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 all-ceramic diffuser supplies microbubbles of a narrow range of size to create a steady flow of bubbles of generally uniform size in an aqueous medium, such as process water in a wastewater treatment plant. The diffuser is formed of a porous body core, with pore sizes of e.g. 30 .Math.m or larger, an upper ceramic membrane that covers the upper surface of the body core, and has mean pore size of e.g., 3 to 15 .Math.m. A lower ceramic membrane covers the bottom surface of the body core, and has a finer pore size than the upper ceramic membrane, so that the capillary pore size of the smaller pores will act as a seal; consequently all of the air flow is through the upper ceramic membrane. A ceramic fitting connects the associated air supply with the porous body core which serves as plenum.

Systems, devices, and methods for manufacturing nanobubbles are disclosed herein. In an embodiment, a nanobubble generator system includes a medium, wherein in the medium is a liquid medium or a semi-liquid medium. A device is immersed in the medium. The device includes a ceramic membrane having a first surface and an opposing second surface, and pores extending through the membrane from the first surface to the second surface, and a hydrophobic porous coating layer disposed on the first surface of the membrane. The system includes a gas source for providing a gas to the medium. In operation, the gas enters pores on the second surface of the membrane and exits the coating layer in the form of nanobubbles.

A gas dissolution accelerating device with a simple structure efficiently increases the concentrations of oxygen dissolved in deep water, such as at lake bottoms. A gas dissolution accelerating device includes a cylindrical member located parallel to a vertical direction when installed, a box member having an opening facing downward when installed, and a fixing unit for fixing the box member to a diffuser. The box member includes a top plate having a cone-shaped protrusion protruding inward and a through-hole receiving the cylindrical member. The fixing unit includes a flat attachment plate having an upper surface onto which the box member is mounted, a pair of halved banding members for clamping a feeding pipe of the diffuser, and rod-shaped connecting members connecting the attachment plate to the banding members.

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.

An aerator includes an air supply chamber into which air is supplied by an air supply pump, a water flow channel connected to a water feed pipe, and a gas-permeable porous body having multiple gas discharge pores and separating the air supply chamber and the water flow channel. Air in the air supply chamber is pushed into water in the water flow channel through the gas discharge pores of the porous body due to discharge pressure of the air supply pump. In the porous body, inner surfaces of the gas discharge pores are coated with a coating film made of a water repellent having such a wettability that a water droplet contact angle is 80 degrees or more and preferably 90 degrees or more, on a smooth flat film surface.

A gas dissolution accelerating device with a simple structure efficiently increases the concentrations of oxygen dissolved in deep water, such as at lake bottoms. A gas dissolution accelerating device includes a cylindrical member located parallel to a vertical direction when installed, a box member having an opening facing downward when installed, and a fixing unit for fixing the box member to a diffuser. The box member includes a top plate having a cone-shaped protrusion protruding inward and a through-hole receiving the cylindrical member. The fixing unit includes a flat attachment plate having an upper surface onto which the box member is mounted, a pair of halved banding members for clamping a feeding pipe of the diffuser, and rod-shaped connecting members connecting the attachment plate to the banding members.

A micro bubble generation method and generation device. The micro bubble generation method includes: passing a gas through a microporous material, the gas forming micro bubbles at an interface between the microporous material and liquid, the bubbles being adsorbed on the surface of the microporous material; impacting the micro bubbles adsorbed on the microporous material by relative motion of the microporous material and the liquid, such that the micro bubbles detach from the microporous material and enter into the liquid. The micro bubble generation device includes a gas accommodating chamber (1) disposed below the liquid surface, and a gas transmission pipeline (3). A microporous material layer (2) is arranged around the periphery of the gas accommodating chamber (1). The gas in the gas accommodating chamber (1) passes through the microporous material layer (2) by gas pressure to form micro bubbles on the outer surface thereof. The microporous material layer (2) moves and/or the liquid outside the microporous material layer (2) moves to cut the micro bubbles.

Systems, devices, and methods for manufacturing nanobubbles are disclosed herein. In an embodiment, a nanobubble generator system includes a medium, wherein in the medium is a liquid medium or a semi-liquid medium. A device is immersed in the medium. The device includes a ceramic membrane having a first surface and an opposing second surface, and pores extending through the membrane from the first surface to the second surface, and a hydrophobic porous coating layer disposed on the first surface of the membrane. The system includes a gas source for providing a gas to the medium. In operation, the gas enters pores on the second surface of the membrane and exits the coating layer in the form of nanobubbles.

A wine aerating device for adding oxygen containing gas into wine, the device comprising a gas cylinder containing pressurised gas which contains more than 21% oxygen by volume when measured at atmospheric conditions, a tube with a first end in fluid communication with the gas cylinder to a membrane which is in fluid communication with a second end of the tube, wherein the membrane is insertable through the neck of a wine bottle so that, in use, oxygen gas diffuses via the membrane into the wine, wherein the said membrane has a pore size of 0.1 m to 10 m, preferably 1 m to 10 m.