An aerator assembly for wastewater treatment includes a draft tube and an air supply assembly. The draft tube includes a sidewall and presents open top and bottom tube ends. The air supply assembly includes an air supply conduit and a diffuser body. The diffuser body has an inlet aperture and a bubble generator connected to the inlet. The inlet aperture is connected to the air supply conduit such that the bubble generator receives air from a source of air, to which the air supply conduit is connected. The bubble generator has a plurality of air openings for generating fine air bubbles. The diffuser body is sealingly engaged to the sidewall adjacent the bottom tube end so as restrict upward flow of wastewater through the draft tube past the diffuser body.

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.

A hydrogen gas dissolving apparatus 1 has a hydrogen supply unit 2 capable of supplying hydrogen gas, and a hydrogen gas dissolution module 6 for bringing the hydrogen gas supplied from the hydrogen supply unit 2 in contact with and dissolved in water. The hydrogen gas dissolution module 6 has a supply port 62 to which the hydrogen gas is supplied, a hydrogen chamber 63 communicating with the supply port 62 and filled with the hydrogen gas supplied from the supply port 62, and an exhaust port 64 communicating with the hydrogen chamber 63 and discharging the air in the hydrogen chamber 63. The exhaust port 64 is located in a lower part of the hydrogen chamber 63.

Systems for use in one or more sludge or waste collection devices (e.g., containers, vessels or basins). One such system is a sludge removal system for removing sludge from one or more sludge collection devices. The sludge removal system includes one or more sludge removal grids disposed in one or more sludge collection devices. Each sludge removal grid preferably includes at least one header and a plurality of sludge collection laterals. Another such system includes a fluid distribution system for distributing one or more fluids in one or more sludge or waste collection devices. A movement restricting or prevention member is provided in both the fluid distribution and sludge removal systems to prevent or restrict movement of the sludge collection laterals and the fluid distribution laterals away from or towards a floor of a corresponding collection device without anchoring or fixing the laterals to the floor.

A water treatment system using ozone is disclosed. The system includes a container for holding water, an ozone supply configured to supply ozone, and a water treatment device secured at a lower portion of the container. The water treatment device is configured to disinfect the water using ozone in the container. The water treatment device includes a housing having a plurality of openings and a tortuous porous tube in the housing. The tortuous porous tube is configured to receive the ozone from the ozone supply and distribute the ozone into the water.

A water treatment system for aeration of water in a treatment tank includes at least one bridge extending above an upper surface of the water in the tank; a retrievable mounting frame assembly, including a frame, a plurality of aeration elements, a plurality of mounting brackets to secure the aeration elements to the frame, a control arm having secured to the frame at the first end, and a first air distribution conduit coupled to the aeration elements for supplying an air flow to the aeration elements; at least one guide rail system secured to the bridge assembly and extending to the floor of the tank, the guide rail system having at least one or multiple parallel guide rails, a second air distribution conduit coupled to the first air distribution conduit, and an actuatable push-rod positioned between the guide rails and connected to the control arm's second end. The hold-down rod, when actuated, moves the mounting frame assembly along the guide rails from a first position above the upper surface of the water and into a second position on the floor of the tank for aeration of the water. A transport device and a transferrable lifting crane for positioning the frame assembly are moveable along the length of the bridge along guide tracks provided in the bridge.

A gas-liquid mixing control system includes a liquid supply unit, a liquid pressure regulating valve, a gas supply unit, a gas pressure regulating valve, a mixing tank, an output pipe, and a non-electric control flow regulator. The mixing tank communicates with said regulating valves; liquid and gas are mixed in the mixing tank to form mixed fluid. The first end and second end of output pipe communicate with the mixing tank and the machine respectively, making mixed fluid output from mixing tank to machine through the output pipe. The mixed fluid in first end and second end have third flow and fourth flow respectively. Said flow regulator communicates with the output pipe; the mixed fluid passing through said flow regulator has fifth flow. The first flow is not lower than at least one of the fourth and the fifth flow. Additionally, a control method for gas-liquid mixing is disclosed.

A system for mixing and mixing processes and structures are disclosed. In addition a nozzle used for mixing is disclosed.

The invention relates to an aeration system for seawater oxidation in flue gas purification devices, with at least one tubular diffuser (TD), covered by at least two perforated membranes (20), which are positioned one after the other and at a distance to each other in a direction of the central longitudinal axis (A) of the diffuser (TD) as well as at least one support member (SP), which encircles a membrane-free section (FS) of the tubular diffuser at least partially, and at least one sliding means (40), arranged between the support member (SP) and the membrane-free section (FS) of the tubular diffuser (TD).

Under one aspect, a fermentation system includes a fermentation vessel having a straight wall length L and an inner diameter D. The fermentation system also can include a source of a gas including a reactive gaseous component. The fermentation system also can include spargers spaced apart from one another along the straight wall length L of the fermentation vessel and configured to introduce bubbles of the gas into fermentation broth within the fermentation vessel. The release of the bubbles of the gas by each of the spargers can establish a respective mixing zone within the fermentation broth within the fermentation vessel. Each mixing zone can have substantially the same volumetric uptake rate of the reactive gaseous component by the fermentation broth as each other mixing zone.