A kind of effluent weir based on time-sharing cooperative algae inhibition, secondary sedimentation tank and algae inhibition method

Abstract

The present application relates to sewage treatment technical field, specifically to a kind of effluent weir based on day-night time cooperation algae inhibition, secondary sedimentation tank and algae inhibition method, the weir body of effluent weir is transparent, made of high-transparency ultraviolet material, and its top opening includes several continuous arc overflow slot openings, the top end surface of arc overflow slot opening is provided with concave arc flow guide slope;Weir body water surface is coated with photocatalytic coating, and the photocatalytic coating inhibits algae under daytime sunlight;Two UVC lamps are arranged on both sides of the top opening of each arc overflow slot opening, and the two UVC lamps are closed under the action of respective photosensitive control switch in daytime sufficient light, and opened to irradiate the entire concave arc flow guide slope of the arc overflow slot opening under the condition of insufficient light at night.The effluent weir, secondary sedimentation tank and algae inhibition method of the present application inhibit the attachment and growth of algae on water surface through photocatalysis during daytime light, and inhibit algae by UVC irradiation of the uniform thin layer of water film overflowed during night or even cloudy days, so the algae inhibition effect is good.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an effluent weir, secondary sedimentation tank, and algae suppression method based on time-sharing synergistic algae suppression. Background Technology

[0002] Currently, the secondary sedimentation tank in wastewater treatment plants, as the final unit in the sludge-water separation process of secondary wastewater treatment, provides an ideal environment for algae growth due to its thin layer of water flow, abundant dissolved oxygen, and direct sunlight exposure in the effluent weir area. Excessive algae growth not only affects the appearance of the effluent, but its metabolites and aging algae also increase the concentration of suspended solids and organic matter, adversely impacting water quality. Therefore, how to efficiently, continuously, and with low maintenance costs suppress algae growth in the effluent weir is a pressing technical need in the field of water treatment engineering.

[0003] Among related technologies, algae suppression measures for effluent weirs mainly include regular manual cleaning, the addition of chemical algaecides, and the installation of ultraviolet (UV) lamps for algae suppression. Manual cleaning is labor-intensive and cannot be done continuously, making continuous algae suppression impossible, and algae easily regrow during cleaning intervals. Chemical agents can easily cause secondary pollution, and residual agents may affect the ecological environment of the receiving water body, which does not meet the requirements of green water treatment development. Ultraviolet (UV) sterilization and algae suppression are more widely used due to their lack of secondary pollution. Ultraviolet (UV) algae suppression is a recognized physical method of algae suppression and sterilization, especially short-wave ultraviolet (UVC), which can effectively destroy the DNA structure of algae. There have been attempts to apply UVC lamps to water treatment structures, such as suspending lamps above the water surface or partially submerging them above the effluent weir.

[0004] However, the existing technical solutions have the following technical problems: Firstly, when algae and other microorganisms are damaged by ultraviolet radiation, if they are exposed to visible light or long-wave ultraviolet light, the photoreactivation enzymes in their bodies will be activated, thereby repairing the damaged DNA and causing the algae to "come back to life." Traditional surface-mounted or external UVC lamps will run continuously during the day, simultaneously damaging and repairing the algae's DNA, which greatly reduces the daytime algae-suppressing efficiency and results in poor algae-suppressing effects. Secondly, the suspended lamps are either above the water surface or partially submerged in the water. Even at night, they can only suppress algae locally. Most of the UVC radiation is directed to the still water area, and a small portion of the residual light is directed to the sawtooth triangular weir. Even at night when there is no algae restoration, the suppression of algae in the overflowing water is still incomplete. Summary of the Invention

[0005] This application provides an effluent weir, secondary sedimentation tank, and algae suppression method based on time-sharing synergistic algae suppression. During the day when there is sufficient sunlight, the water-facing surface inhibits algae attachment and growth through photocatalysis. At night or even on cloudy days when there is insufficient sunlight, the overflowing uniform thin water film is irradiated by UVC to suppress algae. The time-sharing synergy results in good algae suppression effect, and the uniform thin water film further enhances the algae suppression effect of UVC irradiation at night, providing comprehensive algae suppression for the overflowing water flow.

[0006] In a first aspect, embodiments of this application provide a water outlet weir based on time-sharing synergistic algae suppression. The main body of the water outlet weir is transparent and made of a high-transmittance ultraviolet material, and its top opening includes several continuous arc-shaped overflow channels. The top surface of the arc-shaped overflow channels has an inwardly concave arc-shaped guide slope for forming a uniform thin water film when the water overflows. The water-facing surface of the main body of the weir, which is perpendicular to the horizontal plane, is coated with a photocatalytic coating. The photocatalytic coating is used to generate active oxygen under sunlight during the day to suppress algae. Two UVC lamps are installed on both sides of the top opening of each arc-shaped overflow channel. Each UVC lamp is controlled by a photosensitive control switch to turn on and off. If the ambient light intensity is greater than or equal to a preset illuminance threshold, the photosensitive control switch controls the UVC lamp to turn off. If the ambient light intensity is less than the preset illuminance threshold, the photosensitive control switch controls the UVC lamp to turn on. When the two UVC lamps are turned on, they are tilted towards each other and illuminate the entire concave arc-shaped guide slope of the arc-shaped overflow channel.

[0007] In conjunction with the first aspect, in one embodiment, the irradiation range of each UVC lamp is a divergent fan shape, the lower boundary of the divergent fan shape is located below the concave arc-shaped guide slope, and the upper boundary of the divergent fan shape is located above the center of the top surface of the arc-shaped overflow groove.

[0008] In conjunction with the first aspect, in one embodiment, the main body of the weir is formed by enclosing several arc-shaped weir units, each arc-shaped weir unit containing at least one arc-shaped overflow slot; the joint between two adjacent arc-shaped weir units is filled with transparent food-grade silicone sealant.

[0009] In conjunction with the first aspect, in one embodiment, the main body of the weir is made of high-transmittance ultraviolet quartz glass, with an ultraviolet transmittance of not less than 90% for UVC lamps; or the main body of the weir is made of high-transmittance ultraviolet acrylic, with the thickness of the high-transmittance ultraviolet acrylic being 15-20 mm thicker than that of the high-transmittance ultraviolet quartz glass, and the ultraviolet transmittance of UVC lamps being not less than 70%.

[0010] In conjunction with the first aspect, in one embodiment, the main body of the weir has inclined light trough structures on both sides of the top opening of each arc-shaped overflow channel. The light trough structures are hollow inside and open at the top, and are provided with removable sealing caps. The lamp trough structure is also provided with a downward-sloping opening at the center of the top surface of the arc-shaped overflow trough. The downward-sloping opening is provided with a quartz glass light-transmitting window. The quartz glass light-transmitting window is sealed to the inner wall of the lamp trough structure by a silicone sealing ring. Each lamp trough structure is equipped with a UVC lamp. The lamp trough structure has a track groove inside, and the UVC lamp is mounted on an aluminum substrate. The aluminum substrate is inserted and removed from the top opening and installed in the track groove.

[0011] In conjunction with the first aspect, in one embodiment, the UVC lamp employs UVC... LED light strip, the UVC The LED light strip installation angle ensures that the angle between the normal of the light-emitting surface and the horizontal plane is 30°~60°, tilted downwards, and the direction of the main optical axis is close to the center of the top surface of the arc-shaped overflow groove. The UVC The LED light strip outputs a UVC band of 265~280nm with a power of 100mW, and the surface irradiance of the uniform thin water film of the concave arc-shaped guide slope is not less than 100mW / cm².

[0012] In conjunction with the first aspect, in one embodiment, the bottom of the main body of the weir is supported by a stainless steel bracket, the top of the water-facing surface is fixed by a pressure plate, and all parts in contact with metal are lined with rubber gaskets.

[0013] In conjunction with the first aspect, in one embodiment, the photocatalytic coating is N-TiO2, which absorbs ultraviolet and visible light to function; The photocatalytic coating is applied using a sol-gel dip coating or spray coating method, with 3 to 5 coating cycles. After each coating, the coating is dried at 80°C and then calcined at 450°C for 1 hour. The final thickness of the photocatalytic coating is 300 to 500 nm.

[0014] Secondly, this application also discloses an embodiment of a secondary sedimentation tank, comprising: The aforementioned outlet weir; The solar-to-electricity system includes a charging controller, a rechargeable battery, and several solar photovoltaic panels. The solar photovoltaic panels are located outside the outlet weir and within the secondary sedimentation tank. The solar photovoltaic panels absorb light energy, convert it into electrical energy through the charging controller, and charge the rechargeable battery. The rechargeable battery supplies power to the UVC lamp. The photosensitive control switch is located between the rechargeable battery and the UVC lamp.

[0015] Thirdly, this application also discloses an algae suppression method based on the above-mentioned outlet weir, which includes the steps of: the outlet weir includes the following at all times: pool water overflows from the arc-shaped overflow channel, and the water flow forms a uniform thin water film on the concave arc-shaped guide slope; When the ambient light intensity is greater than or equal to the preset illuminance threshold, it includes: The two UVC lamps corresponding to each arc-shaped overflow outlet are turned off. The pool water contacts the water-facing surface, and sunlight penetrates the main body of the weir, irradiating the photocatalytic coating. The coating generates active oxygen, which oxidizes and decomposes attached algae and organic matter, inhibiting the attachment and growth of algae on the water-facing surface and reducing the migration of algae to the arc-shaped overflow outlet. When the ambient light intensity is less than the preset illuminance threshold, it includes: The photosensitive control switch turns on the UVC lamps. The two UVC lamps corresponding to each arc-shaped overflow outlet are tilted and shine towards each other, irradiating the uniform thin water film covering the entire concave arc-shaped guide slope. The algal DNA is destroyed, and the inactivated water film slides into the water collection tank.

[0016] The beneficial effects of the technical solutions provided in this application include: This embodiment of the application describes a time-sharing synergistic algae suppression weir. The main body of the weir is made transparent, and a photocatalytic coating is applied to the water-facing surface. A concave arc-shaped guide slope is formed at the top of the arc-shaped overflow outlet. This concave arc-shaped guide slope is used to form a uniform thin water film when water overflows. Furthermore, during periods of sufficient daylight, the two UVC lamps corresponding to each arc-shaped overflow outlet are turned off. Sunlight penetrates the transparent weir body and illuminates the photocatalytic coating, generating reactive oxygen species (hydroxyl radicals). These reactive oxygen species oxidize and decompose attached algae and organic matter, reducing algae attachment and growth on the water-facing surface, thus reducing algae migration and growth towards the weir outlet from the source. When the ambient light intensity is less than a preset threshold (i.e., at night or on cloudy days with insufficient light), a photosensitive control switch turns on the UVC lamps. When water overflows, the concave arc-shaped guide slope forms a uniform thin water film. The arc-shaped guide slope forms a uniform thin water film. Two UVC lamps corresponding to each arc-shaped overflow outlet are tilted and irradiate each other, covering the uniform thin water film on the entire concave arc-shaped guide slope of the overflow outlet. Under the dark conditions at night, the irradiation destroys the DNA of algae. The two mechanisms complement each other in time and perform their respective functions in space, achieving true all-weather uninterrupted algae suppression. Among them, the uniform thin water film further enhances the algae suppression effect of UVC irradiation at night. All overflowing water flows are irradiated for algae suppression, resulting in comprehensive algae suppression at night. The outlet weir of this application uses two different methods to suppress algae at different times. Compared with the existing algae suppression schemes, it avoids the inefficient UVC irradiation during the day, uses photocatalytic algae suppression during the day, and also improves the algae suppression effect of UVC at night, thus significantly improving the overall algae suppression efficiency and overall algae suppression effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A front view of an arc-shaped weir unit (the arc-shaped weir unit includes an arc-shaped overflow channel) is provided for the embodiments of this application. Figure 2 for Figure 1 Top view; Figure 3 for Figure 1 AA sectional view Figure 4 for Figure 1 The left view; In the diagram: 10. Arc-shaped weir unit; 101. Arc-shaped overflow channel; 102. Concave arc-shaped guide slope; 103. Water-facing side; 104. Water-returning side; 105. UVC LED light strip; 106. Quartz glass light-transmitting window; 107. Light trough structure. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0020] To facilitate understanding, here's a brief explanation: In existing technologies, a secondary sedimentation tank is a large tank structure in a wastewater treatment system. Its main function is to separate activated sludge from water, with the sludge settling to the bottom and the clarified water at the top. The effluent weir is a retaining wall located around the perimeter of the secondary sedimentation tank. The effluent weir is typically annular (often with a serrated top to increase the overflow circumference). The effluent weir acts as a threshold for the water in the tank, controlling the water level and ensuring that only the uppermost clarified liquid can flow out. The collection trough is a channel structure located adjacent to the outside of the effluent weir, slightly lower than the top of the weir. It collects the water overflowing from the effluent weir and directs it to the discharge pipe. The secondary sedimentation tank is the main body, the effluent weir is the effluent boundary of the secondary sedimentation tank, and the collection trough is located outside the effluent weir.

[0021] It is worth noting that the accompanying drawings of this application do not show the complete outlet weir, but rather a schematic diagram of a single arc-shaped weir unit. From Figure 2 It can be seen that the arc-shaped weir unit has a certain degree of curvature.

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in a first aspect, this application discloses an embodiment of an outlet weir based on time-sharing synergistic algae suppression. The main body of the outlet weir is transparent and made of a highly transparent ultraviolet material, laying the foundation for sunlight to reach the water-facing surface 103. The top opening of the outlet weir is provided with several continuous arc-shaped overflow channels 101. The top surface of the arc-shaped overflow channels 101 has a concave arc-shaped guide slope 102 (see...). Figure 3 The concave arc-shaped guide slope 102 is used to form a uniform thin water film when the water overflows.

[0023] The water-facing surface 103 of the main weir body (i.e., the inner layer of the main weir body) is perpendicular to the horizontal plane. The water-facing surface 103 is coated with a photocatalytic coating. The water-facing surface 103 contacts the pool water, and the photocatalytic coating generates active oxygen under sunlight, inhibiting algae attachment and growth. Specifically, the inner layer of the concave arc-shaped guide slope 102 is higher than the outer layer, thus forming a concave arc shape. Furthermore, under the Coanda effect, the water flow adheres closely to the concave arc surface, forming a uniform thin water film.

[0024] Two UVC lamps are installed on both sides of the top opening of each arc-shaped overflow outlet 101. Each UVC lamp is equipped with a photosensitive control switch, which controls its on / off state. When the ambient illuminance is greater than or equal to a preset illuminance threshold (sufficient light), the photosensitive control switch turns the UVC lamp off; this scenario primarily includes daytime. When the ambient illuminance is less than the preset illuminance threshold (insufficient light), the photosensitive control switch turns the UVC lamp off; this scenario primarily includes nighttime and cloudy days. For example, the preset illuminance threshold is 200 lux. Specifically, when the ambient illuminance is greater than or equal to the preset illuminance threshold, the photosensitive element of the photosensitive control switch has a high resistance, disconnecting the output and turning off the UVC lamp; when the ambient illuminance is less than the preset illuminance threshold, the photosensitive element of the photosensitive control switch has a low resistance, connecting the output and turning on the UVC lamp. Preferably, the on / off state of the UVC lamps is delayed by 15 minutes to avoid frequent switching caused by temporary differences in light intensity.

[0025] When the two UVC lamps are turned on, they are tilted to face each other, illuminating the entire concave arc-shaped guide slope 102 covering the arc-shaped overflow trough 101, that is, a uniform thin film of water covering the concave arc-shaped guide slope 102.

[0026] Specifically, all UVC lamps are turned off and on simultaneously.

[0027] To clarify beforehand, each arc-shaped overflow slot 101 corresponds to two UVC lamps, and all the positional relationships involved in this application exist within the same arc-shaped overflow slot 101.

[0028] Specifically, the principle behind the photocatalytic coating's ability to inhibit algae attachment and growth under sufficient daylight is as follows: sunlight penetrates the transparent weir body and shines on the photocatalytic coating, causing it to generate reactive oxygen species (hydroxyl radicals). These reactive oxygen species oxidize and decompose the attached algae and organic matter, thereby inhibiting algae attachment and growth on the water-facing surface 103. Specifically, the water-facing surface 103 of the weir body (i.e., the inner layer of the weir body) is perpendicular to the horizontal plane, facilitating sunlight exposure.

[0029] Furthermore, a uniform thin water film adheres to and slides down the back surface 103 (i.e., the outer layer of the main body of the weir) of the weir body. Compared with the traditional secondary sedimentation tank, where the outlet weir often adopts a sawtooth triangular weir, the water flow overflows from the sawtooth triangular weir and flows down as a water tongue or a water film adhering to the wall. The back surface is a vertical plane, resulting in poor water flow adhesion, the existence of dead zones with alternating wet and dry conditions, and the existence of long-term dry and caking areas, which are not convenient for subsequent maintenance and cleaning; the water flow from the outlet weir of this application forms a uniform thin water film, and then overflows further adhering to the wall, eliminating dead zones with alternating wet and dry conditions and facilitating cleaning and maintenance.

[0030] This embodiment of the application describes a time-sharing synergistic algae suppression weir. The main body of the weir is made transparent, and a photocatalytic coating is applied to the water-facing surface 103. A concave arc-shaped guide slope 102 is formed on the top surface of the arc-shaped overflow outlet 101. The concave arc-shaped guide slope 102 is used to form a uniform thin water film when water overflows. Furthermore, during periods of sufficient daylight, the two UVC lamps corresponding to each arc-shaped overflow outlet 101 are turned off. Sunlight penetrates the transparent weir body and illuminates the photocatalytic coating, generating reactive oxygen species (hydroxyl radicals) that oxidize and decompose attached algae and organic matter, reducing algae attachment and growth on the water-facing surface and minimizing algae migration and growth towards the weir outlet from the source. When the ambient light intensity is less than a preset illuminance threshold (i.e., at night or on cloudy days with insufficient light), a photosensitive control switch turns on the UVC lamps, and when water overflows... The concave arc-shaped guide slope 102 forms a uniform thin water film. Two UVC lamps corresponding to each arc-shaped overflow outlet 101 are tilted and irradiate each other, covering the uniform thin water film on the entire concave arc-shaped guide slope 102. Under the dark conditions at night, the irradiation destroys the DNA of algae. The two mechanisms complement each other in time and perform their respective functions in space, achieving true all-weather uninterrupted algae suppression. Among them, the uniform thin water film further enhances the algae suppression effect of UVC irradiation at night. All overflowing water flows are irradiated and suppressed, resulting in comprehensive algae suppression at night. The outlet weir of this application uses two different methods to suppress algae at different times. Compared with the existing algae suppression schemes, it avoids the inefficient UVC irradiation during the day, uses photocatalytic algae suppression during the day, and also improves the algae suppression effect of UVC at night, thus significantly improving the overall algae suppression efficiency and overall algae suppression effect.

[0031] Furthermore, in one embodiment, the irradiation range of each UVC lamp is a divergent fan shape, with the lower boundary of the divergent fan shape located below the concave arc-shaped guide slope 102 and the upper boundary of the divergent fan shape located above the center of the top surface of the arc-shaped overflow slot 101.

[0032] The two UVC lamps corresponding to each arc-shaped overflow outlet 101 form two intersecting fan-shaped irradiation zones, which can ensure that the irradiation covers the entire concave arc-shaped guide slope 102, resulting in good and comprehensive algae suppression effect at night.

[0033] like Figure 1 As shown, in one embodiment, the main body of the weir is formed by enclosing several arc-shaped weir units 10, each arc-shaped weir unit 10 including at least one arc-shaped overflow slot 101. The joint between two adjacent arc-shaped weir units 10 is filled with transparent food-grade silicone sealant to ensure no leakage.

[0034] Furthermore, in one embodiment, the main body of the weir is made of high-transmittance ultraviolet quartz glass (such as JGS2 grade), with an ultraviolet transmittance of not less than 90% for UVC lamps. Alternatively, the main body of the weir is made of high-transmittance ultraviolet acrylic (such as PMMA), with the thickness of the high-transmittance ultraviolet acrylic increased by 15-20 mm compared to the thickness of the high-transmittance ultraviolet quartz glass, and the ultraviolet transmittance of UVC lamps not less than 70%.

[0035] Preferably, the thickness of the main body of the weir is 12 mm.

[0036] Specifically, JGS2 grade ultraviolet optical grade has a slightly lower transmittance than JGS1, but it has excellent transmittance in the 220nm~2500nm wavelength range, completely covering the UVC bactericidal wavelength range (200~280nm).

[0037] Specifically, PMMA is an abbreviation for Polymethyl Methacrylate, commonly known as acrylic or plexiglass.

[0038] The effluent weir based on time-sharing synergistic algae suppression in this application embodiment uses high-transmittance ultraviolet quartz glass or high-transmittance ultraviolet acrylic as the main body of the weir. When irradiated by two UVC lamps at night, it can not only cover the entire concave arc-shaped guide slope 102, but also achieve a wider coverage area and a better algae suppression effect.

[0039] Preferably, when the main body of the weir is made of high-transmittance ultraviolet quartz glass, each arc-shaped weir unit 10 is integrally formed by high-temperature melting and casting, including the vertical surface of the water-facing surface 103, the top light groove, the arc-shaped groove, and the concave arc-shaped guide surface. All edges are rounded with a radius of not less than 3mm.

[0040] Furthermore, in one embodiment, the main body of the weir has inclined light trough structures 107 on both sides of the top opening of each arc-shaped overflow trough 101. The light trough structures 107 have double openings on both sides, namely a top opening and a downward-sloping opening.

[0041] The light trough structure 107 is hollow inside and has an opening at the top, and is equipped with a removable sealing cover. Preferably, a silicone sealing strip is provided between the sealing cover and the light trough structure 107.

[0042] The lamp trough structure 107 is also provided with a downward-sloping opening at the center of the top surface of the arc-shaped overflow trough 101 where it is located. The downward-sloping opening is provided with a quartz glass light-transmitting window 106. The quartz glass light-transmitting window 106 is sealed with the inner wall of the lamp trough structure 107 by a silicone sealing ring. Each lamp trough structure is equipped with a UVC lamp.

[0043] The lamp trough structure 107 has an internal track groove, and the UVC lamp is mounted on an aluminum substrate. The aluminum substrate is inserted and removed from the top opening and installed in the track groove.

[0044] Specifically, the UVC lamp, along with the aluminum substrate and wires, is made into an independent module that can be directly inserted and replaced through the opening at the top of the lamp slot structure 107. There is no need to disassemble the dam or stop the machine to drain the air; the operation can be carried out simply by opening the sealing cover.

[0045] Preferably, the UVC lamp is mounted on the aluminum substrate using thermally conductive silicone.

[0046] Specifically, the two quartz glass light-transmitting windows 106 are symmetrically tilted toward the center of the arc-shaped overflow channel 101.

[0047] Preferably, the thickness of the quartz glass light-transmitting window 106 is 2 mm, and the UVC transmittance exceeds 95%.

[0048] Preferably, the cross-section of the light trough structure 107 is rectangular, with a varying width of 40-60mm and a depth of 50-80mm.

[0049] The water outlet weir based on time-sharing synergistic algae suppression in this application embodiment addresses the shortcomings of existing technologies where lamps are constantly exposed to high humidity and water splashes, leading to easy scaling (inorganic salt crystallization and biofilm adhesion) on the lamp surface, severe light decay, and frequent shutdowns for cleaning or replacement. In this application, the lamp trough structure 107 is hollow, housing a UVC lamp. A removable sealing cover is provided at the top opening, and a quartz glass light-transmitting window 106 is provided at the lower sloping opening. The UVC lamp irradiates light through the quartz glass light-transmitting window 106. This application completely physically isolates the lamp cavity from the water flow channel, ensuring the UVC lamp never gets wet, thus solving the problems of easy scaling and severe light decay on the lamp surface. Only the outer surface of the flat quartz glass light-transmitting window 106 needs cleaning, making maintenance and cleaning convenient. Furthermore, the UVC lamp is installed inside the lamp trough structure 107 via an aluminum substrate and track groove, making assembly and disassembly efficient and convenient.

[0050] Furthermore, the UVC lamp uses UVC... LED light strip 105, UVC The LED light strip 105 is installed at an angle that ensures the angle between the normal of the light-emitting surface and the horizontal plane is 30°~60°, tilting downwards, with the main optical axis pointing to the center of the top surface adjacent to the corresponding arc-shaped overflow slot 101.

[0051] Specifically, the center of the corresponding concave arc-shaped guide slope 102 refers to UVC. The center of the concave arc-shaped guide slope 102 corresponding to the arc-shaped overflow slot 101 where the LED light strip 105 is located.

[0052] UVC The LED light strip 105 outputs a UVC band of 265~280nm with a power of 100mW, and the surface irradiance of the uniform thin water film corresponding to the concave arc-shaped flow guide slope 102 is not less than 100mW / cm².

[0053] This setup ensures good coverage and high efficiency in destroying algal DNA.

[0054] In one example, each arc-shaped weir unit 10 has a length of 800-1200 mm and contains 2-6 complete arc-shaped overflow slots 101. The crest spacing between adjacent slots is 150-300 mm, and the ratio of slot depth D to width W is 0.3-0.7. The total height of the weir body is 200-250 mm, and the wall thickness is 12-15 mm. The radius of curvature R of the concave arc-shaped guide slope 102 is 80-100 mm, and the angle between the guide surface and the horizontal plane is 45-60°.

[0055] In one embodiment, the bottom of the main body of the weir is supported by a stainless steel bracket, the top of the water-facing surface 103 is fixed by a pressure plate, and all parts in contact with metal are padded with rubber gaskets to achieve soft contact installation and eliminate stress concentration.

[0056] Preferably, the rubber gasket is an EPDM rubber gasket (full name Ethylene Propylene Diene Monomer, EPDM rubber) with a thickness of 3mm.

[0057] Furthermore, the photocatalytic coating uses N-TiO2 (i.e., nitrogen-doped nano-titanium dioxide), with anatase crystal form and a particle size of 20-50 nm. N-TiO2 absorbs both ultraviolet and visible light, while nitrogen doping enables TiO2 to not only absorb ultraviolet light but also utilize the abundant visible light in sunlight, thus enhancing the efficiency of daytime sunlight utilization.

[0058] The photocatalytic coating is applied using a sol-gel dip coating or spray coating method, and is uniformly applied to the water-facing surface 103 (vertical surface) of the weir. The coating is applied 3 to 5 times, and after each coating, it is dried at 80°C and finally calcined at 450°C for 1 hour. The final coating thickness is 300 to 500 nm, and the coating area covers the entire water-facing surface 103.

[0059] Preferably, before coating, the surface is pretreated by ultrasonic cleaning with ethanol, rinsing with deionized water, and drying.

[0060] Preferably, the water contact angle of the photocatalytic coating is ≤10° (superhydrophilic, which facilitates the spreading of the water film), and the methylene blue degradation rate under ultraviolet light is ≥80% (30 min).

[0061] Secondly, this application discloses an embodiment of a secondary sedimentation tank, which includes the aforementioned effluent weir and a solar-to-electricity system. The solar-to-electricity system includes a charge controller, a rechargeable battery, and several solar photovoltaic panels.

[0062] Among them, some solar photovoltaic panels are installed outside the outlet weir and within the secondary sedimentation tank.

[0063] Several solar photovoltaic panels absorb sunlight, which is converted into electrical energy by a charging controller and used to charge a rechargeable battery. The rechargeable battery then powers the UVC lamp. A photosensitive control switch is located between the rechargeable battery and the UVC lamp.

[0064] Preferably, several rechargeable batteries can be provided, with each rechargeable battery powering one UVC lamp. Preferably, the rechargeable batteries can be integrated with the UVC lamp.

[0065] The rechargeable battery uses lithium iron phosphate batteries with a voltage of 12V / 24V and a capacity sufficient for overnight power supply.

[0066] During the day: When the ambient light intensity is greater than or equal to the preset illuminance threshold (e.g., equal to 200 lux), the photosensitive control switch disconnects the UVC power supply, the solar photovoltaic panel charges the battery, and the photocatalytic coating passively inhibits algae under sunlight activation.

[0067] Nighttime: When the ambient light intensity is less than the preset illuminance threshold, the photosensitive control switch is turned on to activate the UVC power supply, and the UVC lamp is lit to actively sterilize and inactivate the overflow water membrane.

[0068] Transition period: The photosensitive control switch is set with a hysteresis range (e.g., equal to 15 minutes), that is, the switch switching is performed after a 15-minute delay to avoid frequent switching caused by cloudy days or temporary shading.

[0069] Compared to existing UVC algae suppression devices that typically use continuous mains power and require UVC lamps to be turned on for extended periods to maintain the algae suppression effect, resulting in high operating energy consumption, the secondary sedimentation tank in this application utilizes solar energy in the context of energy conservation and emission reduction in wastewater treatment plants. This results in low continuous operating energy consumption and aligns with the trend of energy conservation and emission reduction.

[0070] Thirdly, this application also discloses an algae suppression method based on the above-mentioned effluent weir, comprising the following steps: The water outlet weir includes the following at all times: the pool water inside the main body of the weir overflows from the arc-shaped overflow channel 101, and the water flow forms a uniform thin water film on the concave arc-shaped guide slope 102. When the ambient light intensity is greater than or equal to the preset illuminance threshold (including scenes with sufficient daylight), including: The two UVC lamps corresponding to each arc-shaped overflow outlet 101 are turned off. The pool water in the main body of the weir comes into contact with the water-facing surface 103. Sunlight penetrates the main body of the weir and irradiates the photocatalytic coating. The coating generates active oxygen, which oxidizes and decomposes attached algae and organic matter, inhibits the attachment and growth of algae on the water-facing surface 103, and reduces the migration of algae to the arc-shaped overflow outlet 101. When the ambient light intensity is less than the preset illuminance threshold (including scenarios with insufficient light at night or on cloudy days), it includes: The photosensitive control switch controls the UVC lamps to turn on. The two UVC lamps corresponding to each arc-shaped overflow outlet 101 are tilted and shine towards each other, irradiating the uniform thin water film covering the concave arc-shaped guide slope 102. The algal DNA is destroyed, and the inactivated water film slides into the water collection tank.

[0071] Specifically, the outlet weir includes the following throughout the entire time period: The pool water rises to the top of the weir and enters the arc-shaped overflow channel 101. The water flows to the concave arc-shaped guide slope 102, forming a uniform thin water film. As it continues to flow, it adheres tightly to the wall and forms a water film under the action of the Coanda effect.

[0072] When the ambient light intensity is greater than or equal to a preset illuminance threshold (e.g., 200 lux), it includes: When the pool water comes into contact with the water-facing surface 103 of the weir, sunlight penetrates the weir and irradiates the photocatalytic coating. The photocatalytic coating generates active oxygen (hydroxyl radicals), which oxidizes and decomposes the attached algae and organic matter, inhibiting the attachment and growth of algae on the water-facing surface 103 and reducing the migration of algae to the weir opening.

[0073] When the ambient light intensity is less than the preset illuminance threshold, it includes: The photosensitive control switch turns on the UVC lamps. The two UVC lamps corresponding to each arc-shaped overflow outlet 101 emit 265~280nm ultraviolet rays on the left and right sides. The ultraviolet rays are directed towards the concave arc-shaped guide slope 102. The ultraviolet rays of the two UVC lamps completely cover the entire concave arc-shaped guide slope 102. The water film is irradiated by UVC at close range on the arc surface. The algal DNA is destroyed. The inactivated water film slides into the water collection tank and flows into the subsequent structures in the dark environment.

[0074] Furthermore, the system cycles as follows: the next day at sunrise, when there is sufficient sunlight, the photosensitive control switch turns off the UVC lamp, and the system automatically switches back to the mode where the ambient light intensity is greater than or equal to the preset illuminance threshold.

[0075] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0076] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An effluent weir based on time-sharing synergistic algae suppression, characterized in that: The main body of the outlet weir is transparent and made of a high-transmittance ultraviolet material, and its top opening includes several continuous arc-shaped overflow slots (101); the top surface of the arc-shaped overflow slots (101) is provided with an inward arc-shaped guide slope (102) for forming a uniform thin water film when the water overflows. The water-facing surface (103) of the main body of the weir, which is perpendicular to the horizontal plane, is coated with a photocatalytic coating. The photocatalytic coating is used to generate active oxygen under daytime sunlight to inhibit algae. Two UVC lamps are respectively installed on both sides of the top opening of each arc-shaped overflow trough (101). Each UVC lamp is equipped with a photosensitive control switch to control its opening and closing. If the ambient light intensity is greater than or equal to the preset illuminance threshold, the photosensitive control switch controls the UVC lamp to turn off. If the ambient light intensity is less than the preset illuminance threshold, the photosensitive control switch controls the UVC lamp to turn on. When the two UVC lamps are turned on, they are tilted to face each other and illuminate the entire concave arc-shaped guide slope (102) of the arc-shaped overflow trough (101).

2. The effluent weir based on time-sharing synergistic algae suppression as described in claim 1, characterized in that: The irradiation range of each UVC lamp is a divergent fan shape, with the lower boundary of the divergent fan shape located below the concave arc-shaped guide slope (102) and the upper boundary of the divergent fan shape located above the center of the top surface of the arc-shaped overflow slot (101).

3. The effluent weir based on time-sharing synergistic algae suppression as described in claim 1, characterized in that: The main body of the weir is formed by several arc-shaped weir units (10), each arc-shaped weir unit (10) includes at least one arc-shaped overflow slot (101); the splicing seam between two adjacent arc-shaped weir units (10) is filled with transparent food-grade silicone sealant.

4. The effluent weir based on time-sharing synergistic algae suppression as described in claim 1, characterized in that: The main body of the dam is made of high-transmittance ultraviolet quartz glass, with a UV transmittance of not less than 90% for UVC lamps; or the main body of the dam is made of high-transmittance ultraviolet acrylic, with the thickness of the high-transmittance ultraviolet acrylic being 15-20mm thicker than that of the high-transmittance ultraviolet quartz glass, and the UV transmittance of the dam being not less than 70%.

5. The effluent weir based on time-sharing synergistic algae suppression as described in claim 3, characterized in that: The main body of the weir has inclined light trough structures (107) on both sides of the top opening of each arc-shaped overflow trough (101). The light trough structure (107) is hollow inside and open at the top, and is equipped with a removable sealing cover. The lamp trough structure (107) is also provided with a downwardly sloping opening at the center of the top surface of the arc-shaped overflow trough (101). The downwardly sloping opening is provided with a quartz glass light-transmitting window (106). The quartz glass light-transmitting window (106) is sealed with the inner wall of the lamp trough structure (107) by a silicone sealing ring. Each lamp trough structure (107) is provided with a UVC lamp inside. The lamp slot structure (107) has a track slot inside, and the UVC lamp is mounted on an aluminum substrate. The aluminum substrate is inserted and removed from the top opening and installed in the track slot.

6. The effluent weir based on time-sharing synergistic algae suppression as described in claim 5, characterized in that: The UVC lamp uses UVC. LED light strip (105), the UVC The LED light strip (105) is installed at an angle that ensures the angle between the normal of the light-emitting surface and the horizontal plane is 30°~60°, tilting downwards, with the main optical axis pointing near the center of the top surface of the arc-shaped overflow slot (101). The UVC The UVC band output by the LED light strip (105) is 265~280nm, and the power is 100mW. The surface irradiance of the uniform thin water film of the concave arc-shaped guide slope (102) is not less than 100mW / cm².

7. The effluent weir based on time-sharing synergistic algae suppression as described in claim 1, characterized in that, Includes: the bottom of the main body of the weir is supported by a stainless steel bracket, the top of the water-facing surface (103) is fixed by a pressure plate, and all parts in contact with metal are lined with rubber pads.

8. The effluent weir based on time-sharing synergistic algae suppression as described in claim 1, characterized in that, The photocatalytic coating comprises N-TiO2, which absorbs ultraviolet and visible light to function. The photocatalytic coating is applied using a sol-gel dip coating or spray coating method, with 3 to 5 coating cycles. After each coating, the coating is dried at 80°C and then calcined at 450°C for 1 hour. The final thickness of the photocatalytic coating is 300 to 500 nm.

9. A secondary sedimentation tank, characterized in that, Include: The outlet weir as described in any one of claims 1 to 8; The solar-to-electricity system includes a charging controller, a rechargeable battery, and several solar photovoltaic panels. The solar photovoltaic panels are located outside the outlet weir and within the secondary sedimentation tank. The solar photovoltaic panels absorb light energy, convert it into electrical energy through the charging controller, and charge the rechargeable battery. The rechargeable battery supplies power to the UVC lamp. The photosensitive control switch is located between the rechargeable battery and the UVC lamp.

10. A method for suppressing algae based on the effluent weir according to any one of claims 1 to 8, characterized in that, The process includes the following steps: the outlet weir includes the following steps throughout the entire time: pool water overflows from the arc-shaped overflow channel (101), and the water flow forms a uniform thin film on the concave arc-shaped guide slope (102); When the ambient light intensity is greater than or equal to the preset illuminance threshold, it includes: The two UVC lamps corresponding to each arc-shaped overflow trough (101) are turned off, the pool water contacts the water-facing surface (103), sunlight penetrates the main body of the weir and irradiates the photocatalytic coating, the coating generates active oxygen, oxidizes and decomposes attached algae and organic matter, inhibits the attachment and growth of algae on the water-facing surface (103), and reduces the migration of algae to the arc-shaped overflow trough (101). When the ambient light intensity is less than the preset illuminance threshold, it includes: The photosensitive control switch controls the UVC lamps to turn on. The two UVC lamps corresponding to each arc-shaped overflow trough (101) are tilted and illuminate each other, irradiating the uniform thin water film covering the entire concave arc-shaped guide slope (102). The algal DNA is destroyed, and the inactivated water film slides into the water collection tank.

Images