Photoelectrocatalytic sewage treatment device and method

Abstract

The present invention relates to a photoelectric catalytic sewage treatment device and method, comprising: a sewage treatment unit, wherein the sewage treatment unit comprises a shell, wherein a first partition plate and a second partition plate are arranged in the shell, and the interior of the shell is divided into a sedimentation chamber, a photoelectric catalytic liquid storage chamber and a sewage treatment chamber, wherein the side of the sedimentation chamber has a first liquid inlet, the side of the sewage treatment chamber has a second liquid inlet, and the bottom thereof has a first liquid discharge port; a light-gathering reaction unit, wherein the light-gathering reaction unit comprises a base and a pair of light-gathering plates, wherein the base is located above the sewage treatment chamber and rotates relative to the sewage treatment chamber, wherein the pair of light-gathering plates are arranged on both sides of the base, wherein a photoelectric catalytic reactor is arranged on the base, wherein the photoelectric catalytic reactor has an input port and an output port, wherein a light-gathering area for gathering solar energy radiation is formed between the two light-gathering plates, wherein the rotation of the base drives the light-gathering plates to rotate and chase light, and transmits the light energy gathered in the light-gathering area to the photoelectric catalytic reactor to react with the sewage.

Description

Technical Field

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

[0002] With the increase of global population and the advancement of urbanization, in recent years, the country has gradually increased its support for the construction of rural ecological civilization, the rural domestic sewage treatment rate has steadily increased, and the rural water ecological environment has also gradually improved. At present, there are many rural domestic sewage treatment technologies in my country, which are mainly divided into several categories such as biological treatment technology, ecological treatment technology, and electrochemical and photoelectrochemical catalytic technology. Among them, rural centralized sewage treatment plants (stations) with biological treatment technology as the core are more common. As an emerging force in sewage treatment, electrochemical and photoelectrochemical catalytic technology has the following characteristics: (1) Small space occupation: This type of device occupies a small area and is suitable for places with limited space and distributed miniaturized treatment. (2) High treatment efficiency: The speed of electrochemical and photoelectrochemical catalytic reaction treatment methods is much faster than biological treatment, and the time required to treat the same volume of sewage is shorter. (3) Flexible operating conditions: Electrochemical and photoelectrochemical catalytic reaction treatment methods are not much affected by temperature and pH value, and can be operated under a wider range of environmental conditions, while biological treatment has strict requirements on environmental conditions. (4) Strong response capability: The photoelectrochemical wastewater treatment system integrates oxidation, electro-oxidation and flocculation. Under light excitation, the active oxidizing substances generated by semiconductor photocatalytic materials can attack rings and chains, converting difficult-to-degrade organic matter into biodegradable intermediates, and can more effectively treat high-concentration organic pollutants and certain difficult-to-biodegrade compounds. (5) Strong controllability: The treatment conditions of electrochemistry and photoelectrochemistry, such as current and light conditions, can be precisely controlled by instruments, and data can be easily monitored online, making it easy to realize automated operation.

[0003] However, although the sewage treatment technology with electrochemistry and photoelectrochemical catalytic technology as the core has great advantages in some aspects, its high energy consumption (especially the consumption of electricity and light energy in photoelectrocatalysis) and cost disadvantages limit its widespread application. In photoelectrocatalytic devices, the high energy consumption and unsustainability of artificial light sources have become bottlenecks. Although natural light sources are abundant, the existing collection methods are single and cannot efficiently utilize all-weather lighting resources. The three-dimensional light-chasing technology in the traditional photovoltaic industry is difficult to apply directly due to the particularity of the water treatment environment, resulting in the current use of fixed light collection, which has limited efficiency. Therefore, how to develop a photoelectrocatalytic sewage treatment device that can take into account both water treatment requirements and all-weather light-chasing functions, and various sewage treatment devices can be adapted through simple modifications to achieve efficient light focusing, which not only greatly reduces the cost of modification, but also improves the efficiency of photoelectrocatalytic reactions. This is a problem that must be solved in the current photoelectrocatalytic treatment of sewage. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the first purpose of the present invention is to provide a photoelectrocatalytic sewage treatment device, including a sewage treatment unit and a light-focusing reaction unit. The rotation of the base drives the focusing plate to rotate and chase the light, so as to transmit the light energy concentrated in the focusing area to the photoelectrocatalytic reactor to react and purify the sewage, so that the light-focusing reaction unit can realize all-day solar energy tracking and collection in the horizontal direction, thereby improving the photoelectrocatalytic reaction efficiency and sewage treatment efficiency.

[0005] The second object of the present invention is to provide a photoelectrocatalytic sewage treatment method, which uses a sewage treatment device to concentrate light energy for power generation, photocatalysis, photoelectrocatalysis and other treatments.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A photoelectrocatalytic sewage treatment device comprises: a sewage treatment unit, the sewage treatment unit comprises a shell with an open top, a first partition plate and a second partition plate are arranged circumferentially in the shell, the first partition plate and the second partition plate divide the internal space of the shell into a sedimentation chamber, a photoelectrocatalytic liquid storage chamber and a sewage treatment chamber, the side of the sedimentation chamber has a first liquid inlet for receiving sewage, the side of the sewage treatment chamber has a second liquid inlet for receiving sewage from the photoelectrocatalytic liquid storage chamber, and the bottom thereof has a first liquid discharge port for discharging purified water; a focusing reaction unit, the focusing reaction unit comprises a base and a pair of focusing The base is located above the sewage treatment chamber and rotates relative to it, a pair of focusing plates are arranged on both sides of the base and extend upward to a certain height, a photoelectric catalytic reactor is arranged on the base, one end of the photoelectric catalytic reactor has an input port for receiving sewage from the sedimentation chamber and the other end has an output port for discharging sewage to the photoelectric catalytic storage chamber, wherein a focusing area for focusing solar radiation is formed between the two focusing plates, the focusing plates are driven by the rotation of the base to rotate and chase light, and the light energy gathered in the focusing area is transmitted to the photoelectric catalytic reactor to react with the sewage, and then the sewage after the reaction is transported to the photoelectric catalytic storage chamber.

[0008] Furthermore, the length direction of the photoelectrocatalytic reactor is roughly parallel to the incident direction of solar radiation to the focusing area.

[0009] Furthermore, one end of the photoelectric catalytic reactor is provided with a light sensor for controlling the rotation of the focusing plate to chase light.

[0010] Furthermore, a rotating shaft is vertically arranged at the bottom of the base, a shaft hole for receiving the rotating shaft is provided at the top of the sewage treatment chamber, and a power input member for driving the rotating shaft to rotate is provided at the bottom thereof.

[0011] Furthermore, an energy storage unit is arranged below the sewage treatment unit, and the energy storage unit includes a cylinder, in which a plurality of batteries are arranged, and the batteries are respectively connected to the photoelectrocatalytic reactor and the power input circuit, and the side of the cylinder has a second drain port for discharging purified water.

[0012] Furthermore, the photoelectrocatalytic reactor includes an anode plate and a cathode plate arranged up and down, and a photoelectrocatalytic reaction space is defined between the anode plate and the cathode plate.

[0013] Furthermore, the anode plate includes a conductive layer and at least one catalytic layer.

[0014] Furthermore, the sewage treatment chamber comprises a dephosphorization tank and a disinfection tank which are arranged in series, the dephosphorization tank is connected to the second liquid inlet, and the disinfection tank is connected to the first liquid outlet.

[0015] Furthermore, the sedimentation chamber, the photoelectrocatalytic liquid storage chamber and the sewage treatment chamber are all cylindrical structures and are arranged coaxially from the outside to the inside. The input port of the photoelectrocatalytic reactor is equipped with an inlet pipe, one end of which extends from the top of the sedimentation chamber to below the liquid level. The output port 204b of the photoelectrocatalytic reactor is equipped with an outlet pipe, one end of which extends from the top of the photoelectrocatalytic liquid storage chamber to its interior.

[0016] According to the method using the above-mentioned photoelectrocatalytic sewage treatment device, the method comprises the following steps:

[0017] The sewage to be treated is pumped to the sedimentation chamber, and a coagulant is added into the sedimentation chamber to separate the sewage into solid and liquid; the focusing reaction unit is started, and the focusing plate is driven to rotate and chase the light by rotating the base, and the light energy gathered in the focusing area is transmitted to the photoelectrocatalytic reactor. At the same time, the sewage after solid-liquid separation in the sedimentation chamber is pumped to the photoelectrocatalytic reactor, and the light energy is used to carry out a photoelectrocatalytic reaction with the sewage, and the treated sewage is discharged into the photoelectrocatalytic storage chamber; the sewage in the photoelectrocatalytic storage chamber is sent to the sewage treatment chamber for sewage purification treatment, and finally the discharge meets the standards.

[0018] The present invention has the following advantages:

[0019] 1. The photoelectrocatalytic sewage treatment device of the present invention includes a sewage treatment unit and a light-collecting reaction unit. Through the deep integration of solar energy tracking and photoelectrocatalytic sewage treatment technology, the light-collecting plate can accurately follow the trajectory of the sun and rotate, realizing all-weather, high-precision sunlight tracking. It not only captures the energy of sunlight to the maximum extent, but also ensures that the light energy density in the light-collecting area reaches the optimal value, thereby improving the light utilization efficiency in the photoelectrocatalytic reactor. In addition, the device is also equipped with an intelligent control system that can automatically adjust the rotation speed and angle of the light-collecting plate according to the sunlight to achieve more refined light energy management.

[0020] 2. The photoelectrocatalytic sewage treatment device of the present invention fully considers the space utilization efficiency and flexibility, occupies a small area, and is particularly suitable for narrow urban spaces, remote areas, and mobile emergency treatment scenarios. The photoelectrocatalytic sewage treatment device can be modularly spliced, which is not only convenient for transportation, installation and maintenance, but also can flexibly adjust the treatment capacity according to actual needs, fully meeting the current sewage treatment needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the photoelectrocatalytic sewage treatment device of the present invention.

[0022] Figure 2 It is a three-dimensional cutaway view of the photoelectrocatalytic sewage treatment device of the present invention.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the light-gathering reaction unit of the present invention.

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the sewage treatment unit of the present invention.

[0025] Figure 5 It is a three-dimensional cutaway view of the electric energy storage unit of the present invention.

[0026] Figure 6 It is a schematic structural diagram of the photoelectrocatalytic reactor of the present invention.

[0027] Figure 7 It is a schematic diagram of the light incident cross section direction of the 45° oblique light of the focusing reaction unit of the present invention.

[0028] Figure 8 It is a light intensity distribution diagram of the light-collecting reaction unit of the present invention.

[0029] Among them, 1 is a sewage treatment unit, 101 is a shell, 101a is a first liquid inlet, 102 is a first partition plate, 102a is a second liquid inlet, 102b is a first liquid discharge port, 102c is an axial hole, 103 is a second partition plate, 1a is a sedimentation chamber, 1b is a photoelectrocatalytic storage chamber, 1c is a sewage treatment chamber, 104 is a dephosphorization tank, 105 is a disinfection tank, 106 is a dosing pump, 2 is a focusing reaction unit, 201 is a base, 202 is a first focusing plate, 203 is a second focusing plate, 204 is Photoelectrocatalytic reactor, 204a is the input port, 204b is the output port, 204c is the anode plate, 204c1 is the conductive layer, 204c2 is the catalytic layer, 204d is the cathode plate, 204e is the photoelectrocatalytic reaction space, 205 is the focusing area, 206 is the light sensor, 207 is the rotating shaft, 208 is the power input part, 209 is the water inlet pipe, 210 is the water outlet pipe, 3 is the electric energy storage unit, 301 is the cylinder, 301a is the second liquid discharge port, 302 is the battery, and 303 is the partition. DETAILED DESCRIPTION

[0030] The following description is essentially only exemplary and is not intended to limit the present invention, its application or use. It will be further understood that the term "include" and / or "comprising" specifies the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but does not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or its groups or add one or more other features, wholes, steps, operations, elements, parts and / or its groups. As used in this article, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, part or part discussed below can be referred to as the second element, part or part without departing from the teaching of the present invention. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meanings as those commonly understood by those of ordinary skill in the field to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless clearly defined in this article.

[0031] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0033] like Figure 1-4As shown, a photoelectrocatalytic sewage treatment device includes a sewage treatment unit 1 and a photoconcentrating reaction unit 2, wherein the sewage treatment unit 1 includes a shell 101 with an open top, and a first partition plate 102 and a second partition plate 103 are circumferentially arranged in the shell 101, and the first partition plate 102 and the second partition plate 103 divide the internal space of the shell 101 into a sedimentation chamber 1a, a photoelectrocatalytic liquid storage chamber 1b and a sewage treatment chamber 1c, and the side of the sedimentation chamber 1a has a first liquid inlet 101a for receiving sewage, the side of the sewage treatment chamber 1c has a second liquid inlet 102a for receiving sewage from the photoelectrocatalytic liquid storage chamber 1b, and its bottom has a first liquid discharge port 102b for discharging purified water. The housing 101 is a cylindrical structure with an open top, the first partition plate 102 and the second partition plate 103 are both annular structures and are arranged coaxially with the housing 101, the first partition plate 102 is located outside the second partition plate 103, and the internal space of the housing 101 is formed into a mutually independent sedimentation chamber 1a, a photoelectrocatalytic liquid storage chamber 1b and a sewage treatment chamber 1c, the tops of the sedimentation chamber 1a and the photoelectrocatalytic liquid storage chamber 1b are open, and the top of the sewage treatment chamber 1c has a cover plate for carrying the light-collecting reaction unit 2, of course, the shapes of the housing 101, the first partition plate 102 and the second partition plate 103 can be adjusted according to actual needs, such as square, elliptical, polygonal, etc. The light-collecting reaction unit 2 includes a base 201 and a pair of light-collecting plates, the base 201 is located above the sewage treatment chamber 1c and rotates relative to it, and the pair of light-collecting plates are arranged on both sides of the base 201 and extend upward to a certain height. A photoelectric catalytic reactor 204 is arranged on the base 201. One end of the photoelectric catalytic reactor 204 has an input port 204a for receiving sewage from the sedimentation chamber 1a and the other end thereof has an output port 204b for discharging sewage to the photoelectric catalytic storage chamber 1b. A focusing area 205 for collecting solar radiation is formed between the two focusing plates. The rotation of the base 201 drives the focusing plates to rotate and chase the light, and the light energy collected by the focusing area 205 is transmitted to the photoelectric catalytic reactor 204 to react with the sewage, and then the sewage after the reaction is transported to the photoelectric catalytic storage chamber 1b. Under the action of the light energy collected by the focusing plates, the photoelectric catalytic material in the photoelectric catalytic reactor 204 is activated, accelerating the decomposition and conversion of harmful substances in the sewage, and realizing the deep purification of the sewage. Among them, a pair of focusing plates includes a first focusing plate 202 and a second focusing plate 203 arranged opposite to each other, and the first focusing plate 202 and the second focusing plate 203 are asymmetric reflectors and have concave surfaces. The top of the base 201 is provided with a mounting groove, in which the photoelectrocatalytic reactor 204 is mounted. In an embodiment not shown, the base 201 is also provided with a solar panel to provide power for the entire device.

[0034] like Figure 1-4As shown, the sedimentation chamber 1a, the photoelectrocatalytic liquid storage chamber 1b and the sewage treatment chamber 1c are all cylindrical structures and are arranged coaxially from the outside to the inside. The input port 204a of the photoelectrocatalytic reactor 204 is equipped with an inlet pipe 209, one end of which extends from the top of the sedimentation chamber 1a to below the liquid level, and the output port 204b of the photoelectrocatalytic reactor 204 is equipped with an outlet pipe 210, one end of which extends from the top of the photoelectrocatalytic liquid storage chamber 1b to the inside thereof. Among them, the inlet pipe 209 is located below the liquid level of the sedimentation chamber 1a, and is used to extract the supernatant after solid-liquid separation. The inlet pipe 209 is also equipped with a vacuum pump for sucking sewage. The outlet pipe 210 extends into and extends to the photoelectrocatalytic liquid storage chamber 1b, which serves as a temporary storage and buffer area for sewage after photoelectrocatalytic treatment, so as to extract the photoelectrocatalytic sewage to the sewage treatment chamber 1c for further treatment. The water inlet pipe 209 and the water outlet pipe 210 rotate with the rotation of the photoelectrocatalytic reactor 204, and the water inlet pipe 209 can continuously move below the liquid level of the sedimentation chamber 1a, ensuring that the supernatant after solid-liquid separation is evenly extracted from various positions, effectively avoiding the problem of uneven concentration or sediment mixing caused by local extraction. The rotation of the water outlet pipe 210 also promotes the uniform mixing and discharge of sewage in the photoelectrocatalytic storage chamber 1b.

[0035] like Figure 7 and Figure 8 As shown, the length direction of the photoelectrocatalytic reactor 204 is roughly parallel to the direction of light incident from solar radiation to the focusing area 205 to maximize the utilization rate of light energy. Such a parallel layout can ensure that the photoelectrocatalytic reactor 204 collects sunlight all day and all directions. No matter how the position of the sun changes, the optimal illumination angle is always maintained by rotating the focusing reaction unit 2, thereby achieving efficient convergence and utilization of light energy. After being refracted by the atmosphere, the light of solar radiation can be decomposed into two components in the vertical direction and the horizontal direction. Under the configuration of keeping the photoelectrocatalytic reactor 204 parallel to the direction of the light, the light component in the vertical direction can be directly projected to the surface of the photoelectrocatalytic reactor 204 and be fully absorbed and utilized; while the component in the horizontal direction represents the offset of the light. In fact, as long as the photoelectrocatalytic reactor 204 is infinitely long, the total solar energy collected is consistent with the vertical incidence of the light, and the energy loss caused by these offsets is limited to a negligible range.

[0036] like Figure 8The light intensity distribution diagram of the focusing reaction unit is shown. As shown in the figure, when the sunlight enters the focusing reaction unit 2, the light produces a 40cm offset within a distance. However, the area of ​​reduced light intensity caused by this offset can usually be calculated and is not set as a reaction area. After the offset, the light reaches a stable and maximum focusing intensity area in the focusing reaction unit 2. At the end of another section of the focusing reaction unit 2, the light intensity does not show obvious attenuation, which conforms to the design principle, can effectively guide the light to the entire reaction area, and maintain a relatively uniform light intensity distribution. When the photoelectric catalytic reactor 204 is long enough, although the light will have a certain offset when entering the reactor, this offset will not increase with the increase of the length of the reactor. On the contrary, the area with stable maximum light intensity will increase, and the proportion will also increase. In large laser equipment or long-distance photoelectric catalytic reactors, the uneven effect of light offset can be effectively controlled or ignored, so that the entire photoelectric catalytic reactor has a smooth and consistent focusing effect.

[0037] like Figure 2 As shown, a light sensor 206 for controlling the rotation of the focusing plate to track the light is disposed at one end of the photoelectric catalytic reactor 204, which is used to detect the direction of solar radiation and control the rotation of the base 201 to achieve accurate tracking of the sun. The light sensor 206 is installed at a position opposite to the direction of solar radiation, and by detecting the incident angle of sunlight, the instant perception and prediction of the sun's position is achieved.

[0038] In an embodiment not shown, the outside of the photoelectric catalytic sewage treatment device is also configured with an intelligent control system, which includes: a data processing module, which processes and analyzes the data collected by the light sensor 206 through an artificial intelligence algorithm to determine the position of the sun and the angle at which the focusing plate needs to be adjusted; a control module, which controls the rotation of the focusing plate according to the results of the data processing module so that it can accurately rotate along the trajectory of the sun.

[0039] like Figure 2 As shown, a rotating shaft 207 is vertically arranged at the bottom of the base 201, the top of the sewage treatment chamber 1c has an axial hole 102c for receiving the rotating shaft 207 and its bottom has a power input member 208 for driving the rotating shaft 207 to rotate, ensuring the stability and accuracy of the focusing reaction unit 2 in the process of tracking the sun.

[0040] like Figure 1 and Figure 5As shown, an electric energy storage unit 3 is also arranged below the sewage treatment unit 1. The electric energy storage unit 3 includes a cylinder 301. A plurality of storage batteries 302 are arranged inside the cylinder 301. The storage batteries 302 are respectively connected to the photoelectric catalytic reactor 204 and the power input member 208 circuit to store and supply the electric energy required for the operation of the system. The side of the cylinder 301 has a second drainage port 301a for discharging purified water. The storage battery 302 is connected to the solar panel circuit, and the solar panel supplies power to the storage battery 302. A plurality of partitions 303 are also arranged inside the cylinder 301 to form a plurality of compartments for storing the storage battery 302. The middle part of the cylinder 301 has a sewage discharge channel, which is used to pass the water purified by the sewage treatment chamber 1c through the sewage discharge channel and then discharge it to the outside from the second drainage port 301a.

[0041] like Figure 6 As shown, the photoelectrocatalytic reactor 204 includes an anode plate 204c and a cathode plate 204d arranged up and down, and a photoelectrocatalytic reaction space 204e is defined between the anode plate 204c and the cathode plate 204d, and the chemical reaction in the sewage is promoted by the photoelectric effect. The anode plate 204c includes a conductive layer 204c1 and at least one catalytic layer 204c2. Among them, in the photoelectrocatalytic technology, generally through the photoanode material, the generation is regulated and the strong oxidation effect is used to achieve the degradation of pollutants, but in actual sewage treatment applications, for its photoelectrocatalytic oxidation process, due to the continuous release of protons, the solution becomes acidic, resulting in most photoanodes having to face the threat of possible photocorrosion, and more importantly, it is impossible to effectively oxidize ammonia nitrogen under acidic conditions. Among them, the cathode plate 204d and the anode plate 204c are connected by a wire circuit, the cathode material is purchased Toray carbon paper TGP-H-060, the anode material is composed of a conductive layer 204c1 and a three-layer catalyst layer 204c2, the conductive layer 204c1 is conductive glass FTO, which serves as a carrier of the catalyst layer 204c2, and the three-layer catalyst layer 204c2 is BiVO4, WO3 and BiOCl, BiVO4 is used as a photoanode, and WO3 is electro-deposited on the surface of BiVO4 to provide a protective coating to prevent BiVO4 from photocorrosion under acidic conditions. Since the WO3 catalyst layer 204c2 is more inclined to promote water oxidation to generate HO·, and HO· cannot be effectively oxidized under acidic conditions, a multi-layer catalyst structure of BiVO4, WO3 and BiOCl is constructed, in order to improve the disadvantage of poor visible light response of the BiOCl catalyst layer 204c2, and to regulate the selective oxidation of the BiVO4 and WO3 catalyst layers 204c2 from HO· to ​​generate Cl·, and selectively oxidize it through Cl· and CIO·.

[0042] like Figure 2As shown, the sewage treatment chamber 1c includes a dephosphorization tank 104 and a disinfection tank 105 arranged in series, the dephosphorization tank 104 is connected to the second liquid inlet 102a, and the disinfection tank 105 is connected to the first liquid discharge port 102b. A dosing pump 106 is also configured in the sewage treatment chamber 1c, and the dosing pump 106 is respectively connected to the dephosphorization tank 104 and the disinfection tank 105. On the one hand, it is used to pump the dephosphorization agent to the dephosphorization tank 104 to dephosphorize the sewage, and on the other hand, it is used to pump the disinfectant to the disinfection tank 105 to sterilize and disinfect the sewage to obtain purified water. Of course, the sewage treatment chamber 1c can also be configured or replaced with other conventional sewage purification devices to ensure that the sewage meets the discharge standards.

[0043] According to the method using the above-mentioned photoelectrocatalytic sewage treatment device, the method comprises the following steps:

[0044] The sewage to be treated is pumped to the sedimentation chamber 1a, and a coagulant is added in the sedimentation chamber 1a to separate the sewage into solid and liquid. Specifically, the domestic sewage is converged to the first liquid inlet 101a of the photoelectrocatalytic sewage treatment device through the sewage pipe, and is pumped into the sedimentation chamber 1a by the pump. By adding a certain amount of coagulant to the sedimentation chamber 1a, the SS and precipitable substances in the sewage settle at the bottom of the sedimentation chamber 1a over time, and the collected sediments are manually collected and processed to obtain the supernatant of the sewage.

[0045] Start the focusing reaction unit 2, drive the focusing plate to rotate and chase the light by rotating the base 201, and transmit the light energy concentrated in the focusing area 205 to the photoelectrocatalytic reactor 204. At the same time, the sewage after solid-liquid separation in the sedimentation chamber 1a is pumped into the photoelectrocatalytic reactor 204, and the photoelectrocatalytic reaction is carried out with the sewage using light energy, and the treated sewage is discharged into the photoelectrocatalytic liquid storage chamber 1b; specifically, the supernatant after solid-liquid separation is drawn into the photoelectrocatalytic reactor 204 through the water inlet pipe 209, and the intelligent control system controls the state of the pump body according to the real-time working status of the photoelectrocatalytic reactor 204 to adjust the water inlet flow rate of the photoelectrocatalytic reactor 204, so that the photoelectrocatalytic reactor 204 maintains a normal workload for stable operation.

[0046] The anode plate 204c loaded on the top of the photoelectric catalytic reactor 204 receives the light collected by a pair of condensing plates above it, and the power storage unit 3 supplies power to the photoelectric catalytic reactor 204, and utilizes the substances in the wastewater in situ to generate free radical species with high reactivity, and achieves the simultaneous removal of ammonia nitrogen, organic matter, micro-pollutants, etc. through advanced oxidation. Specifically, a photoelectric catalytic reaction occurs inside the photoelectric catalytic reactor 204, generating free radicals with high reactivity (such as Cl·, ClO·), oxidizing organic carbon to CO2, ammonia nitrogen to nitrogen, etc., achieving the functions of decarbonization and denitrification, significantly reducing the content of substances such as BOD, COD, and ammonia nitrogen, so that the water body meets the standards, and at the same time, the generated highly active free radical species will attack bacteria and viruses, partially inactivate them, and complete the function of preliminary sterilization and disinfection.

[0047] The sewage in the photoelectrocatalytic liquid storage chamber 1b is sent to the sewage treatment chamber 1c for sewage purification and finally discharged in compliance with the standards. Specifically, the sewage treatment chamber 1c includes a dephosphorization tank 104 and a disinfection tank 105 arranged in series, and the functions of dephosphorization and disinfection are achieved by adding dephosphorization agents and disinfectants (chlorine wafers, etc.).

[0048] In general, the photoelectrocatalytic sewage treatment device of the present invention includes a sewage treatment unit and a focusing reaction unit. Through the deep integration of solar energy tracking and photoelectrocatalytic sewage treatment technology, the focusing plate can accurately follow the trajectory of the sun to rotate and realize all-weather, high-precision sunlight tracking. It not only captures the energy of sunlight to the maximum extent, but also ensures that the light energy density in the focusing area reaches the optimal level, thereby improving the light utilization efficiency in the photoelectrocatalytic reactor. In addition, the device is also equipped with an intelligent control system that can automatically adjust the rotation speed and angle of the focusing plate according to the sunlight to achieve more refined light energy management. The photoelectrocatalytic sewage treatment device of the present invention fully considers the space utilization efficiency and flexibility, occupies a small area, and is particularly suitable for narrow urban spaces, remote areas and mobile emergency treatment scenarios. The photoelectrocatalytic sewage treatment device can realize modular splicing, which is not only convenient for transportation, installation and maintenance, but also can flexibly adjust the processing capacity according to actual needs, fully meeting the current sewage treatment needs.

[0049] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A photoelectrocatalytic sewage treatment device, characterized in that: include: A sewage treatment unit, the sewage treatment unit comprising a shell with an open top, a first partition plate and a second partition plate arranged circumferentially in the shell, the first partition plate and the second partition plate dividing the internal space of the shell into a sedimentation chamber, a photoelectrocatalytic liquid storage chamber and a sewage treatment chamber, the side of the sedimentation chamber having a first liquid inlet for receiving sewage, the side of the sewage treatment chamber having a second liquid inlet for receiving sewage from the photoelectrocatalytic liquid storage chamber, and a first liquid discharge port for discharging purified water at its bottom; A photoconcentrating reaction unit, wherein the photoconcentrating reaction unit comprises a base and a pair of concentrating plates, wherein the base is located above the sewage treatment chamber and rotates relative to the base, wherein the pair of concentrating plates are arranged on both sides of the base and extend upward to a certain height, wherein a photoelectric catalytic reactor is arranged on the base, wherein one end of the photoelectric catalytic reactor has an input port for receiving sewage from the sedimentation chamber and the other end has an output port for discharging sewage to the photoelectric catalytic storage chamber, wherein a concentrating area for concentrating solar radiation is formed between the two concentrating plates, wherein the concentrating plates are driven to rotate and chase light by the rotation of the base, and the light energy concentrated in the concentrating area is transmitted to the photoelectric catalytic reactor to react with the sewage, and then the sewage after the reaction is transported to the photoelectric catalytic storage chamber.

2. A photoelectrocatalytic wastewater treatment device according to claim 1, characterized in that: The length direction of the photoelectrocatalytic reactor is parallel to the incident direction of solar radiation to the focusing area.

3. A photoelectrocatalytic wastewater treatment device according to claim 1, characterized in that: One end of the photoelectric catalytic reactor is equipped with a light sensor for controlling the rotation of the focusing plate to chase light.

4. The photoelectrocatalytic wastewater treatment device according to claim 1, characterized in that: The bottom of the base is vertically provided with a rotating shaft, the top of the sewage treatment chamber is provided with an axial hole for receiving the rotating shaft, and the bottom thereof is provided with a power input member for driving the rotating shaft to rotate.

5. A photoelectrocatalytic wastewater treatment device according to claim 4, characterized in that: An energy storage unit is also arranged below the sewage treatment unit. The energy storage unit comprises a cylinder body in which a plurality of storage batteries are arranged. The storage batteries are respectively connected to the photoelectrocatalytic reactor and the power input circuit. The side of the cylinder body has a second drain port for discharging purified water.

6. The photoelectrocatalytic wastewater treatment device according to claim 1, characterized in that: The photoelectrocatalytic reactor comprises an anode plate and a cathode plate which are arranged vertically, and a photoelectrocatalytic reaction space is defined between the anode plate and the cathode plate.

7. A photoelectrocatalytic wastewater treatment device according to claim 6, characterized in that: The anode plate includes a conductive layer and at least one catalytic layer.

8. The photoelectrocatalytic wastewater treatment device according to claim 1, characterized in that: The sewage treatment chamber comprises a dephosphorization tank and a disinfection tank which are arranged in series. The dephosphorization tank is connected to the second liquid inlet, and the disinfection tank is connected to the first liquid outlet.

9. The photoelectrocatalytic wastewater treatment device according to claim 1, characterized in that: The sedimentation chamber, photoelectrocatalytic liquid storage chamber and sewage treatment chamber are all cylindrical structures and are arranged coaxially from the outside to the inside. The input port of the photoelectrocatalytic reactor is equipped with an inlet pipe, one end of which extends from the top of the sedimentation chamber to below the liquid level. The output port of the photoelectrocatalytic reactor is equipped with an outlet pipe, one end of which extends from the top of the photoelectrocatalytic liquid storage chamber to the interior thereof.

10. A method according to any one of the above claims using the photoelectrocatalytic wastewater treatment device, characterized in that: The method comprises the following steps: The sewage to be treated is pumped to a sedimentation chamber, and a coagulant is added into the sedimentation chamber to separate the sewage into solid and liquid; Start the light-collecting reaction unit, drive the light-collecting plate to rotate and chase the light by rotating the base, and transmit the light energy collected in the light-collecting area to the photoelectrocatalytic reactor. At the same time, pump the sewage after solid-liquid separation in the sedimentation chamber to the photoelectrocatalytic reactor, use light energy to carry out photoelectrocatalytic reaction with the sewage, and discharge the treated sewage into the photoelectrocatalytic liquid storage chamber; The sewage in the photoelectrocatalytic storage chamber is sent to the sewage treatment chamber for sewage purification and finally discharged in compliance with the standards.

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