101 results about "Concentration polarization" patented technology

The invention relates to the technical field of water treatment, in particular to a high-recovery-rate short-process salt-tolerant reverse osmosis system and treatment method.The system comprises a pretreatment unit, a sensor monitoring unit, a self-adaptive pressure-flow coupling control unit, an intelligent operation and maintenance unit and a gradient boosting reverse osmosis membrane set. According to the invention, ultrahigh recovery rate and desalination performance are realized, gradient boost membrane module design is combined with concentration polarization inhibition technology, membrane surface flow state distribution is optimized, osmotic pressure influence is significantly reduced, pressure-flow coupling control and concentrated water excess pressure energy recovery technology are integrated, energy dynamic cyclic utilization is realized, energy consumption is reduced, and the method is suitable for industrial production. By monitoring the membrane flux attenuation rate and the transmembrane pressure difference in real time and dynamically optimizing a pulse cleaning strategy, dynamic optimization of high-salinity wastewater treatment is realized, and the problems of low recovery rate, high energy consumption and quick membrane pollution in high-salinity wastewater treatment are solved.

The invention relates to the technical field of membrane separation, in particular to a composite forward osmosis membrane based on mussel bionic interface enhancement and a preparation method thereof. The preparation method comprises the following steps: immersing a base material in a dopamine hydrochloride solution for oscillation reaction to obtain a modified base material; the surface of the modified base material is coated with a membrane casting solution in a blade coating mode, then phase inversion is carried out, the residual solvent is removed, then airing is carried out, and the composite forward osmosis membrane based on mussel bionic interface enhancement is obtained. By introducing the mussel bionic polydopamine intermediate layer, the long-standing technical contradictions of poor interfacial compatibility and weak binding force between the hydrophobic substrate and the hydrophilic separation layer are ingeniously solved, and the internal concentration polarization effect is remarkably inhibited. The prepared composite membrane has the advantages of high water flux, low salt reverse flux, stable structure and the like, and has wide application prospects in the fields of water treatment and substance separation.

The invention discloses a reverse osmosis membrane concentration polarization layer thickness prediction method and device based on electrical impedance tomography, and relates to the technical field of membrane process nondestructive monitoring, and the method comprises the following steps: constructing a simulation model based on an electrode array membrane filtration sensor; virtual media with different conductivities are arranged on the surface of the membrane, a simulation conductivity image is reconstructed through a conjugate gradient least square algorithm and a sensitivity matrix, and a neural network is improved through known conductivity training; and reconstructing an actually measured conductivity image by an actually measured boundary voltage data set, predicting a membrane surface conductivity estimated value by using the trained improved neural network, and performing concentration polarization layer thickness mapping. A conductivity image with a conductivity label is generated through numerical simulation, so that the problem that the thickness of the concentration polarization layer is difficult to calibrate is solved, then a neural network is improved through training so that the truth value of the conductivity can be predicted according to the conductivity image, and interpretable mapping of the thickness of the concentration polarization layer is carried out in combination with a membrane mass transfer theory. The thickness of the concentration polarization layer can be subjected to online lossless quantitative detection.

The utility model discloses a device for enhancing ion membrane-passing mass transfer based on full-channel flow electrode capacitive deionization, which comprises solution chambers, a cathode flow electrode chamber and an anode flow electrode chamber, the solution chambers comprise a first solution chamber and a second solution chamber, and an anion exchange membrane is arranged between the solution chambers. The two solution chambers are respectively provided with a guide plate, and each guide plate comprises a high-conductivity saline-water mixed solution channel. And the water flow directions of the two solution chambers are opposite. The first solution chamber and the second solution chamber contain high-conductivity saline mixed liquid which is formed by mixing pretreated seawater and a high-conductivity material. According to the FCDI device and the seawater desalination system, the middle solution chamber is additionally arranged, high-conductivity materials are added into the middle solution chamber, a flow guide channel of the middle solution chamber and mixed solution convection of different solution chambers are designed, and the phenomena of high resistance and membrane-liquid interface concentration polarization of the FCDI device system are solved; the desalting efficiency and the energy consumption performance are enhanced; the operation cost is reduced.

The invention relates to the technical field of fuel cell state evaluation, in particular to a fuel cell health state estimation method and system, and the method comprises the steps: continuously collecting the monomer polarization curve, pile AC impedance spectrum and gas flow channel pressure pulsation time sequence data of a target fuel cell in multiple operation cycles; ohm, activation and concentration polarization component decomposition are carried out on the polarization curve, a corresponding voltage loss component is extracted, correlation matching calculation is carried out on the corresponding voltage loss component and an impedance spectrum, and a polarization loss-impedance characteristic mapping relation is constructed. And extracting a pressure fluctuation mode synchronous with the polarization curve time sequence, and identifying an extra concentration difference loss component caused by the gas diffusion barrier by correlating the concentration difference polarization loss voltage. And integrating the component, the mapping relation and a reference aging model to calculate a comprehensive health state index. The multi-aging superposition state of the membrane electrode, the proton exchange membrane and the gas diffusion layer can be accurately reflected, aging inducement distinguishing is refined, and the accuracy of health state characterization is improved.

The application discloses a multi-target scheduling method of a photovoltaic energy storage hybrid device and relates to the technical field of new energy energy storage. The method comprises the following steps: monitoring the irradiance fluctuation characteristics of a photovoltaic power generation area in real time to lock the fluctuation risk; in response to a risk trigger signal, calculating the internal concentration polarization voltage of a battery in real time and quantifying the polarization approximation degree; based on the polarization approximation degree, using a gradual barrier model with nonlinear growth characteristics to calculate the length of the forced static period; and finally generating a pulse power instruction sequence composed of working pulses and forced static periods alternately. The application inserts a physical static time window when the micro electrochemical boundary approaches a critical point, uses the spontaneous diffusion of ions to eliminate accumulated concentration polarization, thereby meeting the rigid power support demand of the power grid while avoiding triggering the overvoltage protection of the battery, and realizing high-fidelity execution of the scheduling instruction.

The invention discloses a polypeptide refining treatment device for cosmetics, and relates to the technical field of polypeptide preparation, the polypeptide refining treatment device comprises a device body, the top and the bottom of the device body are communicated with a feeding port and a discharging port respectively, and a screen, a ceramic membrane and an ultrafiltration membrane are sequentially arranged in the device body in the direction from the feeding port to the discharging port; the top of the device body is detachably connected with a cover plate, and the cover plate is provided with a vibration assembly for driving the ceramic membrane to vibrate. The ceramic membrane is vibrated through the vibration assembly, the ceramic membrane can be effectively prevented from being blocked, the filtering efficiency and flux are guaranteed, the service life of the ceramic membrane is prolonged, meanwhile, vibration can cause forced convection of supernate, the concentration polarization phenomenon is reduced, adsorption and deposition of polypeptide molecules on the surfaces of membrane holes can be reduced, and the probability that the membrane holes are blocked is reduced; attachments on the surfaces of the membrane holes can be cleared away in time, the membrane holes are kept unblocked, and the screening efficiency is guaranteed.

The utility model relates to a membrane structure and a water purification device, and relates to the technical field of water purification treatment. The diaphragm structure comprises a diaphragm group and at least one separator, the diaphragm group comprises at least two layers of diaphragm bodies, the at least two layers of diaphragm bodies are sequentially stacked, and the front surfaces of the two adjacent layers of diaphragm bodies are oppositely arranged to form a water inlet runner; the membrane body is provided with a first side and a second side which are oppositely arranged in a first direction, the first side is provided with a raw water inlet communicated with the water inlet flow channel, and the second side is provided with a concentrated water outlet communicated with the water inlet flow channel; at least one separator is arranged in the water inlet flow channel, and the separator is configured to be capable of separating the water inlet flow channel so as to improve the flow speed of fluid in the water inlet flow channel. According to the technical scheme disclosed by the utility model, the membrane surface concentration polarization layer phenomenon can be weakened, the anti-pollution capability of the membrane structure is improved, and the service life of the membrane structure is prolonged.

The application discloses an electro-catalytic oxidation system and method and an ecological joint treatment method for in-situ remediation of water body sediments, which utilizes an intelligent pulse power controller to perform intermittent pulse electro-catalytic oxidation on the bottom mud at the water bottom, generates hydroxyl radicals through in-situ catalysis of an anode to degrade organic pollutants of the bottom mud, generates micro-bubbles in the interstices of the bottom mud through the electrolysis of water to improve the oxidation-reduction potential, and further reserves time for the soluble pollutants in the interstitial water of the bottom mud to sufficiently diffuse to the surface of the electrode, so as to avoid energy waste caused by concentration polarization. Through reverse power supply, the polarity of the anode and the cathode is instantaneously reversed, trace amounts of acidic substances and gas generated through in-situ electrolysis are utilized to strip off the calcium and magnesium scale attached to the surface of the cathode, and manual cleaning and maintenance under water are realized. In combination with the planting of submerged plants on the treated bottom mud, ecological joint treatment is realized, the root system of the submerged plants is utilized to perform long-term ecological fixation and water purification on the treated sediments.

The invention relates to an electrode, a plate frame and a flow battery, a flow area is formed on the surface of the electrode, the electrode comprises two first side edges which are oppositely arranged and two second side edges which are oppositely arranged and are respectively connected between the two first side edges, a main liquid inlet and a main liquid outlet which are communicated with the liquid flow area are formed in the middles of the two second side edges respectively, an auxiliary liquid inlet and an auxiliary liquid outlet which are communicated with the liquid flow area are formed in the two sides of the two second side edges respectively, and at least one second side edge is constructed to be an outwards-protruding arc edge; the distance between the main liquid inlet and the main liquid outlet is larger than the distance between the auxiliary liquid inlet and the auxiliary liquid outlet. According to the technical scheme, the electrode provided by the invention can improve the distribution uniformity of the electrolyte, so that the concentration polarization is reduced.

The invention provides an efficient electrolysis system based on anode bagging. The efficient electrolysis system comprises an electrolytic bath, an anode frame, a cathode frame and a diaphragm bag. The anode frame sleeves the outer side of the anode plate, and the diaphragm bag isolates the anolyte from the catholyte to form a liquid level difference. A catholyte injection device is arranged at the bottom of the cathode frame, and parallel flow injection of catholyte is achieved. The design that the anode is bagged and the cathode is not bagged is adopted, the bag sticking phenomenon is reduced, the quality and grade rate of electrodeposited nickel are improved, and the electrolysis efficiency is improved by about 40%. The anode frame and the cathode frame are integrally formed by injection molding, so that the structural strength is enhanced, and the cost is reduced. An acid mist collecting chamber is arranged at the top of the diaphragm bag and is matched with an acid mist suction device, so that acid mist is effectively treated, and the working environment is improved. And the concentration polarization is eliminated by parallel flow injection of the catholyte, and the electrolysis efficiency is improved. The method has the remarkable advantages of improving the electrolysis efficiency, reducing the cost, improving the environment and enhancing the system stability.

The invention discloses an electrodialysis device for extracting lithium from salt lake brine, the electrodialysis device comprises a cation exchange membrane, an electrodialysis partition plate and an anion exchange membrane, the electrodialysis partition plate comprises a fixed frame and a block net, and the block net comprises a plurality of wavy hollow pipelines which are arranged in a cavity hole and are arranged at intervals in a criss-cross manner; a through hole is formed in the side wall of the hollow pipeline and is used for enabling brine to act on the cation exchange membrane and the anion exchange membrane through the hollow pipeline; according to the invention, the wave-shaped structure in the grid net formed by the wave-shaped hollow pipeline can prevent a two-dimensional channel from being completely vertical to the direction of an electric field in the electrodialysis operation process, so that the acting force of the electric field in the channel direction is improved; and the guide pipe is used for guiding brine to enter the hollow pipeline block net to act on each area of the membrane surface, so that the utilization rate of a two-dimensional channel film ion channel is improved, the concentration polarization phenomenon of electrodialysis membrane surface ions is weakened, the lithium extraction efficiency is effectively improved, the electrodialysis energy consumption is reduced, and the application advantage is remarkable.

The present application relates to the technical field of electrodeposited chromium plating, in particular to a trivalent chromium plating layer with a pearl shell biomimetic structure and a preparation method thereof. By regulating the composition of plating solution and electrodeposition process, stable periodic concentration polarization is induced to form potential composition distribution along the thickness direction of amorphous precursor plating layer; after annealing at 350-450 DEG C for 0.5-1 h, the potential composition modulation is explicit and phase transition occurs, and the pearl shell biomimetic layered structure is constructed in situ. The plating layer presents a periodic and alternating arrangement of natural pearl shell "hard-soft" multilayer stacked biomimetic layered structure in microcosm, wherein the chromium layer is a metallic chromium crystalline layer with a thickness of 5-30 nm; the carbon / carbon-chromium mixture layer is amorphous or nanocrystalline with carbon enrichment and in-situ formed chromium carbide phase, with a thickness of 1-3 nm. The total thickness of the plating layer is 5-30 microns, and the number of layers reaches 300-1800 layers. The structure can hinder crack propagation and improve load transfer, so that the plating layer has high hardness and wear resistance. Moreover, the process is environmentally friendly and controllable, and is suitable for mechanical parts, molds and functional surface protection.

The invention relates to the technical field of electrolyzed water generators, in particular to a medical alkaline electrolyzed water generator based on blood fat regulation of hyperlipemia patients, which comprises a cathode tank and an anode tank, brackets are mounted at the bottom ends of the cathode tank and the anode tank, and an ion exchange tube is jointly mounted between the cathode tank and the anode tank; water inlet pipes are mounted at the bottom ends of the cathode tank and the anode tank. Concentration polarization of a water body to be electrolyzed can be reduced, the mass transfer efficiency of reactants and products in the electrolysis process is improved, accordingly, bubbles are prevented from being gathered on the surfaces of the first electrode bar and the second electrode bar, bubble separation can be accelerated by means of superposition of electrophoretic force generated by the electric field plate and the cavitation effect of the ultrasonic vibrators, and the electrolysis efficiency of the water body to be electrolyzed is improved. And ions can be promoted to diffuse to the surfaces of the first electrode bar and the second electrode bar, and large bubbles to be merged on the surfaces of the first electrode bar and the second electrode bar are scattered, so that the electrolysis efficiency and the electrolysis quality are effectively ensured, namely the production efficiency and the production quality of the alkaline electrolyzed water are effectively ensured.

The invention relates to the technical field of new energy, and discloses a bipolar plate, a PEM electrolytic bath and a new energy vehicle. A water inlet area, a first reaction area and a water outlet area are sequentially arranged on the anode side of a polar plate body in the bipolar plate in the water flow direction, and a plurality of water flow reaction runners communicated with the water inlet area and the water outlet area are arranged in the first reaction area; in the water flow direction, the water flow reaction flow channel is in a wave shape, and the cross section area of the water flow reaction flow channel in the width direction of the water flow reaction flow channel is gradually increased. According to the application, the wavy water flow reaction runner is arranged, so that the water turbulence is enhanced, the mass transfer efficiency is improved, and meanwhile, the water distribution is optimized and the reaction uniformity is improved. Moreover, the inlet area of the water flow reaction runner is narrow, so that bubble adhesion can be inhibited at high flow speed, fluid shear force is enhanced, and bubble adhesion is destroyed; the outlet area is wide, the sectional area is increased, the flow speed is reduced, reactant retention time is prolonged, flow resistance is reduced, tail end concentration polarization is avoided, and blockage is prevented.

The invention relates to a hollow fiber membrane gas separation process prediction method, and belongs to the technical field of membrane separation. An improved two-dimensional (2-D) mathematical model with distribution parameters is established to describe the separation process of multi-component gas, wherein external resistance caused by concentration polarization (ECP) and lumen resistance (ELR) is clearly considered. Compared with a classical one-dimensional (1-D) model with lumped parameters, the average CO2 permeability predicted by the model has better consistency with experimental data under the same condition.

The application relates to the field of power supply circuits and electric energy storage systems, and discloses a full-life-cycle adaptive optimization scheduling method for an energy storage system of a micro-grid cluster, which comprises the following steps: acquiring polarization impedance data of each energy storage branch representing electrode interface charge transfer resistance and an operating state, and decomposing bus net load power into a transient high-frequency sequence and a steady-state low-frequency sequence; distributing high-frequency fluctuation according to the reciprocal of the polarization impedance, adjusting the virtual impedance gain of a power conversion unit control loop to make the output current change rate lower than the physical boundary of ion diffusion rate; and introducing carbon emission intensity weight and loss cost function to correct the power limit value. The application establishes the physical correlation between the battery kinetics and the power fluctuation frequency, smoothes the current waveform by using the virtual impedance adjustment technology, suppresses the concentration polarization and lithium precipitation phenomenon of the electrode interface, and essentially prolongs the service life of the energy storage system.

The present invention provides an electrodialysis device for efficient concentrated brine treatment, comprising a split device housing, a flip sleeve rotatably mounted at the inner center of the split device housing, and a flip frame fixedly mounted on the surface of the flip sleeve, wherein the split device housing comprises a device lower shell and a device upper shell symmetrically arranged in the upper and lower parts. The present invention can perform ion diffusion, can help prevent pollutants from being deposited on the diaphragm through turbulence, and can work in two zones in a coordinated manner without shutting down the entire machine when a problem occurs inside, so as to solve the problem that the existing equipment cannot promote ion dispersion in the normal operating position, resulting in serious concentration polarization and low ion exchange efficiency. Secondly, dirt and impurities are easily attached to the membrane surface, causing membrane contamination, which greatly shortens the service life of the membrane. In addition, most of the existing equipment is a single processing station. Once a local problem occurs, the entire machine needs to be shut down for repair and maintenance, which will lead to production stagnation.

The invention relates to the technical field of lithium ion battery materials, in particular to a multi-layer electrode with a tree-shaped pore channel structure and a preparation method of the multi-layer electrode. The multi-layer electrode comprises a plurality of electrode layers with hierarchical pore structures, and the porosity in each electrode layer is increased layer by layer from the current collector side to the diaphragm side; the multi-layer electrode is provided with a vertical main pore channel in the direction perpendicular to each electrode layer, and the main pore channel is combined with the hierarchical pore channel structure to form a tree-shaped pore channel structure. According to the invention, synergistic conduction is realized through graded pore channel design, on the basis that a main pore channel is constructed through laser ablation in the direction perpendicular to the surface of the thick electrode, an auxiliary pore channel is constructed through additive pore forming in the direction parallel to the thick electrode, a tree-shaped ion transmission channel is formed, and the main pore channel relieves concentration polarization of the thick electrode in the thickness direction; the auxiliary hole channel promotes ions to be transmitted from the channel to the electrode body, the ion diffusion path is remarkably shortened, and the blank of current horizontal direction ion transmission research is filled.

The application discloses an ultrafiltration permeation regulation method and device based on a gradient sponge structure dialysis membrane and relates to the technical field of hemodialysis. An intelligent response membrane assembly containing a nonlinear aperture gradient is constructed; a signal is collected and a concentration polarization critical index is calculated; when the threshold value is exceeded, a multi-frequency coupling pulse control instruction containing a mechanical resonance excitation waveform and a phase reverse matching osmotic pressure oscillation waveform is generated; mechanical resonance excitation is applied to the blood side to induce membrane layer micro-breathing deformation, and an osmotic pressure oscillation waveform is injected into the dialysate side to form a reverse solute diffusion field; microgel deformation feedback signals are monitored in real time, waveform parameters are dynamically adjusted, and the concentration polarization critical index is returned to a safe interval until the ultrafiltration flux is adaptively regulated. The device comprises an intelligent gradient membrane assembly, a fluid power regulation module, an osmotic pressure wave generation module, a sensing feedback array and a central processing unit, can effectively inhibit membrane pollution and concentration polarization, and improves the system operation stability.

The utility model relates to the technical field of sewage treatment equipment, in particular to an automatic control reverse osmosis treatment device, which comprises first reverse osmosis equipment and second reverse osmosis equipment, the first reverse osmosis equipment comprises an osmosis bin, an osmosis membrane body arranged in the osmosis bin and a central pipe arranged in the osmosis membrane body, a water purification hole is formed in the central pipe, the central pipe is communicated with the permeable membrane body, the permeable membrane body divides the permeable bin into a fresh water area and a concentrated water area, the permeable bin is provided with a water inlet communicated with the fresh water area, the permeable bin is provided with a water outlet communicated with the concentrated water area, and the water outlet is in pipeline connection with a conductivity sensor. The water inlet is connected with a high-pressure pump through a pipeline, and the high-pressure pump is electrically connected with the conductivity sensor; the reverse osmosis membrane accurately controls the flow of a concentrated water area, effectively prevents impurities from forming a concentration polarization layer on the surface of the reverse osmosis membrane body, prevents the impurities from depositing into an irreversible pollution layer, and prolongs the service life of the reverse osmosis membrane body.

The application discloses the technical field of electroplating wastewater treatment high-value metal recovery system for electroplating wastewater, including electrolytic cell and electrolytic mechanism, electrolytic cell is connected with infusion tube, infusion tube is connected with electronic flowmeter, electrolytic cell top is detachably connected with cover body, cover body is provided with observation ring groove, cover body is fixedly connected with camera unit; The inside lower side of the electrolytic cell is provided with a sedimentation plate and a stirring unit, the sedimentation plate is in sliding fit with the inner side wall of the electrolytic cell, the bottom of the electrolytic cell is fixedly connected with a first weighing sensor, and the detection end of the first weighing sensor is in abutment with the bottom of the sedimentation plate; The electrolytic mechanism includes a controller, a driving unit, an adjusting unit and an electrolytic unit. The application reduces the generation of concentration polarization and activation polarization phenomenon in the process of electroplating wastewater metal treatment and recovery, recovers the wastewater metal in an efficient state, estimates the treatment and recovery effect of the wastewater metal, and improves the qualified rate of wastewater metal treatment and recovery.

This invention relates to the field of separation membrane technology, and particularly to a photothermal nanofiber membrane capable of retaining volatile organic compounds (VOCs), its preparation method, and its applications. This photothermal nanofiber membrane employs a multi-structure synergistic design to comprehensively optimize the overall performance of membrane distillation. In the gradient wettability structure of the photothermal nanofiber membrane, the hydrophobic layer, with its low thermal conductivity, suppresses heat conduction loss and alleviates temperature polarization; the hydrophilic layer, through its hydration effect, suppresses solute enrichment and alleviates concentration polarization; the nano-thin-coated PDA photothermal layer achieves efficient photothermal conversion through the light trapping effect, while simultaneously providing sufficient anchoring points for the loaded defective UiO-66 nanoparticles; the synergistic effect of each functional layer achieves multifunctional integration of thermal management, anti-fouling, photothermal conversion, and VOCs retention, comprehensively improving the operating efficiency and stability of the membrane distillation system. The preparation method provided by this invention offers strong process controllability and possesses good reproducibility and potential for large-scale application.

The utility model provides a flat plate electroplating bath device for electrolytic copper foil, which comprises an electroplating component, the electroplating component comprises an electroplating bath body, a mounting piece and an electrode plate, and the electrode plate is fixed in the electroplating bath body through the mounting piece; the electrode plates comprise a cathode plate and an anode plate; two sides of the cathode plate and the back surface far away from the anode plate are tightly attached to the inner wall of the mounting piece or the electroplating bath body. According to the utility model, the problems of concentration polarization and flow field distribution on the surface of the cathode in the use process of the flat plate electroplating bath are solved, so that the reliability of experimental data of the flat plate electroplating bath is improved, and the research and development efficiency of electrolytic copper foil is improved.

This invention discloses a simulation method for a real-size mesh channel reverse electrodialysis power generation process, comprising the following steps: S1, simplifying the real mesh channel into a two-dimensional zigzag circular mesh using the flow resistance method, and calculating the equivalent radius of the two-dimensional mesh according to the area equivalence principle; S2, selecting the smallest periodic unit membrane pair for modeling on the x-y plane, dividing the mesh, and setting membrane and solution properties, operating parameters, and boundary conditions; S3, extending the multiphysics field changes to the entire membrane pair height using the boundary coupling method; S4, calculating the membrane-side diffusion boundary layer thickness and potential abrupt change, solving for the resistance of each part of the system, and evaluating the impact of concentration polarization and ion short-circuit current on the output power. The real-size mesh channel reverse electrodialysis power generation process simulation method disclosed in this invention achieves the continuity of multiphysics field changes in the entire flow channel from the membrane pair inlet to the outlet through the boundary coupling method.

This invention discloses an electrocoagulation-ultrasound-coupled wastewater treatment device, comprising a reaction tank with an inlet on one side and an outlet on the other. Several anode plates and cathode plates, arranged in an alternating pattern, are submerged within the reaction tank. The anode plates are connected to the positive terminal of a power source, and the cathode plates are connected to the negative terminal. The device also includes an ultrasonic device disposed on the inner wall and bottom of the reaction tank. This electrochemical-ultrasound-coupled wastewater treatment device utilizes the cavitation effect and vibration acceleration of ultrasound to reduce concentration polarization in the electrocoagulation reaction. The ultrasonic cleaning action removes the passivation layer from the electrode surface, while the microbubbles generated by electrocoagulation provide dissolved gas for the ultrasonic cavitation effect, improving the ultrasonic treatment efficiency. The coupled use of these two technologies mutually stimulates the electrocoagulation reaction and ultrasonic action, significantly improving wastewater treatment efficiency and reducing energy consumption.

The utility model provides a spiral-wound membrane assembly and water purification equipment with the spiral-wound membrane assembly, the spiral-wound membrane assembly comprises a water collecting pipe, a first membrane unit and a second membrane unit, the first membrane unit and the second membrane unit are wound on the water collecting pipe, the first membrane unit is provided with a first water inlet and a first flow channel which are communicated, and a waterproof membrane is arranged in the second membrane unit; the interior of the second membrane unit is divided into a second flow channel and a third flow channel by the waterproof membrane, the first flow channel is communicated with the second flow channel, the second flow channel is communicated with the third flow channel, and a first water outlet is formed in the tail end of the third flow channel. According to the scheme, the second membrane unit comprises two surfaces, raw water flows between the two surfaces along the direction perpendicular to the water collecting pipe, and the direction change does not exist in the flowing process, so that the flow rates of the surfaces of the membrane units are the same, and a low-flow-rate region basically does not exist, so that the service life of the RO under different recovery rates can be prolonged, the dead zone problem of the second membrane unit is effectively improved, and the service life of the RO is prolonged. And the concentration polarization degree is effectively reduced.

The utility model discloses special equipment for finishing screw heads, which relates to the technical field of screw head finishing and comprises a base, an electroplating tank is fixedly mounted on the top surface of the base, electric telescopic rods are fixedly mounted on two outer sides of the electroplating tank, and an assembly plate is fixedly mounted at the top end of each electric telescopic rod. The rotating shaft rotates to drive the cam to rotate, and the spring telescopic rod is matched to drive the electroplating basket to vibrate up and down in a reciprocating manner, so that the contact area between the screw head and electrolyte is increased, the electroplating uniformity of the screw head is improved, self-circulation of the electrolyte in an electroplating tank is realized, the flowing of the electrolyte is increased, and the concentration polarization phenomenon of the electrolyte can be effectively avoided.

The utility model provides a tubular microfiltration membrane and a reaction tank. According to the micro-filtration membrane, the spiral guide sheets are arranged in the membrane tube main body to guide the tubular bundling separation membrane to spirally extend, so that a rotational flow effect is formed to break through a traditional straight-through flow channel mode, the turbulence degree of fluid is enhanced, and concentration polarization is reduced. The split type design is adopted in the structure, an upper shell and a lower shell are welded and formed, end covers at the two ends are assembled with connecting grooves through clamping blocks, a rubber plate with holes fixes a film bundle through holes, clamping grooves in the edges of the rubber plate are embedded into grooves of guide pieces to prevent flow channel bias flow, and an additionally-arranged axial flow disturbing rod and a spiral flow channel cooperate to generate multi-stage eddy currents to strengthen boundary layer disturbance. The composite supporting structure is composed of a stainless steel wire net and a gradient pore ceramic frame, the outer net improves the mechanical strength, the inner layer ceramic frame adopts 35-60% radial gradient pore distribution to achieve progressive throttling, the transmembrane pressure difference is optimized, and membrane wires are protected.

The invention discloses a forward osmosis membrane material capable of effectively improving internal concentration polarization and application thereof.The forward osmosis membrane material comprises a membrane base material, a surface modification layer and an internal concentration polarization improvement layer.The forward osmosis membrane material has the advantages that the internal concentration polarization improvement layer is introduced, the forward osmosis membrane material is prepared from nanowires, nanotubes and nanosheets, and the internal concentration polarization improvement layer is prepared from the nanowires, the nanotubes and the nanosheets; the concentration polarization phenomenon is effectively reduced, and the permeation flux and salt rejection rate of the membrane are improved, so that the membrane material can maintain relatively high performance stability in a long-time operation process, and the membrane material is particularly suitable for a scene in which industrial wastewater treatment needs long-time continuous operation; by arranging the multi-layer structure of the membrane material, not only are the permeability and selectivity of the membrane improved, but also the mechanical strength, chemical stability and anti-pollution performance of the membrane material are enhanced, and especially by introducing the reinforcing layer, one of the fiber fabric, the grid and the inorganic filler is combined with the binder, so that the anti-pollution performance of the membrane material is improved. The durability and the service life of the membrane material are obviously improved.