ISO 20480-3:2021

Overview

ISO 20480-3:2021 - Fine bubble technology: Methods for generating fine bubbles describes and categorizes practical methods for producing fine bubbles (microbubbles and ultrafine bubbles). Part 3 of the ISO 20480 series focuses on generation principles and provides illustrated examples and terminology references to support consistent communication, design and selection of fine-bubble generating systems.

Key topics

• Scope and structure: Describes methods for generating fine bubbles and cross‑references ISO 20480-1 (terminology) and ISO 20480-2 (attribute categorization).
• Terms and definitions: Aligns generation methods with standardized terms (e.g., cavitation, Venturi tube, micropore, ultrasound, electrolysis).
• Examples of generation methods: Detailed descriptions and schematic examples for many techniques including:
  • Swirling flow systems (microbubble and ultrafine variants)
  • Static mixer systems
  • Ejector and Venturi systems
  • Pressurized dissolution systems
  • Mechanical shear systems
  • Micropore and surfactant‑assisted micropore systems
  • Microporous shear, heat separation, mixed vapor condensation
  • Electrolytic and ultrasound (cavitation) systems
  • Other methods and Annex A with additional examples
• Illustrative schematics: Each method is supported by explanatory figures showing key components (nozzles, throats, micropores, pumps, saturators, etc.).
• Normative linkage: Ensures consistent use of terminology and attribute categorization across the ISO 20480 series.

Practical applications

ISO 20480-3 is useful when selecting, evaluating or specifying fine-bubble generation equipment and processes. Typical application areas include:

• Water and wastewater treatment
• Aquaculture and fisheries
• Industrial process intensification (aeration, flotation)
• Surface cleaning, oxidation and mass‑transfer operations
• R&D and pilot testing of fine‑bubble technologies

The standard helps purchasers, designers and system integrators compare generation principles (e.g., Venturi vs. micropore vs. pressurized dissolution) and understand operational trade-offs such as pumping and saturation approaches.

Who should use this standard

• Equipment manufacturers and system designers developing fine bubble generators
• Process and environmental engineers specifying aeration or flotation equipment
• R&D teams evaluating generation principles and scale‑up options
• Procurement and standards professionals who need consistent terminology and performance categorization

Related standards

• ISO 20480-1 - Terminology for fine bubble technology
• ISO 20480-2 - Categorization of attributes of fine bubbles

Keywords: ISO 20480-3, fine bubble technology, methods for generating fine bubbles, microbubble generation, ultrafine bubble, Venturi, ejector, micropore, pressurized dissolution, ultrasound cavitation.