mass of the sludge retained on the filter medium (see EN 12880). g) Repeat steps a) to f) for at least twice if repeatability measurements are needed. SIST EN 14701-4:2010



EN 14701-4:2010 (E) 7 8 Expression of results Plot adimensional mass versus time:
()tfMM=0 where M is the mass of filtrate, in grams (g); M0 is the initial mass of sludge, in grams (g); t is the time of experiment, in seconds (s). Record the following data obtained for each test: a) Adimensional mass of filtrate recovered at t = 30 s, t = 90 s and at the end of the test; b) Time necessary to collect a volume of filtrate corresponding to 50 % of the water content of the sludge; c) Dryness of the cake retained on the filtering medium; d) Dry mass of suspended solids per unit volume of filtrate. NOTE The optimal operating conditions of the drainage process are those for which the drainage is the fastest to remo
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