73results 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.

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.

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 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).

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.

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.