Abstract:
The present invention relates to an aeration device for use in a liquid medium. The device includes a housing adapted to float within the medium such that a top portion thereof remains above a top surface of the medium. The housing has a bottom portion and an open side portion. The device further includes a hose affixed to the bottom portion of the housing substantially parallel to the surface of the liquid medium. The hose has a wall with a plurality of pores formed therein. The device further includes a gas-supplying pipe affixed to the hose and means for supplying a gas to the pipe such that the gas passes through the pipe and into the hose.
Abstract:
A flexible membrane disk diffuser having an improved arrangement for sealing the membrane to the diffuser body. An enlarged sealing bead on the circumference of the membrane fits in an annular channel on the diffuser body. A retainer ring threads onto the diffuser body to compress the sealing bead against a base surface of the channel. A discontinuity on the base surface provides an effective seal with the bead without requiring undue tightening force of the retainer ring. The discontinuity may take the form of a ridge or a rut on the base surface of the channel.
Abstract:
The present invention relates to an aeration device for use in a liquid medium. The device includes a housing adapted to float within the medium such that a top portion thereof remains above a top surface of the medium. The housing has a bottom portion and an open side portion. The device further includes a hose affixed to the bottom portion of the housing substantially parallel to the surface of the liquid medium. The hose has a wall with a plurality of pores formed therein. The device further includes a gas-supplying pipe affixed to the hose and means for supplying a gas to the pipe such that the gas passes through the pipe and into the hose.
Abstract:
Described is an apparatus for the removal of organic substances and/or nitrogen sources from an aqueous medium by exposing the aqueous medium to the action of microorganisms supported on a gas permeable, water impermeable layer, or on and/or in a three dimensional microbial support layer, that is proximate a gas delivery layer through which gas, preferably, oxygen-containing gas, is supplied to the gas permeable layer such that it diffuses through the gas permeable layer and is supplied to the microorganisms.
Abstract:
A mixing, aerating or oxygenating apparatus to aerate or oxygenate ponds, rivers or lakes, sewage or effluent treatment lagoons or beds or to airstrip volatile compounds from water or other solutes by distributing gas through a piped system having a plurality of outlets branching from a common distribution line. In order to deliver a desired quantity of air or oxygen at each outlet, a constant flow regulator is disposed in each outlet which limits the flow to a set amount when the pressure in the pipe system exceeds a predetermined minimum value. In one embodiment, the regulator is chosen to achieve this irrespective of pressure drop along the distribution line. In another embodiment, the regulator is chosen to give the desired output with no pressure drop along the distribution line.
Abstract:
An aeration system for a submerged membrane module has a set of aerators connected to an air blower, valves and a controller adapted to alternately provide a higher rate or air flow and a lower rate of air flow in repeated cycles. In an embodiment, the air blower, valves and controller, simultaneously provide the alternating air flow to two or more sets of aerators such that the total air flow is constant, allowing the blower to be operated at a constant speed. In another embodiment, the repeated cycles are of short duration. Transient flow conditions result in the tank water which helps avoid dead spaces and assists in agitating the membranes.
Abstract:
A fine bubble diffuser membrane used in the aeration of wastewater is treated with biocide to inhibit growth and accumulation of biological materials on the membrane. The membrane may be constructed of EPDM rubber or urethane. The biocide may be carbolic acid either dispersed throughout the membrane or applied as a coating on the surface of the membrane exposed to the wastewater. The membrane is a flexible and elastic structure impervious to liquid and provided with slits that close to prevent wastewater inflow in the absence of aeration and open in response to aeration pressure to discharge air into the wastewater.
Abstract:
A process for treating BOD, nitrogen and phosphorus containing wastewater. The process includes introducing wastewater influent into an anaerobic zone having activated sludge and mixing the wastewater influent with the activated sludge in the anaerobic zone to form a mixed liquor. The mixed liquor is introduced into an oxygen-deficit aeration zone, and denitrified mixed liquor from the oxygen-deficit aeration zone is recycled to the anaerobic zone for mixing therein with wastewater. The process also includes transferring the mixed liquor from the oxygen-deficit aeration zone to an oxygen-surplus aeration zone, transferring a portion of the mixed liquor from the oxygen-surplus aeration zone to a settling zone wherein a supernatant is separated from settled sludge and recycling at least a portion of the settled sludge to the oxygen-deficit aeration zone as recycled activated sludge.
Abstract:
An apparatus for securing an aerating device, for aerating water with fine bubbles, to an air supply conduit is provided. The aerating device is detachably connected to a mounting that is secured to an air supply conduit. The mounting is provided with an undercut groove into which engages the projection of the aerating device in the manner of a dovetail connection, thereby providing a horizontal insertion movement of the aerating device.
Abstract:
A flotation plant comprises air supply means with which air bubbles can be supplied to a basin to which untreated water is supplied so as to cause flakes suspended in the untreated water to float by aid of the air bubbles; the air supply means includes strip- or plate-shaped aeration means having perforated membranes and to be installed in the bottom region of said basin.