A micro-bubble generating system according to an embodiment of the present invention may include an electrolytic bath configured to generate primary micro-bubbles; a water supply hose which is connected to an outlet end of the electrolytic bath; and a micro-bubble generating device which is connected to the outlet end of the water supply hose to generate secondary micro-bubbles having a smaller diameter than the primary micro-bubbles.

To realize excellent durability of an apparatus, realize a dissolved gas amount suitable for propagation of ultrasonic waves, and stably generate fine bubbles that further comply with a treatment using ultrasonic waves. An ultrasonic treatment apparatus according to the present invention includes: a treatment part capable of accommodating a treatment liquid and an object to be treated; an ultrasonic generator that is provided in the treatment part and applies ultrasonic waves to the object to be treated; and a circulation path for circulating the treatment liquid in the treatment part, in which a fine bubble generator which performs deaeration on an extracted treatment liquid and generates fine bubbles in the treatment liquid, is provided to the circulation path, in series with a treatment liquid extraction pipe. The fine bubble generator has two or more narrow portions each having an opening flow path with a size narrower than an inside diameter of the treatment liquid extraction pipe, in which the opening flow paths of the narrow portions adjacent to each other are configured to prevent the treatment liquid from proceeding straight, and an opening cross-sectional area at each pressure reduction zone satisfies a predetermined relation.

To realize excellent durability of an apparatus, realize a dissolved gas amount suitable for propagation of ultrasonic waves, and stably generate fine bubbles that further comply with a treatment using ultrasonic waves. An ultrasonic treatment apparatus according to the present invention includes: a treatment part capable of accommodating a treatment liquid and an object to be treated; an ultrasonic generator that is provided in the treatment part and applies ultrasonic waves to the object to be treated; and a circulation path for circulating the treatment liquid in the treatment part, in which a fine bubble generator which performs deaeration on an extracted treatment liquid and generates fine bubbles in the treatment liquid, is provided to the circulation path, in series with a treatment liquid extraction pipe. The fine bubble generator has two or more narrow portions each having an opening flow path with a size narrower than an inside diameter of the treatment liquid extraction pipe, in which the opening flow paths of the narrow portions adjacent to each other are configured to prevent the treatment liquid from proceeding straight, and an opening cross-sectional area at each pressure reduction zone satisfies a predetermined relation.

A minute bubble generator includes a flow path member including a flow path allowing a liquid to pass therethrough; and a colliding part provided in the flow path and generating minute bubbles in the liquid passing through the flow path by locally reducing a cross sectional area of the flow path. The colliding part is formed integrally with the flow path member and is provided closer to an upstream end or a downstream end relative to a lengthwise center of the flow path.

The present invention provides a fine bubble generating apparatus capable of generating fine bubbles efficiently. The present invention includes a fluid flow passage that includes a narrow portion in at least a part thereof, a heating part capable of heating a liquid flowing through the fluid flow passage, and a controlling unit that controls the heating part. The controlling unit controls the heating part to generate film boiling in the liquid to generate ultrafine bubbles.

An apparatus for producing nano-bubbles in a volume of liquid is described. The apparatus includes a motor having a rotatable shaft, an axially rotatable permeable member couplable to a gas inlet, and a rotatable tube support coupled to the rotatable shaft of the motor and having an inner cavity that houses the axially rotatable permeable member. When rotated, the axially rotatable permeable member is rotated so that the surface velocity of the rotatable permeable member simulates axial turbulent flow above the turbulent threshold in the liquid that allows the liquid to shear gas from the outer surface of the axially rotatable permeable member, thereby forming nano-bubbles in the liquid.

A system for producing a liquid with gas bubbles. The system has an eductor to mix a liquid stream and a gas stream to a form of a liquid-gas mixture and a mixing column with a stack of filling layers to reduce a size of gas bubbles within the liquid-gas mixture. The stack of filling layers has a plurality of porous layers separated alternately by plate layers and ring layers.

Systems, devices, and methods are presented for optimizing the formation of gas nanobubbles in a disinfecting solution. In an example system for treating contaminated water, a centrifugal pump draws the water from a reservoir and circulates the water in and through a circuit of elements including a mixing chamber in the pump, a pressure vessel, a backflow valve, a Venturi injector, and a pair of nozzles immersed in the reservoir. The system injects ozone-rich gas into the fluid to produce an aqueous solution containing a volume of gas nanobubbles. The nozzles release the gas nanobubbles into the reservoir, creating highly reactive compounds that destroy organic compounds and other contaminants in the water.

An apparatus for manufacturing water having a high concentration of dissolved ozone is characterized by being configured by connecting: a filtering device; a water tank connected to the filtering device; a pump connected to the water tank; a Venturi tube connected to the pump; a first gas dissolving pressure device connected to the Venturi tube; and a second gas dissolving pressure device connected to the first gas dissolving pressure device.

The apparatus includes: a producing unit that generates ultrafine bubbles in a liquid supplied from a liquid introducing unit to produce an ultrafine bubble-containing liquid containing the ultrafine bubbles, and delivers the ultrafine bubble-containing liquid; a liquid delivering unit that delivers the ultrafine bubble-containing liquid to an outside; a buffer tank that receives the liquid delivered from the producing unit and delivers the liquid to the liquid delivering unit; and a controller that controls the delivery of the ultrafine bubble-containing liquid from the buffer tank to the liquid delivering unit such that, if the producing unit stops operating, an ultrafine bubble-containing liquid accumulated in the buffer tank is delivered to the liquid delivering unit to enable the liquid delivering unit to deliver the ultrafine bubble-containing liquid to the outside.