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4585555 |
Barrier oxidation ditch having increased flow efficiency and oxygen transfer efficiency
An improved barrier oxidation ditch is provided which has an inclined duct for the induced flow, whereby energy in the dammed-up momentum is more efficiently released. This induced-flow duct is...
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4581182 |
Submersible mixer with air injection
A submersible mixer apparatus for circulating liquid in a body of water, such as a sewage lagoon, includes an upright beam member closed to form an air reservoir chamber and upper and lower...
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4581137 |
Gas diffuser tube assembly
An improved gas diffuser tube assembly, particularly for diffusing bubbles of oxygen gas into liquid sewage during treatment thereof, is provided. The assembly is characterized by a construction...
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4576720 |
Subcyclonic jet recirculation grit removal system
Methods and apparatus for subcyclonic grit separation under aeration conditions utilizing elevated wastewater hydraulic jet recirculation systems.
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4569757 |
Adapter skirt for static aerator mixer
A skirt for a sewage aerator mixer is supported on a bubble generator pipe beneath the mixer structure in a sludge basin or directly on the floor of the basin in surrounding relation to the lower...
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4564447 |
Purification apparatus
An apparatus for high-degree purification of liquid contaminated by solvent comprises a vessel (1) of flat configuration, the liquid (16) being caused to flow through the vessel at a given level...
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4555335 |
Ozonator feed system
A system for injecting air mixed with ozone into a water tank at normal line pressure of about 20 to 60 psi. Water from the outlet of the tank at, or near, the bottom of the tank is pumped through...
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4549969 |
Process and an apparatus for enriching liquids with oxygen
Process and apparatus for enriching liquids with oxygen by means of a catalyst and a liquid which gives off oxygen under the effect of that catalyst. The process involves passing the...
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4536295 |
Method for separating coarse particles from a liquid
For the purpose of separating coarse particles from a liquid such as water, e.g. in the cellulose industry, laundries etc., a vertical container is used in which a nozzle receives liquid from a...
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4532038 |
Flow control apparatus for aerobic sewage treatment
In aerobic wastewater treatment systems, such as sewage treatment, liquid in a channel spanned by a liquid-tight barrier is moved past the barrier by a liquid-gas contact pump, thus dissolving a...
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4512895 |
Pumpless clarifier apparatus and process for operation thereof in combination with a draft tube circulator/aerator
An integral clarifier is provided that operates without a pump by deriving the clarifier feed stream and its accompanying pump head from the flow being pumped through the draft tube of a draft tube...
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4512887 |
Chlorine injector for treatment of effluent
A chlorine injector for treatment of effluent includes apparatus which provides two separate vacuum forces that supplement each other to create sufficient vacuum force to draw chlorine from a...
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4501664 |
Method and apparatus for treating organic wastewater
A method and apparatus for achieving high quality treatment of organic waste water (both domestic and industrial types), which can also be used to treat organically contaminated water supplies or...
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4497749 |
Check valve for ammonia injector apparatus
Apparatus for injecting ammonia into water, or more particularly, into hard water. Apparatus includes a check valve having a plurality of spaced recessed annuli therearound communicating with an...
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4495114 |
Leaf spring diffuser with amplitude limit
A leaf spring diffuser for use in an aeration tank of a water treatment system. An amplitude-limiting stop is mounted on each vibrating extremity of the diffuser leaf spring to project into the...
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4491518 |
Device for selectively taking up a layer of light liquid from the surface of a sheet of water
A device for depolluting a water sheet comprising a hull having a central portion protruding with respect to two side portion which delimit with the central portion delivery pipes to separators....
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4488508 |
Aeration/circulation method and apparatus utilizing low pressure air
A low pressure valveless floating aeration system for providing oxygen and circulation to a water impoundment, utilizing one or more floating elongate members supporting a substantially uniform...
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4487699 |
Sewage sludge treatment apparatus and process
The present invention relates to an apparatus and process for treating sewage sludge in which the sludge preferably has its pH adjusted to an acidic range. Then the sludge is conveyed to a vessel...
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4469596 |
Fluid transport conduit system in equilibrium with its environment
A conduit system for transporting municipal or industrial wastes economically and efficiently is shown. The conduit system comprises a conduit which is located within a body of water and which has...
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4464257 |
Apparatus for the treatment of wastewater sludge
According to an embodiment thereof, the apparatus comprises a pair of reaction vessels in which, sequentially, to treat the sludge. Both vessels are pressurized, and the first thereof has an...
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4464259 |
Hydraulic horizontal mixer
A hydraulically powered mixing aerator rides on an upright beam member for submersion in a body of water such as an equalization basin, oxidation ditch or sludge holding tank used in sewage...
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4462903 |
Apparatus for purifying waste water
The present invention relates to a device for the catalytic oxidation purification of waste water inside a reaction vessel. The vessel includes a front wall, a back wall, two side walls...
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4457842 |
Method of and apparatus for separating solids from a flushing liquid
In the separation of solids out of a flushing liquid such as used in flushing out boreholes and the like drilled or cut in rock, concrete, masonry and similar materials, a flocculant is added to...
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4455239 |
Clarification of fluids
There is provided an apparatus for clarifying fluid in a fluid container, e.g., a tank, basin or lagoon. The apparatus comprises a first means for defining a quiescent zone in the container. The...
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4455232 |
Method and apparatus for induced-flow circulation and pressurized aeration in a barrier oxidation ditch
A barriered circulator/aerator in the endless channel of a barrier oxidation ditch provides a directly pumped flow of mixed liquor into a central liquor inlet zone and an energy-release induced...
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4452701 |
Biological treatment of sewage
Sewage is oxygenated and clarified in a tank having an open-bottomed stilling chamber located above an open-topped chamber. Oxygenated sewage is discharged into the stilling chamber where its...
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4451373 |
Ring channel aeration apparatus and method
In a ring channel aeration system, circulation is provided by one or more hydraulic jumps while the major portion of the energy consumed in aeration is allocated to the release of oxidative process...
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4451367 |
Sedimentation tank
A sedimentation tank comprises two sedimentation sections each extending from a narrow end at a common pole to a wide end on the periphery of the structure. The sections are walled by a double...
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4448685 |
Aerating apparatus utilizing rotating impeller vane
An apparatus for aerating a body of stagnant water to neutralize the pollutants therein. The apparatus draws fresh ambient air above the surface of the water and forcibly disburses the air under...
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4443335 |
Aeration device
An aeration device for introducing air into a pool of water. The device basically comprises a cylindrically shaped main body portion and a retaining ring for pivotally securing a generally...
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4443338 |
Conversion of plug flow and complete mix aeration basins to barrier oxidation ditches
Methods are provided for converting both plug flow and complete mix basins of the prior art into barrier oxidation ditches. Circulator/aerators are described that can be prefabricated and dropped...
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4440645 |
Dissolving gas in a liquid
A method and an apparatus for dissolving gas in a body of sewage comprising providing a skirt member having a lower open end extending upwardly from said body of sewage to define a volume of said...
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4439316 |
Water purifier
A water purifier comprising a cylinder provided at its lower portion with an air chamber and water sucking holes and adapted to be intermittently supplied with compressed air and water, a...
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4436675 |
Multistage water purification apparatus
A multistage water purification method in which water purifiers are arranged in stages in water regions of different depths. Air is made to ascend intermittently in each depth region by the water...
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4430215 |
Arrangement for biological cleaning of water
Arrangement for the biological cleaning of water, said arrangement being suitable for large urban stations for cleaning sewage or for the cleaning of waste waters of industrial plants. The...
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4430225 |
Aeration tank for activated-sludge process sewage treatment
A pressurized aeration tank is provided which comprises an inner barrel arranged on the tank axis and an axial-flow impeller of optimum characteristics mounted therein, the inner barrel and the...
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4416781 |
Treatment of biologically-degradable waste
A method for the secondary treatment of sewage (and apparatus therefor) having a step in which sewage is circulated in a system having a riser and a downcomer communicating with each other at their...
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4411780 |
Sewage disposal plant
A sewage disposal plant comprising a deep-well type sewage treatment tank, which is provided with string-shaped contact members stretched therein, and which minimizes the installation area; a...
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4409100 |
Liquid aerating device
An aerator (2) comprises a motor (10) having a propeller (18). A slotted cage (30) surrounds propeller (18) and prevents marine life from being drawn in to propeller (18). Liquid will be ejected...
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4407718 |
Long vertical shaft bioreactor with pressurized head tanks
An improvement is provided in the operation of a long vertical shaft bioreactor in the treatment of waste which comprises circulating waste liquor and oxygenating gas through the bioreactor in...
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4405456 |
Clarifier apparatus
A two stage clarifier apparatus for producing a clarified effluent from mixed liquor in a sewage treatment system wherein mixed liquor is partially clarified in a first quiescent zone in the first...
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4392954 |
Sewage ventilating basin
A sewage ventilating basin of a sewage treatment plant comprises a sewage container which is sunk into the ground and into which project three vertical tubes which connect the surface water of the...
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4391703 |
Marine sewage treatment with biological filter
The present disclosure is directed to a sewage disposal system having a central aeration chamber flanked on each side by a pair of biological filters each containing tiers of buoyant plastic hollow...
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4390422 |
Apparatus for the biological purification of water
Apparatus for the biological purification of water with the separation of activated sludge by fluid filtration with the spontaneous returning of activated sludge into the activation area or zone,...
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4377395 |
Process and apparatus for gassing liquids
The invention provides a process for multistep gassing of liquids streaming downward in a gassing apparatus, which comprises using a gassing apparatus consisting of at least two superposed...
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4376702 |
Waste disposal apparatus
Waste disposal apparatus suitable for the collection of waste from a vacuum sewer system, which comprises a tank (1) having a waste inlet (2) and a waste outlet (10, 12) and means (4) for reducing...
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4374730 |
Process and apparatus for the biological purification of sewage
A process for the biological purification of effluent which is contaminated with nitrogen in the form of ammonium, nitrite or nitrate ions or in the form of organic compounds, by oxidizing the...
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4372856 |
Process and system for anaerobic treatment of waste
The invention provides for a sealed mix tank having two chambers: one chamber mixes waste material and water to form a slurry and collect gas, particularly ammonia gas, during the digestive...
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4372851 |
Multi stage flocculation treatment system
Systems for flocculation processing in water purification treatment in which a first jet flash mixing field of relatively high specific energy requirement and turbulence intensity is provided for...
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4365938 |
Modular low head high volume water pump and aquaculture system
A water pump system having a float and underwater intake with discharge into an increasingly sized series of consecutive pipes, open to the water body, for entraining additional water with that...
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