Piezoelectric photocatalytic coupling integrated water treatment magnetic reactor with spiral lifting stirring function

Abstract

The piezoelectric electro-catalytic reactor for treating the organic pollutants in the wastewater is constructed, the effects of high light utilization efficiency, energy conservation and environmental protection are achieved, a stainless steel tank-shaped reactor is adopted, LED lamps serve as light sources and are evenly arranged on lamp panels on the two sides of a piezoelectric electro-catalytic area, a magnetic field is added to the lower portion, aeration is used as an auxiliary means, and the energy-saving and environment-friendly effects are achieved. Organic pollutants in a water body are subjected to photocatalytic degradation, the spiral rod is driven to rotate through the pushing effect of kinetic energy of fluid on the propeller, piezoelectric electro-catalytic particles are conveyed to the upper portion of the reactor, meanwhile, self-cleaning of the particles is conducted, and then the piezoelectric electro-catalytic particles are evenly distributed through the baffle by means of the stirring effect of the stirring paddle. And sufficient contact between the particles and the water body is realized. Separation of piezoelectric electro-catalysis particles from the treated water body is completed in the settling area through the flow guide area and the flow baffle, the particles flow back to the particle hopper and participate in the reaction again, an emptying pipe is arranged at the bottom of the reactor, and the piezoelectric electro-catalysis particles can be discharged and replaced.

Description

Technical Field

[0001] The present invention relates to a water treatment reactor for water purification and disinfection, which mainly utilizes the collision effect and photocatalytic effect exerted by the combination of piezoelectric materials and water flow, and combines hydraulic stirring to couple the photocatalyst with hydraulic stirring to achieve water purification and disinfection, belonging to the fields of water treatment and environmental protection. Background Art

[0002] Piezoelectric materials generate mechanical deformation under external force, triggering charge separation and piezoelectric polarization effects; photocatalytic materials trigger the separation of photo-generated carriers of semiconductor catalysts under the excitation of a light source with a specific wavelength, and synergistically achieve the efficient degradation of water pollutants.

[0003] The combination of piezoelectric materials and photocatalytic materials can also achieve coupling of effects in water treatment. When the photocatalytic medium on the surface adsorbs pollutants and hinders the contact with light, the piezoelectric material can absorb external force to exert advanced oxidation and degrade pollutants from the inside, thereby removing the obstacle of pollutants to the light source of the photocatalytic medium.

[0004] Piezoelectric materials undergo displacement of positive and negative charge centers under mechanical stress, triggering the dipole polarization effect; the piezoelectric system involving catalysts usually relies on external mechanical excitation (such as hydraulic stress) to trigger a change in the polarization state, thereby inducing an induced electric field and generating equal amounts of opposite-sign shielding charges on the surface.

[0005] Piezoelectric materials generate a built-in electric field under the action of hydraulic stirring, driving free e - and h + to migrate towards the surface of the piezoelectric material, thereby leading to water decomposition, degradation of organic pollutants, CO 2 reduction and bacterial disinfection.

[0006] Since light cannot completely penetrate water, sufficient energy needs to be provided to excite the photocatalyst. Therefore, during the photocatalytic degradation process, continuous stirring is usually required to ensure that sufficient light irradiates the surface of the catalyst. In the piezoelectric coupling photocatalytic technology, this part of the hydraulic force can provide energy for the piezoelectric material to generate electrons, which is a more efficient and energy-saving technical means.

[0007] Adjusting the polarization intensity through hydraulic stirring realizes the adsorption and desorption of surface space charges, reducing the dependence on light and electricity.

[0008] The hydraulic stirring effect can strengthen the mass transfer process, and the ultrasonic cavitation effect and sonocatalytic effect synergistically significantly improve the overall catalytic efficiency.

[0009] External magnetic fields can change the molecular spin state and local electronic structure, and thus affect the light absorption process. The magnetic field can enhance the light absorption ability of photocatalysts.

[0010] The magnetic field effect generates a Lorentz force on the carriers. Since electrons and holes carry positive and negative charges respectively, when they move together in the same direction according to the rules, the directions of the applied Lorentz forces are opposite, thus promoting their separation and improving the photocatalytic efficiency.

[0011] The local magnetic flux enhancement technology can be adapted to any photocatalytic system by coupling magnetic particles with the photocatalyst without changing the intrinsic properties of the photocatalyst.

[0012] The publication number CN 201473358 U provides a sewage treatment device with a spiral deflector and ultraviolet light generation in the middle. The swirling structure is used to slow down the rising speed and extend the contact time, thereby improving the treatment effect.

[0013] The publication number CN109045769A discloses a spiral tailings sewage rapid precipitation and concentration tank, including an outer cylinder, an inner cylinder, a buffer plate, an overflow plate, etc. Through the spiral tailings sewage inlet channel and tailings sewage outlet channel, the precipitation stroke of the tailings sewage is extended, and the efficiency of tailings sewage precipitation and concentration is further improved.

[0014] As demonstrated by Gupta et al. (Gupta B B, Howell J A, Wu D, et al. A helical baffle for cross-flow microfiltration[J]. 1995, 102: 31 - 42.), when a spiral baffle exists, the rotational component can reduce the particle deposition rate, thus enabling the particles to be in more sufficient contact with the sewage. Summary of the Invention

[0015] The object of the present invention is to construct a highly efficient photocatalytic reactor for the degradation of toxic, harmful, and difficult-to-biodegradable organic pollutants, the degradation of high-concentration organic pollutants, the degradation of constant organic pollutants, the disinfection of the effluent water body, domestic water use, and for short-range reclaimed water reuse facilities.

[0016] In view of the technical application drawbacks of piezoelectric photocatalysis, the present invention proposes a technical solution for an integrated water treatment reactor with piezoelectric photocatalysis coupled with spiral lifting and stirring. First, the reactor utilizes the kinetic energy of fluids (including water flow and air flow) to drive the propeller to rotate, which in turn drives the spiral rod to rotate to lift the piezoelectric-photocatalytic particles. The rotation of the spiral rod also drives the rotation of the curved baffle and the stirring paddle. There is a curved baffle attached to its top to intercept the piezoelectric-photocatalytic particles with a certain kinetic energy and make them evenly sprinkle onto the piezoelectric photocatalytic area. Thus, the rotating stirring paddle makes the particle distribution more uniform and can create a certain pressure difference gradient, generating and enhancing the piezoelectric effect of the piezoelectric-photocatalytic particles. Second, light sources are provided on both sides of the piezoelectric photocatalytic area, and a magnetic field is arranged below it to promote the photocatalytic reaction. At the same time, an aeration device is also provided at the bottom of the equipment, which can enhance the pressure gradient in a local area. Especially at the moment when the bubbles burst or combine, it can cause a huge change in the local space pressure, which will promote the piezoelectric effect. During this period, aeration will also provide electron acceptors for the piezoelectric catalysis and photocatalytic reactions, promoting the catalytic effect. Third, the project adopts the concept of coupling piezoelectric catalysis and photocatalysis. Technically, piezoelectricity can inhibit the electron-hole recombination of photocatalysis. The piezoelectric effect exists everywhere in the design, making up for the deficiencies in the propagation of light sources and enabling the particles to have self-repair and maintenance functions. Finally, the equipment uses magnetism to inhibit the electron-hole recombination of piezoelectricity and photocatalysis, providing a catalytic effect, and the magnetic field itself also has the functions of disinfection and sterilization.

[0017] To implement the above solution, the present invention designs an integrated water treatment reactor with piezoelectric photocatalysis coupled with spiral lifting and stirring. Piezoelectric-photocatalytic particles are installed in the reactor main body. A particle hopper for collecting particles, a drain pipe, an air supply pipe, and a microporous aeration head are provided at the bottom. A spiral rod is installed in the middle of the bottom. Stirring paddles and particle baffles are provided on the spiral rod, and light sources are arranged around. The particle hopper is a device for collecting particles and providing a good transportation environment for the spiral rod. The drain pipe is used for replacing and discharging the particles. The air supply pipe and the microporous aeration head further improve the advanced oxidation efficiency. The lower water inlet pipe enters in a spiral water inlet mode. After the water flow passes through the reaction area and under the action of the diversion, it enters the sedimentation area on the outer periphery of the upper part of the reactor after entering the diversion area. The particles in the water flow will settle to the particle hopper at the bottom of the reactor. The particles can be lifted again to the upper part of the piezoelectric photocatalytic area by the spiral rod driven by the driving device, and are evenly sprinkled onto the piezoelectric photocatalytic area under the rotation of the baffle and the spiral rod and the agitation of the stirring paddle. The treated water will flow into the water outlet tank and flow out through the outlet pipe.

[0018] For the reactor as described above, an LED lamp is used as the light source for the photocatalytic reaction.

[0019] For the reactor as described above, a magnetic field is arranged under the LED lamp boards on both sides of the piezoelectric photocatalytic area to enhance the absorption of light by the piezoelectric-photocatalytic particles and improve the photocatalytic performance.

[0020] The reactor as described above uses sandy piezoelectric photocatalytic particles with a particle size controlled within 0.01 mm - 5 mm. According to the main wavelength of the LED light source, appropriate photocatalytic particles are selected so that the photocatalytic particles can efficiently absorb and utilize the LED light source for photocatalytic degradation of organic pollutants.

[0021] The reactor as described above uses a self - driving device, which can adjust the height of the screw rod and the propeller up and down to adapt to different operating conditions.

[0022] The reactor as described above is provided with baffle plates and a diversion area, so that the treated water can be smoothly discharged to the sedimentation area, and the separation of the piezoelectric photocatalytic particles from the water is completed. The piezoelectric photocatalytic particles flow back to the piezoelectric photocatalytic area, and the treated water flows out from the outlet pipe through the water outlet trough.

[0023] For the reactor as described above, the redundant piezoelectric photocatalytic particles are discharged through the emptying pipe.

[0024] The reactor as described above adopts a stainless - steel tank structure form. Description of the Drawings

[0025] Figure 1 It is a three - dimensional schematic diagram of a piezoelectric photocatalytic coupling integrated water treatment reactor with spiral lifting and stirring of the present invention.

[0026] Figure 2 It is a front view of the piezoelectric photocatalytic coupling integrated water treatment reactor with spiral lifting and stirring of the present invention.

[0027] Figure 3 It is a side view of the piezoelectric photocatalytic coupling integrated water treatment reactor with spiral lifting and stirring of the present invention.

[0028] Figure 4 It is a top view of the piezoelectric photocatalytic coupling integrated water treatment reactor with spiral lifting and stirring of the present invention.

[0029] Figure 5 It is a three - dimensional diagram of the screw rod device in the reactor of the present invention.

[0030] Names referred to by each numerical label in the drawings: 1 - inlet pipe, 2 - S pole, 3 - stirring paddle, 4 - piezoelectric photocatalytic particles, 5 - lamp board, 6 - water outlet trough, 7 - baffle plate, 8 - diversion area, 9 - driving device, 10 - propeller, 11 - sedimentation area, 12 - outlet pipe, 13 - particle baffle, 14 - screw rod, 15 - N pole, 16 - aeration device, 17 - emptying pipe, 18 - particle hopper, 19 - air inlet, 20 - piezoelectric photocatalytic area. Detailed Embodiments

[0031] The following further describes the specific implementation manners of the present invention in conjunction with the accompanying drawings and technical solutions.

[0032] Piezo-photocatalytic particles 4 are added to the particle hopper 18 in the reactor. Water enters through the single-side spiral water inlet pipe 1 of the reactor, air enters through the bottom air inlet 19 and is aerated by the aeration device 16. The kinetic energy of the fluid (including water flow and air flow) drives the propeller 10, which in turn drives the screw rod 14 and the stirring paddle 3 to rotate, forming a self-driven device to uniformly stir the piezo-photocatalytic particles 4. At the same time, the screw rod 14 drives the piezo-photocatalytic particles 4 to rise to the top, and under the action of the particle baffle 13, they are evenly scattered into the piezo-photocatalytic zone 20. LED light boards 5 and magnetic field S pole 2 and N pole 15 are arranged on both sides of the piezo-photocatalytic zone, thereby improving the water purification efficiency.

[0033] During the process of the piezo-photocatalytic particles 4 being lifted by the screw rod 14, due to friction, collision and other effects, piezo-photocatalytic action will occur, which has a self-cleaning effect on the pollutants on the particle surface.

[0034] After the water body is treated, it passes through the diversion zone 8 and the baffle 7 and enters the sedimentation zone 11 for the separation of the piezo-photocatalytic particles 4 and the water flow.

[0035] After being separated, the piezo-photocatalytic particles 4 can enter the particle hopper 18 and be recycled.

[0036] The purified or disinfected water body then flows out of the reactor through the water outlet trough 6 and the water outlet pipe 12.

[0037] The redundant and ineffective piezo-photocatalytic particles 4 can be discharged from the reactor through the emptying pipe 17, and new piezo-photocatalytic particles 4 can be replaced.

[0038] LED light boards 5 and magnetic field S pole 2 and N pole 15 are arranged on both sides of the piezo-photocatalytic zone to improve the piezo-photocatalytic efficiency.

[0039] When the driving kinetic energy of the fluid is insufficient, the driving device 9 can be started to drive the reactor to continue running.

Claims

1. A piezoelectric photocatalytic reactor for water treatment, characterized by including a water inlet pipe, an emptying pipe, an aeration device, a self-driven spiral stirring device, piezoelectric photocatalytic particles, an LED light board, a magnetic field, a guide area, a baffle, a driving device, a sedimentation area, a water outlet trough, and a water outlet pipe.

2. According to the reactor described in claim 1, the kinetic energy of the fluid (including water flow and air flow) is used to push the propeller to drive the screw rod to lift the piezoelectric photocatalytic particles to a high place, during which the surface of the piezoelectric photocatalytic particles is self-cleaned. The rotation of the screw rod will also drive the rotation of the curved baffle and the stirring paddle. A curved baffle is attached to the top to intercept the piezoelectric photocatalytic particles with a certain kinetic energy and make them evenly sprinkled into the piezoelectric photocatalytic area, so that the rotating stirring paddle rotates to make the particles more evenly distributed. The aeration device consists of an aeration pipe and a microporous aeration head connected to it. The water inlet pipe is arranged on the side of the reactor, and a light source is arranged around the piezoelectric photocatalytic area. A magnetic field is arranged under the light source, and a slope for recovering piezoelectric photocatalytic particles is arranged at the bottom. Then, after the water flows through the reaction area, it enters the precipitation area through the action of the guide plate, and the clarified water at the top flows out through the outlet pipe of the water outlet trough. An emptying pipe is arranged at the bottom of the reactor for replacing and discharging the piezoelectric photocatalytic particles.

3. According to the reactor of claim 1, the kinetic energy of the fluid (including water flow and air flow) drives the propeller to rotate, and a stirring paddle is provided on the propeller to stir the water flow and the piezoelectric photocatalytic particles.

4. The reactor according to claim 1 is provided with a curved baffle on the top to intercept piezoelectric photocatalytic particles with a certain kinetic energy and make them fall evenly into the piezoelectric photocatalytic area.

5. The device according to claim 1, characterized in that LED lamps are used as light sources for photocatalysis, and are evenly arranged on both sides of the piezoelectric photocatalytic area, and a magnetic field is set therebelow.

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