| Patent Number |
Title Of Patent |
Date Issued |
| RE37181 |
Process for removal of dissolved hydrogen sulfide and reduction of sewage BOD in sewer or other |
May 22, 2001 |
| Removal of dissolved hydrogen sulfide and a reduction in BOD is achieved by the addition of nitrate ions to waste systems in an amount sufficient to stimulate growth of bacteria which utilize dissolved hydrogen sulfide in their metabolism. Specifically, about 2.4 lbs. .Iadd.nitrate . |
| 7208090 |
Wastewater treatment control |
April 24, 2007 |
| Wastewater treatment controls that maintain the ORP of a mixed liquor at a relatively stable value during a wastewater treatment process such as an aerated-anoxic wastewater treatment process. The wastewater treatment control may compare a setpoint value of ORP and a measured value of OR |
| 7147785 |
Electrodeionization device and methods of use |
December 12, 2006 |
| The present invention generally relates to purification systems, and to sanitization and/or sealing of the purification system. The purification system includes an electrodeionization device which can comprise one or a plurality of stages. The electrodeionization device can be constructe |
| 7138049 |
Apparatus for reducing nitrate demands in the reduction of dissolved and/or atmospheric sulfides |
November 21, 2006 |
| A method and apparatus for treating wastewater streams by adding, either separately or as a mixture, a nitrate containing compound and an alkaline material in an amount sufficient to achieve a lower concentration of atmospheric hydrogen sulfide and dissolved sulfides downstream of the |
| 7135109 |
Filter screen assembly |
November 14, 2006 |
| A fine filter screen assembly includes a frame assembly and a rotatable shaft supported in the frame. A drive is configured to controllably rotate the shaft and at least one drive drum is positioned on the shaft for rotation therewith. The drive drum has an external surface that is s |
| 7108781 |
Enhanced air and water purification using continuous breakpoint halogenation with free oxygen ra |
September 19, 2006 |
| Continuous breakpoint halogenation with hydroxyl free radical species is used to increase the rate of sanitization a water system and maintain a high rate of oxidation in the bulk water of the pool, spas, and other water systems despite the presence of accumulated demand. Undesirable |
| 7101417 |
Activated carbon for odor control and method for making same |
September 5, 2006 |
| An activated carbon/metal oxide filter element is disclosed. The filter element may be prepared by blending an activated carbon, a metal oxide, and a binder to form a filter media mixture, shaping the filter media mixture into a filter body. The filter body may be calcined to form a |
| 7087172 |
Methods for reducing nitrate demands in the reduction of dissolved and/or atmospheric sulfides i |
August 8, 2006 |
| A method and apparatus for treating wastewater streams by adding, either separately or as a mixture, a nitrate containing compound and an alkaline material in an amount sufficient to achieve a lower concentration of atmospheric hydrogen sulfide and dissolved sulfides downstream of the |
| 7083733 |
Water treatment system and method |
August 1, 2006 |
| A water treatment system provides treated or softened water to a point of use by removing a portion of any hardness-causing species contained in water from a point of entry coming from a water source, such as municipal water, well water, brackish water and water containing foulants. The |
| 7063787 |
Filter media retaining cap and hold down grid |
June 20, 2006 |
| The invention recites a filtration tank including a chamber for holding liquid to be filtered, the filtration tank includes a fluid inlet for providing liquid to the chamber. The filtration tank further includes a fluid outlet and at least one filter block disposed between the inlet and |
| 7022269 |
Activated carbon for odor control and method for making same |
April 4, 2006 |
| An activated carbon-metal oxide matrix is disclosed. The activated carbon-metal oxide matrix may by obtained by a method including the steps of: preoxidizing a carbon material, grinding the preoxidized carbon material; mixing the ground preoxidized material with a metal oxide to form |
| 7014783 |
Flow splitting weir |
March 21, 2006 |
| A method of minimizing head loss in a filter system including a plurality of drop pipes, a plurality of filter cells having a maximum influent level, and a distribution box having a maximum influent level, a base, and a plurality of distribution cells. The method includes positioning a |
| 7014754 |
Tilt-out frame for a filter screen |
March 21, 2006 |
| A filter screen that is used in filtering water and that includes a frame and a grid assembly that is supported by the frame for movement. The grid assembly includes a continuous unbroken drive chain having a guide link, and a screen panel. The screen panel is coupled to the guide link f |
| 6997328 |
Grit removal assemblies |
February 14, 2006 |
| An assembly for removing grit from a fluid comprising a tank with a fluid inlet into the tank and a discharge from the tank. A flow directing assembly is positioned in the tank adjacent the fluid inlet and includes a substantially U-shaped surface opposite the fluid inlet such that fluid |
| 6991735 |
Free radical generator and method |
January 31, 2006 |
| An apparatus for generating free radical species can be used to sanitize water systems. The apparatus generates hydroxyl free radical species using substantially pure water, or using a liquid that is substantially free of oxygen-reactive species, to maximize free radical species gene |
| 6991726 |
Filter having a media retaining plate |
January 31, 2006 |
| The invention recites a filtration system including a block including a first wall and a second wall substantially parallel to the first wall. A top surface that is substantially perpendicular to the first wall is disposed between, and coupled to, the first and second walls to at least |
| 6990997 |
Fluid distribution device |
January 31, 2006 |
| An apparatus and method for distributing a fluid. A fluid distribution device includes a flow chamber comprising an inlet and an outlet, an equalization chamber; and a diaphragm separating the flow chamber and the equalization chamber, wherein a valve positioned in a flow path between |
| 6942789 |
Filter screen assembly |
September 13, 2005 |
| A waste water filter screen assembly that has a substantially open foot section to promote more efficient flow through. The rotating grid is generally free hanging. The present invention further provides a drive assembly with square, high friction drive drums mounted on the drive sha |
| 6858192 |
Activated carbon for odor control and method for making same |
February 22, 2005 |
| An activated carbon-metal oxide matrix is disclosed. The activated carbon-metal oxide matrix may by obtained by a method including the steps of: preoxidizing a carbon material, grinding the preoxidized carbon material; mixing the ground preoxidized material with a metal oxide to form |
| 6849190 |
Methods for polymer addition control for water treatment |
February 1, 2005 |
| Systems and methods for polymer addition control for wastewater treatment. In a water treatment process where flocculating agents are used to promote solids aggregation, intrinsic physical properties of the liquid rich stream following separation may be continuously measured in order to |
| 6849180 |
Flow splitting weir |
February 1, 2005 |
| The invention recites a filter including a plurality of filter cells, each filter cell including a bottom surface and at least one side surface and defining a maximum influent level. The filter also includes a distribution box including a base and at least one wall, the base and wall at |
| 6830684 |
Integrated liquid and gas distribution device for underdrain block laterals |
December 14, 2004 |
| The invention recites a filter comprising a block including an outer wall defining an inner chamber and a block exterior, and a conduit having a conduit wall, a first conduit end, a second conduit end, and an inner flow path providing fluid communication between the first and second cond |
| 6824662 |
Electrodeionization apparatus and method |
November 30, 2004 |
| An electrodeionization apparatus and method for purifying a fluid. A fluid, such as water, can be purified by removing weakly ionizable species from the fluid. Weakly ionizable species may be dissociated at different pH levels to facilitate removal from the fluid in an electrodeionizatio |
| 6818129 |
Ion exchange removal of metal ions from wastewater |
November 16, 2004 |
| A novel process and apparatus are disclosed for cleaning wastewater containing metal ions in solution, hydrogen peroxide, and high solids, e.g., greater than about 50 mg/l particulate solids. A carbon adsorption column removes hydrogen peroxide in the wastewater feed containing high |
| 6758954 |
Electrodeionization apparatus with resilient endblock |
July 6, 2004 |
| An electrodeionization apparatus comprising an endblock formed from a resilient material, and method for making the same. The resilient material may include various types of thermoplastic elastomers, such as, styrene block copolymers, copolyesters, plolyurethanes, polyamides, thermoplast |
| 6346195 |
Ion exchange removal of metal ions from wastewater |
February 12, 2002 |
| A novel process and apparatus are disclosed for cleaning wastewater containing metal ions in solution, hydrogen peroxide, and high solids, e.g., greater than about 50 mg/l particulate solids. A carbon adsorption column removes hydrogen peroxide in the wastewater feed containing high |
| 6330835 |
Scotch yoke mechanism for secure track sliding |
December 18, 2001 |
| A reciprocating scotch yoke drive mechanism connectable to a motor drive shaft, includes a yoke member connectable to the shaft which moves the yoke member in a linear reciprocating motion and a guide having one or more slide tracks configured to define a reciprocal sliding path for the |
| 6293975 |
Fuel composition |
September 25, 2001 |
| A composition for use as a fuel comprising: less than about 10% by weight water; greater than about 35% by weight solids and from about 30 to about 65% by weight of liquid hydrocarbons; the solids comprising inorganic solids and combustible organic solids that are insoluble in methylene |
| 6078178 |
Water quality indicating apparatus having self-cleaning test probes |
June 20, 2000 |
| Water purity indicating apparatus is adapted to operate on AC input power and includes a housing and a pair of test probes extending from the housing for measuring a resistance of water. Also included is a circuit connected to the test probes and provided within the housing for outpu |
| 5792359 |
Sealing shoe for celless travelling bridge filter |
August 11, 1998 |
| A backwash sealing shoe is provided for a filtration system including a tank having an undivided filtration bed and a plurality of side-by-side headers within the bed, each header in communication with a respective port in a wall of the tank. The sealing shoe includes a hydraulic section |
| 4255262 |
Hydraulic powered mixing apparatus |
March 10, 1981 |
| Mixing apparatus includes a tank having an upright draft tube extending from above an operating level of liquid contained in the tank to a level near the bottom of the tank, the draft tube being in fluid communication with the tank at a level near the bottom of the tank below the operati |
| 4053408 |
Method of upflow liquid treatment |
October 11, 1977 |
| An upflow liquid treatment method is provided with a vibrator which is used to facilitate the settling of granular solids down through a grate used to hold the solids in a static condition during the treatment cycle when liquid to be treated is passed upwardly through the bed. |
| 3969492 |
Recovery of elemental sulfur from sulfur dioxide bearing waste gases |
July 13, 1976 |
| Process for effecting the selective removal of sulfur dioxide values from industrial waste gases or the like and conversion thereof to elemental sulfur wherein a particularly constituted solution of mixed ammonium phosphates is exposed to absorbent contact with the sulfur dioxide bearing |
| 3960687 |
Electrostatically enhanced removal of sulfur dioxide from gaseous carriers |
June 1, 1976 |
| Closed circuit process for effecting the selective removal of sulfur dioxide values from industrial waste gases or the like wherein a particularly constituted confined solution of mixed ammonium phosphates is exposed to absorbent contact with a sulfur dioxide bearing gas stream in an |
| 3932152 |
Multi-stage blow-pipe construction |
January 13, 1976 |
| An improved multi-jet nozzle construction for pulse-jet dust collectors including a multi-stage blow-pipe assembly incorporating at least one selectively located internal restriction disposed in facing relation to the direction of flow of compressed cleaning gas therethrough. |
