A photocatalyst-based water treatment device

Abstract

The application discloses a water treatment device based on photocatalysis, which comprises an umbrella-shaped support frame and an umbrella surface arranged on the umbrella-shaped support frame; a water collecting and driving mechanism and a photocatalytic treatment mechanism are arranged on the umbrella surface; the photocatalytic treatment mechanism is located at the lower end of the water collecting and driving mechanism; the photocatalytic treatment mechanism comprises a photocatalytic inclined surface and a photocatalytic kick surface which are connected; and a photocatalyst is arranged on the photocatalytic inclined surface and / or the photocatalytic kick surface. The device can utilize solar energy to perform photocatalytic treatment, effectively removes pollutants in wastewater such as initial rainwater, and is efficient and free of secondary pollution.

Description

A photocatalytic water treatment device Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a water treatment device based on photocatalysis. Background Technology

[0002] Initial rainwater generally refers to precipitation that has formed a 10-15mm layer of surface runoff. In the early stages of rainfall, rainwater dissolves pollutants such as acidic gases, vehicle exhaust, and factory emissions from the air. After falling, rainwater washes over rooftops and other surfaces, introducing large amounts of organic matter and suspended solids. Therefore, initial rainwater is highly polluted and cannot be directly recycled; it must be treated before further use.

[0003] Chinese utility model patent CN202221189922.8 discloses an initial rainwater pretreatment device, including a housing and a water tank. The water tank is installed inside the housing. A support column is installed at the bottom of the housing, and a water collector is installed at the top of the housing. A rain divider is installed in the middle of the water collector. Several rain divider openings are opened on the side of the water collector, and the rain divider openings are connected to a clean water pipe. A filter screen is installed inside the clean water pipe. The clean water pipe is coiled on the outside of the water tank and connected to the water tank. A water outlet pipe is installed at the bottom of the housing, and the water tank is connected to the water outlet pipe. The clean water pipe is placed in the gap between the water tank and the housing, thereby reducing the space occupied. When it rains, the rainwater collects in the water collector and flows to the rain divider openings through the rain divider. After being screened by the grid of the rain divider openings, large-volume impurities are left in the water collector. The rainwater flows to the water supply pipe through the water divider pipes and is filtered by the filter screens of multiple water filter pipes. The relatively pure rainwater is stored in the water tank, thus completing the pretreatment of the initial rainwater. This device requires rainwater to be removed through a screen, which can cause blockages when the water contains easily adhering substances such as grease. Chinese utility model patent CN202020502210.1 discloses an initial rainwater flocculant mixing and treatment device, including a diversion well, an initial rainwater treatment tank, a dosing device, a lift pump, a suction pipe, an initial rainwater distribution pipe, and initial rainwater. The diversion well contains the dosing device, lift pump, and suction pipe. The dosing device includes a reagent tank, a linkage solenoid valve, and a dosing pipe. The reagent tank is connected to the dosing pipe, and the dosing pipe is equipped with the linkage solenoid valve. The lower end of the dosing pipe connects to the bottom suction port of the lift pump, and the upper end of the lift pump is connected to the suction pipe, which connects to the initial rainwater treatment tank and the initial rainwater distribution pipe. Although this device can guarantee flocculation effect, it suffers from technical problems such as high treatment cost and demanding operation requirements. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a photocatalytic water treatment device. This device is easy to operate and can not only efficiently treat wastewater containing organic matter, such as initial rainwater, but also prevent secondary pollution.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This invention provides a photocatalytic water treatment device, comprising an umbrella-shaped support frame and an umbrella surface disposed on the umbrella-shaped support frame; the umbrella surface is provided with a water collection driving mechanism and a photocatalytic treatment mechanism; the photocatalytic treatment mechanism is located at the lower end of the water collection driving mechanism; the photocatalytic treatment mechanism includes a connected photocatalytic inclined surface and a photocatalytic kicking surface; a photocatalyst is laid on the photocatalytic inclined surface and / or the photocatalytic kicking surface.

[0007] Furthermore, the umbrella-shaped support frame includes a column, umbrella ribs, and diagonal braces; multiple umbrella ribs and diagonal braces are provided, and their numbers are matched; the umbrella canopy is laid on the umbrella ribs; one end of the umbrella rib is rotatably connected to the top of the column via a bearing; one end of the diagonal brace is rotatably connected to the column via a bearing.

[0008] Furthermore, it also includes a vertical positioning mechanism; the vertical positioning mechanism includes at least three right-angle brackets or right-angle triangles; one right-angle side of the right-angle bracket or right-angle triangle is fixed to the column, and the other right-angle side is set away from the top of the column; the at least three right-angle brackets or right-angle triangles are evenly arranged with the column as the axis.

[0009] Furthermore, the water collection drive mechanism includes an elevated water tank, a water collection trough, and a water distribution trough disposed below the water collection trough; a vertical drive baffle is provided on one side of the water collection trough; the vertical drive baffle is arranged parallel to the umbrella rib; the outlet of the elevated water tank is not parallel to the vertical drive baffle; the water distribution trough has a ring structure and is arranged around the umbrella surface.

[0010] Furthermore, multiple sets of the water collection tanks are arranged around the column as an axis.

[0011] Furthermore, a triangular overflow weir is provided at the downstream end of the water distribution trough; the height of the triangular overflow weir is not lower than that of the photocatalytic inclined surface; the rainwater in the water distribution trough flows to the photocatalytic inclined surface via the triangular overflow weir.

[0012] Furthermore, the photocatalytic inclined surface and / or the photocatalytic kick surface are provided with grooves for laying the photocatalyst.

[0013] Furthermore, the photocatalytic treatment mechanism is provided in multiple sets; the multiple sets of photocatalytic treatment mechanisms extend sequentially from the water collection drive mechanism to the edge of the umbrella surface in the order of "-photocatalytic inclined surface-photocatalytic kicking surface-photocatalytic inclined surface-photocatalytic kicking surface-".

[0014] In the technical solution of the present invention, the photocatalyst can decompose organic matter in rainwater and wastewater awaiting treatment into small molecule inorganic matter.

[0015] Furthermore, the photocatalyst is a g-C3N4 / ZnO composite photocatalyst.

[0016] Furthermore, it also includes a magnetoelectric processor; the magnetoelectric processor is disposed at the edge of the umbrella surface and includes opposing first magnets and second magnets, a "U"-shaped connector connecting the first magnets, a wire, and electrodes; the cavity of the "U"-shaped connector is oriented towards the umbrella surface, such that the first magnets are located above and below the umbrella surface, respectively; the wire is disposed between the first magnets; and the electrodes are disposed at both ends of the wire.

[0017] Furthermore, the column is provided with a diagonal brace, one end of which is fixedly connected to the "U"-shaped connector.

[0018] Furthermore, the electrode is a Mn / Ag carbon-based composite electrode.

[0019] The above technical solution has the following advantages or beneficial effects:

[0020] The device provided by this invention can utilize solar energy for photocatalytic treatment, effectively removing pollutants from initial rainwater and other wastewater, with high efficiency and no secondary pollution.

[0021] The device provided by this invention can be installed on the roof. It can drive the device to rotate by utilizing the water level potential energy difference of the high-level water tank, without the need for additional power, thus saving energy and being environmentally friendly.

[0022] In this invention, the two magnetic rings in the magneto-electric processor can form a fixed magnetic field. As the umbrella rotates, the metal wires and electrodes move within this magnetic field, cutting magnetic lines of force, thereby generating an electric current. Through reduction / oxidation reactions on the two electrodes, pollutants in initial rainwater and other wastewater are removed by oxidation / reduction. The reaction mechanism for removing nitrogen oxides from rainwater is as follows:

[0023] 2NO3 - +12H + +10e - →N2 + 6H2; NO3 - +9H + +8e - →NH3+3H2.

[0024] The device in this invention has a simple structure and is easy to maintain. It can not only treat initial rainwater, but also has a large water collection mechanism at the edge of its umbrella surface to collect the treated rainwater for further utilization, thereby saving water resources. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the water treatment device based on photocatalysis in Embodiment 1 of the present invention;

[0026] Figure 2 is a schematic diagram of the water collection tank and water distribution tank in Embodiment 1 of the present invention;

[0027] Figure 3 is a schematic diagram of the photocatalytic inclined surface and the photocatalytic kicking surface in Embodiment 1 of the present invention;

[0028] Figure 4 is a schematic diagram of the structure of the magnetoelectric processor in Embodiment 1 of the present invention;

[0029] In Figures 1 to 4: (1-1)-Column, (1-2)-Right-angled triangle, 2-First bearing, 3-Second bearing, 4-Umbrella-shaped support frame, (4-1)-Umbrella rib, (4-2)-Diagonal brace, (5-1)-Vertical drive baffle, (5-2)-Water collection tank, 6-Water distribution tank, 7-Photocatalytic inclined surface, 8-Photocatalytic kick surface, 9-Magnetic and electrical processor, (9-1)-First magnet, (9-2)-Second magnet, (9-3)-"U"-shaped connector, (9-4)-Diagonal rod, (9-5)-Wire, (9-6)-Electrode. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the protection scope of the present invention.

[0031] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] Example 1

[0034] As shown in Figures 1 to 4, this embodiment provides a water treatment device based on photocatalysis, including an umbrella-shaped support frame 4 and an umbrella surface disposed on the umbrella-shaped support frame 4; a water collection driving mechanism and a photocatalytic treatment mechanism are disposed on the umbrella surface; the photocatalytic treatment mechanism is located at the lower end of the water collection driving mechanism; the photocatalytic treatment mechanism includes a connected photocatalytic inclined surface 7 and a photocatalytic kicking surface 8; a photocatalyst is laid on the photocatalytic inclined surface 7 and / or the photocatalytic kicking surface 8.

[0035] Furthermore, the umbrella-shaped support frame 4 includes a column 1-1, umbrella ribs 4-1, and diagonal braces 4-2; multiple umbrella ribs 4-1 and diagonal braces 4-2 are provided, and their numbers match; the umbrella surface is laid on the umbrella ribs 4-1; one end of the umbrella ribs 4-1 is rotatably connected to the top of the column 1-1 through a first bearing 2; one end of the diagonal braces 4-2 is rotatably connected to the column 1-1 through a second bearing 3.

[0036] In some specific embodiments, the inner rotor of the first bearing 2 is sleeved on the column 1-1 and fixedly connected to the column 1-1, thereby realizing the rotational connection between the umbrella rib 4-1 and the column 1-1.

[0037] In some specific embodiments, the inner rotor of the second bearing 3 is sleeved on the column 1-1 and fixedly connected to the column 1-1, thereby realizing the rotational connection between the diagonal brace 4-2 and the column 1-1.

[0038] In some specific embodiments, the umbrella ribs 4-1 and the diagonal braces 4-2 are made of stainless steel; the umbrella canopy is made of transparent rigid plastic.

[0039] Furthermore, it also includes a vertical positioning mechanism; the vertical positioning mechanism includes at least three right-angle brackets or right-angle triangles 1-2; one right-angle side of the right-angle bracket or right-angle triangle 1-2 is fixed to the column 1-1, and the other right-angle side is set away from the top of the column 1-1; at least three right-angle brackets or right-angle triangles 1-2 are evenly arranged with the column 1-1 as the axis.

[0040] Furthermore, the water collection drive mechanism includes an elevated water tank (not shown in the figure), a water collection trough 5-2, and a water distribution trough 6 disposed below the water collection trough 5-2; a vertical drive baffle 5-1 is provided on one side of the water collection trough 5-2; the vertical drive baffle 5-1 is arranged parallel to the umbrella rib 4-1; the elevated water tank is used to store wastewater to be treated, and its outlet port is not parallel to the vertical drive baffle 5-1; the water distribution trough 6 has a ring structure and is arranged around the umbrella surface.

[0041] In the technical solution of this invention, water in the elevated water tank can flow to the vertical drive baffle through a water pipe. In this embodiment, the water collection drive mechanism utilizes the height difference between the elevated water tank and the vertical drive baffle to convert the potential energy of the water into the kinetic energy of the vertical drive baffle, thereby driving the entire umbrella surface to rotate.

[0042] In some specific implementations, the port of the water outlet of the high-level water tank forms an angle with the vertical drive baffle 5-1. When the angle is 90 degrees, the driving effect of the water collection drive mechanism is optimal.

[0043] Furthermore, multiple sets of water collection tanks 5-2 are arranged with column 1-1 as the axis.

[0044] Furthermore, a triangular overflow weir is provided at the downstream end of the water distribution trough 6; the height of the triangular overflow weir is not lower than that of the photocatalytic inclined surface 7; the rainwater in the water distribution trough 6 flows to the photocatalytic inclined surface 7 through the triangular overflow weir.

[0045] Furthermore, the photocatalytic inclined surface 7 and / or the photocatalytic kick surface 8 are provided with grooves for laying the photocatalyst.

[0046] Furthermore, the photocatalytic treatment mechanism is provided in multiple sets; the multiple sets of photocatalytic treatment mechanisms extend from the water collection drive mechanism to the edge of the umbrella surface in the order of "-photocatalytic inclined surface-photocatalytic kicking surface-photocatalytic inclined surface-photocatalytic kicking surface-".

[0047] In the technical solution of the present invention, the photocatalyst can decompose organic matter in rainwater and wastewater awaiting treatment into small molecule inorganic matter.

[0048] In some specific implementations, the photocatalyst is a g-C3N4 / ZnO composite photocatalyst.

[0049] In some specific embodiments, the preparation steps of the g-C3N4 / ZnO photocatalyst are as follows:

[0050] (1) Melamine was calcined at 500-700℃ for 4-8h to prepare g-C3N4 precursor; ZnO precursor was prepared by hydrothermal reaction of zinc salt and citric acid in an alkaline alcohol aqueous solution at 120-150℃ for 12-36h.

[0051] (2) Add the dispersion of g-C3N4 precursor to the dispersion of ZnO precursor, and centrifuge at 1000-1500 r / min for 5-10 min to obtain photocatalyst.

[0052] The zinc salt is selected from at least one of hydrochloride, acetate, nitrate and sulfate; the alkali is selected from at least one of sodium hydroxide, potassium hydroxide and ammonia.

[0053] In some specific embodiments, the mass ratio of zinc salt to citric acid is 1.0:0.75;

[0054] In some specific embodiments, the ratio of citric acid to sodium hydroxide is 0.75 g : 0.015 mol;

[0055] In some specific embodiments, the preparation of the g-C3N4 precursor also includes a grinding process.

[0056] In some specific embodiments, the preparation of the ZnO precursor also includes post-treatment; the post-treatment includes washing and drying; the drying is preferably carried out at 60-80°C for 12-36 hours.

[0057] In some specific implementations, the mass ratio of g-C3N4 precursor to ZnO precursor is 2:3;

[0058] In some specific embodiments, centrifugation is followed by post-treatment; the post-treatment includes drying; drying is preferably done at 60-80°C for 36-48 hours.

[0059] Furthermore, it also includes a magnetoelectric processor 9; the magnetoelectric processor 9 is disposed at the edge of the umbrella surface and includes a first magnet 9-1 and a second magnet 9-2 facing each other, a "U"-shaped connector 9-3 connecting the first magnet 9-1 and the second magnet 9-2, a wire 9-5 and an electrode 9-6; the cavity of the "U"-shaped connector 9-3 is oriented towards the umbrella surface, so that the first magnet 9-1 and the second magnet 9-2 are located above and below the umbrella surface, respectively; the wire 9-5 is disposed between the first magnet 9-1 and the magnet; the electrode 9-6 is disposed at both ends of the wire 9-5.

[0060] In some specific embodiments, the first magnet 9-1 and the second magnet 9-2 may be ring magnets for easy fixation.

[0061] In some specific embodiments, the wire 9-5 is disposed on the upper or lower surface of the umbrella canopy.

[0062] Furthermore, a diagonal brace 9-4 is provided on the column 1-1, and one end of the diagonal brace 9-4 is fixedly connected to the "U"-shaped connector 9-3.

[0063] In some specific embodiments, electrodes 9-6 are Mn / Ag carbon-based composite electrodes.

[0064] In some specific embodiments, the preparation method of the Mn / Ag carbon-based composite electrode includes the following steps:

[0065] (1) Mn(NO3)2, NaOH and H2O2 are reacted in solution to obtain a precipitate;

[0066] (2) The precipitate was placed in NaOH solution and subjected to hydrothermal reaction at 120-180℃ for 12-24h to obtain δ-MnO2;

[0067] (3) Stir δ-MnO2 in HCl solution for 24-72 h to obtain H-MnO2;

[0068] (4) H-MnO2 was reacted with tetramethylammonium hydroxide (TMAOH) in an aqueous solution for 6 to 9 days to obtain MnO2 nanosheet slurry;

[0069] (5) React MnO2 nanosheet slurry with NaBH4 in aqueous solution at 0° for 10-30 min, then add AgNO3 and polyvinylpyrrolidone (PVP), stir evenly, and then irradiate under a 300W high-pressure mercury lamp for 3-6 h.

[0070] (6) After mixing and grinding the above reactants with conductive agent and binder, add dispersant and grind evenly, coat the coating on copper foil with a coating thickness of 20 μm; dry at 60-90℃ for 24-36 h to obtain the electrode.

[0071] In some specific implementations, in step (1), the ratio of NaOH to H2O2 is 0.2154 mol: 13.653 g;

[0072] In some specific implementations, in step (1), the ratio of Mn(NO3)2 to NaOH is 0.2154 mol: 0.06 mol;

[0073] In some specific embodiments, the amount of Mn(NO3)2 manganese nitrate in step (1) and the amount of NaOH solution in step (2) are related as follows: 0.06 mol corresponds to 100 mL of NaOH solution with a concentration of 2 mol / L.

[0074] In some specific implementations, step (2) includes post-treatment of washing and drying after the hydrothermal reaction.

[0075] In some specific embodiments, in step (3), the amount of δ-MnO2 and HCl solution is related as follows: 1g corresponds to 100mL of HCl solution with a concentration of 0.1mol / L.

[0076] In some specific implementations, step (3) also includes post-treatment of washing and drying.

[0077] In some specific embodiments, in step (4), the ratio of H-MnO2 to tetramethylammonium hydroxide is 1g:0.0875mol;

[0078] In some specific implementations, step (4) also includes post-processing such as washing and centrifugation.

[0079] In some specific embodiments, in step (5), the ratio of the amount of MnO2 nanosheet slurry to NaBH4, AgNO3, and polyvinylpyrrolidone is 0.08g:0.018g:0.04g:0.02g;

[0080] In some specific implementations, step (5) also includes post-treatment of washing and drying; drying is carried out at 60-80°C for 3-5 hours.

[0081] In some specific implementations, in step (6), the conductive agent is carbon powder;

[0082] In some specific implementations, in step (6), the adhesive is polyvinylidene fluoride (PVDF);

[0083] In some specific embodiments, in step (6), the dispersant is N-methylpyrrolidone (NMP);

[0084] In some specific embodiments, in step (6), the mass ratio of the product from step (5) to the conductive agent and polyvinylidene fluoride is 4:5:1.

[0085] The application process and principle of the photocatalytic water treatment device provided in this embodiment are as follows:

[0086] The elevated water tank collects and stores initial rainwater awaiting treatment. The stored water flows through the outlet to the vertical drive baffle 5-1. The height difference between the elevated water tank and the vertical drive baffle 5-1 can convert the potential energy of the wastewater to be treated into the kinetic energy of the vertical drive baffle 5-1, thereby driving the umbrella ribs 4-1, the umbrella surface, etc. to rotate around the column.

[0087] While rotating, the wastewater to be treated enters the distribution trough through the collection trough, and the annular distribution trough achieves uniform water distribution on the umbrella surface; the rainwater in the distribution trough 6 flows to the photocatalytic treatment mechanism through its triangular overflow weir structure. The photocatalysts on the multiple photocatalytic inclined surfaces 7 and photocatalytic kick surfaces 8 continuously arranged in the photocatalytic treatment mechanism can absorb sunlight and undergo photocatalytic reactions to remove organic pollutants from the rainwater.

[0088] Finally, the photocatalytically treated wastewater flows through the magnetoelectric processor 9 at the edge of the umbrella. The wires 9-5 in the magnetoelectric processor 9 cut magnetic lines of force within the magnetic field generated by the first and second magnets, thus generating an electric current. The two electrodes 9-6 act as the cathode and anode for the electrochemical reaction. Nitrogen compounds in the water undergo reduction at the cathode and oxidation at the anode, thereby removing nitrogenous pollutants from the water.

[0089] In this embodiment, the water treatment device can be equipped with a water collection mechanism at or below the edge of the umbrella surface to collect the treated water for further use.

[0090] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A water treatment device based on photocatalysis, characterized in that, The device includes an umbrella-shaped support frame and an umbrella surface mounted on the support frame. A water collection drive mechanism and a photocatalytic treatment mechanism are mounted on the umbrella surface. The photocatalytic treatment mechanism is located at the lower end of the water collection drive mechanism. The photocatalytic treatment mechanism includes a connected photocatalytic inclined surface and a photocatalytic kick surface. A photocatalyst is laid on the photocatalytic inclined surface and / or the photocatalytic kick surface. The water treatment device also includes a magnetoelectric processor. The magnetoelectric processor is located at the edge of the umbrella surface and includes opposing first and second magnets, and a U-shaped connection connecting the first and second magnets. The umbrella includes a component, a wire, and electrodes; the cavity of the "U"-shaped connector is oriented towards the umbrella surface, such that the first magnet and the second magnet are located above and below the umbrella surface, respectively; the wire is disposed between the first magnet and the second magnet; the electrodes are disposed at both ends of the wire; the umbrella-shaped support frame includes a column, umbrella ribs, and diagonal braces; multiple umbrella ribs and diagonal braces are provided, and their numbers are matched; the umbrella surface is laid on the umbrella ribs; one end of the umbrella rib is rotatably connected to the top of the column through a bearing; one end of the diagonal brace is rotatably connected to the column through a bearing.

2. The water treatment device according to claim 1, characterized in that, It also includes a vertical positioning mechanism; the vertical positioning mechanism includes at least three right-angle brackets or right-angle triangles; one right-angle side of the right-angle bracket or right-angle triangle is fixed to the column, and the other right-angle side is set away from the top of the column; the at least three right-angle brackets or right-angle triangles are evenly arranged with the column as the axis.

3. The water treatment apparatus according to claim 1, characterized in that, The water collection drive mechanism includes a high-level water tank, a water collection trough, and a water distribution trough disposed below the water collection trough; a vertical drive baffle is provided on one side of the water collection trough; the vertical drive baffle is arranged parallel to the umbrella ribs; the outlet of the high-level water tank is not parallel to the vertical drive baffle; the water distribution trough has a ring structure and is arranged around the umbrella surface.

4. The water treatment apparatus according to claim 3, characterized in that, Multiple sets of water collection tanks are arranged around the column as an axis.

5. The water treatment apparatus according to claim 3, characterized in that, A triangular overflow weir is provided at the downstream end of the water distribution trough; the height of the triangular overflow weir is not lower than that of the photocatalytic inclined surface; the rainwater in the water distribution trough flows to the photocatalytic inclined surface through the triangular overflow weir.

6. The water treatment apparatus according to claim 1, characterized in that, The photocatalytic inclined surface and / or photocatalytic kick surface are provided with grooves for laying the photocatalyst.

7. The water treatment apparatus according to claim 1, characterized in that, The photocatalytic treatment mechanism is provided in multiple sets; the multiple sets of photocatalytic treatment mechanisms extend sequentially from the water collection drive mechanism to the edge of the umbrella surface in the order of "-photocatalytic inclined surface-photocatalytic kicking surface-photocatalytic inclined surface-photocatalytic kicking surface-".

8. The water treatment apparatus according to claim 1, characterized in that, The column is provided with a diagonal brace, one end of which is fixedly connected to the "U"-shaped connector.

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