prEN 18087

SLOVENSKI STANDARD
01-september-2024
Naprave za proizvodnjo biocidov na kraju samem - Klorov dioksid, proizveden iz
natrijevega klorida z acidifikacijo (nakisanjem) ali oksidacijo
Devices for in situ generation of biocides - Chlorine dioxide generated from sodium
chlorite by acidification or oxidation
Anlagen zur In-Situ-Erzeugung von Bioziden - Chlordioxid, hergestellt aus Natriumchlorit
durch Ansäuren oder Oxidation
Équipements pour la production in situ de biocides - Dioxyde de chlore produit par
acidification ou oxydation de chlorite de sodium
Ta slovenski standard je istoveten z: prEN 18087
ICS:
13.060.20 Pitna voda Drinking water
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2024
ICS 71.100.80
English Version
Devices for in situ generation of biocides - Chlorine dioxide
generated from sodium chlorite by acidification or
oxidation
Équipements pour le production in situ de biocides - Anlagen zur In-Situ-Erzeugung von Bioziden -
Dioxyde de chlore produit par acidification ou Chlordioxid, hergestellt aus Natriumchlorit durch
oxydation de chlorite de sodium Säurezugabe oder Oxidation
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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18087:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Processes for the preparation of chlorine dioxide solutions . 9
4.1 General. 9
4.2 Properties . 9
4.3 Requirements for the generation of chlorine dioxide . 11
4.4 Chlorite-Acid-Process (Chlorine dioxide generated from sodium chlorite by
acidification) . 12
4.4.1 Reaction conditions for the generation of chlorine dioxide. 12
4.4.2 Selection of the system . 12
4.5 Chlorite-chlorine gas process and chlorite-sodium peroxodisulphate process
(chlorine dioxide generated from sodium chlorite by oxidation) . 17
4.5.1 Chlorite-chlorine gas process . 17
4.5.2 Chlorite sodium peroxodisulphate process . 20
4.6 Requirements for the chlorine dioxide dosing point of continuously operating
systems . 28
4.7 Buffer tank . 29
4.7.1 General. 29
4.7.2 Requirements for the buffer tank . 29
4.7.3 Measures against release of gaseous chlorine dioxide . 29
4.7.4 Requirements for the chlorine dioxide dosing device . 30
4.8 Safety bunds . 30
4.9 Prevention against backflow . 31
4.10 Purification process . 31
4.10.1 General. 31
4.10.2 Technical execution . 31
4.10.3 Requirements for purification processes . 32
5 Materials for chlorine dioxide systems . 33
6 Equipment for the housing or area for the installation of the chlorine dioxide system . 33
7 Operation and maintenance . 33
8 Documentation . 34
9 Test requirements . 35
9.1 General. 35
9.2 Scope of testing . 35
9.3 System documentation . 35
9.4 Chemical characterization . 35
9.4.1 General. 35
9.4.2 Sampling . 36
9.4.3 Determination of pH value and temperature . 38
9.4.4 Chemical characterization of the chlorine dioxide solution generated by the chlorite-
acid and chlorite-chlorine-gas processes. . 38
9.4.5 Chemical characterization of the chlorine dioxide solution prepared by the chlorite-
sodium peroxodisulphate process . 45
9.5 Yield of chlorine dioxide generation . 47
9.5.1 General . 47
9.5.2 Calculation of the yield . 47
Annex A (informative) Decomposition conditions for chlorine dioxide in solution . 48
Annex B (informative) Determination of chlorine dioxide in solutions in the concentration
range 0,05 mg/l to 10 mg/l . 49
Annex C (informative) Determination of chlorine dioxide in solutions within the
concentration range 10-30 mg/l . 51
Bibliography . 53

European foreword
This document (prEN 18087:2024) 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.
Introduction
In respect of potential adverse effects on human and animal health and the environment, caused by the
product covered by this document, it provides no information as to whether the product may be used
without restriction in any of the Member States of the EU or EFTA.
NOTE while awaiting the adoption of verifiable European criteria, attention is also drawn to national
regulations that can apply.
Systems according to this document may be used in different fields of application, e.g. drinking water,
swimming pool water, wastewater, air treatment, surface disinfection, etc. Additional requirements to
this document should be observed, where appropriate for the specific application.
1 Scope
This document contains requirements for dosing systems for chlorine dioxide generation according to
the chlorite-chlorine gas process, the chlorite-acid process and the chlorite-sodium peroxodisulphate
process, which are used for the disinfection and oxidation of substances in water.
The chlorine dioxide (ClO ) solution is produced on site (in situ) by automated mixing of chemical
precursors. This document applies to the treatment of water for human consumption, rinsing water for
filters for swimming and bathing pools as well as for other uses (e.g. cooling water, process water, etc.
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 901, Chemicals used for treatment of water intended for human consumption — Sodium hypochlorite
EN 937, Chemicals used for treatment of water intended for human consumption — Chlorine
EN 938, Chemicals used for treatment of water intended for human consumption — Sodium chlorite
EN 939, Chemicals used for treatment of water intended for human consumption — Hydrochloric acid
EN 1717, Protection against pollution of potable water in water installations and general requirements of
devices to prevent pollution by backflow
EN 12671, Chemicals used for treatment of water intended for human consumption — Chlorine dioxide
generated in situ
EN 12926, Chemicals used for treatment of water intended for human consumption — Sodium
peroxodisulfate
EN 15363, Chemicals used for treatment of swimming pool water — Chlorine
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696)
EN ISO 10304-4, Water quality — Determination of dissolved anions by liquid chromatography of ions —
Part 4: Determination of chlorate, chloride and chlorite in water with low contamination (ISO 10304-4)
EN ISO 12100, Safety of machinery — General principles for design - Risk asse
...