71results about "Electric regeneration" patented technology

The invention discloses an electrodeionization (EDI) method and system dispensing with ion exchange membranes. The system is characterized in that porous water distribution plates, top electrodes, ion exchange resins, bottom electrodes and porous floating blocks with density less than that of water are placed in an insulating cavity from top to bottom in sequence; a top cover and the upper ends of cylindrical shells are sealed by upper seal rings; a bottom cover and the lower ends of the cylindrical shells are sealed by lower seal rings; the porous water distribution plates and the top electrodes are fixed between the top cover and the end faces of the cylindrical shells; the bottom electrodes are fixed on the porous floating blocks; intermediate seal rings are installed between the porous floating blocks and the cylindrical shells; and the top and bottom electrodes are respectively connected with a high-voltage direct current power supply. The method and the system have the following beneficial effect: the problems of membrane pollution, concentration polarization, scaling, hydroxide precipitates formed on the membrane surfaces when the heavy metal wastewater containing Cu<2+>, Ni<2+> and other ions are treated because the ion exchange membranes are adopted for EDI are solved. The method and the system are suitable for preparation of highly pure water, purification of electroplating rinse wastewater containing heavy metal ions and treatment of water and wastewater aiming at removing the ionic impurities.

An ion is eluted from an ion exchange resin in a separation system using an eluent generated by electrolysis of a medium. Elution is further assisted by an electrical field between two electrodes, wherein the ion exchange resin is at least partially disposed between the electrodes. Particularly preferred aspects of such separation systems include gradient separation (Membrane Dynamically Scanned Electrophoresis—MDSE) and buffered electrodialysis (Dynamically Buffered Electrodialysis—DBE).

Semiconductor-oxide nanotubes-based composite particles are useful for dye-removal. A method involves an ion-exchange mechanism operating under a dark-condition in an aqueous solution, for the processing of products consisting of the nanotubes of semiconductor-oxides deposited on, anchored to or attached to the surface of fly ash particles and metal-oxide (magnetic and non-magnetic) nanoparticles. The resulting micro-nano and nano-nano integrated composite particles can be used in the removal of an organic synthetic-dye from an aqueous solution and industry effluent via a surface-adsorption process, involving ion-exchange and electrostatic-attraction mechanisms. The composite particles can be recycled for the next cycle of dye-adsorption by decomposing the previously adsorbed dye on their surfaces via the use of either noble-metal-deposited or magnetically separable magnetic photocatalysts and exposure to ultraviolet (UV) or solar-radiation.

A performance-lowered ion exchanger hard to recover in performance by the conventional regeneration (ion exchange resin, ion exchange membrane, or the like) is endowed with the same electric charge as the electric charge of the ion exchanger. A performance-lowered ion exchanger hard to recover in performance by the conventional regeneration owing to adsorption thereon of a charged substance is endowed with an electric charge opposite to that of the charged substance. According to the foregoing operations, the ion exchangers are recovered in performance. At least one compound selected from among organic amine compounds and organic ammonium compounds, which are capable of being endowed with an electric charge through dissociation thereof in solution, is preferably used as a rejuvenation agent for an anion exchanger.

An object of the present invention is to provide an optical measurement apparatus equipped with an ion-exchange resin for pretreating a sample, thereby enabling the concentration of component in the sample to be measured with higher accuracy. The optical measurement apparatus of the present invention includes, in addition to the ion-exchange resin, an optical measurement section for measuring, based on the optical characteristics of the component, the concentration of the component in the sample after the sample is passed through the ion-exchange resin.

The invention discloses a countercurrent operated plate frame type electric regenerating device for inactive ion exchange resin. The device comprises a membrane stack, electrode devices and a clamping device. The membrane stack consists of a plurality of groups of membrane pairs; each group of membrane pairs comprises a cation-exchange membrane, a resin regeneration chamber partition board, an anion-exchange membrane and a thick water chamber partition board; and two sides of the membrane stack are provided with the electrode devices, and the membrane stack and the electrode devices are compacted by using the clamping device on the exterior so as to assemble the plate frame type electric regenerating device for the ion exchange resin. Water flows of a resin regeneration chamber and a thick water chamber in the device can run stably for long term in a countercurrent operation mode, so the resin regeneration effect is good; and meanwhile, the device does not consume acid or alkali chemical agents during running, does not discharge waste liquid and waste water, and only consumes a little electric energy, so the device has the advantages of low energy consumption, simple operation andconvenient use and can be widely applied to inactive regeneration of various mixed-bed resin, polished resin, softened resin and positive and negative resin.

The invention relates to an apparatus for electrically regenerating mixed bed ion exchange resin through a bipolar membrane method. The apparatus is composed of a bipolar membrane acid and alkali producer, a liquid storage device and a resin regenerator, wherein the bipolar membrane acid and alkali producer has a plate frame shape, and is composed of a plurality of groups of membranes, each group of the membranes is composed of a cationic membrane, an anionic membrane and a bipolar membrane, and two ends of the bipolar membrane acid and alkali producer are provided with electrodes and end plates respectively, are fixed by a plurality of bolts and are compacted to form an integral body; the liquid storage device is composed of a diluted acid regenerated liquid tank, a diluted alkali regenerated liquid tank, a diluted brine tank and an electrode water tank; and the regeneration modes of the resin regenerator comprise an internal regeneration mode and an external regeneration mode. In the invention, traditional technologies using an acid and alkali regeneration mixed bed are improved, an acid and alkali storage and transportation link is canceled, and a precedent for preparing diluted acid and alkali regenerated liquid regenerated mixed bed resin through dissociating water by using the bipolar membrane method under the action of a direct current field is set, so the mixed resin is thoroughly regenerated, and the regeneration cost is reduced; and no wastes are basically discharged from the regeneration apparatus, so the environment is protected, and the safety level is improved.

A original position electricity regeneration process of adsorbing resin, it wraps the adsorbing resin with cylinder-shaped ion exchange membrane, the adsorbing resin is equipped with anodic in itself and the outer of ion exchange membrane is installed cathode, the two sides of adsorbing resin bed layer are equipped with pore plate to prevent resin leak; after the adsorption of adsorbing resin reaches saturation, the adsorbing resin bed layer is injected with anodic regeneration liquid and the outer of ion exchange membrane is injected with cathode recycle liquid, then the anode and cathode is connected with DC, the organic pollutants absorbed by adsorbing resin is dissociated to make adsorbing resin regenerate and recovery adsorption capacity. The original position electricity regeneration process of adsorbing resin in the invention does not consume and treat the resin regeneration eluent of acid, alkali or organic solvents, reduces the regeneration costs of adsorption resin greatly and simplifies the regeneration process.

A softening apparatus including an ion exchanger that is repeatedly regenerated using electrolyzed hydrogen ions (H⁺). The softening apparatus includes a regeneration unit configured to produce regeneration water including hydrogen ions (H⁺) by electrolyzing water, a softening unit including an ion exchanger regenerated by receiving the regeneration water and configured to convert raw water including hardness components into soft water, and a controller configured to control the regeneration unit to produce regeneration water having a pH of 2 to 4. The ion exchanger has a Si/Al ratio of 1 to 5 and includes an inner pore with a diameter greater than 4 nm.

An ion is eluted from an ion exchange resin (132) in a separation system (100) using an eluent generated by electrolysis of a medium. Elution is further assisted by an electrical field between two electrodes (120, 110), wherein the ion exchange resin (132) is at least partially disposed between the electrodes. Particularly preferred aspects of such separation systems include gradient separation and buffered electrodialysis.

The invention provides a membrane-free ion exchange resin electric regeneration device based on a filter element electrode. The membrane-free ion exchange resin electric regeneration device comprisesa cylindrical shell; a supporting layer, which is arranged on the inner side of the shell and is integrated with the shell through casting; filter cloth; a net-shaped cathode, wherein the filter clothand the net-shaped cathode are tightly attached to the inner side of the supporting layer in sequence; and a filter element anode, which extends into the shell from a cover plate above the shell along the central axis direction of the shell. The filter element anode is fixedly connected to a bottom plate above the shell through a fixing flange; an ion exchange resin bed layer is tightly filled inthe shell; the filter element anode is connected with the anode of a DC power supply, and the net-shaped cathode is connected with the cathode of the DC power supply. The device is simple in structure and easy to operate, and meanwhile, the problem of hydraulic bias caused by structural difference of multiple groups of filter element electrodes is avoided.

The invention discloses a preparation method for a copper ferricyanide/multi-walled carbon nanotube hybrid material with a dendritic core-shell structure and an application of the material in selective adsorption of cesium ions. The method comprises the following steps: multi-walled carbon nanotubes are dispersed into a deionized water solution containing polyvinylpyrrolidone, the pH of the systemis adjusted to 1-7 by using hydrochloric acid, then copper ions and hexacyanoferrate ions are added into the above solution in batches, uniform mixing is performed under stirring, the mixed liquid istransferred into a hydrothermal reaction kettle, a hydrothermal reaction is performed for 1-24h at the temperature of 100-200 DEG C, then cooling is performed to room temperature, the reaction is stopped, centrifugation collection is performed, washing is performed with water and ethanol, and therefore the copper ferricyanide/multi-walled carbon nanotube hybrid material with the dendritic core-shell structure is obtained. Besides the very high selectivity and removal performance on cesium ions, the copper ferricyanide/multi-walled carbon nanotube hybrid material adsorbing the cerium ions canbe regenerated and shows very high stability in the treatment process of the cerium ions.

The object of the present invention is a method for recirculating a reprocessing effluent comprising chloride ions from an ion exchange resin comprising the following steps:

• • (ii) selecting fractions A, B, and optionally B′, directly stemming from a reprocessing effluent comprising chloride ions or after one or several steps for modifying the chloride ion concentration, having concentrations of chloride ions (g/l) of respectively (a), (b) and (b′)>0 g/l, with (a)>(b);
  • (iii) transferring by electrodialysis the chloride ions from the fraction B to fraction A for obtaining a fraction C having a chloride ion concentration (c) greater than (a); or
  • (iv) transferring by electrodialysis the chloride ions from fraction B to fraction B′, in order to obtain a fraction B″ having a concentration of chloride ions (b″) greater than (b′) and then mixing the fractions B″ and A in order to obtain a fraction C having a chloride ion concentration (c) greater than (a).

A multichannel intelligent cation exchange system comprises a plurality of electrical regeneration units which are connected in parallel and are provided with water inlets and loaded with strong-acid cation exchange resin, 5 to 1000mA of working current is applied to each electrical regeneration unit, and H<+> is generated through electrolysis of water, effluent of each electrical regeneration unit is respectively connected with a corresponding electrical conductivity detector, water samples containing the H<+> pass through the electrical conductivity detectors and return to the corresponding electrical regeneration unit to regenerate the strong-acid cation exchange resin in the electrical regeneration units. An electrochemical method for continuously and automatically regenerating the cation exchange resin is used for measuring the hydrogen conductivity in water vapour of a power station. A plurality of channels are designed, so that a plurality of different water samples can be processed simultaneously, and cations in the water are thoroughly converted into the H<+> without needing any chemical reagents; the multichannel intelligent cation exchange system can be applied to measuring the hydrogen conductivity in the water vapour on line, is energy-saving and environment-friendly, stable in performance and convenient in operation.

The invention relates to a method for electrically regenerating an H type cation bed failure cation exchange resin through a bipolar membrane method, wherein the method comprises: dilute salt water preparing, dilute acid regeneration liquid preparing, back flushing, regeneration and washing, and the mass percentage concentration of the dilute acid regeneration liquid used in the regeneration of the H type cation bed failure cation exchange resin is less than or equal to 8%. According to the present invention, the process for preparing the acid liquid for the H type cation bed failure cation exchange resin regenerating from the salt water by the bipolar membrane electrodialyzer according to the water dissociation effect under the action of the direct current electric field is provided, andcan replace the traditional process for chemically regenerating the H type cation bed failure cation exchange resin by purchasing the acid liquid, such that the regeneration level of the H type cationbed failure cation exchange resin is improved, the storage and transportation link of the regenerated acid liquid is eliminated, the regeneration operation of the H type cation bed failure cation exchange resin is convenient, the safety level is improved, and the environment is friendly.

The invention discloses a grafted quaternary ammonium cation resin and a preparation method thereof. The preparation method comprises the following steps: sequentially adding chloromethylated crosslinked polystyrene resin, trimethylamine hydrochloride and a 20% sodium hydroxide aqueous solution into a reactor in parts by weight, keeping the temperature of the reactor at 30-40 DEG C, reacting for 3hours while stirring, filtering, washing, and drying to obtain quaternary ammonium group introduced resin; and sequentially adding the resin, 1,2-dichloroethane and silver sulfate into a reactor, heating to 50-60 DEG C, adding concentrated sulfuric acid and fuming sulfuric acid, reacting for 1 hour, heating to 70-80 DEG C, reacting for 1 hour, heating to 115-125 DEG C, reacting for 5 hours, cooling to room temperature, diluting the obtained reaction solution, filtering, washing, and drying to obtain the grafted quaternary ammonium cation resin. The resin obtained by the invention has good electric regeneration performance, and can be used for preparing high-purity water and treating heavy metal wastewater in a membrane-free electrodeionization technology.

Electrodeionization methods and apparatus wherein ion exchange membranes are not utilized. Instead, ion exchange materials such as beads, fibers, etc., are disposed in alternating layers of anion exchange (AIX) materials and cation exchange (CIX) materials between opposite polarity electrodes. In a regeneration stage, a current is applied across the electrodes with water splitting occurring along at least one of the interfacial areas between neighboring AIX and CIX materials. The H⁺ and OH⁻ ions formed via water splitting migrate in response to the electrical current and displace the salt ions in the respective AIX and CIX. The stack is flushed during the regeneration stage to remove the concentrated salt solution. During a deionization phase, the electrical current is terminated with influent fed to the stack for deionization. The salt ions in the influent are depleted via ion exchange as the influent contacts the AIX and CIX.

Device (2) for the removal of ions from a polar liquid (F), e.g. water, comprising at least one compartment (14') which comprises at least one inlet for an entering polar liquid flow and at least one outlet for an outgoing deionized liquid flow (D), in which said compartment (14') an electrochemically regenerable ion-exchange material fills a zone through which zone a liquid flow is able to pass, the device (2) being characterized in that it comprises one sensor (1) of at least one dimensional change of the ion-exchange material. The sensor can comprise a photo-sensor or a sensor of mechanical stress. Preferably an apparatus (100, 10, 11) connected to the sensor is able to analyze this dimensional change and to control the electric current. Method of using said device (2), whereby the electrical current applied to the device (2) is controlled according to the expansion of the resin.

The invention relates to a waste ion exchange resin treatment method, which comprises: S1, mixing waste ion exchange resin, a catalyst and water, and stirring; S2, under normal pressure, heating to 50-100 DEG C, and gradually adding an oxidant until the waste ion exchange resin is completely dissolved; S3, subjecting the solution to electrolytic oxidation treatment for a certain period of time under the constant current and voltage; and step S4, adding an alkali into the solution to adjust the pH value to 7 to solidify and remove ions in the water. Using the above method, the method solid waste ion exchange resin is oxidized and dissolved through hydrogen peroxide, and then deep oxidation treatment is performed on the solution through electrolytic oxidation so as to form the novel waste ion exchange resin treatment method. A large amount of oxidizing agents do not need to be added, the treatment cost is reduced, harmful gas and waste cannot be generated in the treatment process, secondary pollution cannot be caused, the treated water quality is simple, and the COD value is low.