Plasma water treatment equipment and method

Abstract

The invention discloses plasma water treatment equipment and method, and the equipment comprises a housing which is provided with a water inlet pipe and a water outlet pipe; the multiple metal conduits are arranged in the shell in series, the metal conduits located at the two ends communicate with the water inlet pipe and the water outlet pipe correspondingly, a metal electrode is arranged in each metal conduit along the axis, and each metal electrode is connected with a plasma generation power source; the screen is arranged at the end part of each metal conduit and is used for filtering sewage entering or flowing out of the metal conduit; and the aeration device is connected with the plurality of metal conduits and is used for providing air into the metal conduits. According to the device, plasma is generated through air discharge, ozone, ultraviolet rays and oxidation active factors generated along with low-temperature plasma are fully utilized, organic sewage is effectively degraded in the device, and the overall efficiency of sewage treatment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a plasma water treatment device and method. Background Art

[0002] As global water pollution continues to worsen and human society gradually pays more attention to the cleanliness of water sources, the beginning and commercial application of deep and effective water treatment technology have received more and more attention. Traditional water treatment process mainly includes sedimentation filtration, acid-base neutralization decontamination, biodegradation, etc. Since the wastewater generated by the printing and dyeing industry contains a large amount of difficult-to-degrade macromolecular organic matter, the existing technology usually uses the method of adding external agents to catalyze and promote oxidation to treat difficult-to-degrade wastewater. The ability to treat difficult-to-degrade wastewater is very limited, and additional impurities are introduced, and the process cost is high and the efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to provide a plasma water treatment device and method to improve the treatment energy efficiency of difficult-to-degrade wastewater, enhance effective reactions, and improve the efficiency of effective oxidation factors, thereby simplifying the difficult-to-degrade wastewater treatment process and reducing treatment costs.

[0004] The present invention is achieved through the following technical solutions:

[0005] In a first aspect, the present invention provides a plasma water treatment device, comprising:

[0006] A housing having a water inlet pipe and a water outlet pipe;

[0007] A plurality of metal conduits are arranged in series inside the shell, and the metal conduits at both ends are respectively connected to the water inlet pipe and the water outlet pipe, each of the metal conduits is provided with a metal electrode along the axis, and each of the metal electrodes is connected to a plasma generating power source;

[0008] A screen is arranged at the end of each of the metal conduits to filter sewage entering or flowing out of the metal conduits;

[0009] The aeration device is connected to the plurality of metal conduits and is used for providing air into the metal conduits.

[0010] In some embodiments, a plurality of pointed protrusions are distributed in an axial array on the surface of the metal electrode.

[0011] In some embodiments, the metal electrode is a surface-modified metallic iron material.

[0012] In some embodiments, the inner wall of the metal conduit is lined with a photocatalytic material.

[0013] In some embodiments, the screen is a porous surface-modified metallic iron material.

[0014] In some embodiments, the plasma generating power source uses a pulsed high voltage power source, and the pulse frequency is no higher than 100 kHz.

[0015] In some embodiments, the aeration device includes an air blower and an aeration port, wherein the aeration port is respectively arranged on each of the metal conduits, and an air outlet of the air blower is connected to the aeration port through a pipeline to supply air into the metal conduit.

[0016] In some embodiments, it also includes a water quality monitor, a water outlet pump and a circulation pump, wherein the water quality monitor and the water outlet pump are sequentially arranged on the rear end pipeline of the water outlet pipe, the inlet end of the circulation pump is connected to the pipeline between the water quality monitor and the water outlet pump, and the outlet end of the circulation pump is connected to the water inlet pipe.

[0017] In some embodiments, a flow monitoring element and a flow rate monitoring element are also included. The flow monitoring element is arranged on the water inlet pipe, and the flow rate monitoring element is arranged between two adjacent connecting parts of the metal conduits.

[0018] In the second aspect, the present invention provides a plasma water treatment method, which uses the plasma water treatment equipment described in the first aspect to treat difficult-to-degrade large-molecule organic wastewater, and the organic wastewater after natural sedimentation is sent into a metal conduit through an inlet pipe, and an aeration device sends air into the metal conduit. A plasma generating power supply applies pulsed high voltage electricity to cause the tip of the metal electrode to discharge and generate plasma, which participates in the oxidation reaction of organic matter in the organic wastewater. At the same time, a screen intercepts and filters the organic wastewater. The organic wastewater after being treated by the multi-stage metal conduit enters the water quality monitor through the outlet pipe, and the outlet pump or the circulation pump is selected to start according to the flow rate monitoring situation and the water quality monitoring situation.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] The invention arranges a plurality of metal conduits in series in a shell, and sets a metal electrode to be connected with a plasma generating power source, that is, a plasma generator is formed in the metal conduit, an aeration device sends air into the metal conduit, the metal electrode discharges to generate plasma, and participates in the reaction of oxidizing organic matter in organic wastewater, and at the same time, the photocatalytic material on the inner wall of the metal conduit can accelerate the oxidation reaction, because the hydroxyl radical substances generated by plasma discharge have a short retention time, under the action of the catalyst, they react with the organic matter in the sewage in time, increase the effective collision, accelerate the bond breaking reaction of the macromolecular organic matter, the screen can gradually intercept the precipitation of large particles in the sewage, etc., the organic sewage treated by the multi-stage metal conduits enters the water quality monitor through the outlet pipe, and the outlet or circulation treatment is selected according to the flow rate and the water quality monitoring situation; the equipment generates plasma by air discharge, makes full use of ozone, ultraviolet rays and oxidation active factors generated with low-temperature plasma, effectively degrades the organic sewage in the equipment, and improves the overall efficiency of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 It is a schematic diagram of the plasma water treatment equipment in the present invention.

[0023] Marks and corresponding parts names in the attached drawings:

[0024] 1-housing, 2-plasma generating power supply, 3-water quality monitor, W1-water inlet pipe, W2-water outlet pipe, A1-metal electrode, A2-metal electrode, A3-metal electrode, M1-flow monitoring element, M2-flow velocity monitoring element, O1-gas outlet, O2-gas outlet, O3-gas outlet, 11-metal conduit, 12-metal conduit, 13-metal conduit, 14-screen, 15-screen, 21-water outlet pump, 22-circulation pump, 23-air blower, 27-sewage outlet, 28-sewage outlet, 29-grounding point. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0027] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0031] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces), unless otherwise clearly and specifically defined.

[0032] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] Example 1

[0035] Please refer to Figure 1 A plasma water treatment device provided in an embodiment of the present application comprises a housing 1, a plurality of metal conduits 11, 12, 13, a screen 14, 15 and an aeration device. The housing 1 has an inlet pipe W1 and an outlet pipe W2. The plurality of metal conduits 11, 12, 13 are arranged in series inside the housing 1, and the metal conduits 11, 13 at both ends are connected to the inlet pipe W1 and the outlet pipe W2 respectively. A metal electrode A1, A2, A3 is arranged along the axis in each of the metal conduits 11, 12, 13, and each of the metal electrodes A1, A2, A3 is connected to a plasma generating power source 2. The screens 14, 15 are arranged at the end of each of the metal conduits to filter the sewage entering or flowing out of the metal conduits. The aeration device is connected to the plurality of metal conduits 11, 12, 13 for providing air into the metal conduits.

[0036] According to some embodiments of the present application, the plurality of metal conduits 11, 12, 13 are arranged in parallel and spaced apart, and the ends of adjacent metal conduits are connected in series through arc-shaped elbows, so that the plurality of metal conduits form a sewage flow channel. Since the ends of adjacent metal conduits are connected through arc-shaped elbows, the connection portion can form a centrifugal speed reduction belt, which has a certain speed reduction effect on the passing sewage and the particle precipitation carried therein.

[0037] According to some embodiments of the present application, the housing 1 is provided with drain ports 27, 28, so that pollutants intercepted by the screens 14, 15 can be discharged through the drain ports 27, 28. The housing 1 is connected to a grounding point 29 via a wire, so that the housing is grounded when the device is working.

[0038] According to some embodiments of the present application, the screens 14 and 15 are arranged at the inlet and outlet ends of the overall circulation channel formed by the plurality of metal conduits 11, 12, and 13, so as to filter the organic sewage entering the first-stage metal conduit 11 and the effluent of the last-stage metal conduit 13. At the same time, the screen can also be arranged between adjacent metal conduits, that is, arranged in the arc-shaped bend between adjacent metal conduits, and specifically can be arranged near the inlet position of the next-stage metal conduit, so that the centrifugal deceleration belt formed by the arc-shaped bend can be used to decelerate the particle precipitation, thereby being more conducive to the interception of the particle precipitation by the screen, and at the same time, it can prevent the particle precipitation in the sewage from covering the catalyst material on the inner wall of the metal conduit. The pollutants intercepted by the screen will be regularly dredged during the maintenance of the equipment and discharged through the sewage outlet.

[0039] According to some embodiments of the present application, the surfaces of the metal electrodes A1, A2, and A3 are provided with a plurality of pointed protrusions distributed in an axial array. Specifically, the metal electrodes A1, A2, and A3 are located at the central axis of the metal conduits 11, 12, and 13, and each pointed protrusion protrudes radially of the metal conduit, and the pointed end faces the inner wall of the metal conduit, which is conducive to generating uniform discharge inside the metal conduit, thereby improving the effect of plasma discharge.

[0040] According to some embodiments of the present application, the metal electrodes A1, A2, and A3 are surface-modified metal iron materials, which are beneficial to enhancing the effect of the redox reaction.

[0041] According to some embodiments of the present application, the inner wall of the metal conduits 11, 12, 13 is lined with a photocatalytic material. Preferably, the photocatalytic material can be TiO2 material. In this design, the TiO2 material on the inner wall of the metal conduit can act as a catalyst to accelerate the oxidation reaction during the reaction process.

[0042] According to some embodiments of the present application, the screens 14 and 15 are porous surface-modified metallic iron materials, which are beneficial to enhancing the effect of the redox reaction.

[0043] According to some embodiments of the present application, the plasma generating power supply 2 uses a pulsed high voltage power supply, and the pulse frequency is not higher than 100kHz. The plasma generating power supply ensures the reaction processing speed of the plasma of the device. The lower the plasma discharge voltage, the lower the total discharge power, and the higher the concentration of the oxidative active particles, thereby improving the overall energy efficiency of the device.

[0044] According to some embodiments of the present application, the aeration device includes a blower 23 and aeration ports O1, O2, and O3, and the aeration ports O1, O2, and O3 are respectively arranged on each of the metal conduits, and the air outlet end of the blower 23 is connected to the aeration ports O1, O2, and O3 through a pipeline to send air into the metal conduit. The main function of the explosion device is to increase the concentration of oxygen in the plasma reaction, and at the same time to dissipate heat and cool the inside of the metal conduit to a certain extent, and the air filled in has a disturbing effect on the inside of the metal conduit, which can prevent the particles in the sewage from precipitating and covering the catalyst material on the inner wall of the metal conduit. Specifically, each metal conduit 11, 12, and 13 can be provided with a plurality of aeration ports, and the plurality of aeration ports are distributed in an axial array along the metal conduit, and the plurality of aeration ports are staggered with the plurality of tip protrusions on the metal electrode. An air nozzle can be provided on the aeration port, and the air outlet direction of the air nozzle is adjustable.

[0045] According to some embodiments of the present application, it also includes a water quality monitor 3, a water outlet pump 21 and a circulation pump 22, the water quality monitor 3 and the water outlet pump 21 are sequentially arranged on the rear end pipeline of the water outlet pipe W2, the inlet end of the circulation pump 22 is connected to the pipeline between the water quality monitor 3 and the water outlet pump 21, and the outlet end of the circulation pump 22 is connected to the water inlet pipe W1.

[0046] According to some embodiments of the present application, a flow monitoring element M1 and a flow rate monitoring element M2 are also included, wherein the flow monitoring element M1 is arranged on the water inlet pipe W1, and the flow rate monitoring element M2 is arranged between two adjacent connecting parts of the metal conduits. By monitoring the flow rate, the filtration speed of the sewage in this section can be reflected, and then the amount of precipitated substances generated in the metal conduit can be reflected, so as to judge whether the sewage needs to be circulated and treated later.

[0047] Example 2

[0048] A plasma water treatment method provided in the embodiments of the present application utilizes the plasma water treatment equipment described in Embodiment 1 to treat difficult-to-degrade macromolecular organic wastewater, wherein the organic wastewater after natural sedimentation is sent into a metal conduit through an inlet pipe, an aeration device sends air into the metal conduit, and a plasma generating power supply applies pulsed high voltage electricity to discharge the tip of the metal electrode to generate plasma, which participates in the oxidation reaction of organic matter in the organic wastewater, and at the same time, a screen intercepts and filters the organic wastewater, and the organic wastewater after being treated by the multi-stage metal conduit enters the water quality monitor through the outlet pipe, and the outlet pump or the circulation pump is selected to be turned on according to the flow rate monitoring situation and the water quality monitoring situation.

[0049] Specifically, the entire sewage treatment process is explained using three metal conduits as an example:

[0050] The organic sewage to be treated enters the plasma water treatment equipment from the water inlet pipe W1. A flow monitoring element M1 is provided on the water inlet pipe. The flow measurement data is transmitted to the monitoring system through a signal. A multi-layer screen is provided between the water inlet pipe W1 and the metal conduit 11 lined with TiO2 material. Before the sewage enters the metal conduit 11, the reducing metal iron material screen provided at the entrance of the metal conduit 11 intercepts the large particle precipitation and pollutants in the sewage and gradually forms a filter layer. The intercepted pollutants will be regularly dredged during the maintenance of the equipment and discharged through the sewage outlets 27 and 28. Air enters the metal conduits 11, 12, and 13 through the explosion port O1. After the sewage enters the metal conduit 11, the power is turned on, and the metal electrode generates a tip discharge to form active particles with strong oxidizing properties. The active particles participate in the oxidation reaction of organic matter in the organic wastewater. During the reaction, the TiO2 material on the inner wall of the metal conduit can be used as a catalyst to accelerate the oxidation reaction. Since the hydroxyl radical substances generated by the plasma discharge have a short residence time, they react with the organic matter in the sewage in a timely manner under the action of the catalyst, increase the effective collision, and accelerate the bond breaking reaction of the macromolecular organic matter. The sewage passing through this section of the metal conduit will continue to flow to the end of the metal conduit and enter the centrifugal speed bump formed by the arc-shaped bend. The screen in this area is the same as the reducing iron material screen at the entrance of the metal conduit, which will filter out the precipitated substances generated after the oxidation reaction in the metal conduit 11, so that the sewage without solid precipitated substances can further enter the next-level metal conduit 12. Removing solid substances in the sewage can prevent the precipitated solid substances from gradually covering the catalyst materials on the inner wall of the metal conduit after long-term sewage flushing, so that the catalyst materials cannot contact the reaction substances and become ineffective, and can reduce the collision with the active substances generated by plasma discharge. The metal electrode in the metal conduit realizes tip discharge to form plasma, and the generated hydroxyl active free radicals further oxidize the organic substances in the sewage. The metal conduit 12 is provided with an explosion port O2, and the blower 23 sends air into the metal conduit 12 through the explosion port O2. After the metal electrode is energized, the active substances generated by the ionized air molecules react with the organic components in the sewage. During the process, the TiO2 material lining the inner wall of the metal conduit plays a catalytic oxidation role. The sewage passing through this section of the metal conduit will continue to flow to the end of the metal conduit and enter the centrifugal speed reduction belt formed by the arc bend. Similarly, a reducing iron material screen is provided in this area. A flow rate monitoring element M2 is provided in this centrifugal speed reduction belt, and the flow rate measurement data is transmitted to the monitoring system through a signal. The flow rate measurement signal can reflect the filtration speed of the sewage in this section and judge the content of solid precipitation substances. If the filtration speed drops significantly, it means that the precipitation substances generated in the second-level metal conduit 12 are still relatively large. It is necessary to pay attention to the monitoring data in the water quality monitor, consider starting the circulation pump 22, circulate the sewage in this section, and open the sewage outlets 27 and 28 to clean up the solid precipitation substances.The metal conduit 13 is provided with a gas explosion port O3. The air entering the metal conduit through the gas explosion port O3 is ionized to produce active substances, which further react with the organic molecules remaining in the sewage to form harmless gases, and enter the outlet pipe W2 with the treated sewage through the reducing iron material screen at the outlet of the metal conduit. The treated sewage enters the water quality monitor 3, and after a short temporary stay, the outlet pump 21 or the circulation pump 22 is selected to be turned on according to the monitoring results. The whole process realizes the plasma discharge treatment of sewage, and the full utilization of various oxidizing factors of the discharge by-products is guaranteed in the process, including the recycling of reducing iron materials and the catalytic effect of the lining TiO2 material. The multi-polar screen filtration reduces the interference of impurities on the reaction, improves the effective collision of the reactants, and thus improves the efficiency of oxidizing organic molecules in the sewage.

[0051] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plasma water treatment device, characterized in that: include: A housing having a water inlet pipe and a water outlet pipe; A plurality of metal conduits are arranged in series inside the shell, and the metal conduits at both ends are respectively connected to the water inlet pipe and the water outlet pipe, each of the metal conduits is provided with a metal electrode along the axis, and each of the metal electrodes is connected to a plasma generating power source; A screen is disposed at the end of each of the metal conduits to filter sewage entering or flowing out of the metal conduits; The aeration device is connected to the plurality of metal conduits and is used for providing air into the metal conduits.

2. The plasma water treatment equipment according to claim 1, characterized in that: A plurality of pointed protrusions are arranged in an axial array on the surface of the metal electrode.

3. The plasma water treatment equipment according to claim 2, characterized in that: The metal electrode is a surface-modified metallic iron material.

4. The plasma water treatment equipment according to claim 1, characterized in that: The inner wall of the metal conduit is lined with a photocatalytic material.

5. The plasma water treatment equipment according to claim 1, characterized in that: The screen is a porous surface-modified metallic iron material.

6. The plasma water treatment equipment according to claim 1, characterized in that: The plasma generating power source uses a pulsed high voltage power source, and the pulse frequency is not higher than 100 kHz.

7. The plasma water treatment equipment according to claim 1, characterized in that: The aeration device comprises an air blower and an aeration port, wherein the aeration port is respectively arranged on each of the metal conduits, and an air outlet of the air blower is connected to the aeration port through a pipeline to supply air into the metal conduit.

8. The plasma water treatment equipment according to any one of claims 1 to 7, characterized in that: It also includes a water quality monitor, a water outlet pump and a circulation pump. The water quality monitor and the water outlet pump are arranged in sequence on the rear end pipeline of the water outlet pipe. The inlet end of the circulation pump is connected to the pipeline between the water quality monitor and the water outlet pump, and the outlet end of the circulation pump is connected to the water inlet pipe.

9. The plasma water treatment equipment according to claim 8, characterized in that: It also includes a flow monitoring element and a flow rate monitoring element. The flow monitoring element is arranged on the water inlet pipe, and the flow rate monitoring element is arranged between two adjacent connecting parts of the metal conduits.

10. A plasma water treatment method, using the plasma water treatment equipment according to claim 9 to treat refractory macromolecular organic wastewater, characterized in that: The organic sewage after natural sedimentation is sent into the metal conduit through the water inlet pipe, and the aeration device sends air into the metal conduit. The plasma generating power supply applies pulsed high voltage electricity to make the tip of the metal electrode discharge to generate plasma, which participates in the oxidation reaction of organic matter in the organic sewage. At the same time, the screen intercepts and filters the organic sewage. The organic sewage treated by the multi-stage metal conduit enters the water quality monitor through the outlet pipe, and the outlet pump or circulation pump is selected to start according to the flow rate monitoring and water quality monitoring conditions.

Images