Influence of materials on water intended for human consumption - Influence due to migration - Part 4: Test method for water treatment membranes

This document describes a test method for laboratory evaluation of possible adverse effects of water treatment membrane elements and modules on drinking water quality.
In principle it is applicable to microfiltration, ultrafiltration, nanofiltration, reverse osmosis and electrodialysis modules for use in the treatment of public water supplies and of water inside buildings.
NOTE   Such devices can vary considerably in design and operation and hence some modification of the procedures can be required.
Evaluation of the efficiency of the membrane filter in removing contaminants from the treated water is not included.

Einfluss von Materialien auf Wasser für den menschlichen Gebrauch - Einfluss infolge der Migration - Teil 4: Prüfverfahren für Membranen für die Wasserbehandlung

Dieses Dokument beschreibt ein Prüfverfahren zur Ermittlung möglicher ungünstiger Effekte von Membran¬elementen und  modulen zur Wasserbehandlung auf die Trinkwasserqualität.
Grundsätzlich ist dieses Dokument auf Module zur Mikrofiltration, Ultrafiltration, Nanofiltration, Umkehrosmose und Elektrodialyse anzuwenden, deren Einsatzbereich die Wasserbehandlung in öffentlichen Wasserwerken und in Trink¬wasser-Installationen ist.
ANMERKUNG   Die Geräte können sich in Gestaltung und Bedienung wesentlich unterscheiden und daher können Modifikationen des Prüfverfahrens erforderlich sein.
Eine Bewertung der Wirksamkeit von Membranfiltern zur Entfernung von Verunreinigungen im behandelten Wasser wird nicht vorgenommen.

Influence des matériaux sur l’eau destinée à la consommation humaine - Influence due à la migration - Partie 4: Méthode d’essai des membranes des systèmes de traitement d’eau

Le présent document décrit une méthode d’essai permettant d’évaluer en laboratoire les effets défavorables éventuels causés par les éléments et modules membranaires des systèmes de traitement d’eau sur la qualité de l’eau potable.
En principe, il est applicable aux modules de microfiltration, d’ultrafiltration, de nanofiltration, d’osmose inverse et d’électrodialyse destinés à être utilisés dans le traitement des eaux pour usages publics et de l’eau dans les bâtiments.
NOTE   Étant donné que ces dispositifs peuvent être de conception et de fonctionnement très divers, il peut se révéler nécessaire d’apporter certaines modifications aux modes opératoires.
L’évaluation de l’aptitude de la membrane filtrante à éliminer les contaminants de l’eau traitée n’est pas abordée.

Vpliv materiala na pitno vodo - Vpliv migracije - 4. del: Metoda preskušanja membran za pripravo vode

General Information

Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
17-Nov-2021
Completion Date
17-Nov-2021

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SLOVENSKI STANDARD
oSIST prEN 12873-4:2020
01-november-2020
Vpliv materiala na pitno vodo - Vpliv migracije - 4. del: Metoda preskušanja
membran za pripravo vode

Influence of materials on water intended for human consumption - Influence due to

migration - Part 4: Test method for water treatment membranes

Einfluss von Materialien auf Wasser für den menschlichen Gebrauch - Einfluss infolge

der Migration - Teil 4: Prüfverfahren für Membranen für die Wasserbehandlung

Influence des matériaux sur l’eau destinée à la consommation humaine - Influence due à

la migration - Partie 4: Méthode d’essai des membranes des systèmes de traitement

d’eau
Ta slovenski standard je istoveten z: prEN 12873-4
ICS:
13.060.20 Pitna voda Drinking water
67.250 Materiali in predmeti v stiku z Materials and articles in
živili contact with foodstuffs
oSIST prEN 12873-4:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12873-4:2020
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oSIST prEN 12873-4:2020
DRAFT
EUROPEAN STANDARD
prEN 12873-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 67.250; 13.060.20 Will supersede EN 12873-4:2006
English Version
Influence of materials on water intended for human
consumption - Influence due to migration - Part 4: Test
method for water treatment membranes

Influence des matériaux sur l'eau destinée à la Einfluss von Materialien auf Wasser für den

consommation humaine - Influence due à la migration - menschlichen Gebrauch - Einfluss infolge der Migration

Partie 4: Méthode d'essai des membranes des systèmes - Teil 4: Prüfverfahren für Membranen für die

de traitement d'eau Wasserbehandlung

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 164.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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-CENELEC

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12873-4:2020 E

worldwide for CEN national Members.
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oSIST prEN 12873-4:2020
prEN 12873-4:2020 (E)
Contents Page

European foreword ......................................................................................................................................... 3

Introduction ...................................................................................................................................................... 4

1 Scope ............................................................................................................................................................ 5

2 Normative references ............................................................................................................................ 5

3 Terms and definitions ........................................................................................................................... 5

4 Test method .............................................................................................................................................. 7

4.1 Principle .................................................................................................................................................. 7

4.2 Reagents and apparatus .................................................................................................................... 7

4.3 Test samples .......................................................................................................................................... 9

4.4 Procedure ............................................................................................................................................... 9

5 Analysis .................................................................................................................................................... 13

6 Expression of results .......................................................................................................................... 13

6.1 Concentrations in the analytical samples ................................................................................ 13

6.2 Daily migration rates ...................................................................................................................... 14

7 Test report .............................................................................................................................................. 14

Annex A (informative) Diagram of the test procedure .................................................................. 16

Annex B (informative) Schematic diagram of an example test rig ............................................ 17

Bibliography ................................................................................................................................................... 18

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oSIST prEN 12873-4:2020
prEN 12873-4:2020 (E)
European foreword

This document (prEN 12873-4:2020) has been prepared by Technical Committee CEN/TC 164 “Water

supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12873-4:2019.

It has been drawn up with the objective to describe a test method to determine the migration of

substances from water treatment membranes.

Annex A, which is informative, provides a flow diagram of the steps in the test procedure.

Annex B, which is informative, describes a test rig.

This document is the fourth in a series of standards dealing with the influence of migration from

materials on water intended for human consumption, including:
Part 1 Test method for non-metallic and non-cementitious factory made products;

Part 2 Test method for non-metallic and non-cementitious site-applied materials;

Part 3 Test method for ion exchange and adsorbent resins;
Part 4 Test method for water treatment membranes.

Significant technical difference between this edition and EN 12873-4:2019 is as follows:

New definitions and editorial changes to existing definitions
Change to temperature of operation if not provided by the manufacturer
General editorial, structural and clarification throughout the document.
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Introduction

In respect of potential adverse effects on the quality of water intended for human consumption caused

by the materials, it is called to mind that, while awaiting the adoption of verifiable European acceptance

criteria, the relevant national regulations remain in force.
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prEN 12873-4:2020 (E)
1 Scope

This document describes a test method for laboratory evaluation of possible adverse effects of water

treatment membrane elements and modules on drinking water quality.

In principle it is applicable to microfiltration, ultrafiltration, nanofiltration, reverse osmosis and

electrodialysis modules for use in the treatment of public water supplies and of water inside buildings.

NOTE Such devices can vary considerably in design and operation and hence some modification of the

procedures can be required.

Evaluation of the efficiency of the membrane filter in removing contaminants from the treated water is

not included.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 ISO 3696:1995, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
analytical sample

portion of the migration water collected for the determination of specified water quality parameters

3.2
cell pair

basic unit of electrodialysis systems consisting of a cation transfer membrane, a dilute flow (product)

spacer, an anion transfer membrane and a concentrate (waste) spacer
3.3
cleaning and/or disinfection agent

chemical solution passed through the membrane element/module either in response to changes in the

performance of the membrane or at fixed times or volumes to remove solids or biofilm build up from

the membrane to improve efficiency
3.4
concentrate

permeate and reject water returned to the reservoir of test water to be pumped back through the

membrane element/module resulting in a concentration of migrating substances from the membrane

element/module
3.5
dead volume

volume of water contained in a membrane element/module (but not including pumps, valves and other

ancillaries connected to the membrane element/module) during normal use
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prEN 12873-4:2020 (E)
3.6
electrodialysis

process in which ionic species in a feed water are transferred by means of an electrical driving force via

a membrane, which is either cation or anion specific, to a waste water stream
3.7
feed water
inlet water for the test rig (see diagram in Annex B)
3.8
flushing water
water used for preconditioning and rinsing
3.9
migration test

determination of the effects on parameters of water quality following contact with the test sample

under specified conditions
3.10
migration

movement of a substance or substances from test samples into migration water 3.11

3.11
migration water
test water after exposure to the test sample under specified conditions
3.12
membrane element/module

filtration unit including the membrane itself and all parts of its housing and fittings

3.13
procedural blank

test water after contact with the test rig but not with the test sample under the same conditions used

for the migration test
3.14
product

manufactured item, in its finished form, that comes into contact with drinking water

3.15
permeate water
treated water from the product that has passed through the membrane
3.16
reject water

tangential water that does not flow through the membrane and becomes the waste stream under

normal operation of the product
3.17
storage solution

solution which fills the dead space in a membrane element/module added by the manufacturer after

manufacture to preserve the membrane during distribution, sometimes storage solutions are also

added to partially used membrane element/module for storage when not in use
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prEN 12873-4:2020 (E)
3.18
test rig

equipment, which is not part of the test sample, used to perform the test and control test conditions

3.19
test sample

product, or part of a product, submitted for testing for suitability for use in contact with water intended

for human consumption
3.20
test water
water used for migration testing (see 4.2.2)
4 Test method
4.1 Principle

Water of specified quality is run through a membrane element or module under specified operating

conditions representing as much as possible the actual conditions of use. The procedure comprises

several steps including flushing, operation with and without recycling and cleaning and/or disinfection,

the latter depending on the manufacturers recommendations. The purpose of the recycling phase is to

concentrate the potential contaminants migrating from the test sample. Analytical samples of the

concentrates and the single-pass migration waters are taken for analysis.

The operating test temperature is maintained at the highest temperature approved by the

manufacturer. In the absence of a recommended temperature it is (20 ± 5) °C.
A schematic diagram of the test protocol is shown in Annex A.

Membrane technology can be different in design and operation and therefore the procedures described,

such as operation conditions and cleaning, may need to be modified in some cases.

4.2 Reagents and apparatus
4.2.1 General

Only reagents of analytical grade shall be used, except where specified otherwise. All reagents shall be

of sufficient purity to ensure that they do not give rise to interferences during the analysis of the

extracts.

NOTE Contamination can arise from various sources, e.g. plastics or rubber materials. The use of procedural

blanks and laboratory blanks assists in detecting any contamination and identifying its source.

4.2.2 Test water

The test water shall consist of purified water conforming to grade 3 of EN ISO 3696 with an electrical

conductivity not exceeding (10 ± 0,1) µS/cm. It shall be free from organic contaminants that can

interfere with the analysis of the analytical samples.

If testing with chlorinated test water is required then use test water having an active chlorine content of

(1 ± 0,2) mg/l as Cl shall be used.

When testing electrodialysis modules the test water shall contain (1 ± 0,1) g/l of NaCl.

NOTE Purification of water, such as tap water, by a sequence consisting of carbon filtration, reverse osmosis

or distillation and followed by deionization usually produces satisfactory test water.

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prEN 12873-4:2020 (E)
4.2.3 Flushing water

The flushing water shall be test water (4.2.2) or tap water, provided that the following conditions are

complied with:
— total organic carbon content of (<1,0 mg/l ± 0,1 mg/l) carbon;
conductivity of < 500 µS/cm;

it is free from organic contaminants that can interfere with the analysis of the extracts;

flushing is finished with a volume of the test water, corresponding to at least (5 ± 0,5)% of the total

volume used for flushing.

NOTE A flushing with 1000 l would consist of 950 l of flushing water followed by 50 l of test water.

For products not intended for use in contact with chlorinated water only unchlorinated flushing water

shall be used.
4.2.4 Cleaning and/or disinfection agent

The type and use of agents to clean and/or disinfect the test sample shall be as recommended by the

manufacturer.
4.2.5 Test rig

The test rig used depends on the product under test. The design and operation of the test rig for the

membrane element/module under test shall reproduce as far as practical the conditions of actual use in

service. In particular, testing shall be carried out under the same conditions, as for actual use, for the

following:
a) start-up procedure;
b) use of cleaning and/or disinfection agents;
c) operating conditions, as relevant.

As an example the test rig may include a pump, a reservoir of test water, pressure gauges, flow meters,

sampling taps and connecting pipes and fittings. The rig shall allow temperature control, sampling of

the permeate water, re-circulation of the permeate water and, where relevant, of the reject water or

concentrate over a period of 24 h. The re-circulation reservoir should hold sufficient volume of the feed

water to allow at least 30 min operation at the minimum recommended flow. The different parts of the

test rig shall be inert towards the test water used.
NOTE A schematic diagram of an example test rig is shown in Annex B.
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4.3 Test samples
4.3.1 General requirements
Test samples shall be taken from normal production batches.

Where a test sample cannot be taken from a production batch an alternative sample is permitted

together with any necessary changes to the test procedure. Such modifications shall be fully described

in the Test Report.

Test samples shall be representative of production batches and shall have received no other treatment,

unless part of the manufacturer’s instructions for use.

The manufacturer's product manual, as supplied to customers, shall be consulted for the procedures for

installation, flushing, chemical treatment and/or disinfection and operation. The following information,

depending on the particular membrane device, is required:
...

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