ISO 24261-1:2020

Fine bubble technology — Elimination method for sample characterization — Part 1: Evaluation procedure

This document specifies the evaluation procedure of fine bubble elimination for fine bubble dispersion in water. This document is applicable only to fine bubbles without shell.

Technologie des fines bulles — Méthode d'élimination pour la caractérisation de l'échantillon — Partie 1: Mode opératoire d'évaluation

General Information

• Status: Published
• Publication Date: 12-Nov-2020
• ICS: 07.030 - Physics. Chemistry
• Technical Committee: ISO/TC 281 - Fine bubble technology
• Drafting Committee: ISO/TC 281/WG 2 - Fine bubble characterization and measurement
• Current Stage: 6060 - International Standard published
• Start Date: 13-Nov-2020
• Due Date: 02-Jul-2022
• Completion Date: 13-Nov-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 24261-1
First edition
2020-11
Fine bubble technology — Elimination
method for sample characterization —
Part 1:
Evaluation procedure
Technologie des fines bulles — Méthode d'élimination pour la
caractérisation de l'échantillon —
Partie 1: Mode opératoire d'évaluation
Reference number
ISO 24261-1:2020(E)
©
ISO 2020

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ISO 24261-1:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 24261-1:2020(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 1
4.1 Sample . 1
4.2 Measuring instruments . 2
5 Environment . 2
6 Evaluation of fine bubble elimination efficiency . 2
6.1 General . 2
6.2 Reduction rate . 2
6.3 Confirmation of contaminants aggregation . 3
6.4 E valuation procedure of fine bubble elimination . 3
7 Test report . 4
7.1 Report of the testing results . 4
7.2 Report of the testing conditions . 4
Annex A (informative) Simulations of fine bubble elimination process . 5
Annex B (informative) Decrease of concentration caused by fine bubble elimination and
aggregation . 7
Bibliography .10
© ISO 2020 – All rights reserved iii

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ISO 24261-1:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 281 Fine bubble technology.
A list of all parts in the ISO 24261 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

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ISO 24261-1:2020(E)

Introduction
Fine bubble technology has recently seen growth in its application to markets in cleaning, water
treatment, agriculture, and aquaculture as well as biomedical fields. Now, methods are required to
evaluate the generation systems. Especially characteristics like the number concentration index and
the size index of fine bubbles are indispensable for those evaluations.
Furthermore, fine bubble dispersion water may contain other solid and liquid particles. Clearly due to
this is a concern, as it may be impossible to evaluate the characteristics of fine bubbles. Therefore, it is
an urgent task to address this concern.
There are several measurement methods widely used to evaluate the number concentration index
and the size index of particles. However, there are few methods to distinguish bubbles in fine bubble
dispersions from other particles.
This issue can be resolved, using the phenomenon by which the bubbles can be eliminated without any
residues after dissolution and flotation. If a method that eliminates fine bubbles in specific size range
is known, it is possible to distinguish fine bubbles from other solid and liquid particles. The eliminated
particles can be fine bubbles. If most of fine bubbles decreased, a solution that doesn’t have them can
be used as a blank solution for measurements as background. Because it is expected that fine bubbles
elimination techniques will develop further, standardizing elimination techniques and evaluation
method is required.
This document is intended to specify the evaluation method for elimination efficiency of fine bubbles
from fine bubble dispersions in water.
Standardization for evaluating elimination efficiency of fine bubbles enables easy and clear comparison
among the several elimination techniques and realizes the optimization of conditions for respective
elimination techniques.
© ISO 2020 – All rights reserved v

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INTERNATIONAL STANDARD ISO 24261-1:2020(E)
Fine bubble technology — Elimination method for sample
characterization —
Part 1:
Evaluation procedure
1 Scope
This document specifies the evaluation procedure of fine bubble elimination for fine bubble dispersion
in water. This document is applicable only to fine bubbles without shell.
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.
ISO 20480-1, Fine bubble technology — General principles for usage and measurement of fine bubbles —
Part 1: Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20480-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
elimination of fine bubbles
process for decrease of the concentration index of fine bubbles
3.2
fine bubble dispersion
FBD
liquid which contains fine bubbles
[SOURCE: ISO 20298-1:2018, 3.1]
4 Requirements
4.1 Sample
The fine bubble dispersion to be evaluated shall be generated by cleaned fine bubble generating systems
using pure water and pure gas such as air, nitrogen and oxygen.
The purity level of water and gas depends on the sample whose size and concentration indices of
fine bubbles should be evaluated because fine bubble elimination is one of the evaluating process for
specified samples. So, the purity level cannot be generally determined as measurement condition for
evaluations of the elimination efficiency.
© ISO 2020 – All rights reserved 1

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ISO 24261-1:2020(E)

The fine bubble dispersion shall not contain stabilizing agents.
If the measurement accuracy of size and concentration indices is very important (e.g. for accreditation
purposes), a water purity level of Grade 1 according to ISO 3696 is recommended for the water used for
generation of FBD.
4.2 Measuring instruments
When the measuring instruments are selected for evaluating fine bubble elimination for FBD in water
the following parameters about concentration and size range shall be confirmed, which depends on the
characteristics of the sample to be evaluated.
a) Total number concentration and/or total volume concentration including fine bubbles and
contaminants such as solid particles and liquid particles can be measured. Water diluent can be
used for diluting the FBD in water when the concentration is over the measuring range.
b) Total size range including fine bubbles, contaminants and aggregates of contaminants can be
measured. Another measuring instrument can be used to confirm the larger aggregates.
EXAMPLE Particle tracking analysis method can be used for evaluation of number concentration, and laser
diffraction method can be used for evaluation of volume concentration. ISO/TR 23015 can be referred to for
details of measurement techniques which can be used for FBD in water.
5 Envir
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 24261-1
ISO/TC 281 Secretariat: JISC
Voting begins on: Voting terminates on:
2020-01-31 2020-04-24
Fine bubble technology — Elimination method for sample
characterization —
Part 1:
Evaluation procedure
ICS: 07.030
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 24261-1:2020(E)
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. ISO 2020

---------------------- Page: 1 ----------------------
ISO/DIS 24261-1:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DIS 24261-1:2020(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 1
4.1 Sample . 1
4.2 Measuring instruments . 2
5 Environment . 2
6 Evaluation of fine bubble elimination efficiency . 2
6.1 General . 2
6.2 Reduction rate . 2
6.3 Confirmation of contaminants aggregation . 3
6.4 Evaluation procedure of fine bubble elimination . 3
7 Report . 4
7.1 Report of the testing results . 4
7.2 Report of the testing conditions . 4
Annex A (informative) Simulations of fine bubble elimination process . 5
Annex B (informative) Decrease of concentration caused by fine bubble elimination and
aggregation . 7
Bibliography . 9
© ISO 2020 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/DIS 24261-1:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 281 Fine bubble technology.
A list of all parts in the ISO 20480 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/DIS 24261-1:2020(E)

Introduction
Fine bubble technology has recently seen grown in its application to markets in, cleaning, water
treatment, agriculture, and aquaculture as well as biomedical fields. Now methods are required to
evaluate the generation systems. Especially the characteristics like the number concentration index of
fine bubbles and the size index of them are indispensable for those evaluations.
Furthermore, fine bubble dispersion water may contain other solid and liquid particles. Clearly due to
this is a concern, as it may be impossible to evaluate the characteristics of fine bubbles. Therefore, it is
an urgent task to solve this concern.
Currently there are several measurement methods widely used to evaluate the number concentration
index the size index of particles. However, there are few methods to distinguish bubbles in fine bubble
dispersion from other particles.
This issue can be resolved, using the phenomenon that the bubbles can be eliminated without any
residues after dissolution and flotation. If a method that eliminates fine bubbles in specific size range
is known, it is possible to distinguish fine bubbles from other solid and liquid particles. The eliminated
particles can be fine bubbles. If most of fine bubbles decreased, solution that doesn’t have them can be
used as blank solution which is used for measurements as background. Because it is expected that fine
bubbles elimination techniques will develop more, standardizing elimination techniques and evaluation
method is required.
This document is intended to specify the evaluation method for elimination efficiency of fine bubbles
from fine bubble dispersions in water.
Standardization for evaluating elimination efficiency of fine bubble enable easy and clear comparison
among the several elimination techniques and realizes the optimization of conditions for respective
elimination technique.
© ISO 2020 – All rights reserved v

---------------------- Page: 5 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 24261-1:2020(E)
Fine bubble technology — Elimination method for sample
characterization —
Part 1:
Evaluation procedure
1 Scope
This document specifies the evaluation procedure of fine bubble elimination for fine bubble dispersion
in water. This document is applicable to fine bubbles without shell and not applicable to fine bubbles
with shell.
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.
ISO 20480-1, Fine bubble technology — General principles for usage and measurement of fine bubbles —
Part 1: Terminology
ISO 20480-2, Fine bubble technology — General principles for usage and measurement of fine bubbles —
Part 2: Categorization of the attributes of fine bubbles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20480-1 and the following 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 https:// www .iso .org/ obp
3.1
elimination of fine bubbles (FB)
process for decrease of the concentration index of fine bubbles
3.2
fine bubble dispersion
FBD
liquid which contai
...