EN 16720-1:2016

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Charakterisierung von Schlämmen - Physikalische Beschaffenheit - Teil 1: Bestimmung des Fließverhaltens - Verfahren mit Gerät mit ExtrusionsrohrCaractérisation des boues - Consistance physique - Partie 1: Détermination de l'aptitude à l'écoulement - Méthode utilisant un appareil à tube d'extrusionCharacterization of sludges - Physical consistency - Part 1: Determination of flowability - Method by extrusion tube apparatus13.030.20Liquid wastes. SludgeICS:Ta slovenski standard je istoveten z:EN 16720-1:2016SIST EN 16720-1:2017en,fr,de01-april-2017SIST EN 16720-1:2017SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16720-1
May
t r s x ICS
s uä r u rä t r English Version
Characterization of sludges æ Physical consistency æ Part
sã Determination of flowability æ Method by extrusion tube apparatus Caractßrisation des boues æ Consistance physique æ Partie
sã Dßtermination de l 5aptitude à l 5ßcoulement æ Mßthode utilisant un appareil à tube d 5extrusion
Charakterisierung von Schlämmen æ Physikalische Beschaffenheit æ Teil
sã Bestimmung des Fließverhaltens æ Verfahren mit Gerät mit Extrusionsrohr This European Standard was approved by CEN on
s { March
t r s xä
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
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t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x y t ræ sã t r s x ESIST EN 16720-1:2017

European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 4 Principle . 6 5 Equipment . 6 6 Test sample . 7 7 Procedure . 7 8 Expression of the results. 7 9 Precision . 8 10 Test report . 8 Annex A (informative)
Flow behaviour of fluids . 9 Annex B (informative)
Extrusion tube apparatus . 10 Annex C (informative)
Results of validation trials . 12 Bibliography . 16
3 European foreword This document (EN 16720-1:2016) has been prepared by Technical Committee CEN/TC 308 “Characterization and management of sludge”, 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 November 2016 and conflicting national standards shall be withdrawn at the latest by November 2016. 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 16720, Characterization of sludges - Physical consistency consists of the following two parts: — Part 1: Determination of flowability - Method by extrusion tube apparatus
— Part 2: Determination of solidity (in preparation) 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16720-1:2017

5 1 Scope This part of the European Standard specifies a method for determining the flowability, as defined in CEN/TR 15463, of sludge by means of the extrusion tube apparatus. This part of this European Standard is applicable to sludge and sludge suspensions from: — storm water handling; — urban wastewater collecting systems; — urban wastewater treatment plants; — 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 and sludge suspensions of other origins. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 16323:2014, Glossary of wastewater engineering terms CEN/TR 15463:2007, Characterization of sludges - Physical consistency - Thixotropic behaviour and piling behaviour 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 16323:2014 and the following apply. 3.1 dynamic viscosity ratio of the applied shear stress to the shear rate (velocity gradient) in a rotating viscometer Note 1 to entry: Dynamic viscosity is the measure of the resistance to flow of a liquid. 3.2 flowability index Fi parameter indicating whether a sludge is in the “liquid” physical state or not, i.e. is able to flow under the effect of gravity or pressure below a certain threshold 3.3 non-Newtonian fluid fluid having a non-constant shear stress to shear rate ratio SIST EN 16720-1:2017

7 6 Test sample Sufficient volume of the test sample to fill up the apparatus (about 3 l) is required. The presence of coarse particles or lumps of aggregate in the suspension can cause clogging phenomena. If necessary, the sample shall be sieved to exclude particles larger than 2,5 mm (see 5.4). Furthermore, test could be negatively affected by fast-settling particles, clogging phenomena and presence of air bubbles, especially in the discharge pipes. Pour carefully the sludge in the cylinder along the wall to minimize bubbles. If necessary, homogenization at adequate stirring speed in the cylinder should be guaranteed to limit settling. Pre-sieving could limit clogging, but if it appears during test appropriate de-clogging actions could be adopted. 7 Procedure 7.1 Level the apparatus to assure verticality. 7.2 Fill up the cylinder with the sample by keeping closed the end side of the pipe(s) fitted at the bottom and while avoiding the presence of air bubbles. Make the transfer in such a manner that the sample will be manipulated as little as possible. 7.3 Let the flow start from the discharge pipe with diameter of 20 mm until flow becomes clearly discontinuous or intermittent, i.e. when the flow is reduced to one drop falling per second. At this time stop the flow and measure the height of the sludge remaining in the cylinder above the upper side, not the center, of the discharge pipe. 7.4 Repeat steps 7.1 to 7.3 with the 20 mm diameter pipe. 7.5
If the above measured 2 values differ by more than 1 cm from their mean value when it is
¶ w cm or 20 % from their mean value when it is >5 cm, repeat steps 7.1 to 7.3 in order to have at least two significant values. 7.6 Repeat steps 7.1 to 7.5 with the 10 mm diameter pipe. 7.7 Repeat steps 7.1 to 7.5 with the 5 mm diameter pipe. The standard temperature condition of the test shall be (20 ± 0,5) °C. If any other temperature is used, it shall be included in the test report. 8 Expression of the results By measuring the height of the sludge remaining in the cylinder at the end of the test above the discharge pipe, the flowability index (Fi) can be calculated through Formula (1): ρ=××××iFghrl3/8/ (1) where Fi is the flowability index, in Pa; 3/8 is the hydraulic equation ratio for laminar flow (this is generally the case of sludge having yield stress);
is the sludge density, in kg/m3; g is the gravity acceleration, in m/s2; SIST EN 16720-1:2017
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