EN 17971:2024

SLOVENSKI STANDARD
01-september-2024
Naprave za proizvodnjo biocidov na kraju samem - Ozon
Devices for in-situ generation of biocides - Ozone
Anlagen zur In-Situ Erzeugung von Bioziden - Ozon
Dispositifs de génération de biocides in situ - Ozone
Ta slovenski standard je istoveten z: EN 17971:2024
ICS:
13.060.20 Pitna voda Drinking water
13.060.25 Voda za industrijsko uporabo Water for industrial use
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17971
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2024
EUROPÄISCHE NORM
ICS 13.060.20
English Version
Devices for in-situ generation of biocides - Ozone
Dispositifs de génération de biocides in situ - Ozone Anlagen zur In-Situ Erzeugung von Bioziden - Ozon
This European Standard was approved by CEN on 19 May 2024.

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-CENELEC 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-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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17971:2024 E
worldwide for CEN national Members.

Contents          Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Technology of dielectric barrier discharge to generate ozone . 8
5 Distinguishing characteristics of ozone generation devices . 9
5.1 General. 9
5.2 Design type of the ozone generation devices . 9
5.3 Operating pressure . 9
5.4 Feed gas . 10
5.5 Cooling of the ozone generator . 10
6 Technical data of the ozone generation device . 10
7 Name-plate . 11
8 Equipment and materials of ozone systems . 12
8.1 General. 12
8.2 Equipment for the supply of feed gas . 12
8.3 Equipment for cooling of the ozone generator . 12
8.4 Materials . 12
8.4.1 Materials for parts in contact with feed gas . 12
8.4.2 Materials for parts in contact with ozone . 12
8.5 Electrical equipment. 12
8.6 Control and monitoring . 13
8.7 Residual ozone destructor . 13
9 Chemistry . 13
9.1 Chemistry of ozone generation . 13
9.2 Purity requirements for the feed gas . 15
9.3 Chemistry of reaction by-products of ozone generation . 16
9.4 Chemistry of by-products of ozone dosed in water . 16
10 Device for dosing ozone . 17
11 Installation site . 17
12 Cooling agent . 18
13 Operational safety requirements of ozone systems . 18
14 Operation and maintenance . 20
15 Testing of ozone generation devices for its characterization . 20
15.1 General. 20
15.2 Scope of testing . 20
15.3 Check of documentation and design . 21
16 Nominal output of the ozone generation . 21
16.1 Determination of the nominal output of the ozone generation device . 21
16.2 Determination of the volumetric flow rate Q . 22
out
16.3 Photometric determination of the ozone concentration γ by UV absorption. 23
n
16.3.1 Brief description of the method . 23
16.3.2 Procedure and evaluation . 25
16.4 Determination of the ozone concentration γ by titration . 26
n
16.4.1 Brief description . 26
16.4.2 Apparatus . 26
16.4.3 Reagents . 27
16.4.4 Procedure . 27
16.4.5 Evaluation. 29
Annex A (informative) Examples for mixing devices . 30
A.1 Mixing by injector and static mixer. 30
A.2 Multiphase pumps . 31
A.3 Direct injection and static mixer . 31
A.4 Additional mixing methods . 32
Annex B (normative) Methods to determine ozone in water . 34
B.1 DPD Method . 34
B.2 Indigo Method . 34
B.3 potentiometric Method. 35
Annex C (informative) Safety measures to prevent ozone leakages . 36
Bibliography . 38
European foreword
This document (EN 17971:2024) has been prepared by Technical Committee CEN/TC 164“Water
supply”, 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 2024, and conflicting national standards shall
be withdrawn at the latest by December 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
Devices according to this document can be used in different fields of application, e.g. drinking water,
swimming pool water, wastewater, air treatment, surface disinfection, water reuse, irrigation water and
within food and beverage manufacturing, etc. Additional requirements to this document need to be
observed, where appropriate for the specific application.
The in situ generation of active substances, in particular ozone, is subject to the specifications of the
Biocidal Products Regulation (EU) 528/2012 (BPR) [1]. The use of ozone for the purpose of
disinfection/microbiological preservation of water implies compliance with the provisions of the BPR, in
particular access by the user or the device manufacturer to a data set required for the authorization of
ozone under the BPR.
The in situ generation of ozone for non-biocidal applications, e.g. oxidation purposes, is subject to the
specifications of the REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) [2]
Regulation (EC) 1907/2006. The use for non-biocidal purposes implies access by the user to the data set
provided for the authorization of ozone under REACH.
1 Scope
This document is applicable to devices for the generation and dosing of ozone. The ozone is generated in
these devices according to the technology of dielectric barrier discharge. According to EN 1278 and
EN 15074, ozone is suited for the use of the treatment of water intended for human consumption
(drinking water), and for the treatment of swimming pool water respectively. Ozone can be added to the
water for disinfection and for oxidative purposes. This document can also be applied for other
technologies to generate ozone, e.g. electrolysis or UV irradiation, as far as reasonable or applicable.
This document specifies device’s construction, and test methods for the equipment used for in situ
...