ISO 7429-1:2024 ファインバブル技術 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 281, Fine bubble technology.

A list of all parts in the ISO 7429 series can be found on the ISO website.

Introduction

Fine bubble (FB) technology has been used in a wide range of fields, including cleaning, water treatment, agro- and aqua-culture, liquid crystal, semiconductor and solar cell manufacturing, new functional material manufacturing, chemistry, cosmetics, medicine and pharmaceuticals, and food and drinking water. The market has been expanding from B to B market to B to C market, and the market has started up rapidly and is in the process of further growth.

In particular, nozzles as consumer devices are growing rapidly in the consumer market as FB generation technology has improved. Nozzles are devices that are divided into various types, such as insertion type, submerged type, and open type, and each type has its own characteristics. The insertion type, in which the nozzle is installed in the middle of the pipe and FB is mixed into the water used, is the most widely available in the market and is widely used in industrial applications such as cleaning, water treatment, agriculture and aquaculture, as well as for home use. The submerged type is installed in a water tank to generate FB in the cleaning tank, and is widely used for hot water nozzles in baths and water supply in tanks in fisheries and agriculture. The open type, which functions by passing through the air and coming into contact with the object (FB generation), is used for hand washing and kitchen faucets. Nozzles have a wide variety of applications and are one of the most widespread key devices for fine bubble generation in various industrial and household applications.

However, in some cases, the characteristics of FBs cannot be fully confirmed, and the devices are not functioning as well as they should. Therefore, in order for microbubble technology to maintain its reliability as a technology used in industrial and consumer applications around the world, there is a need for a method to evaluate the effectiveness and efficiency of the generating system, and standardization of the nozzle evaluation is needed. The most important characteristic is the number concentration and size index of the generated fine bubbles.

Thus, devices that are versatile in terms of application, small, portable anywhere in the world, and affordable are also important as they can contribute to the sustainable development goals (SDGs).

This document provides a method for evaluating the size and concentration index of microbubbles generated by nozzles, which will serve as a basis for fair and appropriate trade of FB nozzle devices leading to widespread use of the products. The users of this document are, directly, nozzle manufacturers, manufacturers of FB generators and systems, manufacturers and builders of FB application systems and facilities, and nozzle evaluation companies. Users of industrial cleaning equipment and water utilities can also use this document.

1 Scope

This document specifies the evaluation methods for size and concentration indices of fine bubbles (FBs) generated through a nozzle. It only applies to FB dispersions (FBDs) in water generated through the nozzle. It describes the sampling method for a FBD from the nozzle into the retention container and the measurements of size and concentration indices.

Major applications of the equipment include components of various industrial water systems and consumer baths and kitchens.

2 Normative references

The following documents are referred to in the text so that some or all of their content constitutes requirements of this document. For undated references, the latest edition of the referenced document (including any amendments) applies.

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 terminology databases for use in standardization at the following addresses:

Bibliography