Abstract: A cerium manganese catalyst for ozone decomposition, which is mainly a composite oxide of Mn2O3 and CeO2 with the chemical constitution of CeMnaOx, a being a natural number selected from 6 to 15. A method for preparing a catalyst comprises: mixing a solution containing a cerium source and a manganese source with excessive urea, reacting to obtain a precipitate, washing the precipitate to neutral, drying, and roasting to obtain the cerium manganese catalyst.

Abstract: A portable small water turbine with activated carbon water filter is described that has material available to conduct the removal of the ionic surfactants of polluted water from seas and rivers. The portable small water turbine is placed inside a mini boat that is remote controlled. The mini boat (similar to adult/kids RC toy boat) can be dropped-off and picked up from the sea or rivers by a drone. The activated carbon water filter tube contains carbon pads composed of mantle peridotite carbon mineralization based activated carbon.

Abstract: An improved contactor/separator process is presented where one or more stages of contact and separation is achieved by providing one or more shroud and disengagement device combinations within a vessel, where the disengagement device is connected to the top of the shroud that contains vertically hanging fibers. A liquid admixture of immiscible fluids is directed co-currently upward through the shroud at flooding velocity or greater, where all of the admixture exits the disengagement device through a coalescing material. Tray supports are used to stack additional shroud and disengagement combinations vertically within the vessel. Each tray allows less dense liquids exiting one disengagement device from a lower shroud and disengagement device combination to enter the bottom of a shroud of a shroud and disengagement device combination position vertically above the lower shroud and disengagement device combination.

Abstract: Disclosed is a method of predicting a sugar content and acidity of fruits that is capable of predicting a sugar content and acidity of ripe fruits before harvest using samples of unripe fruits. The predicted sugar content and acidity can be used as data for quality management of fruits, such as output control of fruits, before the fruits become fully ripe. In addition, the predicted sugar content and acidity can be used as data for selection of candidate seeds, so that efficiency of development of new varieties can be improved.

Abstract: An automated total organic carbon analyzer is described. Embodiments of the system include two features, namely the development of a selective oxidation reactor to oxidize organic contaminants to their corresponding organic acids, and the measurement of the organic acids individually by chain length using an electroanalytical detector. Combining this electroanalytical approach with sequential detection capabilities (such as spectrophotometry) can expand the instrument capabilities by providing organic contaminant speciation. The described reactor performs selective oxidation of organic carbon to organic acids followed by complexation with a proprietary ligand, then selective detection using electroanalytical accumulation and desorption of organic acids performed at an electrode surface.

Abstract: Various embodiments may include a system for removing contaminants from contaminated water comprising: a distillation still supplying heat to contaminated water to boil the contaminated water; a vent allowing a vapor stream to exit the distillation still; an oxidation unit removing additional contaminants from the vapor stream; an outlet discharging a purified water stream from the oxidation unit; and a heat exchanger transferring heat from the purified water stream leaving the oxidation unit to the vapor stream exiting the distillation still before the vapor stream enters the oxidation unit.

Abstract: An improved contactor/separator process is presented where one or more stages of contact and separation is achieved by providing one or more shroud and disengagement device combinations within a vessel, where the disengagement device is connected to the top of the shroud that contains vertically hanging fibers. A liquid admixture of immiscible fluids is directed co-currently upward through the shroud at flooding velocity or greater, where all of the admixture exits the disengagement device through a coalescing material. Tray supports are used to stack additional shroud and disengagement combinations vertically within the vessel. Each tray allows less dense liquids exiting one disengagement device from a lower shroud and disengagement device combination to enter the bottom of a shroud of a shroud and disengagement device combination position vertically above the lower shroud and disengagement device combination.

Abstract: Systems for water treatment may include an evaporation unit, wherein the evaporation unit may comprise: a first blower; a spacer, wherein the spacer may be fluidly coupled to the first blower; wherein the evaporation unit may be configured to aerate and evaporate water; and a drying tunnel, wherein the drying tunnel may comprise: a second blower, wherein the second blower may be fluidly coupled to an end of the drying tunnel; a heater coupled to an exterior surface of the drying tunnel; nozzles disposed between the heater and the second blower; and a chamber configured to collect solids; wherein the drying tunnel may be configured to evaporate water.

Abstract: Systems for water treatment may include a drying tunnel, wherein the drying tunnel may comprise: a blower, wherein the blower may be fluidly coupled to an end of the drying tunnel; a heater coupled to an exterior surface of the drying tunnel; nozzles disposed between the heater and the blower; and a chamber configured to collect solids; wherein the drying tunnel may be configured to evaporate water.

Abstract: The present disclosure relates to water purification. The teachings thereof may be embodied in processes for removing contaminants from contaminated water. An example process may include: boiling or evaporating a contaminated water to distill the contaminated water; removing a vapor stream from the boiling or evaporating contaminated water; delivering the vapor stream to an oxidation unit; removing additional contaminants from the vapor stream in the oxidation unit; and discharging a purified water stream from the oxidation unit.

Abstract: A waste liquid treatment device (20) treats water to be treated that contains at least hydrogen peroxide, by decomposing the hydrogen peroxide. The waste liquid treatment device (20) is equipped with a housing (21), an introduction port (22) that is provided to the housing (21) and that introduces the water to be treated into the housing (21), a discharge port (23) that is provided to the housing (21) and that discharges treated water to be obtained by treating the water to be treated, and one or more channel-defining members (24) that are disposed within the housing (21) and that have a surface that a catalyst is disposed on, wherein the one or more channel-defining members (24) define, between the introduction port (22) and the discharge port (23), a channel (P) for the water to be treated, the channel (P) having a turning in at least one position.

Abstract: The present invention relates to a field of control of nitrogen oxide pollution, and involves a high-efficient catalyst for denitration at low temperature and preparation method thereof, which comprises the steps: (1) preparing aqueous solution of cerium nitrate; (2) soaking mesoporous silica materials SBA-15 with aqueous solution from step (1), after stirring, filtrating, washing and drying; (3) calcining materials from step (2) to obtain evenly dispersed CeO2-SBA-15 materials; (4) preparing ethanol solution of manganese nitrate; (5) soaking CeO2-SBA-15 materials from step (3) with ethanol solution of manganese nitrate from step (4) and volatilizing ethanol, washing and drying; (6) calcining materials from step (5) to obtain evenly distributed MnxOy/CeO2-SBA-15 catalyst for denitration; The preparation method has simple process with lower cost, and the obtained MnxOy/CeO2-SBA-15 catalyst has uniform and ordered pores, large specific area, narrow pore size distribution, well dispersity of catalytic components

Abstract: The present invention is directed to a high surface area, high pore volume porous alumina, comprising: aluminum oxide, optionally, silicon oxide and aluminosilicates, and optionally one or more dopants, said alumina having a specific surface area of from about 100 to about 500 square meters per gram and a total pore volume after calcination at 900° C. for 2 hours of greater than or equal to 1.2 cubic centimeters per gram, wherein less than or equal to 15% of the total pore volume is contributed by pores having a diameter of less than 10 nm.

Abstract: A method for reducing sulfide in oilfield waste water includes contacting oilfield waste water with an oxidizer in the presence of an iron catalyst. The oilfield waste water includes sulfide that is oxidized to sulfate while avoiding formation of a colloidal or bulk sulfur precipitate. A method for recycling oilfield waste water includes contacting oilfield waste water with an oxidizer in the presence of an iron catalyst, the oilfield waste water comprising sulfide; oxidizing the sulfide to sulfate; avoiding formation of a colloidal sulfur precipitate, a bulk sulfur precipitate, or a combination comprising at least one of the foregoing; clarifying the oilfield waste water by contacting the oilfield waste water with a flocculant to form an aggregate precipitate; separating the aggregate precipitate from the oilfield waste water to form a recycled water; combining an additive with the recycled water; and disposing the recycled water in a downhole environment.

Abstract: A liquid purification system is provided. Although not limited to water, the purification system is especially suitable for water. The purification system utilizes a vessel having antimicrobial inner wall load bearing surfaces and/or antimicrobial (antibacterial, anti-fungal, anti-mold, etc.) interior non-load bearing surfaces. When the liquid moves within the vessel and contacts the antimicrobial surfaces, the liquid becomes purified or sanitized. The inner wall load bearing surfaces and non-load bearing interior surfaces of the vessel may be manufactured from a host polymer that has antimicrobial organo-metallic additives which form a solid-solution with the host polymer and are distributed homogeneously throughout the host polymer. The host polymer matrix may be an organic material, an inorganic material or an organic-inorganic material blend. The antimicrobial agent polymer matrix may be located in localized zones within the vessel.

Abstract: A liquid purification system is provided. Although not limited to water, the purification system is especially suitable for water. The purification system utilizes a vessel having antimicrobial inner wall load bearing surfaces and/or antimicrobial (antibacterial, anti-fungal, anti-mold, etc.) interior non-load bearing surfaces. When the liquid moves within the vessel and contacts the antimicrobial surfaces, the liquid becomes purified or sanitized. The inner wall load bearing surfaces and non-load bearing interior surfaces of the vessel may be manufactured from a host polymer that has antimicrobial organo-metallic additives which form a solid-solution with the host polymer and are distributed homogeneously throughout the host polymer. The host polymer matrix may be an organic material, an inorganic material or an organic-inorganic material blend. The antimicrobial agent polymer matrix may be located in localized zones within the vessel.

Abstract: A method for recovering hydrocarbons from an aqueous hydrocarbonaceous slurry comprises pumping a mixture of the slurry and an oxidizing agent through a conduit, wherein the conduit comprises a plurality of stationary interior projections defining a non-linear path through the conduit, and thereby agitating the mixture to release the hydrocarbons from the slurry; and separating the hydrocarbons from the slurry.

Abstract: A process has been developed to selectively dissociate target molecules into component products compositionally distinct from the target molecule, wherein the bonds of the target molecule do not reform because the components are no longer reactive with each other. Dissociation is affected by treating the target molecule with light at a frequency and intensity, alone or in combination with a catalyst in an amount effective to selectively break bonds within the target molecule. Dissociation does not result in re-association into the target molecule by the reverse process, and does not produce component products which have a change in oxidation number or state incorporated oxygen or other additives because the process does not proceed via a typical reduction-oxidation mechanism. This process can be used for the remediation of water, particularly ballast water.

Abstract: Continuous flow water treatment systems, devices and methods that reduce the costs associated with using oxidizing agents in water treatment by maximizing mixing energy with pressure of the solution in a continuous flow system. The systems comprise an inflow conduit that provides water to be treated to a mixing chamber in a housing, a first chemical injector mounted into either the inflow conduit or the housing that provides an oxidizing agent into the water flow, a driven impeller mounted within the mixing chamber that maintains the flow of fluid through the apparatus and provides agitation to the fluid within the mixing chamber, and an outflow conduit for expelling the treated water from the mixing chamber. The outflow conduit may be pressurized to increase the mixing energy in the mixing chamber.

Abstract: The present invention relates to a process for the catalytic oxidation of sulphide, mono- and/or dihydrogen sulphide, comprising the step of contacting the sulphide, mono- and/or dihydrogen sulphide in the presence of oxygen with a chelate complex comprising (i) a metal cation selected from the group consisting of Fez+, Mnz+, Niz+ and Coz+, where z=2 or 3, and (ii) a chelate ligand containing a porphyrin, a phthalocyanine or a porphyrazine ring coordinated to the metal cation, and at least one cationic substituent covalently attached to the ring in the chelate ligand.

Abstract: The present invention relates to a method for removing sulfur from a gaseous or liquid mixture. This method involves contacting the gaseous or liquid mixture with an iron-enriched matrix under conditions effective to remove sulfur from the mixture through adsorption of the sulfur to the matrix. The iron-enriched matrix used in this method is a lignocellulosic material that is enriched with iron. The present invention also relates to a system, composition, and plant fertilizer that contain the iron-enriched matrix. Methods of making the composition and preparing a plant fertilizer are also disclosed.

Abstract: A method and system treat contaminated water. In one embodiment, the method comprises treating contaminated water by introducing a methylmorpholine-N-oxide solution to a vessel. The vessel contains the contaminated water and iron oxide. The contaminated water comprises contaminants. In addition, the methylmorpholine-N-oxide solution comprises methylmorpholine-N-oxide and water. The method further comprises contacting the methylmorpholine-N-oxide solution with the contaminated water. In addition, the method comprises treating the contaminated water by allowing the methylmorpholine-N-oxide to react with the contaminants in the presence of the iron oxide.

Abstract: A novel composition for a photocatalyst Fe doped ZnO nano-particle photocatalyst that enables the decontamination process by degrading toxic organic material such as brilliant cresyl blue, indigo carmine and gentian blue by using solar light is described. In the current disclosure method of making a specific size of the nano photocatalyst is described. Characterization of the photocatalyst, optimal working conditions and efficient use of solar light has been described to show that this photocatalyst is unique. The process described to use the photocatalyst to degrade toxic organic material using the solar light to activate the photocatalyst is cost efficient and cheap to clean our water resources.

Abstract: Methods and systems for treating caustic materials are disclosed. In one exemplary embodiment, a method for treating caustic materials includes the steps of providing a first caustic solution stream including phenolic constituents and naphthenic constituents, mixing the first caustic solution stream with an acid solution, and separating phenolic acids from the first caustic solution stream. The method further includes further mixing the first caustic solution stream with additional acid solution and separating naphthenic acids from the first caustic solution stream. Still further, the method includes providing a second caustic solution stream including sulfidic constituents, mixing the first caustic solution stream with the second caustic solution stream to form a combined caustic solution stream, and oxidizing the sulfidic constituents of the combined caustic solution stream.

Abstract: A process which comprises providing a porous matrix, mixing said porous matrix with a precursor solution containing manganese and cerium ions dissolved therein, triggering the formation of a non-fluid phase which contains manganese and cerium in the interior of said porous matrix, separating said porous matrix from a liquid phase containing soluble metals, completing the formation of said non-fluid phase which contains manganese and cerium in the interior of said porous matrix, heat treating said porous matrix to convert said non-fluid phase containing manganese and cerium placed therein into a manganese oxide-cerium oxide composite, and isolating said composite from said porous matrix. The resulting composite, and its use as a catalyst, are also provided.

Abstract: The present invention relates to a device, particularly a nozzle, for treating waste water, said nozzle having an outer tube and an inner tube. An intermediate space is formed between the outer tube and the inner tube and said intermediate space between the outer tube and the inner tube is divided into at least two chambers in the longitudinal direction of the tubes. The inner tube tapers in the longitudinal direction and then widens again and has at least one opening into each chamber at the constricted area. On the inner side of the inner tube and/or in the interior thereof, the device preferably has a catalyst. The present invention further relates to a method for oxidising polluted waste water and a system for performing the method.

Abstract: A process for oxidizing a chemical contaminant selected from the group consisting of (i) aromatic compounds, (ii) unsaturated compounds having one or more of the following bonds: C?C, C?C, C?O and C?N, and (iii) amines, which process comprises combining the chemical contaminant and cuprous (Cu+) ions in an aqueous solution in a reaction vessel in an essentially oxygen-free environment, and subsequently feeding an oxidizer to said solution.

Abstract: The invention discloses an apparatus and method to uniformly disperse ozone gas bubbles into liquid phase water for the treatment thereof. The apparatus consists of a water inlet section connected with a section with structured packing or monolith having parallel flow channels. A portion of the influent water is withdrawn from the main water stream as a side stream, pressurized by a pump, mixed with ozone-containing gas, and then injected back into the main water flow. The side stream may be divided into multiple streams either before or after mixing with the ozone-containing gas, and then injected into the main flow section upstream of the packed section. In alternate embodiments, the ozone-containing gas can be injected directly through the gas diffusers just upstream of the packed section in order to achieve uniform concentration of gas and liquid in the fluid entering the monolith.

Abstract: A method of obtaining industrial water or drinking water from water that contains radioactive nuclides, in radium-containing groundwater including chemically pretreating the radioactive nuclide-containing water, and filtering the chemically pretreated water, wherein, in the chemical pretreatment, manganese dioxide is added to the water and/or manganese dioxide is generated in situ in the water and wherein filtration of the chemically pretreated water proceeds using at least one ceramic filter membrane.

Abstract: The invention relates to a water-using domestic appliance comprising a tub for accommodating articles to be cleaned and at least one interior surface containing a catalytically active substance, said catalytically active substance being a polyoxometalate and the interior surface being likely to come into contact with water during operation of the domestic appliance. The invention further relates to a method for operating said domestic appliance.

Abstract: A system and method for oxidation treatment of water in which ozone gas is dissolved in water by passing a mixed gas-liquid stream through a monolith at an elevated pressure that is close to the preferred gas output pressure for an ozone generator. The monolith is preferably contained at least partially within a gas-liquid separator vessel. Advanced oxidation is optionally provided by injecting hydrogen peroxide and/or embedding a catalyst on the monolith. At least a portion of the treated water is preferably recycled in order to increase total ozone dosing in the effluent stream.

Abstract: One exemplary embodiment can be a process for oxidizing sulfides. The process can include passing an alkaline stream having about 1-about 30%, by weight, of an alkaline material and one or more sulfide compounds to a reaction zone having a metal phthalocyanine catalyst.

Abstract: Raw water is made to pass through a raw water supply pipe by opening on-off valves, and by closing on-off valves. Oxygen is supplied to the raw water in the raw water supply pipe by opening an on-off valve of an oxygen supply pipe. The resulting raw water containing organic matter and oxygen passes through the raw water supply pipe and enters a catalyst-packed column, thereby contacting a platinum-group metal catalyst onto which hydrogen is adsorbed. This causes the organic matter in the raw water to contact the platinum-group metal catalyst under the presence of dissolved oxygen and hydrogen which is adsorbed onto the metal catalyst. Accordingly, the organic matter in the water to be treated can be easily removed at high efficiency and with low energy consumption.

Abstract: A method of treating wastewater containing peroxide and ammonia includes performing a first stage peroxide pretreatment of the wastewater with a catalyst, and performing a second stage ammonia separation of the peroxide treated wastewater by a distillation process, thereby producing a concentrated ammonium hydroxide end product that is separated from the wastewater.

Abstract: The present invention relates to a process for the catalytic oxidation of sulphide, mono- and/or dihydrogen sulphide, comprising the step of contacting the sulphide, mono- and/or dihydrogen sulphide in the presence of oxygen with a chelate complex comprising (i) a metal cation selected from the group consisting of Fez+, Mnz+, NiZ+ and Coz+, where z=2 or 3, and (ii) a chelate ligand containing a porphyrin, a phthalocyanine or a porphyrazine ring coordinated to the metal cation, and at least one cationic substituent covalently attached to the ring in the chelate ligand.

Abstract: Advanced oxidation process namely ozonation and Fenton's (hydrogen peroxide/Fe:2+) were utilized to degrade kinetic hydrate inhibitor (KHI). The oxidized solution after scavenging oxygen can be successfully disposed to the injection well. This facilitates use of KHI more frequently and in higher concentrations for future projects oil & gas operations. It also offers an alternative that competes efficiently with thermodynamic hydrate inhibitor (THI) or complements THI.

Abstract: A printing and dyeing wastewater treatment and reuse apparatus includes a coarse filter, a regulation pool, a hydraulic sieve, a desulfurization pool, a nanocatalytic electrolyzer, a flocculation pool, a flocculation tank, a settling pool, a flotation device, a biochemical pool, a secondary settling pool, a secondary nanocatalytic electrolyzer, a fine filter, a compressor, a nanomembrane assembly, and a recycling pool. Also provided is a printing and dyeing wastewater treatment and reuse method including steps of desulfurization, nanocatalytic electrolysis, flocculation, biochemical treatment, secondary catalytic electrolysis, filtration, and separation by membrane. The invention allows high CODCr removal rate, reduced chemical agent consumption, reduced sludge formation, thorough treatment, and high water reuse rate.

Abstract: A tanning wastewater treatment and reuse apparatus includes a coarse filter, a regulation pool, a hydraulic sieve, a desulfurization pool, a first nanocatalytic electrolyzer, a flocculation pool, a first settling pool, a flotation device, a biochemical pool, a second settling pool, a second nanocatalytic electrolyzer, a fine filter, and a compressor. Also provided is a tanning wastewater treatment and reuse method includes the steps of desulfurization, first nanocatalytic electrolysis, flocculation, biochemical treatment, second catalytic electrolysis, and filtration. The invention allows high CODCr removal rate, reduced chemical agent consumption, reduced sludge formation, thorough treatment, and high water reuse rate.

Abstract: Toxic organic materials contaminate water resources and one need to find an easy and energy efficient way to decontaminate water resources. The current invention discloses a photocatalyst Fe doped ZnO nano-particle photocatalyst that enables the decontamination process by degrading toxic organic material such as brilliant cresyl blue, indigo carmine and gentian blue by using solar light. In the current disclosure many examples of characterization of the photocatalyst, optimal working conditions and efficient use of solar light has been described. The process described to use the photocatalyst to degrade toxic organic material using the solar light to activate the photocatalyst is cost efficient and cheap to clean our water resources.

Abstract: A method of treating water in order to minimize scaling and biomass buildup in water conduits or containers in which the treated water is used includes pressurizing and optionally filtering ambient air, processing the pressurized ambient air in a chamber including at least one ultraviolet light source operated to generate an output flow mixture of pressurized air and reactive oxygen species (ROS) gas, mixing the pressurized ROS/gas output mixture to realize a flow of water/pressurized ROS gas/air mixture and outputting the flow of water/pressurized ROS gas/air mixture as the treated water process product. The process includes generating reactive oxygen species (ROS) gas in the pressurized ROS/gas output mixture including at least one of Super Oxide (O2?), Peroxide (—O2—), Hydro peroxide (HO2?), Hydroxyl Radicals (OH.), Ozone (O3?) and Molecular Oxygen (O2).

Abstract: Compositions and methods for oxidizing contaminants present in environmental media. The compositions include a mixture of persulfate salts and borate salts to activate the persulfate's oxidation of contaminants.

Abstract: This invention relates to a refuse landfill leachate wastewater treatment system comprising a collection well, an adjustment tank, a filter, a comprehensive treatment system having a multi-stage anoxic/aerobic pool and a membrane biological reactor.

Abstract: To develop a Fenton reaction catalyst that can maintain divalent iron stably for a long period of time, can utilize trivalent iron or metallic iron, which is an inexpensive iron-supplying source, by converting into divalent iron, and is harmless to the human body and the environment, provided is a Fenton reaction catalyst, including, as an active component, a reaction product obtained by mixing a specific reducing organic substance (e.g., ascorbic acid, a polyphenol-containing plant component, or a plant dry distillation liquid component) with an iron-supplying source at a predetermined ratio in the presence of water. Also provided are a sterilization method, a pollutant degradation method, and a luminescence method based on chemiluminescence, which involve using the Fenton reaction catalyst.

Abstract: In an improved fiber-film type contactor/separator an enhanced coalescing zone is provided by the presence of a disengagement device connected to a shroud that contains a bundle of high surface area vertical hanging fibers, where the enhanced coalescing zone diverts a portion of an admixture of immiscible liquids to flow radially in a path not parallel to the vertical axis of the hanging fibers whereby the diverted portion of liquids contacts a coalescing surface to cause at least one of the liquids to coalesce into droplets. The immiscible liquids are allowed to settle into separate phase layers and first and second outlets selectively remove the higher density liquid from the lower density liquid.

Abstract: The present invention provides an apparatus for producing photocatalytic reaction water through a photocatalytic reaction, which can produce water containing a satisfactory amount of active oxygen species, can eliminate microorganisms, parasites or protozoa, shows high oxidizing ability for a prolonged period of time, can reduce the power requirements, is small in size, and is applicable to various devices. A photocatalyst is radiated with light emitted from a light source to produce active oxygen species, and the active oxygen species is diffused in water, whereby the water is provided with functions of the active oxygen species. An oxidation reaction with the water is utilized to perform at least one selected from the elimination of microorganisms, the elimination of parasites, and the elimination of protozoa.

Abstract: A system and method for the treatment of process streams. A catalyst mediates a wet oxidation process at elevated temperatures and pressures for treating at least one undesirable constituent in an aqueous mixture. The aqueous mixture may be contacted with a catalyst and an oxidizing agent at an elevated temperature and a superatmospheric pressure.

Abstract: A system and method for the treatment of process streams is provided. A catalyst mediates a wet oxidation process at elevated temperatures and pressures for treating at least one undesirable constituent in an aqueous mixture. A catalyst may be selected for its solubility at a detected pH level of the aqueous mixture. Alternatively, a pH level of the aqueous mixture may be adjusted to solubilize a selected catalyst and/or maintain the selected catalyst in a soluble form. A controller in communication with a pH sensor may be configured to generate a control signal to adjust the pH level of the aqueous mixture in response to the pH sensor registering a pH level outside a predetermined pH solubility range for a selected catalyst.

Abstract: A method of forming a photocatalyst device includes depositing a layer of UV photocatalyst and depositing islands of a sequestering agent on a surface of the layer of the UV photocatalyst.

Abstract: In production of ultrapure water by purifying primary pure water with a secondary pure water manufacturing apparatus and a tertiary pure water manufacturing apparatus, high-purity ultrapure water is produced, wherein generation of hydrogen peroxide is minimized and the concentrations of TOC, DO, and hydrogen peroxide are reduced to the limit. In an ultrapure water manufacturing system, each of the secondary pure water manufacturing apparatus and the tertiary pure water manufacturing apparatus includes an ultraviolet oxidation device and a deionization device, downstream therefrom, by using an ion exchange resin. UV light control is performed in such a way that the hydrogen peroxide concentration results in 1 to 30 ?g/L and the TOC concentration results in 1 to 10 ?g/L at the outlet of the ultraviolet oxidation apparatus of the secondary pure water manufacturing apparatus and, in addition, the TOC concentration results in 0.

Abstract: A system and method for the treatment of process streams. A catalyst mediates a wet oxidation process at elevated temperatures and pressures for treating at least one undesirable constituent in an aqueous mixture. A catalyst may be selected for its solubility at a detected pH level of the aqueous mixture. Alternatively, a pH level of the aqueous mixture may be adjusted to solubilize a selected catalyst and/or maintain the selected catalyst in a soluble form. A controller in communication with a pH sensor may be configured to generate a control signal to adjust the pH level of the aqueous mixture in response to the pH sensor registering a pH level outside a predetermined pH solubility range for a selected catalyst.