A pool aerator for pools with water recirculation circuit includes a hemispherical body and an atmospheric air intake pipe. The body of the aerator includes a rounded plastic object, having in the middle area a cylindrical portion, and at one end with a connecting means to the pool nozzle. The middle portion of the aerator body continues with a hemispherical dome. A Venturi tube made in the form of two intersected frustoconical spaces is positioned in the hemispherical dome. One of the intersected frustoconical spaces functions as an inlet and the other for mixing and discharging water mixed with air. The two axes of the intersected frustoconical spaces form an angle () between 10 and 20 degrees. The mixing hole communicates with a vertical cylindrical hole, in which the intake pipe is inserted by sliding, until the inner wall of the frustoconical hole is reached.

A pool aerator for pools with water recirculation circuit includes a hemispherical body and an atmospheric air intake pipe. The body of the aerator includes a rounded plastic object, having in the middle area a cylindrical portion, and at one end with a connecting means to the pool nozzle. The middle portion of the aerator body continues with a hemispherical dome. A Venturi tube made in the form of two intersected frustoconical spaces is positioned in the hemispherical dome. One of the intersected frustoconical spaces functions as an inlet and the other for mixing and discharging water mixed with air. The two axes of the intersected frustoconical spaces form an angle () between 10 and 20 degrees. The mixing hole communicates with a vertical cylindrical hole, in which the intake pipe is inserted by sliding, until the inner wall of the frustoconical hole is reached.

A microbubble spray head and a washing apparatus with the same. The microbubble spray head includes a spray pipe, where the spray pipe is of an integrated or two-part hollow pipe structure, an air inlet channel is provided in the spray pipe, the spray pipe is configured to enable water flow to generate negative pressure in the spray pipe, external air is sucked into the spray pipe via the air inlet channel by the negative pressure and is mixed with water flow in the spray pipe to form bubble water; and a bubbler, where the bubbler is fixed at the outlet end of the spray pipe and is configured to be capable of forming microbubble water when the bubble water flows through the bubbler. The microbubble spray head has good microbubble generation performance and low manufacturing costs.

A microbubble spray head and a washing apparatus with the same. The microbubble spray head includes a spray pipe, where the spray pipe is of an integrated or two-part hollow pipe structure, an air inlet channel is provided in the spray pipe, the spray pipe is configured to enable water flow to generate negative pressure in the spray pipe, external air is sucked into the spray pipe via the air inlet channel by the negative pressure and is mixed with water flow in the spray pipe to form bubble water; and a bubbler, where the bubbler is fixed at the outlet end of the spray pipe and is configured to be capable of forming microbubble water when the bubble water flows through the bubbler. The microbubble spray head has good microbubble generation performance and low manufacturing costs.

A bubble generator includes an ejector including a flow passage, a water supplier that supplies water into the flow passage, an air supplier that supplies air into the flow passage, a cleaner supplier that supplies a cleaner into the flow passage, and a bubble discharger that discharges bubbles generated by mixing the water, the air, and the cleaner; a water supply device that supplies water to the flow passage via the water supplier, and a cleaner supply device that supplies the cleaner to the flow passage via the cleaner supplier. The cleaner supplier is formed on a lower surface of the flow passage.

The invention relates to a method for catalytically producing formic acid and regenerating the catalyst used in the process. A vanadyl ion, vandate ion, or polyoxometallate ion, which is used as the catalyst, of the general formula [PMo.sub.xV.sub.yO.sub.40].sup.n is brought into contact with an alpha hydroxyl aldehyde, an alpha hydroxy carboxylic acid, a carbohydrate, a glycoside, or a polymer, which contains a carbon chain and which comprises at least one OH group that is bound to the carbon chain as a substituent in a repeating manner and/or an O, N, or S atom contained in the carbon chain in a repeating manner, in a liquid solution (12) in a vessel (10) at a temperature above 70 C. and below 160 C., wherein 6x11, 1y6, 3<n<10, and x+y=12, where n, x, and y is each a whole number. The catalyst reduced in the process is returned to its starting state by oxidation. For this purpose, the solution (12) is brought into contact with a gas (18) which contains a volume percent of oxygen of at least 18% at a pressure of at least 2 bar and maximally 16 bar by means of a mixing device or via a liquid-non-permeable gas-permeable membrane. CO and/or CO.sub.2 resulting during the reaction and merging with the gas (18) is discharged in such a quantity that the volume percent of CO and CO.sub.2 combined does not exceed 80% in the gas (18).

A method of generating bubbles of a first fluid in a second fluid, the method comprising: flowing a stream of the second fluid through a microfluidic channel; injecting a stream of the first fluid into the microfluidic channel through an aperture such that bubbles of the first fluid form in the second fluid; and sonicating the microfluidic channel with ultrasound so as to cause the bubbles formed at the aperture to divide.

A bubble generation device includes: a metallic narrow tube (10) through which water passes; and a pump that pressure-feeds the water containing a gas component into the metallic narrow tube (10). A drawer (11) in which a path through which the water passes is narrower than the front and the rear thereof in the flow direction of the water is disposed on the inside of the metallic narrow tube (10). The drawer (11) has the rectangular cross section orthogonal to the flow direction. The gas component contained in the water is dissolved in the water by pressure-feeding the water to the drawer (11), bubbles are evolved due to a decrease in pressure in the drawer (11), turbulent flow is generated in the water in the drawer (11) to crush bubbles in the water by the shearing force thereof, and bubbles are crushed by a shock wave caused by transonic flow occurring in the water that has exited from the drawer (11).

A method and apparatus for significantly extending the shelf life of an inert gas infused fluid. Air that has been subjected to a high electrical potential corona and then mixed with a fluid in a constant differential pressure venturi is delivered to an improved container apparatus wherein an inert gas is infused into the fluid such that the resultant stabilized fluid demonstrates significantly improved usable life. Alternatively, an additive may be combined to provide application specific characteristics. The combination of the method and apparatus, taken together, provide substantially increased shelf life of an inert gas infused fluid.

An ultrafine bubble water manufacturing device includes a whirlpool pump, an ejector, a cascade pump, a branch portion on the downstream side of the cascade pump, a return path which communicates from the branch portion between the ejector and the cascade pump, a flow rate adjusting valve and a first ultrafine bubble manufacturing unit interposed in the return path, an emission path which communicates with the branch portion, a second ultrafine bubble manufacturing unit interposed in the emission path and a control device. The control device controls an air amount adjusting valve, the whirlpool pump, the cascade pump and the flow rate adjusting valve based on the measurement values of a concentration meter for the emission path and first and second pressure gauges and on the downstream and upstream sides of the cascade pump.