A device for generating gas bubbles in a liquid in a container includes a rotatable gas-permeable hollow shaft arranged in a container, gassing discs arranged on the hollow shaft and spacers arranged between the gassing discs, gassing discs and spacers being arranged alternately on the hollow shaft in gas-tight contact with one another, a feed line for a compressed gas into the interior of the shaft, having a centered opening (O) for receiving said shaft and at least two chambers, said chambers being equally spaced around said centered opening, where said centered opening and said chambers at least partially overlap, where the centered opening and the chambers are in communication with one another at least in the overlap region, so that the compressed gas can flow from shaft into in each case a chamber of the spacer and enter the gassing discs from the chamber of the spacer.

The invention relates to a device for generating gas bubbles in a liquid in a container, including at least one rotatable hollow shaft arranged horizontally in at least one container; at least one gassing disc arranged vertically on the at least one hollow shaft; and at least one feed line for supplying at least one compressed gas to the interior of the at least one hollow shaft, said compressed gas being brought into the feed line and hollow shaft directly, without a liquid carrier.

Devices suitable for use in an advanced oxidation method for organic and inorganic pollutants deploying OH* radicals and ozone is disclosed. Optionally, a first discharge device, providing OH* radicals and second discharge device providing ozone, are combined to provide desirable chemical and biocidal characteristics. Further, efficient mixing systems for transferring the radicals to the target fluid are disclosed.

Systems for treating a viscous medium are illustrated. The systems may comprise a primary source of pressurized treatment fluid, a fluidic transfer assembly, and a helical mixing element. The fluidic transfer assembly comprises a fluidic transfer chamber and a fluid outlet. The primary source of pressurized treatment fluid is in fluidic communication with the fluid outlet of the fluidic transfer assembly via the fluidic transfer chamber. The primary source of pressurized treatment fluid is in fluidic communication with the fluid outlet of the fluidic transfer assembly via the fluidic transfer chamber. The helical mixing element comprises an interior treatment fluid passage and external injection ports. The fluid outlet of the fluidic transfer assembly is in fluidic communication with the external injection ports of the helical mixing element via the interior treatment fluid passage of the helical mixing element. The systems may be incorporated into methods for treating a viscous medium.

An air-stirred tank reactor (ASTR) and methods of use thereof are described herein. The ASTR is equipped with an impeller or set of impellers that mechanically mixes a liquid culture, as well as sparges gas into the liquid medium. The impeller can further have lighting sources that can illuminate the liquid culture. Unlike conventional bioreactors, the ASTR provides superior liquid mixing, efficient gas mass transfer, and a low-shear culture environment through appropriate impeller rotational speed and sparging rate.

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 stirrer device, especially for the mixing of a fluid with at least one other fluid, includes at least one fluid dispersing unit able to turn about an axis of rotation, having at least one exit opening for at least one fluid discharge, and the stirrer device has at least one optimization unit, which in at least one operating state increases at least a differential pressure at the exit opening.

A submersible aeration equipment (10) for wastewater treatment in which partial vacuum is generated by the rotation of the impellers (22) within the water, which results in the formation of micro-bubbles. The submersible aeration equipment (10) includes a spring-based air intake valve (18) that can control the flow of air through a hollow shaft (12), wherein the opening of the spring-based air intake valve (18) is based on the amount of vacuum in the hollow shaft (12).

A submersible aeration equipment (10) for wastewater treatment in which partial vacuum is generated by the rotation of the impellers (22) within the water, which results in the formation of micro-bubbles. The submersible aeration equipment (10) includes a spring-based air intake valve (18) that can control the flow of air through a hollow shaft (12), wherein the opening of the spring-based air intake valve (18) is based on the amount of vacuum in the hollow shaft (12).

A carbonated beverage maker includes a water reservoir, a carbon dioxide creation chamber, and a carbonation chamber. The water reservoir holds ice water and has a first impeller and a shroud surrounding the first impeller. The carbon dioxide creation chamber contains chemical elements and receives warm water. The chemical elements react with each other to create carbon dioxide when the warm water is introduced to the carbon dioxide creation chamber. The carbonation chamber is connected to the water reservoir and the carbon dioxide creation chamber. The carbonation chamber has a second impeller that includes a stem portion and blades. The stem portion and the blades define conduits therein. The blades create a low pressure region in a lower portion of the carbonation chamber such that carbon dioxide from the carbon dioxide creation chamber flows through the conduits to the low pressure region.