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4454results about "Radioactive decontamination" patented technology

Membrane based fluid treatment systems

A process for removing soluble and insoluble inorganic, organic, and microbiological contaminants from a fluid stream employing a pretreatment module, a post-treatment module, a recycle stream module or any combination thereof, and a membrane module, is provided. The process provided reduces the problems associated with membrane fouling and increases contaminant removal capacity.
Owner:WATERVISIONS INT

Composition and method for forming a sprayable materials cover

An alternative cover for landfill may be formed from a slurry mixture of water, cementitious binder, adhesion enhancing admixture and fiber. These constituents may be mixed and applied to cover landfilled wastes, granular material piles or for soil erosion control. The cover will harden to minimize water infiltration, wind blown dust, odor and affinity to birds, flies and other insects. The water may include tap water, landfill leachate and wastewater. The binder may include Portland cement, blended cement, cement kiln dust, class C fly ash, and / or calcium sulphate hemihydrate. The adhesion enhancing admixture includes water-dispersible polymers. The fibers may comprise shredded paper or wood or plastic fibers.
Owner:CJS TECH

Method for producing chemically bonded phosphate ceramics and for stabilizing contaminants encapsulated therein utilizing reducing agents

Known phosphate ceramic formulations are improved and the ability to produce iron-based phosphate ceramic systems is enabled by the addition of an oxidizing or reducing step during the acid-base reactions that form the phosphate ceramic products. The additives allow control of the rate of the acid-base reactions and concomitant heat generation. In an alternate embodiment, waste containing metal anions are stabilized in phosphate ceramic products by the addition of a reducing agent to the phosphate ceramic mixture. The reduced metal ions are more stable and / or reactive with the phosphate ions, resulting in the formation of insoluble metal species within the phosphate ceramic matrix, such that the resulting chemically bonded phosphate ceramic product has greater leach resistance.
Owner:THE UNITED STATES AS REPRESENTED BY THE DEPARTMENT OF ENERGY

Apparatus suitable for transporting and storing nuclear fuel rods and methods for using the apparatus

Apparatus suitable for transporting and storing nuclear fuel rods comprising a basket having storage cells formed from a honeycomb gridwork of metal plates in a rectilinear configuration, the plates welded to each other at their intersections so that all contiguous corners of the storage cells formed by the gridwork are completely connected so as to allow conduction heat transfer, the metal plates having neutron absorber material positioned in areas which form walls of the storage cells. Method of making an apparatus suitable for transporting and storing nuclear fuel rods comprising a) providing metal plates having slots and having neutron absorber material positioned on sides of the metal plates, b) arranging the plates so that the slots intersect to form a honeycomb gridwork of storage cells having contiguous corners and having the neutron absorbing material on sides of the storage cells, and c) welding the plates to each other at their intersections so that all contiguous corners of the storage cells formed by the gridwork are completely connected so as to allow conduction heat transfer and to provide a rigid structure.
Owner:SINGH KRIS

Reactive compositions for fluid treatment

A method and device for the chemical conversion, filtration and / or purification of fluids water or other solutions containing microbiological and chemical contaminants, such as fluids containing arsenic, chlorine, bacteria, viruses, and cysts, where the fluid is passed through a purification material composed of fluid treatment carbon, metal phosphates, metal oxides, reduced metals, metal silicates, metal sulfates, metal carbonates, metal hydroxides, or combinations thereof. The material may be included in a fixed binder matrix.
Owner:WATERVISIONS INT

Production and use of biosolid granules

This invention relates to the production and use of encapsulated and / or concentrically-constructed fertilizer or bioremediation granules such as, for example, granules of 0.5 mm to 10 mm in diameter constructed so that there are at least two components to the granule including a core with a surrounding capsule or a core with one or more concentric layers that are distinguishable from the core with respect to nutrient content, density, hardness, solubility, composition, microbial content and permeability, as in permeability to odors or the permeability of nutrients that might volatize to the atmosphere or leach into the soil. The basic idea was to create a method for manufacturing and using fertilizer granules, which incorporate multiple concentric layers or a core plus an encapsulating outer layer.
Owner:UNIFIED ENVIRONMENTAL SERVICES GROUP

Reactive compositions for fluid treatment

A method and device for the chemical conversion, filtration and / or purification of fluids water or other solutions containing microbiological and chemical contaminants, such as fluids containing arsenic, chlorine, bacteria, viruses, and cysts, where the fluid is passed through a purification material composed of fluid treatment carbon, metal phosphates, metal oxides, reduced metals, metal silicates, metal sulfates, metal carbonates, metal hydroxides, or combinations thereof. The material may be included in a fixed binder matrix.
Owner:WATERVISIONS INT

Process for preparing reactive compositions for fluid treatment

A method and device for filtration and / or purification of fluids water or other solutions containing microbiological and chemical contaminants, such as fluids containing metals, water treatment chemicals, reactive chemicals and microorganisms, where the fluid is passed through a composite material composed of fluid treatment media with or without a binder matrix in which the filtration media, binder, or support structures, or a combination thereof contains a surface treatment.
Owner:WATERVISIONS INT

Leachate and wastewater remediation system

InactiveUS6960301B2Effective amount of reactionMany difficultyLiquid separation by electricityFlow mixersAdvanced oxidation processFiltration
A compact portable modular wastewater treatment system which integrates several processing technologies to provide a substantially purified water source. A wastewater stream is sent through an initial filtration step. The filtered wastewater is then subjected to electrocoagulation and then further filtered. The resulting stream containing substantially only organics is then treated in an advanced oxidation process which can include passing an electrical current through the water during the oxidation process. The partially treated water is then passed through ion-exchange columns to polish ammonium and other contaminants. The ion-exchange columns are cycled through regeneration cycles to provide continuous ion-exchange medium. The ammonium rich brine solution used in regeneration is subjected to an ammonium destruct process and then reused in regenerating ion-exchange columns. The water can then be sent through a final disinfection oxidation process to destroy or inactivate pathogens and / or remove any remaining colorants or odor to provide a water source suitable for almost any use.
Owner:NEW EARTH SYST

Chelating agent modified graphene oxides, methods of preparation and use

The invention is directed to chelating agent modified graphene oxides having the following formula G(AB)x; wherein G is graphene oxide, A is selected from the group consisting of —(CH2)m—, —NH—, —S—, —O—Si(—OR1)2(—CH2)m—, —C(═O)—, —C(═O)—O—, —C(═O)—O(CH2)m—, —C(═O)—NH—, —C(═O)—NH—(CH2)m—, —P(═O)2—O—, wherein m is 1-12 and R1 is H, or C1-C12 alkyl; and B is a chelating moiety; wherein the ratio of basic graphene oxide units:x is from about 1:0.00001 to about 1:0.5. Such chelating modified graphene oxides have broad applications in diverse technical fields.
Owner:JINING LEADERNANO TECH L L C

Carbon-coated metal oxide nanoparticles

Composites for destroying chemical and biological agents such as toxins and bacteria, and methods of preparing and using those composites are provided. According to the invention, the substance to be destroyed is contacted with the inventive composites which comprise finely divided metal oxide nanoparticles at least partially coated with carbon. Advantageously, the composites exclude water while not excluding the target compound or adsorbates. The desired metal oxide nanoparticles can be pressed into pellets for use when a powder is not feasible. Preferred metal oxide nanoparticles include MgO, SrO, BaO, CaO, TiO2, ZrO2, FeO, V2O3, V2O5, Mn2O3, Fe2O3, NiO, CuO, Al2O3, SiO2, ZnO, Ag2O, and mixtures thereof.
Owner:KANSAS STATE UNIV RES FOUND

Portable gas monitor

A portable monitor used to measure landfill gas and landfill well parameters. The portable monitor includes a control unit and a measuring unit that can communication wirelessly with one another. The control unit and / or measuring unit can includes a heating arrangement to increase the temperature of one or more components in the control unit and / or measuring unit in cold environments.
Owner:ELKINS EARTHWORKS

Application of metal-organic framework functional material

The invention discloses an application of a metal-organic framework functional material, and belongs to the technical field of water processing. A metal-organic framework material is subjected to pre-modification and post-modification, and a series of different functional groups are introduced to an organic ligand or an inorganic metal cluster of the material. The metal-organic framework functional material is used as an adsorbent for removing radioactive ions from nuclear waste. The metal-organic framework material containing sulfate radicals and sulfonate radicals has a preferable adsorption effect on 133Ba<2+>; the maximum removal rate can reach 99.9%; and adsorption equilibrium can be achieved in 5min. By using the functionalized metal-organic framework material, a simple, easy, efficient, and fast novel method is provided for removing 133Ba<2+> from the nuclear waste. The metal-organic framework functional material has significant industrial application value with respect to nuclear pollution management.
Owner:BEIJING UNIV OF CHEM TECH

Composite materials and techniques for neutron and gamma radiation shielding

This invention deals with multi-component composite materials and techniques for improved shielding of neutron and gamma radiation emitting from transuranic, high-level and low-level radioactive wastes. Selective naturally occurring mineral materials are utilized to formulate, in various proportions, multi-component composite materials. Such materials are enriched with atoms that provide a substantial cumulative absorptive capacity to absorb or shield neutron and gamma radiation of variable fluxes and energies. The use of naturally occurring minerals in synergistic combination with formulated modified cement grout matrix, polymer modified asphaltene and maltene grout matrix, and polymer modified polyurethane foam grout matrix provide the radiation shielding product. These grout matrices are used as carriers for the radiation shielding composite materials and offer desired engineering and thermal attributes for various radiation management applications.
Owner:SAYALA DASHARATHAM

Processes for water treatment

The invention provides compositions comprising bauxite refinery residues that have been reacted with sufficient calcium and magnesium ions that they have a reaction pH of less than 10.5, and one or more water treating additives. The invention also provides processes for treatment of water containing dissolved inorganic substances involving stepwise treatment of the water in which the reacted bauxite refinery residues are added after the addition of a pH-raising additive. The invention also provides processes for treatment of water containing dissolved inorganic substances in which the reacted bauxite refinery residues are added stepwise, with one or more water treating additives also being added in at least one of the steps. The invention also provides a process for the neutralisation of bauxite refinery residue by reacting it with a base amount and a treating amount of calcium ions and a base amount and a treating amount of magnesium ions for a time sufficient to produce an at least partially-neutralized residue exhibiting a reaction pH of less than 10.5.
Owner:NAUVEAU TECH INVESTMENTS

Acid zirconium phosphate and alkaline hydrous zirconium oxide materials for sorbent dialysis

A combination of acid zirconium phosphate and alkaline hydrous zirconium oxide are utilized as ion-exchange materials, for example, in sorbent dialysis. The combination provides for dialysate regeneration while maintaining constant and controlled levels of Na+, HCO3−, and pH.
Owner:FRESENIUS MEDICAL CARE HLDG INC

Zirconium phosphate and method of making same

InactiveUS6960328B2PhosphatesPhysical/chemical process catalysts31p nmr spectroscopyIon exchange
A zirconium phosphate compound having a Zr:P ratio of from about 1.80-2.0 to 1, which compound's H-form exhibits a single peak at −13.7±0.5 ppm in the 31P NMR spectra. The compound is useful as a catalyst, catalyst support and ion exchange media having a high affinity for cobalt and nickel ions.
Owner:MEL CHEM

Nuclear Assisted Hydrocarbon Production Method

A method is disclosed for the temporary or permanent storage of nuclear waste materials comprising the placing of waste materials into one or more repositories or boreholes constructed into an unconventional oil formation. The thermal flux of the waste materials fracture the formation, alters the chemical and / or physical properties of hydrocarbon material within the subterranean formation to allow removal of the altered material. A mixture of hydrocarbons, hydrogen, and / or other formation fluids are produced from the formation. The radioactivity of high-level radioactive waste affords proliferation resistance to plutonium placed in the periphery of the repository or the deepest portion of a borehole.
Owner:BAIRD JAMES RUSSELL

Techniques and compositions for shielding radioactive energy

Techniques and compositions are provided for shielding radioactive energy. The composition includes a hydrocarbon component and a radiation shielding and absorbing material or additive. The composition may be applied to substrates or to radioactive materials. Moreover, the composition may be mixed with raw materials of products.
Owner:TERRY INDS

Method for treating radioactive wastewater

The invention discloses a method for treating radioactive wastewater. The method for treating the radioactive wastewater comprises the steps of firstly carrying out reverse osmosis treatment on the radioactive wastewater, then enabling the radioactive wastewater to enter a continuous electrodeionization unit to be treated, and further removing radionuclide so as to enable treated wastewater to reach discharge requirements; and respectively filling different mixed ion exchange resin in a plain water chamber and a thick water chamber in a continuous electrodeionization membrane stack of the continuous electrodeionization unit, wherein mixed ion exchange resin filled in the plain water chamber comprises, by volume ratio, 30%-60% of strong-acid cation exchange resin, 40%-60% of strong-base anion exchange resin, and 0%-30% of weak-base anion exchange resin, mixed ion exchange resin filled in the thick water chamber comprises, by volume ratio, 20%-50% of strong-acid cation exchange resin, and the balance strong-base anion exchange resin. A weak dissociation polymer portion is used for improving selectivity of continuous electrodeionization membrane stack to trace amount radionuclide, radionuclide with extremely concentration can be effectively removed, and the method for treating the radioactive wastewater ensures that the final discharged water satisfies the discharge requirements.
Owner:BEIJING QINGHE CHAOHUA TECH CO LTD
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