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.

An aeration grid is provided. The aeration grid may comprise a curved body, a plurality of aeration extensions extending from the curved body, wherein each of the plurality of aeration extensions may comprise one or more aeration openings, and a plurality of nesting extrusions extending between the curved body and the plurality of aeration extensions.

A method and apparatus for producing chlorine gas whereby a nanobubble generator introduces nanobubbles at a concentration of at least 10.sup.6 nanobubbles per cm.sup.3 into an electrolytic cell comprising a pair of electrodes and a chlorine-containing, electrolyzable liquid, and the electrolytic cell is operated to produce chlorine gas.

A large-scale harmful algae bloom mitigation system that is environmentally safe, cost-effective, and scalable utilizing a hyperoxic nanobubble treatment and remote brevetoxin screening, without relying on heavy laboratory equipment. The hyperoxic nanobubble treatment and remote brevetoxin screening system is configured for installation within a narrow cross-section of an area of a body of water. The system is a stationary, high oxygen concentration, gas flow system that injects a large amount of oxygen enriched nanobubbles underwater at a small cross-section of a body of water, thereby controlling a large amount of water rapidly and in an environmentally-safe manner.

An aeration plate is provided, including an aeration top plate portion and a side baffle portion. The aeration top plate portion is scattered with a plurality of aeration holes, such that the aeration top plate portion and the side baffle portion cooperate to form an aeration member. A fruit and vegetable cleaning machine is provided, including a machine body. The machine body is provided with a cleaning tank with a top opening, and the cleaning tank is provided with the aeration plate at an inner bottom wall, such that an area enclosed by the aeration top plate portion, the side baffle portion, and the inner bottom wall forms a first dissolving zone for gas and water, and a second dissolving zone for bubbles and water is formed between a periphery of the aeration plate and the cleaning tank.

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.