Provided is a fine bubble supply device and a fine bubble analyzing system capable of more stably supplying fine bubbles unstable in a liquid. A fine bubble generating device generates fine bubbles. A retention vessel stores a liquid therein, and an inlet pipe and an outlet pipe of the fine bubbles are connected to the retention vessel. The fine bubbles generated from the fine bubble generating device are introduced into the liquid in the retention vessel through the inlet pipe to be retained in the liquid. The fine bubbles retained in the liquid are led out to a supply destination (fine bubble characteristic evaluation device) through the outlet pipe.

A mixing aerator is disclosed that includes a housing defining a chamber having a bottom end and a top end, the housing having at least one inlet and at least one outlet; and a longitudinally extending diffuser disposed within the chamber and configured to deliver air bubbles into the chamber when the chamber is filled with liquid. The diffuser includes (a) a tubular elastomeric membrane having a plurality of perforations and, within the tubular elastomeric membrane, (b) an air pipe having a plurality of openings, the openings being larger and fewer than the perforations, and the tubular membrane having upper and lower ends that are sealed against an outer surface of the air pipe.

A floating power generation unit is provided which, by dispersing oxygen content in water as fine air bubbles while generating power on the water, increases the activity of aerobic organisms, promotes plankton growth, and improves fishing grounds. This floating power generation unit is provided with a power generator, an oxygen separator, and a float. The power generator and the oxygen separator are arranged on the top surface of the float. The floating power generation unit is provided with a first fine air bubble generating medium which supplies the oxygen separated by the oxygen separator into the water as fine air bubbles and is provided with a second fine air bubble generating medium which supplies the nitrogen separated by the oxygen separator into the water as fine air bubbles.

This application relates to a system and method of treating a liquid wherein an oxygen infusion system is used to supersaturate the liquid, wherein oxygen is transferred to the liquid free of oxygen bubbles. The oxygen infusion system can include an eductor without any moving parts, the eductor configured to pump the liquid through a plurality of gas infusion modules, driving liquid flow from a bottom portion of a gas infusion tank towards a top portion of the gas infusion tank thereby causing at least some of the liquid to flow from a bottom end of the plurality of gas infusion modules to a top end of the plurality of gas infusion modules.