Method for rapid treatment of initial rainwater

Abstract

The present application relates to a method for quickly treating initial rainwater, which is collected by a sewage collection pipe network and then discharged into an inlet channel, and the water in the inlet channel is treated by mechanical coarse grid and mechanical fine grid to obtain pretreated sewage, and the pretreated sewage is sequentially treated by a sand settling tank, an oil removal tank, an electrolytic flocculation reaction tank, an electrolytic catalytic oxidation tank and a high-efficiency UV treatment tank, and then discharged after reaching the standard. The present application can quickly purify and treat the initial rainwater, which is helpful to clean the water quality entering the river. Compared with the traditional dosing, magnetic treatment and membrane treatment technologies, the present application has the advantage of being more efficient. The present application can improve the main indicators of the water quality, especially the sensory quality of the water, by quickly flocculating and electrolytic catalysis in the electrolytic technology, and combining a certain wavelength of UV to control organic matter and bacterial colonies. The present application can quickly sterilize and disinfect the sewage by setting the high-efficiency UV treatment tank, which has high sterilization efficiency and good sterilization effect.

Description

Technical Field

[0001] The invention relates to a method for quickly treating initial rainwater, belonging to the technical field of sewage treatment. Background Art

[0002] Initial rainwater, as the name suggests, is rainwater at the beginning of a rainfall event. It generally refers to the 10-15mm thick precipitation that forms surface runoff. During this initial period, rainwater dissolves a significant amount of pollutants, including acidic gases, vehicle exhaust, and factory exhaust, from the air. Once it reaches the ground, it washes over roofs and asphalt concrete roads, leaving it laden with pollutants. This pollutant level is high, even exceeding that of ordinary urban sewage. This rainwater is discharged directly into rivers through stormwater pipes, causing a certain degree of pollution to the water environment.

[0003] The initial rainwater contains a large amount of pollutants such as organic matter, pathogens, heavy metals, oil, suspended solids, etc.

[0004] Currently, the methods for purifying initial rainwater include: adding chemicals, magnetic treatment, membrane treatment, etc.; the purification effects of the above water treatment methods are limited. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a method for rapid treatment of initial rainwater. The specific technical solution is as follows:

[0006] The rapid treatment method for initial rainwater is to discard the initial rainwater and collect it into the inlet channel through the sewage collection network. The water in the inlet channel is treated by mechanical coarse screen and mechanical fine screen to obtain pretreated sewage. The pretreated sewage is sequentially treated by the grit chamber, oil removal tank, electrolytic flocculation reaction tank, electrolytic catalytic oxidation tank, and high-efficiency UV treatment tank before it meets the discharge standards.

[0007] A further optimization of the above technical solution is that the high-efficiency UV treatment tank includes a metal tank, an ultrasonic transducer is installed at the bottom of the metal tank, and a UV light source assembly is arranged in an array inside the metal tank. The UV light source assembly includes a floating plate, a UVLED light strip, a permanent magnet, a spring, and an electromagnet in order from top to bottom. The upper end of the UVLED light strip is fixedly connected to the lower part of the floating plate, the lower end of the UVLED light strip is fixedly connected to the upper end of the permanent magnet, the lower end of the permanent magnet is fixedly connected to the upper end of the spring, and the lower end of the spring is fixedly connected to the upper end of the electromagnet. The lower end of the electromagnet is fixedly connected to the bottom of the metal groove; the UVLED light strip includes a strip body and a plurality of UVLED lamp beads installed on the front of the strip body, the UVLED lamp beads are hemispherical structures, and the surface of the strip body is provided with a transparent waterproof layer; the UVLED lamp beads are arranged at equal intervals, and the front of the transparent waterproof layer is provided with a groove located between two adjacent UVLED lamp beads, and the inner wall of the groove is an elliptical surface structure; the back of the strip body is provided with a plurality of airbags arranged along the length direction of the strip body, and the outer side walls of the airbags are fixedly connected to the back of the strip body.

[0008] A further optimization of the above technical solution is that the transparent waterproof layer is made by encapsulating and sealing the LED encapsulation glue.

[0009] A further optimization of the above technical solution is that the frequency of the ultrasonic transducer is 23-26 kHz.

[0010] A further optimization of the above technical solution is that the electromagnet intermittently generates magnetic forces that attract or repel the permanent magnet, and the magnetic forces that attract the permanent magnet and the magnetic forces that repel the permanent magnet appear alternately, with an alternating cycle of 9-16 seconds. The electromagnet is energized for 3-6 seconds during the alternating cycle, and the rest is the time when the power is off.

[0011] Further optimization of the above technical solution, the airbag is made of transparent material, the air pressure inside the airbag is 0.33-0.38Mpa; when the belt body is in a vertical state, the volume inside the airbag is x, in cm 3 The vertical distance between the central axis of the airbag and the bottom of the metal groove is h, in cm; h = 0.013x 2 -y;1133≤y≤2689.

[0012] In a further optimization of the above technical solution, a pull rope is fixedly installed between two adjacent floating plates, and the floating plates and the pull rope are connected to form a grid structure.

[0013] In a further optimization of the above technical solution, the bar spacing of the mechanical coarse grid is 16-30 mm, and the bar spacing of the mechanical fine grid is 1.5-2 mm.

[0014] Further optimization of the above technical solution, the anode in the electrolytic flocculation reaction cell is an anode iron plate with a nano-coating, the nano-coating is titanium dioxide with a grain size of 15-50nm, the cathode in the electrolytic flocculation reaction cell is an iron cathode plate, the pH value of the electrolytic flocculation reaction cell is adjusted to 5-6 before the electrolysis reaction, the operating voltage between the anode and the cathode is 3.5-7.2V, and the current density is 66-130mA / cm 2 .

[0015] Further optimization of the above technical solution, the electrode plates in the electrolytic catalytic oxidation tank are made of stainless steel or graphite, the plate spacing of the electrode plates is 13-18 cm, an aeration head is installed at the bottom of the electrolytic catalytic oxidation tank and aeration is conducted into the electrolytic catalytic oxidation tank, and the flow rate of aeration into the electrolytic catalytic oxidation tank is 0.8-1m 3 / h, a catalyst filling area is provided in the middle of the electrolytic catalytic oxidation tank, and the catalyst filling used in the catalyst filling area is a composite molecular sieve with a particle size of 0.35-5.5 mm, and the composite molecular sieve is made of molecular sieve loaded with neodymium oxide. The filling volume of the catalyst filling in the catalyst filling area is 55%, and the current density between the anode and the cathode is 2.2-3.5 mA / cm 2 .

[0016] Beneficial effects of the present invention:

[0017] 1) This invention can rapidly purify initial rainwater, contributing to the cleanliness of incoming river water. Compared to traditional technologies such as dosing, magnetic treatment, and membrane treatment, this invention offers the advantage of greater efficiency. By utilizing rapid electrolytic coagulation and electrocatalysis, combined with UV light of a specific wavelength to control organic matter and bacterial colonies, this invention improves key effluent quality indicators, particularly enhancing the sensory properties of the water.

[0018] 2) The present invention provides a high-efficiency UV treatment tank, which can quickly sterilize and disinfect sewage with high sterilization efficiency and good sterilization effect.

[0019] 3) The water treatment capacity designed by the present invention is 300m 3 / d, the purification efficiency of initial rainwater is high and the purification effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of the method for rapid treatment of initial rainwater according to the present invention;

[0021] Figure 2 This is a structural diagram of the high-efficiency UV treatment tank of the present invention (top view);

[0022] Figure 3 This is a schematic structural diagram of the UV light source assembly of the present invention;

[0023] Figure 4 SS, COD values ​​and frequency in Example 8;

[0024] Figure 5 This is a graph showing the relationship between the coliform group value and frequency in Example 8. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Example 1

[0027] like Figure 1 As shown, the method for rapid treatment of initial rainwater is to discard the initial rainwater and collect it into the inlet channel through the sewage collection network. The water in the inlet channel is treated by mechanical coarse screen and mechanical fine screen to obtain pretreated sewage. The pretreated sewage is sequentially treated by the grit chamber, oil removal tank, electrolytic flocculation reaction tank, electrolytic catalytic oxidation tank, and high-efficiency UV treatment tank before being discharged in compliance with the standards.

[0028] The mechanical coarse grid has a bar spacing of 16-30 mm, and the mechanical fine grid has a bar spacing of 1.5-2 mm. The mechanical coarse grid is used to remove floating objects and large suspended objects, while the mechanical fine grid removes small suspended objects.

[0029] The sand settling tank is used to precipitate, separate and remove inorganic particles with high specific gravity (particle size greater than 0.2mm) in the pretreated wastewater.

[0030] The degreasing tank adopts a plate-type degreasing tank, with flat or inclined plates inside, and the plates are spaced 20-50mm apart. During degreasing operation, water flows downward, oil droplets float upward, and the sludge slides to the bottom of the tank. It can remove 60μm oil droplets with a short residence time.

[0031] Furthermore, intermittent aeration can be performed inside the degreasing pool to generate a large number of bubbles. Grease is adsorbed on the bubbles to form a foam layer containing grease pollutants on the water surface. Collecting the foam layer is conducive to removing grease.

[0032] Example 2

[0033] Based on Example 1, the anode in the electrolytic flocculation reaction cell is an anode iron plate with a nano-coating, the nano-coating is titanium dioxide with a grain size of 15-50 nm, the cathode in the electrolytic flocculation reaction cell is an iron cathode plate, the pH value of the electrolytic flocculation reaction cell is adjusted to 5-6 before the electrolysis reaction, the operating voltage between the anode and the cathode is 3.5-7.2 V, and the current density is 66-130 mA / cm 2 .

[0034] The electrolytic flocculation tank achieves a COD removal rate of 41.3% in wastewater. Strong oxidizing substances such as oxygen radicals and hydroxyl radicals generated by electrolysis kill microorganisms, bacteria, algae, and plankton in the water. They also oxidize and decompose organic matter in the water, reducing COD. The electric field promotes the flocculation and precipitation of impurities in the water. The gases generated during the electrolysis process form a large number of bubbles, which rise to facilitate subsequent solid-liquid separation, further reducing pollution indicators such as COD, color, and turbidity.

[0035] Example 3

[0036] Based on Example 1, the electrode plates in the electrolytic catalytic oxidation tank are made of stainless steel or graphite, the plate spacing of the electrode plates is 13-18 cm, an aeration head is installed at the bottom of the electrolytic catalytic oxidation tank and aeration is conducted into the electrolytic catalytic oxidation tank, and the flow rate of aeration into the electrolytic catalytic oxidation tank is 0.8-1 m 3 / h, a catalyst filling area is provided in the middle of the electrolytic catalytic oxidation tank, and the catalyst filling used in the catalyst filling area is a composite molecular sieve with a particle size of 0.35-5.5 mm, and the composite molecular sieve is made of molecular sieve loaded with neodymium oxide. The filling volume of the catalyst filling in the catalyst filling area is 55%, and the current density between the anode and the cathode is 2.2-3.5 mA / cm 2 .

[0037] The catalyst filler uses molecular sieve as a carrier and loads neodymium oxide active components, which can improve the removal rate of ammonia nitrogen in sewage, reaching a removal rate of ammonia nitrogen in sewage of 56.2%; the role of aeration is to catalyze the cathode and accelerate the reaction of the catalyst filler area.

[0038] After the sewage to be treated enters the electrolytic catalytic oxidation tank, it is fully mixed with the catalyst filler under the action of aeration. At the same time, an oxidation reaction occurs under the action of the electric field. Aeration can ensure that the oxidation reaction continues. After the oxidation reaction is completed, the water and catalyst filler together purify the sewage.

[0039] Example 4

[0040] Based on Example 1, Figure 2 、 3As shown, the high-efficiency UV treatment tank includes a metal tank 10, an ultrasonic transducer is installed at the bottom of the metal tank 10, and a UV light source assembly 20 is arranged in an array inside the metal tank 10. The UV light source assembly 20 includes a floating plate 24, a UVLED light strip, a permanent magnet 25, a spring 26, and an electromagnet 27 from top to bottom. The upper end of the UVLED light strip is fixedly connected to the lower part of the floating plate 24, the lower end of the UVLED light strip is fixedly connected to the upper end of the permanent magnet 25, the lower end of the permanent magnet 25 is fixedly connected to the upper end of the spring 26, the lower end of the spring 26 is fixedly connected to the upper end of the electromagnet 27, and the lower end of the electromagnet 27 is fixedly connected. The end is fixedly connected to the bottom of the metal groove 10; the UVLED light strip includes a strip body 21, a plurality of UVLED lamp beads 22 installed on the front of the strip body 21, the UVLED lamp beads 22 are hemispherical structures, and the surface of the strip body 21 is provided with a transparent waterproof layer 23; the UVLED lamp beads 22 are arranged at equal intervals, and the front of the transparent waterproof layer 23 is provided with a groove 231 located between two adjacent UVLED lamp beads 22, and the inner wall of the groove 231 is an elliptical surface structure; the back of the strip body 21 is provided with a plurality of air bags 28 arranged along the length direction of the strip body 21, and the outer side wall of the air bag 28 is fixedly connected to the back of the strip body 21.

[0041] Furthermore, the transparent waterproof layer 23 is made of LED encapsulation glue. The LED encapsulation glue is preferably a crystal glue specially used for LED flexible light strips produced by Foshan Senmiya Composite Materials Co., Ltd. This encapsulation glue has good light transmittance.

[0042] UVLED lamp beads 22 are ultraviolet light-emitting diodes (UVLEDs). They generate ultraviolet light with a wavelength of 275-280 nm, resulting in high sterilization efficiency. Existing UV light strips, such as those from Shenzhen Biruite Lighting Technology Co., Ltd., are flexible and bendable. By providing a transparent waterproof layer 23, the UVLED light strip is waterproof while ensuring light transmittance, allowing it to be immersed within the metal tank 10. The metal tank 10 is preferably made of stainless steel.

[0043] The float plate 24 is able to float above the surface of the wastewater within the metal tank 10, ensuring that the upper end of the UVLED light strip is pulled up by buoyancy. The lower end of the UVLED light strip is secured by a permanent magnet 25, a spring 26, and an electromagnet 27. When the electromagnet 27 is de-energized and the wastewater within the metal tank 10 does not generate any impact force, the UVLED light strip can be pulled into a vertical configuration. When the electromagnet 27 is energized, it generates a magnetic attraction with the permanent magnet 25. This not only causes the permanent magnet 25 to move downward, compressing the spring 26, but also drives the UVLED light strip and the float plate 24 downward in tandem. Even if the UVLED light strip was previously bent, the tension can straighten it. When the electromagnet 27 is de-energized, the compressed spring 26 releases its elastic force, causing the strip 21 to move upward. Furthermore, the presence of the groove 231, particularly its elliptical surface structure, allows the strip 21 to pre-deform.

[0044] When electromagnet 27 is energized, it generates a repulsive magnetic force against permanent magnet 25, initially causing belt 21 to move upward. During this upward motion, the pre-deformed belt 21 undergoes significant deformation at groove 231, ultimately causing it to bend. Compared to a spherical structure, the ellipsoidal groove 231, particularly one with its major axis parallel to the major axis of the belt 21, has a smaller depth. In contrast, the spherical groove 231 has a greater depth. The drawback of this greater depth is that the corresponding portion of the transparent waterproof layer 23 is less thick.

[0045] The electromagnet 27 intermittently generates a magnetic force that attracts or repels the permanent magnet 25 . The magnetic force that attracts and repels the permanent magnet 25 alternates, with an alternating cycle of 9-16 seconds. During the alternating cycle, the electromagnet 27 is energized for 3-6 seconds, and the rest of the time is de-energized. The details are as follows:

[0046] For example, if the alternating cycle is 10 seconds, the electromagnet 27 is energized for 6 seconds during the alternating cycle. The electromagnet 27 is energized in the interval of (0-6s) to generate a magnetic force attracting the permanent magnet 25, and is deenergized in the interval of (6-10s). This constitutes the first alternating cycle. The electromagnet 27 is energized in the interval of (10-16s) to generate a magnetic force repelling the permanent magnet 25, and is deenergized in the interval of (16-20s). This constitutes the second alternating cycle. Every two alternating cycles constitute one cycle.

[0047] Due to the magnetic force, the UVLED light strip repeatedly bends, straightens, and bends... with the amplitude and bending point of each bend being random. This allows the UVLED lamp beads 22 to continuously move up and down within the metal tank 10, ensuring that the ultraviolet light emitted by the UVLED lamp beads 22 can be directed to more areas within the metal tank 10, thereby minimizing the occurrence of weak light intensity areas and improving sterilization efficiency. In addition, the constant bending and up and down movement of the UVLED light strip will cause a small "stirring" of the sewage nearby, further improving sterilization efficiency.

[0048] The inner wall of the groove 231 is an elliptical surface structure, which can further improve the divergence of ultraviolet rays in this area, so that the ultraviolet rays emitted by the UVLED lamp beads 22 nearby can be directed to more areas inside the metal groove 10, thereby further reducing the generation of weak light intensity areas and further improving the sterilization efficiency.

[0049] A pull cord 30 is fixedly mounted between two adjacent floating plates 24, connecting the floating plates 24 and the pull cord 30 to form a grid-like structure. The pull cord 30 provides a restraining and limiting effect, ensuring that the UV light source assemblies 20 maintain a roughly aligned array even during movement. Furthermore, the periodic undulations ensure that the emitted UV light fills the interior of the metal tank 10 to the greatest extent possible.

[0050] Since the UVLED light strip fluctuates periodically, if the airbag 28 is not provided, especially if the parameters of the airbag 28 are not set according to the following parameters:

[0051] The airbag 28 is made of a transparent material (such as high-pressure polyethylene), and the air pressure inside the airbag 28 is 0.33-0.38 MPa. When the belt 21 is in a vertical state, the volume inside the airbag 28 is x, in cm. 3 The vertical distance between the central axis of the airbag 28 and the bottom of the metal groove 10 is h, in cm; h = 0.013x 2 -y;1133≤y≤2689.

[0052] First, the outer wall of the airbag 28 acts like a convex lens, while the inner wall of the airbag 28 acts like a concave lens. Therefore, a large amount of refraction and reflection occurs within the airbag 28, effectively dispersing the UV light from the airbag 28 and distributing it around the airbag 28. Without the airbag 28, the UVLED light strip would likely bend in the middle section of the strip 21 each time it periodically rises and falls. However, with the airbag 28, there's a high probability of bending in the upper, middle, and lower sections of the strip 21. If bending occurs only in the middle section of the strip 21, only the UVLED beads 22 in that section will be able to disperse the UV light over a wide area. The UV light emitted by the UVLED beads 22 in the upper and lower sections of the strip 21 will have a relatively fixed direction and distribution. This can result in some areas of the metal tank 10 having excessively high UV intensity and others having insufficient intensity, leading to uneven sterilization.

[0053] The ultraviolet rays generated by the UVLED lamp beads 22 treat the sewage inside the metal tank 10, generating free hydroxyl radicals and active oxygen with extremely strong oxidizing ability. It has a strong photo-oxidation-reduction function, can oxidize and decompose various organic compounds and some inorganic substances, can destroy the cell membranes of bacteria and solidify the proteins of viruses, can kill bacteria and decompose organic pollutants, and decompose organic pollutants into pollution-free water and carbon dioxide, thus having extremely strong sterilization, deodorization, mildew prevention, anti-fouling self-cleaning and air purification functions.

[0054] The frequency of the ultrasonic transducer is 23-26kHz. First, the ultrasonic cavitation effect is used for disinfection and sterilization. Under the radiation of ultrasonic waves, the aqueous solution undergoes ultrasonic cavitation effect, which causes the water molecules to split into free radicals such as OH and H, thereby oxidizing the organic matter in the water and entering the bacteria to achieve the effect of sterilization. Secondly, the ultrasonic cavitation operation can also continuously clean the UVLED lamp beads 22 and the transparent waterproof layer 23 to keep them transparent at all times. Considering energy conservation, the ultrasonic transducer can operate intermittently. Within an operating cycle, when the ratio of operating time to stop operating time is 3.2:1, it can retain 98% of the sterilization effect while maximizing energy conservation; and it does not affect its cleaning of the UVLED lamp beads 22 and the transparent waterproof layer 23.

[0055] Example 5

[0056] 5.1. Belt Maximum Deflection Measurement Test

[0057] 5.1.1) An ultrasonic underwater rangefinder (a smart ultrasonic underwater rangefinder from Suzhou Welltech Automation Technology Co., Ltd.) is installed inside the metal tank 10. It has a detection range of 5 meters and a measurement accuracy of 0.1-0.5%. The ultrasonic underwater rangefinder's measuring probe is aligned with the belt 21 and is driven by a pneumatic cylinder to continuously control the height of the ultrasonic underwater rangefinder's measuring probe.

[0058] 5.1.2) Start the UV light source assembly 20 in the same manner as in Example 4, and the ultrasonic transducer at the bottom of the metal tank 10 is in the off state. When the belt body 21 is in the vertical state, the distance between the measuring probe of the ultrasonic underwater rangefinder and the belt body 21 is P n When the belt 21 is in a bent state, the minimum distance between the ultrasonic underwater rangefinder measuring probe and the belt 21 is P min Thus, the maximum offset of the belt 21 is P max =P n -P min To reduce measurement errors, capture P in an alternating cycle. max By measuring multiple times, the arithmetic mean value is obtained to obtain the maximum offset of the belt body 21 measured.

[0059] 5.2 Statistical test of belt bending parts

[0060] The UV light source assembly 20 is activated as described in Example 4, and the ultrasonic transducer at the bottom of the metal tank 10 is turned on. Ten UVLED lamp beads 22 are positioned on the front of the belt body 21. These are spaced evenly apart, with a 30 cm gap between the top and bottom UVLED beads 22. The area between the first and second UVLED beads 22 is labeled A1, the area between the second and third UVLED beads 22 is labeled A2, and so on. The area between the ninth and tenth UVLED beads 22 is labeled A9.

[0061] The maximum deflection of the belt at A1, A2, A3, A4, A5, A6, A7, A8, and A9 is measured using the "Maximum Deflection Measurement Test" to determine whether it is greater than or equal to a threshold value (e.g., 5 cm). The measurement is performed during the blank period when the ultrasonic transducer stops operating. When measuring the maximum deflection, it is necessary to ensure that the electromagnet 27 is not powered off during the alternating cycle. This ensures that the maximum deflection of the belt 21 can be measured without being straightened. Statistics are then generated to determine whether the maximum deflection at A1 to A9 is greater than or equal to the threshold value. When the maximum deflection is greater than or equal to the threshold value, the count at that location is 1; when the maximum deflection is less than the threshold value, the count at that location is 0. Repeat the measurement 100 times.

[0062] 5.3 Sterilization test

[0063] 5.3.1) Collect and select the initial rainwater from a certain location, marked as B0, and measure its performance parameters as shown in Table 1.

[0064] 5.3.2) The initial rainwater (B0) was purified using the rapid initial rainwater treatment method described in Example 4 to obtain purified water (B1). The performance parameters of the purified water (B1) were measured and shown in Table 1.

[0065] Table 1

[0066]

[0067] The values ​​in Table 1 are the average values ​​measured by randomly sampling 10 areas.

[0068] The high-efficiency UV treatment tank in Example 4 was measured according to the "Measurement Test of Maximum Deflection of Belt Body". When the length of the belt body 21 was 2 m, the maximum deflection of the belt body 21 was calculated to be 39.5 cm.

[0069] The high-efficiency UV treatment tank in Example 4 was measured according to the "Statistical Test of the Belt Bending Part", and the results are shown in Table 2.

[0070] Table 2

[0071] area <![CDATA[A1]]> <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[A8]]> <![CDATA[A9]]> frequency 47 58 73 96 100 97 69 62 41

[0072] Example 6

[0073] The difference between this embodiment and embodiment 4 is that in this embodiment, the inner wall of the groove 231 is a spherical surface structure.

[0074] The inner wall of the groove 231 in the fourth embodiment is an elliptical surface structure, and the major axis direction of the ellipse is parallel to the length direction of the belt body 21 when it is vertical.

[0075] When the maximum depth of the grooves 231 is the same, in order to ensure waterproof performance, the distance between two adjacent UVLED lamp beads 22 needs to be set to 43-51 cm>30 cm; therefore, the inner wall of the groove 231 is a spherical surface structure, which is more conducive to the layout of the UVLED lamp beads 22.

[0076] Compared with the spherical structure, when the inner wall of the groove 231 is a spherical surface structure, it is necessary to ensure that the belt body 21 has a sufficiently large maximum offset, and the current required to energize the electromagnet 27 is greater.

[0077] Compared with a spherical surface structure, when the inner wall of the groove 231 is a spherical surface structure, the divergence effect at the groove 231 is better.

[0078] Example 7

[0079] The difference between this embodiment and embodiment 4 is that in this embodiment, no ultrasonic transducer is installed on the bottom of the metal trough.

[0080] This embodiment is measured according to the "Maximum Deflection Measurement Test of the Belt" in Example 5. When the length of the belt is 2m, the calculated maximum deflection of the corresponding belt is 21.5cm, which is much smaller than 39.5cm.

[0081] This example conducted a measurement test according to the "Bactericidal Test" in Example 5, using initial rainwater (B0) as the influent for the purification test, ultimately producing a control purified water (C1). The various performance parameters of the control purified water (C1) were measured, as shown in Table 3.

[0082] Table 3

[0083]

[0084] Example 8

[0085] The difference between this embodiment and embodiment 4 is that the frequency of the ultrasonic transducer in this embodiment varies according to a frequency of 20-40 kHz to measure the corresponding SS, COD values ​​and coliform group parameters.

[0086] Among them, the relationship between SS, COD values ​​and frequency is shown in Figure 4 As the frequency increases, the overall trend of SS and COD values ​​is to decrease first and then increase. The relationship between coliform group values ​​and frequency is shown in Figure 5 The overall trend of coliform bacteria values ​​is a downward trend. Figure 4 and Figure 5 The value of , combined with consideration of energy consumption, the final preferred frequency is 23-26kHz.

[0087] Example 9

[0088] The difference between this embodiment and embodiment 4 is that the electromagnet of this embodiment only generates magnetic force that attracts or repels the permanent magnet, and is not intermittent.

[0089] When the electromagnet of this embodiment only generates a magnetic force that attracts the permanent magnet, measurements are performed according to the "Maximum Deflection Measurement Test of the Belt" in Example 5. When the length of the belt is 2m, after 10 measurements, the maximum deflection of the corresponding belt is calculated to be 0.5±0.5cm.

[0090] When the electromagnet of this embodiment only generates a repulsive magnetic force against the permanent magnet, measurements are performed according to the "Maximum Deflection Measurement Test of the Belt" in Example 5. When the belt length is 2m, after 10 measurements, the corresponding maximum deflection of the belt is calculated as shown in Table 4.

[0091] Table 4

[0092] frequency 1 2 3 4 5 6 7 8 9 10 Maximum offset (cm) 38.7 41.9 47.8 56.5 66.1 73.7 80.7 81.2 80.9 81.1

[0093] According to Table 4, if only repulsive force exists, the belt will become flatter and flatter, and eventually approach a "folded in half" state, and the belt will not restore its vertical structure, which is not conducive to the divergence of ultraviolet rays inside the metal slot.

[0094] In contrast, the electromagnet 27 of Example 4 intermittently generates a magnetic force that attracts or repels the permanent magnet 25. The magnetic force that attracts and repels the permanent magnet 25 alternates over a period of 9-16 seconds. During this period, the electromagnet 27 is energized for 3-6 seconds, with the remainder being de-energized. This ensures that even if the belt 21 is bent, the attractive magnetic force quickly returns to its original shape. Furthermore, the next bending position and degree are random, rather than being concentrated in the middle of the belt 21.

[0095] Example 10

[0096] The difference between this embodiment and embodiment 4 is that the airbag 28 is not provided in this embodiment.

[0097] This embodiment is measured according to the "Measurement Test of Maximum Deflection of Belt Body" in Example 5. When the length of the belt body is 2m, the calculated maximum deflection of the corresponding belt body is 31.5cm, which is less than 39.5cm.

[0098] The high-efficiency UV treatment tank without the airbag 28 in this embodiment was measured according to the "Statistical Test of the Belt Bending Part", and the results are shown in Table 5.

[0099] Table 5

[0100] area <![CDATA[A1]]> <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[A8]]> <![CDATA[A9]]> frequency 0 2 31 100 100 100 35 4 0

[0101] This example was tested according to the "Bactericidal Test" in Example 5. Initial rainwater (B0) was used as the influent for purification, ultimately producing control purified water (C2). Ten samples of the control purified water (C2) were collected from various areas of the metal tank and their coliform counts were measured. The results are shown in Table 6.

[0102] Table 6

[0103] Sample number Coliform group (pieces / L) No. 1 70±5 No. 2 220±10 No. 3 1350±50 No. 4 700±10 No. 5 3700±100 No. 6 90±5 No. 7 85±5 No. 8 2050±50 No. 9 630±10 No. 10 350±10

[0104] Example 11

[0105] The difference between this embodiment and embodiment 4 is that the airbag 28 is also provided in this embodiment, but the volumes inside the airbag 28 are equal.

[0106] This embodiment is measured according to the "Maximum Deflection Measurement Test of the Belt" in Example 5. When the length of the belt is 2m, the calculated maximum deflection of the corresponding belt is 33.5cm, which is less than 39.5cm.

[0107] The high-efficiency UV treatment tanks containing airbags 28 of equal volume in this embodiment were measured according to the "Statistical Test of the Belt Bending Part", and the results are shown in Table 7.

[0108] Table 7

[0109] area <![CDATA[A1]]> <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[A8]]> <![CDATA[A9]]> frequency 1 15 39 100 100 100 47 11 0

[0110] This example was tested according to the "Bactericidal Test" in Example 5. Initial rainwater (B0) was used as the influent for the purification test, ultimately producing control purified water (C3). The control purified water (C3) was sampled 10 times from various areas of the metal tank and its coliform counts were measured. The results are shown in Table 8.

[0111] Table 8

[0112]

[0113]

[0114] Example 12

[0115] The difference between this embodiment and embodiment 4 is that in this embodiment, the UVLED lamp tube of Lianyungang Shuoyue Optoelectronics Technology Co., Ltd. is used, and its total power is the same as the total power of the UVLED light strip in embodiment 4, and the volume of the metal tank is 33m 3 The volume of sewage inside the metal tank is 28m 3 .

[0116] The disinfection method of Example 4 was used, and samples were taken from each area after 2 hours and 15 minutes, with a total of 33 samples taken. The final measured coliform group concentration was <50 / L.

[0117] Using the disinfection method of this embodiment, samples were taken from each area after 5 hours and 5 minutes, with a total of 33 samples taken. The final measured coliform group concentration was <50 cells / L.

[0118] Because the existing UVLED lamp tube, even with the assistance of ultrasonic cleaning dispersion technology, has some "blind corners" inside the metal tank due to the divergent ultraviolet light it emits, the ultraviolet light in these "blind corners" is weak and the sterilization efficiency is slow, and it takes a longer time of ultraviolet irradiation to completely sterilize.

[0119] In the above-mentioned embodiments, the rapid initial rainwater treatment method of the present invention can rapidly purify initial rainwater, contributing to the cleanliness of water entering the river. Compared with traditional technologies such as dosing, magnetic treatment, and membrane treatment, the present invention offers the advantage of greater efficiency. By utilizing rapid electrolytic coagulation and electrocatalysis, combined with UV light of a specific wavelength for organic matter and bacterial colony control, the present invention improves key indicators of effluent quality, particularly the sensory properties of the water.

[0120] The present invention kills microorganisms, bacteria, algae, and plankton in the water and then removes them. It also rapidly oxidizes and decomposes ammonia nitrogen in the wastewater, causing chain or ring scission of the chromogenic groups of colored substances, oil stains, and other organic matter in the wastewater, thereby decolorizing the wastewater. It also oxidizes and decomposes odor-producing groups in the wastewater, removing the malodor.

[0121] Analysis of Table 1 shows that the present invention can quickly purify initial rainwater, wherein the SS removal rate in the initial rainwater reaches 97.6%, the COD removal rate reaches 96.8%, the BOD5 removal rate reaches 72.7%, and the NH3-N removal rate reaches 80.2%. The chromaticity can be significantly improved and the turbidity can be reduced. The high-efficiency UV treatment tank has a disinfecting effect on the coliform group.

[0122] A comparative analysis of Tables 1 and 3 reveals that, while the performance parameters of initial rainwater B0, purified water B1, and control purified water C1 are significantly better than those of initial rainwater B0, the control purified water C1 is significantly worse than purified water B1. A comparison of Example 7 with Example 4 shows that not installing an ultrasonic transducer at the bottom of the metal trough not only limits the maximum deflection of the belt but also restricts further improvements in water quality. In other words, the implementation of ultrasonic dispersion technology not only further enhances water purification but also allows the ultraviolet light emitted by the UVLED lamp beads 22 to be more fully dispersed within the metal trough, resulting in a more uniform ultraviolet sterilization effect and a reduced sterilization time.

[0123] A comparative analysis of Examples 4 and 10 shows that, without the airbag 28, not only would the maximum deflection of the belt be limited, but the belt's bending deformation would also be concentrated in the middle of the belt under the intermittent magnetic force. This is evident from Table 5, where A4-A6 exhibit 100% bending deformation, while A1, A2, A8, and A9 at the ends experience almost no bending deformation. Even A3 and A7 near the ends exhibit only a 30% chance of bending deformation. Because the deformation is mostly concentrated in the middle of the belt, the UV light emitted by the UVLED lamps 22 on the belt no longer scatters randomly. Instead, the UV intensity is limited in some blind spots, resulting in a significantly lower sterilization effect in these blind spots than in other areas. This is further confirmed by Table 6, which shows that 10 samples were taken from different areas. The best area exhibited a residual bacterial concentration of 70 ± 5 cells / L, while the worst area exhibited a concentration of 3700 ± 100 cells / L. This shows that the provision of the airbag 28 will cause a large amount of refraction and reflection in the vicinity thereof, thereby increasing the ultraviolet divergence effect in the region and facilitating the divergence of the ultraviolet rays to the surrounding areas of the airbag 28, thereby increasing the sterilization effect of the ultraviolet rays.

[0124] A comparative analysis of Examples 10 and 11 reveals that, while Example 11 incorporates airbags 28, the internal volume of each airbag 28 is conventionally equalized. Consequently, under the intermittent magnetic force, the belt's bending deformation is largely concentrated in the middle section. This is evident in Table 7, where A4-A6 exhibit 100% bending deformation, while A1 and A9 at the ends experience almost no bending deformation. Compared to Example 10, the bending deformation rates of A2, A3, A7, and A8 in Example 11 are significantly higher, but still significantly lower than the corresponding data in Table 2.

[0125] Because the airbag 28 at the corresponding position will vibrate with a large amplitude under the action of ultrasonic vibration, the airbag 28 at the corresponding position will vibrate with a large amplitude under the drive of the vibration.

[0126] If the ratio between the volume inside the airbag 28 and the corresponding height at the corresponding position is not controlled, the area where the belt 21 bends will become larger and no longer be concentrated in the middle of the belt 21. The ends of the belt 21 and the surrounding areas will also experience significant bending deformation. This helps to more flexibly direct the UVLED beads 22 on the belt 21 in all directions, allowing the emitted ultraviolet light to spread across a wider range and without blind spots into the interior of the metal tank 10. This results in a more uniform distribution of ultraviolet light within the metal tank 10 and a more uniform and effective sterilization effect, as can be seen by comparing Tables 1, 8, and 6. Strictly controlling the ratio between the volume inside the airbag 28 and the corresponding height at the corresponding position, combined with the buoyancy factor applied to the airbag 28, ensures that the vibration force and amplitude generated by the airbag 28 at different heights under ultrasonic vibration vary, thereby increasing the probability of bending deformation at the ends of the belt 21 and the surrounding areas.

[0127] It can be seen from Example 12 that the high-efficiency UV treatment tank of the present invention has high ultraviolet sterilization efficiency and can quickly sterilize and disinfect sewage.

[0128] The design treatment water volume of the initial rainwater rapid treatment method of the present invention is 300m 3 / d, with high purification efficiency and good purification effect.

[0129] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for rapid treatment of initial rainwater, characterized by: The initial rainwater is discarded and collected into the inlet channel through the sewage collection network. The water in the inlet channel is treated by mechanical coarse and fine screens to obtain pre-treated sewage. The pre-treated sewage is then treated in sequence by a grit chamber, oil removal tank, electrolytic flocculation reaction tank, electrolytic catalytic oxidation tank, and high-efficiency UV treatment tank before being discharged in compliance with the standards. The high-efficiency UV treatment tank includes a metal tank, an ultrasonic transducer is installed at the bottom of the metal tank, and a UV light source assembly is arranged in an array inside the metal tank. The UV light source assembly includes a floating plate, a UVLED light strip, a permanent magnet, a spring, and an electromagnet in order from top to bottom. The upper end of the UVLED light strip is fixedly connected to the lower part of the floating plate, the lower end of the UVLED light strip is fixedly connected to the upper end of the permanent magnet, the lower end of the permanent magnet is fixedly connected to the upper end of the spring, the lower end of the spring is fixedly connected to the upper end of the electromagnet, and the lower end of the electromagnet is fixedly connected to the bottom of the metal tank; the UVLED light strip includes a belt body, a plurality of UVLED lamp beads installed on the front of the belt body, the UVLED lamp beads are hemispherical in structure, and the surface of the belt body is provided with a transparent waterproof layer; the UVLED lamp beads are arranged at equal intervals, and a groove is provided on the front of the transparent waterproof layer between two adjacent UVLED lamp beads, and the inner wall of the groove is an elliptical surface structure; the back of the belt body is provided with a plurality of air bags arranged along the length direction of the belt body, and the outer side walls of the air bags are fixedly connected to the back of the belt body; The electromagnet intermittently generates magnetic forces that attract or repel the permanent magnet. The magnetic forces that attract and repel the permanent magnet appear alternately, with an alternating cycle of 9-16 seconds. The electromagnet is energized for 3-6 seconds during the alternating cycle, and the rest is de-energized time.

2. The method for rapid treatment of initial rainwater according to claim 1, characterized in that: The transparent waterproof layer is made by encapsulating and sealing the LED encapsulation glue.

3. The method for rapid treatment of initial rainwater according to claim 1, characterized in that: The frequency of the ultrasonic transducer is 23-26 kHz.

4. The method for rapid treatment of initial rainwater according to claim 1, wherein: A pull rope is fixedly installed between two adjacent floating plates, and the floating plates and the pull rope are connected to form a grid structure.

5. The method for rapid treatment of initial rainwater according to claim 1, characterized in that: The bar spacing of the mechanical coarse grid is 16-30 mm, and the bar spacing of the mechanical fine grid is 1.5-2 mm.

6. The method for rapid treatment of initial rainwater according to claim 1, characterized in that: The anode in the electrolytic flocculation reaction cell is an anode iron plate with a nano-coating, wherein the nano-coating is titanium dioxide with a grain size of 15-50 nm. The cathode in the electrolytic flocculation reaction cell is an iron cathode plate. The pH value of the electrolytic flocculation reaction cell is adjusted to 5-6 before the electrolytic reaction. The operating voltage between the anode and the cathode is 3.5-7.2 V, and the current density is 66-130 mA / cm 2 .

7. The method for rapid treatment of initial rainwater according to claim 1, characterized in that: The electrode plates in the electrolytic catalytic oxidation tank are made of stainless steel or graphite, and the distance between the electrode plates is 13-18 cm. An aeration head is installed at the bottom of the electrolytic catalytic oxidation tank to aerate the inside of the electrolytic catalytic oxidation tank. The flow rate of aeration into the electrolytic catalytic oxidation tank is 0.8-1 m 3 / h, a catalyst filling area is provided in the middle of the electrolytic catalytic oxidation tank, and the catalyst filling used in the catalyst filling area is a composite molecular sieve with a particle size of 0.35-5.5 mm, and the composite molecular sieve is made of molecular sieve loaded with neodymium oxide. The filling volume of the catalyst filling in the catalyst filling area is 55%, and the current density between the anode and the cathode is 2.2-3.5 mA / cm 2 .

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