ISO/TC 281/WG 3 - Applications of fine bubble technology

This document specifies a method for assessing the impact of ultrafine bubbles (UFBs) on membrane antifouling using the crossflow filtration system as the evaluation setup. The evaluation compares the membrane fouling behaviour of the original wastewater (control) with that of the same wastewater after UFB generation under specified operating conditions. This document is applicable to dispersions containing UFBs, including dispersions in which microbubbles (MBs) are present in combination with UFBs. The method employs the crossflow membrane fouling index (CMFI), measured under constant transmembrane pressure during crossflow filtration as the evaluation criterion. This method is applicable to various membrane treatment systems including ultrafiltration, nanofiltration, and reverse osmosis and can be used for different types of wastewater containing particulates, colloids, and soluble organic matter. This method is primarily intended for dispersions containing UFBs (see Annexes A to C and E); however, it is equally applicable, by analogy, to dispersions containing MBs (see Annex D). This document can guide the design and optimization of industrial processes that integrate FB technologies for enhanced membrane antifouling. NOTE 1 This method is intended for waters that contain a measurable amount of either particulate matter or colloidal matter, or both. It is not applicable to essentially particle-free waters, such as permeate from reverse osmosis or ultrafiltration systems. NOTE 2 Users can record supplementary information, e.g., turbidity, total suspended solids, and particle-size distribution; however, such data are not required in this document.

This document specifies a method to test the promotion of the germination of barley seeds, using ultrafine bubble (UFB) water produced from an ultrafine bubble water generating system. The performance of the method is assessed by measuring the ratio of barley seed germination.

This document specifies a test method for evaluating the effect of fine bubble water on the growth promotion of hydroponically grown lettuce by estimating the incremental gain in mass of the stems and leaves over a specified growth period.

This document specifies a test method to evaluate the oil removal performance from polyester-based textile with fine bubbles.

This document specifies the bubble volume concentration and bubble bed depth measurement methods by online particle counter for checking DAF process performance in plant. The test method of bubble volume concentration is made by measuring bubble size distribution in contact zone of DAF tank and calculating using formula. And bubble bed depth is evaluated by measuring the number of bubbles and particles according to the depth at five points in separation zone of DAF tank. This document provides the advantages and limitations of using online particle counter in plant.

This document demonstrates guidelines for promoting the germination of barley seeds with a lower number concentration of ultrafine bubbles (UFB). This is achieved by taking the data concerning the germination ratio of barley seeds conforming to ISO 23016-2 as a starting point and then evaluating the minimum number concentration range of ultrafine bubble water necessary for promoting the effect on germination of barely seeds by changing germination time.

This document specifies a test method for the cleaning of hard flooring surfaces. It can be used to demonstrate the comparative cleaning performance of a fine bubble solution to an alternate cleaning solution to remove contaminant from a soiled surface. This alternate cleaning solution can be another fine bubble solution, municipal tap water or a commercially available cleaning solution blended to the manufacturer’s specifications. This method is not suitable for differentiating between cleaning solutions when the contaminant is excessively applied on the surface as the mechanism of cleaning changes.

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.

This document describes the test method to evaluate the cleaning performance of ultrafine bubble water when used in high-pressure water jet to wash out salt-stained steel surfaces. The evaluation is carried out by measuring comparative removal of salt stain from the surface of a test plate with the ultrafine bubble water to that with control water.

This document specifies a test method for removal of machine oil stain from a noncorrosive metal surface using fine bubble water. A test is provided to show the comparative cleaning advantage of adding fine bubbles to the water.

This document specifies a method to test the promotion of the germination of barley seeds, using ultrafine bubble (UFB) water produced from an ultrafine bubble water generating system. The performance of the method is assessed by measuring the ratio of barley seed germination.

This document specifies a test method for evaluating the effect of fine bubble water on the growth promotion of hydroponically grown lettuce by estimating the incremental gain in mass of the stems and leaves over a specified growth period.