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| Number | Title | Issue Date |
| 7794577 | Spacer for filled cell electrodialysis A spacer element (1) is disclosed having an integral screen for use in filled cell electrodialysis. The spacer (1) has a continuous portion (2) impermeable to flow and a screen (3) which spans a centrally-located flow treatment region tha... | 09/14/2010 |
| 7662267 | Device and method for electrodialysis An improved apparatus and operating method related thereto for deionizing water to produce substantially pure water using electric field and ion exchange materials are disclosed, including embodiments incorporating one or more of the novel features of brine and elec... | 02/16/2010 |
| 7371326 | Water treatment/remediation system A treatment system passes feed water containing a contaminant such as perchlorate through a bed of strong base anion exchange resin that has been placed in a form (e.g., in sulfate form) to selectively capture the contaminant while passing other ions (e.g., nitrate)... | 05/13/2008 |
| 7264737 | Control of water treatment system with low level boron detection A water treatment system and method including a membrane-based boron removal unit includes a boron analyzer for detecting the concentration of boron in a treatment stream. The boron removal unit can be a reverse osmosis (RO) or electrodeionization (EDI) treatment un... | 09/04/2007 |
| 7094325 | EDI and related stacks and method and apparatus for preparing such Apparatus and method are disclosed for introducing ion exchange or other particulates into compartments of an already-assembled electrodeionization or comparable stack by modulating a flow of slurry into the compartments with slugs of gas such as air. The air propel... | 08/22/2006 |
| 7087654 | Ion exchange and electrochemical methods and devices employing one-step quaternized and polymerized anion selective polymers The invention provides ion exchange and electrochemical methods and devices employing anion exchange polymers produced by substantially simultaneous quaternization and polymerization reactions. Anion selective polymers are produced in accordance with the invention b... | 08/08/2006 |
| 6796436 | Method and apparatus for preparing pure water Water treatment systems or assemblies are normally tested after construction, at least for leaks, prior to shipping or storage. Pressure testing with a gas is hazardous, so testing with water is a standard method. After testing, the water is displaced from the syste... | 09/28/2004 |
| 6723246 | Filter cleaning method A method of cleaning a filter clogged with flocculating materials is provided. The method comprises determining the flocculated materials clogged on the filter and adding a dispersing agent to break up said flocculated materials to form dispersed precipitates. Then ... | 04/20/2004 |
| 6652758 | Simultaneous ammonia and fluoride treatment for wastewater An improved method of treating wastewater to remove ammonia and fluoride is provided. The method comprises the steps of chemical destruction of ammonia with an oxidizing agent, followed by treatment with calcium salts to precipitate insoluble calcium fluo... | 11/25/2003 |
| 6645385 | System and method for removal of fluoride from wastewater using single fluoride sensing electrode A system for removing fluoride from wastewater is provided. The system comprises a reaction tank for processing said wastewater by adding calcium salts, a filtration tank for removing the precipitated fluoride formed in the reaction tank, a single fluorid... | 11/11/2003 |
| 6613230 | Method for simultaneous removal of arsenic and fluoride from aqueous solutions A method of removing arsenic and fluoride from aqueous solutions in the same process is provided. Specifically, the pH of the aqueous solution is adjusted to a pH in the range of about 5 to 8. A combination of calcium salts, and ferric or aluminum salts a... | 09/02/2003 |
| 6582605 | Method of treating industrial waste waters A method of treating industrial wastewaters is provided. Specifically, the wastewater includes one or more organic contaminant materials and is pre-treated prior to filtering by the following steps The pH of the wastewater is adjusted to a pH in the range... | 06/24/2003 |
| 6410672 | Ion exchange and electrochemical methods and devices employing one-step quaternized and polymerized anion selective polymers The invention provides ion exchange and electrochemical methods and devices employing anion exchange polymers produced by substantially simultaneous quaternization and polymerization reactions. Anion selective polymers are produced in accordance with the ... | 06/25/2002 |
| 6221248 | Styrene sulfonate cation exchange membrane Novel styrene sulfonate-based polymers and cation exchange membranes which are particularly suitable for use in electrodialysis of whey and improved methods for electrodialysis of whey are disclosed.... | 04/24/2001 |
| 6126805 | Electrodialysis including filled cell electrodialysis (electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 10/03/2000 |
| 6117297 | Electrodialysis apparatus An integral, monolithic frame-membrane is disclosed, such frame-membrane having a semi-permeable membrane portion and integral therewith a frame portion, the frame portion having one or more cavities, each cavity juxtaposed to the membrane portion, each c... | 09/12/2000 |
| 6009136 | Damped storage rack for nuclear fuel assemblies A storage rack for storing nuclear fuel rod assemblies is provided with an array of cell housings having support elements which are preloaded against the adjacent corner of the adjacent cell housing. The support elements are fixed to the outer corner of o... | 12/28/1999 |
| 5948230 | Electrodialysis including filled cell electrodialysis (Electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 09/07/1999 |
| 5891328 | Membrane-frame for processes including electrodialysis An integral, monolithic frame-membrane is disclosed, such frame-membrane having a semi-permeable membrane portion and integral therewith a frame portion, the frame portion having one or more cavities, each cavity juxtaposed to the membrane portion, each c... | 04/06/1999 |
| 5814197 | Electrodialysis including filled cell electrodialysis (electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 09/29/1998 |
| 5702582 | Multi-port multi-stream valve apparatus Apparatus for selecting connections from each of two or more inlet streams, at least two of which flow simultaneously, to one or more exit streams of a group of at least two. The apparatus has at least one rotatable first body, a first surface of which is... | 12/30/1997 |
| 5693227 | Catalyst mediated method of interfacial polymerization on a microporous support, and polymers, fibers, films and membranes made by such method The invention pertains to the polymerization of molecules having electrophilic and nucleophilic substituents on the same or different molecules, such polymerization mediated by aminopyridine catalysts which are substantially regenerated during polymerizat... | 12/02/1997 |
| 5679228 | Electrodialysis including filled cell electrodialysis (electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 10/21/1997 |
| 5679229 | Electrodialysis including filled cell electrodialysis (electrodeionization) Improved electrodialysis (ED) stacks are disclosed having one or more components selected from the group: a) cation exchange membranes having ion exchange groups predominantly sulfonic acid groups and a minor amount of weakly acidic and/or weakly basic gr... | 10/21/1997 |
| 5662802 | Solvent extraction process using water absorbing solvent at preselected temperature A method for enhancing solvent extraction of organic wastes from contaminated waste mixtures. A contaminated waste mixture is contacted with a solvent with high driving force for solvation of water, and most preferably with a solvent which is both anhydro... | 09/02/1997 |
| 5656161 | Salt basket for crystallizer and method of use in zero liquid discharge industrial facilities An improved salt basket for dewatering solids, particularly salts resulting from evaporation of industrial wastewaters. The salt basket system includes a pressurizable vessel having a screen floor situated above a bottom liquid collection head, an inlet f... | 08/12/1997 |
| 5616249 | Nanofiltration apparatus and processes Improved nanofiltration apparatus and processes utilizing thin film composite asymmetric nanofiltration membranes in which the thin film semi-permeable barrier layer consists of substantially "all aliphatic" polymer(s) prepared, for example, by the interf... | 04/01/1997 |
| 5575923 | Salt basket for crystallizer and method of use in zero liquid discharge industrial facilities An improved salt basket for dewatering solids, particularly salts resulting from evaporation of industrial wastewaters. The salt basket system includes a pressurizable vessel having a screen floor situated above a bottom liquid collection head, an inlet f... | 11/19/1996 |
| 5510394 | High ionic conductance ion exchange membranes and their preparation It has been discovered (Examples 4, 11 and 17) that certain desirable films will not absorb a sufficient amount of certain desirable, polymerizable monomers as to result in interpolymer membranes having desirable ion exchange properties after polymerizati... | 04/23/1996 |
| 5503729 | Electrodialysis including filled cell electrodialysis (electrodeionization) Electrodialysis ("ED") stacks are disclosed having components selected from the group: a) cation exchange ("CX") membranes and/or CX granules having in at least a surface a predominant amount of sulfonate exchange groups and a minor amount of weakly ioniz... | 04/02/1996 |
| 5474653 | Method for controlling solid particle flow in an evaporator A method for use in an evaporator for selectively controlling the flow of solid particles within the evaporator. The method provides for the separation of solids from a liquid through the use of a separation chamber having a plurality of apertures, each o... | 12/12/1995 |
| 5472622 | Salt basket for crystallizer and method of use in zero liquid discharge industrial facilities An improved salt basket for dewatering solids, particularly salts resulting from evaporation of industrial wastewaters. The salt basket system includes a pressurizable vessel having a screen floor situated above a bottom liquid collection head, an inlet f... | 12/05/1995 |
| 5354903 | Polymers prepared from concentrated solutions of N',N'methylenebisacrylamide This invention is directed to producing highly concentrated solutions of methylenebisacrylamide and thereafter blending with ionogenous acrylic monomers to produce low porosity, highly crosslinked, water insoluble polymers.... | 10/11/1994 |
| 5284879 | High ion exchange capacity polyelectrolytes having high crosslink densities and caustic stability A water or alcohol-water soluble divinyl monomer having anion exchange group(s) and a free exchangable anion is disclosed. These bifunctional divinyl monomers are capable of forming ion exchange materials (membranes and ion exchange resin beads) upon poly... | 02/08/1994 |
| 5203976 | Introducing and removing ion-exchange and other particulates rom an assembled electrodeionization stack Apparatus and method for introducing ion-exchange and other particulates into certain compartments of an assembled electrodeionization stack comprising flowing a slurry of said particulates into the compartments while employing strainers for particulate r... | 04/20/1993 |
| 5203982 | Cation exchange membranes This invention is directed to highly crosslinked, substantially water insoluble, cation exchange membranes prepared from homogeneous solutions comprising at least one substantially water soluble polar solvent (including water) at least one substantially w... | 04/20/1993 |
| 5194189 | Process for manufacturing continuous, supported polymeric sheet from polymerizable liquid starting materials Process for manufacturing supported, solid, polymeric sheets from: (I) liquids containing components reactable to polymers; and (II) one or more indefinitely long, foraminous substrates. A more or less continuous sandwich is formed of such substrate(s) an... | 03/16/1993 |
| 5152901 | Polyamine-polyamide composite nanofiltration membrane for water softening A thin film composite (TPC) ultrafilter/hyperfilter water softening membrane on a microporous substrate is produced by an interfacial polymerization reaction between (1) an aqueous phase comprising a blend of water soluble and water dispersible compounds,... | 10/06/1992 |
| 5147553 | Selectively permeable barriers Apparatus and process for separating a fluid mixture into less permeable and more permeable fractions employing novel selectively permeable barriers comprised of a porous, emulsion treated substrate and a non-porous selectively permeable barrier layer the... | 09/15/1992 |
| 5145618 | Process for manufacturing continuous supported ion selective membranes using non-polymerizable high boiling point solvents Processes for manufacturing in an environmentally friendly way, continuous, supported ion exchange membranes from (I) liquids containing vinyl and related monomeric electrolytes and high boiling solvents, the solvents also being swelling agents for the me... | 09/08/1992 |
