Fine bubble technology — Water treatment applications — Part 1: Test method for evaluating ozone fine bubble water generating systems by the decolorization of methylene blue

This document specifies a test method to assess the performance of ozone fine bubble water generating systems used for decolorizing water-soluble dye in e.g. wastewater and industrial water. This document does not address the impact of ozone on health and environment.

Technologie des fines bulles — Traitement de l'eau — Partie 1: Méthode d'essai pour évaluer les diffuseurs à fines bulles d'ozone par la décoloration du bleu de méthylène

General Information

Status
Published
Publication Date
03-Dec-2020
Current Stage
6060 - International Standard published
Start Date
04-Dec-2020
Due Date
18-Jun-2022
Completion Date
04-Dec-2020
Ref Project

Relations

Buy Standard

Standard
ISO 20304-1:2020 - Fine bubble technology -- Water treatment applications
English language
13 pages
sale 15% off
Preview
sale 15% off
Preview
Draft
ISO/FDIS 20304-1:Version 13-okt-2020 - Fine bubble technology -- Water treatment applications
English language
13 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20304-1
First edition
2020-12
Fine bubble technology — Water
treatment applications —
Part 1:
Test method for evaluating ozone fine
bubble water generating systems by
the decolorization of methylene blue
Technologie des fines bulles — Traitement de l'eau —
Partie 1: Méthode d'essai pour évaluer les diffuseurs à fines bulles
d'ozone par la décoloration du bleu de méthylène
Reference number
ISO 20304-1:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 20304-1:2020(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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 20304-1:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Decolorization test by ozone fine bubble water .................................................................................................................. 2

4.1 Principle ........................................................................................................................................................................................................ 2

4.2 Test environment conditions ...................................................................................................................................................... 2

4.3 Configuration of test equipment .............................................................................................................................................. 2

4.4 Raw material gas supply unit (A unit) ................................................................................................................................ 3

4.5 Ozone generator supply unit (B unit) ................................................................................................................................. 3

4.6 Chemical reaction unit by ozone (C unit) ......................................................................................................................... 4

4.7 Discharged ozone treatment unit (D unit) ...................................................................................................................... 5

4.8 Calibration procedure ....................................................................................................................................................................... 5

4.9 Test procedure ......................................................................................................................................................................................... 5

5 Expression of test results of the decolorization effect .................................................................................................. 6

5.1 Evaluation object ................................................................................................................................................................................... 6

5.2 Functional processing ....................................................................................................................................................................... 6

5.3 Uncertainty evaluation ..................................................................................................................................................................... 7

6 Measurement of size and number concentration classification using air ................................................7

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

Annex A (informative) Examples of in-line measuring instruments ................................................................................... 9

Annex B (informative) Example of test results for ozone bubble and ozone fine bubble

water generating systems ........................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 20304-1:2020(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 20304 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 20304-1:2020(E)
Introduction

Ozone is used to improve water quality e.g. for purification and decomposition of hardly decomposable

substances and decolorization. The conventional method often uses diffuser tubes. However, it has

been found that with ozone fine bubbles, it is possible to use the strong oxidizing power of ozone more

efficiently.

In recent years, the establishment of fine bubble generating technology has made ozone utilization

efficiency higher than that of diffuser tube systems. Test results demonstrate that ozone fine bubble

water generating systems are about 1,6 times more efficient than diffuser tube systems. With this

efficiency increase, cost reduction has become possible.

Decolorization is mainly used for factory wastewater, regeneration and sewage water. It is also used

on a regular basis for sewage treatment facilities, as advanced treatment technology in the dye-house

effluent, etc.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 20304-1:2020(E)
Fine bubble technology — Water treatment applications —
Part 1:
Test method for evaluating ozone fine bubble water
generating systems by the decolorization of methylene blue

WARNING — Persons using this document should be familiar with normal laboratory practice.

This document does not purport to address all of the safety problems, if any, associated with its

use. It is the responsibility of the user to establish appropriate safety and health practices and to

determine the applicability of any other restrictions.
1 Scope

This document specifies a test method to assess the performance of ozone fine bubble water generating

systems used for decolorizing water-soluble dye in e.g. wastewater and industrial water. This document

does not address the impact of ozone on health and environment.
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 10678, Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of

photocatalytic activity of surfaces in an aqueous medium by degradation of methylene blue

ISO 20480-1, Fine bubble technology — General principles for usage and measurement of fine bubbles —

Part 1: Terminology

ISO 20480-2:2018, 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:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
fine bubble water
water containing air fine bubbles
3.2
ozone fine bubble water
water containing ozone fine bubbles
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 20304-1:2020(E)
3.3
absorbance

natural logarithm of the ratio of the light amount before and after transmission of the test water-soluble

dye with the photometric amount defined in ISO 80000-7:2019, 7-32.1
3.4
half-life of absorbance

time required for the change in absorbance to reach 50 % of the initial concentration

4 Decolorization test by ozone fine bubble water
4.1 Principle

A measured quantity of ozone is sent to a water-soluble dye tank through a fine bubble water generating

system. The absorbance in the tank is optically measured to determine the half-life of absorbance.

Absorbance is measured using e.g. a colorimeter, spectrophotometer or absorbance meter. It is desirable

to use an inline type absorbance measuring instrument. Examples of inline measuring instruments are

shown in Annex A.
4.2 Test environment conditions

The temperature of the test room should be 23 °C ± 3 °C and the relative humidity should be 50 % ± 10 %.

In addition, it should be taken care not to mix fine particles in the test environment.

4.3 Configuration of test equipment

The testing apparatus comprises a raw material gas supply unit, an ozone generator supply unit, a

chemical reaction unit by ozone, and a discharged ozone treatment unit. The configuration of the test

equipment is shown in Figure 1. The ozone reaction unit is indicated by a double line in Figure 1.

2 © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 20304-1:2020(E)
Key
1 fine bubble water generating system
2 fine bubble water with dissolved methylene blue
3 test tank
4 circulating pump
5 measurement instrument unit
6 valve
7 untreated O
A raw material gas supply unit
B ozone generator supply unit
C chemical reaction unit by ozone
D discharged ozone treatment unit
Figure 1 — Configuration of test equipment
4.4 Raw material gas supply unit (A unit)

The raw material gas supply unit (A unit) is shown in Figure 1. Figure 1 shows a material gas supply unit

when using an oxygen cylinder or an oxygen gas generator. The oxygen concentration of the material

gas supply should be 90 % or more.
4.5 Ozone generator supply unit (B unit)

The conditions for supply of ozone to the ozone reaction unit shall be as follows:

a) The ozone flow rate shall be 0,5 l/min, the ozone yield shall be 3 g/h, it is important that the gas

gauge pressure is set and maintained at a certain level of pressure. In addition, the numerical value

of the gas gauge pressure shall be given in the test report, see Clause 7.

NOTE The conversion between ozone mass concentration and volume fraction is standardized by

ISO 13964:1998, 7.2. The results are reported as micrograms per cubic meter at the chosen reference

conditions, or as volume fraction. For ozone, a volume fraction of 1,0 × 10 at 0 °C, 101,3 kPa (standard

3 3
condition) is equivalent to 2 141 μg/m and 1 995 μg/m at 20 °C, 101, 3 kPa.
b) The ozone generator supply unit (B unit) is shown in Figure 1.
© ISO 2020 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 20304-1:2020(E)
4.6 Chemical reaction unit by ozone (C unit)

This C unit is composed of a fine bubble water generating system, a test tank, a measuring instrument

and a circulating pump. The installation of fine bubble water generating system shall be structured so

that the reference water-soluble dye in t
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20304-1
ISO/TC 281
Fine bubble technology — Water
Secretariat: JISC
treatment applications —
Voting begins on:
2020-09-10
Part 1:
Voting terminates on:
Test method for evaluating ozone fine
2020-11-05
bubble water generating systems by
the decolorization of methylene blue
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20304-1:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 20304-1:2020(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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 20304-1:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Decolorization test by ozone fine bubble water .................................................................................................................. 2

4.1 Principle ........................................................................................................................................................................................................ 2

4.2 Test environment conditions ...................................................................................................................................................... 2

4.3 Configuration of test equipment .............................................................................................................................................. 2

4.4 Raw material gas supply unit (A unit) ................................................................................................................................ 3

4.5 Ozone generator supply unit (B unit) ................................................................................................................................. 3

4.6 Chemical reaction unit by ozone (C unit) ......................................................................................................................... 4

4.7 Discharged ozone treatment unit (D unit) ...................................................................................................................... 5

4.8 Calibration procedure ....................................................................................................................................................................... 5

4.9 Test procedure ......................................................................................................................................................................................... 5

5 Expression of test results of the decolorization effect .................................................................................................. 6

5.1 Evaluation object ................................................................................................................................................................................... 6

5.2 Functional processing ....................................................................................................................................................................... 6

5.3 Uncertainty evaluation ..................................................................................................................................................................... 7

6 Measurement of size and number concentration classification using air ................................................7

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

Annex A (informative) Examples of in-line measuring instruments ................................................................................... 9

Annex B (informative) Example of test results for ozone bubble and ozone fine bubble

water generating systems ........................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 20304-1:2020(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 20304 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/FDIS 20304-1:2020(E)
Introduction

Ozone is used to improve water quality e.g. for purification and decomposition of hardly decomposable

substances and decolorization. The conventional method often uses diffuser tubes. However, it has

been found that with ozone fine bubbles, it is possible to use the strong oxidizing power of ozone more

efficiently.

In recent years, the establishment of fine bubble generating technology has made ozone utilization

efficiency higher than that of diffuser tube systems. Test results demonstrate that ozone fine bubble

water generating systems are about 1,6 times more efficient than diffuser tube systems. With this

efficiency increase, cost reduction has become possible.

Decolorization is mainly used for factory wastewater, regeneration and sewage water. It is also used

on a regular basis for sewage treatment facilities, as advanced treatment technology in the dye-house

effluent, etc.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20304-1:2020(E)
Fine bubble technology — Water treatment applications —
Part 1:
Test method for evaluating ozone fine bubble water
generating systems by the decolorization of methylene blue

WARNING — Persons using this document should be familiar with normal laboratory practice.

This document does not purport to address all of the safety problems, if any, associated with its

use. It is the responsibility of the user to establish appropriate safety and health practices and to

determine the applicability of any other restrictions.
1 Scope

This document specifies a test method to assess the performance of ozone fine bubble water generating

systems used for decolorizing water-soluble dye in e.g. wastewater and industrial water. This document

does not address the impact of ozone on health and environment.
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 10678, Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of

photocatalytic activity of surfaces in an aqueous medium by degradation of methylene blue

ISO 20480-1, Fine bubble technology — General principles for usage and measurement of fine bubbles —

Part 1: Terminology

ISO 20480-2:2018, 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:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
fine bubble water
water containing air fine bubbles
3.2
ozone fine bubble water
water containing ozone fine bubbles
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 20304-1:2020(E)
3.3
absorbance

natural logarithm of the ratio of the light amount before and after transmission of the test water-soluble

dye with the photometric amount defined in ISO 80000-7:2019, 7-32.1
3.4
half-life of absorbance

time required for the change in absorbance to reach 50 % of the initial concentration

4 Decolorization test by ozone fine bubble water
4.1 Principle

A measured quantity of ozone is sent to a water-soluble dye tank through a fine bubble water generating

system. The absorbance in the tank is optically measured to determine the half-life of absorbance.

Absorbance is measured using e.g. a colorimeter, spectrophotometer or absorbance meter. It is desirable

to use an inline type absorbance measuring instrument. Examples of inline measuring instruments are

shown in Annex A.
4.2 Test environment conditions

The temperature of the test room should be 23 °C ± 3 °C and the relative humidity should be 50 % ± 10 %.

In addition, it should be taken care not to mix fine particles in the test environment.

4.3 Configuration of test equipment

The testing apparatus comprises a raw material gas supply unit, an ozone generator supply unit, a

chemical reaction unit by ozone, and a discharged ozone treatment unit. The configuration of the test

equipment is shown in Figure 1. The ozone reaction unit is indicated by a double line in Figure 1.

2 © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/FDIS 20304-1:2020(E)
Key
1 fine bubble water generating system
2 fine bubble water with dissolved methylene blue
3 test tank
4 circulating pump
5 measurement instrument unit
6 valve
7 untreated O
A raw material gas supply unit
B ozone generator supply unit
C chemical reaction unit by ozone
D discharged ozone treatment unit
Figure 1 — Configuration of test equipment
4.4 Raw material gas supply unit (A unit)

The raw material gas supply unit (A unit) is shown in Figure 1. Figure 1 shows a material gas supply unit

when using an oxygen cylinder or an oxygen gas generator. The oxygen concentration of the material

gas supply should be 90 % or more.
4.5 Ozone generator supply unit (B unit)

The conditions for supply of ozone to the ozone reaction unit shall be as follows:

a) The ozone flow rate shall be 0,5 l/min, the ozone yield shall be 3 g/h, it is important that the gas

gauge pressure is set and maintained at a certain level of pressure. In addition, the numerical value

of the gas gauge pressure shall be given in the test report, see Clause 7.

NOTE The conversion between ozone mass concentration and volume fraction is standardized by

ISO 13964:1998, 7.2. The results are reported as micrograms per cubic meter at the chosen reference

conditions, or as volume fraction. For ozone, a volume fraction of 1,0 × 10 at 0 °C, 101,3 kPa (standard

3 3
condition) is equivalent to 2 141 μg/m and 1 995 μg/m at 20 °C, 101, 3 kPa.
b) The ozone generator supply unit (B unit) is shown in Figure 1.
© ISO 2020 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO/FDIS 20304-1:2020(E)
4.6 Chemical reaction unit by ozone (C unit)
This C unit is composed of a fine bubble
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.