Bsi bs en 14701 3 2006 (2007)

EN 14701 3 2006 64 e stf BRITISH STANDARD BS EN 14701 3 2006 Characterization of sludges — Filtration properties — Part 3 Determination of the compressibility The European Standard EN 14701 3 2006 has[.]

BRITISH STANDARD BS EN

14701-3:2006

Characterization of

sludges — Filtration

properties —

Part 3: Determination of the

compressibility

The European Standard EN 14701-3:2006 has the status of a

British Standard

ICS 13.030.20

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BS EN 14701-3:2006

This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee

on 30 April 2007

© BSI 2007

ISBN 978 0 580 50508 9

National foreword

This British Standard was published by BSI It is the UK implementation of

EN 14701-3:2006

The UK participation in its preparation was entrusted to Technical Committee EH/5, Sludge characterization

A list of organizations represented on EH/5 can be obtained on request to its secretary

The UK committee has never seen the need to standardize this method at a European level and, as a consequence, has not been actively involved in the development of this standard However, the UK committee is pleased that a classic British method was selected The method has long been used as a valuable operational-control method and is available in existing technical literature (see reference [1] in the bibliography of this standard) Due to the difficulty and cost of sending liquid sludge samples (in such a manner that their properties do not change) to laboratories for international interlaboratory trials of the performance of this method, interested parties convened at a workshop to assess the test Their conclusion was that the results are operationally defined (e.g by the filter paper used) and, as the document does not specify all such operational details, the performance data are not really applicable outside the context of the workshop As a result, the members of EH/5 have no information to offer on the reproducibility of the results

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard cannot confer immunity from legal obligations.

Amendments issued since publication

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 14701-3

June 2006

ICS 13.030.20

English Version

Characterization of sludges - Filtration properties - Part 3:

Determination of the compressibility

Caractérisation des boues - Propriétés de filtration - Partie

3 : Détermination de la compressibilité Filtrationseigenschaften - Teil 3: Bestimmung derCharakterisierung von Schlämmen

-Kompressibilität

This European Standard was approved by CEN on 24 May 2006.

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 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.

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 STANDARDIZATION

C O M I T É E U R O P É E N D E N O R M A L I S A T I O N

E U R O P Ä IS C H E S K O M IT E E FÜ R N O R M U N G

Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2006 CEN All rights of exploitation in any form and by any means reserved

EN 14701-3:2006 (E)

2

Foreword 3

Introduction 4

1 Scope 5

2 Normative references 5

3 Terms and definitions 5

4 Principle 5

5 Apparatus 5

6 Procedure 6

7 Expression of results 6

8 Precision 6

9 Test report 6

Bibliography 7

EN 14701-3:2006 (E)

3

Foreword

This document (EN 14701-3:2006) 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 December 2006, and conflicting national standards shall be withdrawn

at the latest by December 2006

Other parts of this European Standard are:

 Part 1: Capillary suction time (CST);

 Part 2: Determination of the specific resistance to filtration

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 14701-3:2006 (E)

4

Introduction

The measurement of compressibility is complementary to that of specific resistance to filtration (see

EN 14701-2) The scope of this determination is to evaluate the best range of pressure to be adopted for filtration This parameter can be used together with other parameters to evaluate the performance of full-scale filtration devices

EN 14701-3:2006 (E)

5

1 Scope

This document specifies a method to determine the compressibility of sludges, conditioned or not

This document is applicable to sludges 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 and sludge suspensions of 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

EN 14701-2:2006, Characterization of sludges — Filtration properties — Part 2: Determination of the specific

resistance to filtration

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

compressibility

ability of a suspension to be compressed under pressure

3.2

compressibility coefficient

slope of the straight line obtained by plotting a log-log scale the specific resistance to filtration versus pressure

4 Principle

Measurement of the specific resistance to filtration of a sludge at different pressures

5 Apparatus

Filtration apparatus as described in 5.1.2, 5.1.3, 5.2 and 5.4 to 5.8 of EN 14701-2:2006

EN 14701-3:2006 (E)

6

6 Procedure

Measure the values of the specific resistance to filtration at least at three different pressures, following the

procedure reported in the relevant method (see 6.2 or 6.3 of EN 14701-2:2006) The following values are

suggested: 50 kPa, 150 kPa and 500 kPa

7 Expression of results

The coefficient of compressibility, s is related to the applied pressure p by the equation (1):

s p

o

r

where

ro is the specific resistance to filtration at pressure = 100 kPa;

r is the specific resistance to filtration at pressure p;

p is the pressure drop across the cake and cloth in Pascals (Pa);

s is the coefficient of the compressibility

Introducing logarithms, results:

p log s o r log

r

Plotting on a log-log scale diagram r versus p, a straight line having a slope s is obtained The value of s is

calculated considering two points of the line r-p having respectively, co-ordinates (r1, p1) and (r2, p2) by

equation (3):

) 1 / 2 p /(log ) 1 r / 2

r

(log

NOTE Values of s higher than 1 indicate an increase of the specific resistance to filtration more than proportional to

the pressure, thus it is not convenient to operate at high pressures (see clause 6)

8 Precision

Precision is referred to that of the Determination of the specific resistance to filtration (EN 14701-2)

9 Test report

The test report shall contain the following information:

a) reference to this document;

b) all information necessary for the complete identification of the sample;

c) method with a reference to this document;

d) test results obtained;

e) any detail not specified in this document or which is optional and any other factor which may have

affected the results

EN 14701-3:2006 (E)

7

Bibliography

[1] Tiller, F.M., Theory and Practice of Solid-Liquid Separation, University of Houston,A72, 544 pp., Houston Texas (1975)

[2] 91/271/EEC, COUNCIL DIRECTIVE of 21 May 1991 concerning urban waste water treatment

BS EN

14701-3:2006

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