Provided is an outer enclosure for a turbo blower in which a turbo blower is installed, which includes a housing forming an exterior of the outer enclosure, an outside air inflow chamber which is a space partitioned in one side inside the housing and which communicates with the outside through an outside air inlet, an inverter chamber which is a space partitioned in the other side inside the housing, a motor chamber which is a space partitioned in an upper portion of a space positioned between an inverter chamber and the outside air inflow chamber, and in which a turbo blower including an intake nozzle communicating with the outside air inflow chamber is positioned, and a first refrigerant discharge port is positioned on one side, a refrigerant inflow chamber which is a space in a lower portion of the motor chamber and which communicates with the outside through a refrigerant inlet, in which the upper and lower portions of the inverter chamber are in communication with the motor chamber and the refrigerant inflow chamber, respectively, and the refrigerant inflow chamber is communication with the motor chamber.

An aerator for aerating water comprises a distribution system for distributing air below the water surface and a compressor with an air inlet and at least one air outlet. The compressor is configured to be placed below the water surface. The infiltration of water at the air inlet is prevented by an intake pipe with one open end above the water surface and the other open end has a watertight connection to the compressor. The distribution system has a watertight connection to the air outlet and, due to its nature or by at least one valve, can hold back water. The housing is in thermal contact with the water to cool the compressor. The compressor is a centrifugal compressor that comprises an impeller that is driven by a shaft that it is mounted on air bearings, magnetic bearings or both.

An aeration nozzle is provided, having on one end an air supply port (16a) connected to an aeration pump (13) and a waste water suction port (17) for suctioning waste water in a processing tank (3, 4), and having a micro-bubble generation unit (18), provided facing the air supply port, for mixing air supplied by the air supply port and waste water suctioned from the waste water suction port and generating micro-bubbles (9), wherein a plurality of blades of cylindrical micro-bubble generators (19) included in the micro-bubble generation unit (18) is configured such that tip ends of the blades are formed so as to face one another around the center of the cylindrical micro-bubble generators (19a, 19b); and by being formed from an elastic member (such as rubber), the tip ends of the blades are configured so as to bend with the base ends as starting points.

A wastewater purification apparatus includes an elongate tank, which has an inflow for feeding wastewater, a first vertical agitator with a first hyperboloid agitator body mounted on a vertical first agitator shaft and provided in a first treatment portion downstream of the inflow on the first narrow side, a second vertical agitator with a second hyperboloid agitator body mounted on a vertical second agitator shaft and provided in a second treatment portion downstream of the first vertical agitator, an aeration device with a fan for aerating wastewater received in the tank, a first drive device for rotating the first hyperboloid agitator body in a first rotation direction, a second drive device for rotating the second hyperboloid agitator body in a second rotation direction opposite the first rotation direction, and a decanter for discharging purified wastewater in a third treatment portion on a second narrow side opposite the first narrow side.

A method for aerating water in a treatment basin includes positioning at least one bridge above an upper surface of the water in the basin; providing a retrievable mounting frame assembly; securing a guide rail assembly to the bridge; transporting the mounting frame assembly on a transport device to a selected position on the walkway near the guide rail assembly; securing a transfer crane to the walkway proximate the guide rail assembly; transferring the mounting frame assembly from the transport device for connection to the a one guide rail assembly; connecting the mounting frame assembly to the guide rail assembly to provide a supply of air to the first air distribution conduit; moving the retrievable mounting frame assembly from a first position above the upper surface of the water to a second position below the water; and initiating a flow of air to the first air distribution conduit.

A method for aerating water in a treatment basin includes positioning at least one bridge above an upper surface of the water in the basin; providing a retrievable mounting frame assembly; securing a guide rail assembly to the bridge; transporting the mounting frame assembly on a transport device to a selected position on the walkway near the guide rail assembly; securing a transfer crane to the walkway proximate the guide rail assembly; transferring the mounting frame assembly from the transport device for connection to the a one guide rail assembly; connecting the mounting frame assembly to the guide rail assembly to provide a supply of air to the first air distribution conduit; moving the retrievable mounting frame assembly from a first position above the upper surface of the water to a second position below the water; and initiating a flow of air to the first air distribution conduit.

Provided is a wastewater treatment system. The wastewater treatment system includes an equalization (EQ) tank which receives contaminated wastewater having a high nutrient content from a plant, a dissolved air flotation (DAF) system and an on-site oxygen generation system which provides gas phase oxygen to the wastewater treated in the equalization (EQ) tank and/or the dissolved air flotation (DAF) system. The dissolved air flotation system includes at least one air dissolved air flotation vessel which may house an aerator grid assembly having a perforated lateral diffuser and optionally, a primary aerator assembly.

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.

Disclosed is a method for managing the operation of an apparatus for injecting oxygen into a purification basin. The oxygen notably being used by the biomass present in the purification basin to consume the pollution present in an effluent feedstock contained in the basin. The method comprises varying a rotational speed of the shaft by using a frequency variator, wherein an applied variation in speed is between plus 15% and minus 15% of the nominal speed of the shaft.

Provided is a clarifier unit of wastewater treatment system and a system comprising the unit, the unit including a treatment tank having a bottom wall, side walls, influent inlet, clarified water outlet and a sludge discharge outlet; wherein the unit has an oxygen supply assembly, including one or more oxygen supply elements confined to a bottom portion of the tank, each of which includes (i) a water-tight enclosure including oxygen-permeable membranes permitting oxygen permeation by, for example, a diffusion from the enclosure to a surrounding medium, and (ii) a gas inlet for receiving an oxygen-containing gas and a gas outlet for removal of gas.