An elongate diffuser is disclosed comprising a diffuser body and a membrane attached to the diffuser body. The membrane is connected to the diffuser body so that introduction of gas at a working pressure into the diffuser displaces part of the membrane from contact with the diffuser body to provide an elongate sealed compartment between the membrane and a surface of the diffuser body. The compartment has a first lateral side interface region where the membrane contacts the diffuser body, a laterally intermediate region where the membrane is spaced apart from the diffuser body and a second lateral side interface region where the membrane contacts the diffuser body. The diffuser body surface which bounds the compartment comprises a recessed portion which is recessed away from the membrane between the first second lateral side interface regions.

Provided is an ultra-fine bubble-containing liquid manufacturing apparatus that can suppress viable cell contamination inside a UFB generating unit. To this end, it is provided with an ultra-fine bubble generating unit that generates an ultra-fine bubble by making film boiling by a heating unit in a liquid in which a gas is dissolved, and a radiating unit that is capable of irradiating a wetted portion of the ultra-fine bubble generating unit with ultraviolet rays.

Provided is an ultra-fine bubble-containing liquid manufacturing apparatus that can suppress viable cell contamination inside a UFB generating unit. To this end, it is provided with an ultra-fine bubble generating unit that generates an ultra-fine bubble by making film boiling by a heating unit in a liquid in which a gas is dissolved, and a radiating unit that is capable of irradiating a wetted portion of the ultra-fine bubble generating unit with ultraviolet rays.

Provided is a bubble sterilizing cleaner capable of automatically sterilizing and objects to be cleaned to be cleaned, such as fruits and vegetables. The bubble sterilizing cleaner includes a bubble supply unit for spraying microbubbles into a cleaning tank and an aeration unit for discharging water or air to the cleaning tank to improve sterilizing and cleaning efficiency and reduce cleaning time, and includes a fluid supply means connected with a water inlet of the cleaning tank and the aeration unit to supply a fluid so that the water supply rate is adjustable in accordance with a condition of an installation location thereof.

A gas solution manufacturing device 1 includes a gas supply line 2 configured to supply a gas as a raw material of a gas solution, a liquid supply line 3 configured to supply a liquid as a raw material of the gas solution, a gas solution production unit 4 configured to mix the gas and the liquid together to produce the gas solution, a gas-liquid separation unit 5 configured to perform gas-liquid separation of the produced gas solution into a supplied liquid to be supplied to a use point and a discharged gas to be discharged through an exhaust port, and a gas dissolving unit 6 provided in the liquid supply line 4 and configured to dissolve the discharged gas resulting from the gas-liquid separation in the liquid. The gas dissolving unit 6 is configured with a hollow fiber membrane configured with a gas permeable membrane.

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.

There is provided an ammonia gas removal system, including a fine bubble generation device which is configured to receive at least a portion of scrubber process water from a storage tank, and to generate fine bubbles containing carbon dioxide gas in the received scrubber process water, the storage tank being configured to store the scrubber process water to be provided to a gas scrubber, the gas scrubber being configured to spray the process water onto ammonia-containing gas.

There is provided an ammonia gas removal system, including a fine bubble generation device which is configured to receive at least a portion of scrubber process water from a storage tank, and to generate fine bubbles containing carbon dioxide gas in the received scrubber process water, the storage tank being configured to store the scrubber process water to be provided to a gas scrubber, the gas scrubber being configured to spray the process water onto ammonia-containing gas.

A floating aerator that is highly efficient in oxygenating water and wastewater utilizes high-volume, low pressure air that is diffused into a sub-surface oxygen transfer chamber in which water and wastewater is oxygenated. An air lift is created in the oxygen transfer chamber through the discharge of air bubbles in the water column in the aerator. The aerator comprises a floating head having a concave lower surface, a main chamber or barrel that defines the oxygen transfer chamber, and an air diffuser that extends coaxially through the float head and barrel interconnects the float head to the barrel such that there is a discharge slot defined between the lower surface of the float head and the barrel. A ballast ring floats the aerator at the desire level such that a flow of air bubbles and oxygenated water or wastewater are discharged at a subsurface level.

This application relates to a method of treating wastewater wherein an oxygen infusion system is used to supersaturate wastewater before aerobic biological processes, wherein oxygen is transferred to the wastewater free of oxygen bubbles and achieves a reduction in power demand for the aeration process of wastewater.