Purification device and method for decoloring and reducing ammonia nitrogen and COD of sewage

Abstract

The present application relates to sewage treatment technical field, especially sewage decolorization and reduce ammonia nitrogen, COD's purification device and method. Including casing, partition, electric control water inlet valve, ozone module, aeration release mechanism, electric control flow guide pipe, gas-liquid circulation mechanism, water distribution mechanism, backflow mechanism, deslagging mechanism and electric control liquid outlet valve. The present application generates high concentration ozone gas through ozone module, is cut by micro-porous titanium plate aeration disc in aeration release mechanism, forms the mixed solution of rich ozone nanoscale micro-bubble, uses the strong oxidizability of ozone itself to the color group in sewage carries out preliminary oxidation. Subsequently, the venturi jet in the gas-liquid circulation mechanism is driven under the circulation water pump, and the mixed solution containing ozone micro-bubble in the reaction zone is inhaled at high speed, and the throat generates intense cavitation effect and strong shear force, further breaks the original micro-bubble, makes the bubble diameter smaller, the quantity density significantly improves, and forms the supersaturated nanoscale micro-bubble ozone water.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a purification device and method for decolorizing wastewater and reducing ammonia nitrogen and COD. Background Technology

[0002] With the continuous increase in the intensification of animal husbandry in my country, the daily volume of high-concentration organic wastewater discharged from farms is enormous. Taking a pig farm with 10,000 pigs as an example, its daily discharge of manure can reach 50 to 200 cubic meters, with chemical oxygen demand (COD) concentration soaring to 4,000 to 15,000 mg / L and ammonia nitrogen concentration reaching 200 to 1,600 mg / L. The organic matter, pathogens, and nitrogen and phosphorus loads carried in this type of wastewater far exceed those of ordinary domestic sewage, significantly increasing the difficulty of treatment. If discharged without effective purification, it can easily induce a chain of environmental disasters such as eutrophication of water bodies, nitrate pollution of groundwater, and degradation of soil function.

[0003] Currently, the mainstream treatment pathways for livestock and poultry farming wastewater face significant limitations. While returning wastewater to the fields can absorb some pollutants, it is constrained by land carrying capacity and easily leads to crop root burn and soil compaction. Natural treatment methods occupy vast amounts of land, and their purification efficiency is highly unstable due to seasonal variations. Biological anaerobic fermentation processes have long been hampered by bottlenecks such as sluggish electron transfer between microbial communities and the inhibitory effect of high-concentration ammonia nitrogen, resulting in unsatisfactory substrate conversion rates. Even conventional combined anaerobic and aerobic processes face the dilemma of requiring external carbon sources, fluctuating nitrogen removal efficiency, and high operation and maintenance costs.

[0004] In advanced treatment stages, ozone oxidation technology stands out due to its strong oxidation potential. In recent years, technical solutions coupling ozone micro / nanobubble technology with electrochemical oxidation processes have been disclosed. For example, patent CN223316466U discloses a water treatment device that couples ozone micro / nanobubble technology with electrochemical oxidation, and combines it with a BDD electrode unit to generate a synergistic effect. This device utilizes jet impact force to flush the BDD electrode plate to prevent clogging. However, this device still has the following shortcomings: 1. Micro-nano bubbles are generated only once by a Venturi jet injector, and the number and density of bubbles are limited, so there is still room for improvement in gas-liquid mass transfer efficiency. 2. The wastewater retention time inside the device is relatively short, resulting in insufficient contact between pollutants and the oxidant; 3. The device does not have a circulation reflux structure, making it difficult to achieve repeated oxidation of wastewater.

[0005] 4. The clear water tank is located independently and externally, resulting in low overall integration. The functional units are relatively scattered, and the area occupied is large.

[0006] Therefore, there is an urgent need to develop a wastewater decolorization and ammonia nitrogen and COD reduction device and method with a compact structure, high treatment efficiency and high ozone utilization rate, so as to achieve efficient decolorization of wastewater and deep reduction of ammonia nitrogen and COD. Summary of the Invention

[0007] To overcome the shortcomings of existing livestock and poultry breeding wastewater treatment devices, such as low ozone utilization, low generation of nano-microbubbles, inability to effectively increase bubble density, incomplete oxidation reaction, and dispersed and poorly integrated functional units, this invention provides a wastewater decolorization and purification device and method for reducing ammonia nitrogen and COD. The technical solution of this invention is: a wastewater decolorization and ammonia nitrogen and COD reduction purification device, comprising a shell, a partition, an electrically controlled inlet valve, an ozone module, an aeration and release mechanism, an electrically controlled guide pipe, a gas-liquid circulation mechanism, a water distribution mechanism, a reflux mechanism, a sludge removal mechanism, and an electrically controlled outlet valve. A horizontal partition is connected to the lower part of the shell, dividing the shell cavity into upper and lower chambers. The upper chamber is the wastewater zone, and the lower chamber is the reaction zone. An electrically controlled inlet valve is connected to the top of the shell. The aeration and release mechanism is installed in the lower part of the reaction zone and connected to the ozone module via a pipeline. An electrically controlled guide pipe is installed through the partition, with its lower end extending into the reaction zone. A gas-liquid circulation mechanism is installed on one side of the shell. A water distribution mechanism is located in the lower part of the wastewater zone and is connected to the gas-liquid circulation mechanism. A reflux mechanism is installed on the other side of the shell, connecting the wastewater zone and the reaction zone. A sludge removal mechanism is located at the top of the shell, and an electrically controlled outlet valve is connected to the bottom of the shell.

[0008] Preferably, the aeration release mechanism includes a connecting pipe, an air distribution ring pipe, an aeration disc, an air distribution main pipe, and an electrically controlled regulating valve. At least two connecting pipes are provided at the bottom of the housing, and multiple air distribution ring pipes are connected between the tops of the connecting pipes. Each air distribution ring pipe is provided with multiple aeration discs. One of the air distribution ring pipes is connected to the electrically controlled regulating valve through the air distribution main pipe, and the air distribution main pipe is connected to the ozone module through the electrically controlled regulating valve via a pipeline.

[0009] Preferably, the gas-liquid circulation mechanism includes a circulating water pump, a first inlet pipe, a Venturi jet injector, a first outlet pipe, and an air inlet pipe. The circulating water pump is installed on the outer wall of the shell. The liquid inlet end of the circulating water pump is connected to the first inlet pipe, which penetrates into the reaction zone inside the shell. The liquid outlet end of the circulating water pump is connected to the inlet of the Venturi jet injector. The liquid outlet end of the Venturi jet injector is connected to the first outlet pipe, which penetrates into the sewage zone inside the shell and is connected to the water distribution mechanism. The air inlet end of the Venturi jet injector is connected to an air inlet pipe.

[0010] Preferably, the gas-liquid circulation mechanism also includes an air filter and a one-way valve. The air filter is connected to the air inlet end of the air inlet pipe, and a one-way valve is installed at the bottom of the air inlet pipe. The one-way valve only allows gas to flow from the outside to the air inlet pipe in one direction.

[0011] Preferably, the water distribution mechanism includes a connecting rod, a fixed water guide plate, a movable water guide plate, water distribution pipes, and a drive assembly. The connecting rod, located in the sewage zone, is connected to the inner wall of the housing. The other end of the connecting rod is connected to a fixed water guide plate, which is connected to the first water outlet pipe. The movable water guide plate is rotatably connected to the fixed water guide plate in a sealed manner. At least two water distribution pipes are connected to the movable water guide plate at equal intervals around its circumference. A drive assembly is installed on the top of the partition plate, which is used to drive the movable water guide plate to rotate.

[0012] Preferably, the reflux mechanism includes a reflux pump, a second inlet pipe, and a second outlet pipe. The reflux pump is installed on the outer wall of the housing. The inlet end of the reflux pump is connected to the second inlet pipe, which penetrates into the housing and extends to the upper middle part of the sewage zone. The outlet end of the reflux pump is connected to the second outlet pipe, which penetrates into the housing and extends into the reaction zone.

[0013] Preferably, the slag removal mechanism includes a guide frame, a guide block, a float ring, a connecting frame, a slag suction pipe, a slag discharge hose, and a slag discharge hard pipe. At least two guide frames are connected to the upper part of the shell. Each guide frame has a sliding guide block. A float ring is connected between the guide blocks. A connecting frame is provided inside the float ring. A slag suction pipe is connected to the bottom of the connecting frame. A slag discharge hose is connected to the bottom of the slag suction pipe. A slag discharge hard pipe is connected to the end of the slag discharge hose away from the slag suction pipe. The slag discharge hard pipe extends out of the side wall of the shell.

[0014] Preferably, the system also includes a control system, an ozone concentration sensor, a high water level sensor, and a low water level sensor. The high water level sensor and the low water level sensor are respectively installed in the upper and lower parts of the housing, and the ozone concentration sensor is installed in the lower part of the housing, close to the inlet of the first water inlet pipe. The high water level sensor, the low water level sensor, the ozone concentration sensor, the electrically controlled flow guide pipe, the electrically controlled regulating valve, the electrically controlled inlet valve, and the electrically controlled outlet valve are all electrically connected to the control system.

[0015] The treatment method for wastewater decolorization and purification devices that reduce ammonia nitrogen and COD includes the following steps: S1: Control the opening of the electrically controlled inlet valve, allowing the wastewater to enter the wastewater zone. The wastewater then flows into the reaction zone through the electrically controlled guide pipe. Close the electrically controlled guide pipe. S2: Start the ozone module, and cut ozone gas into micro-nano-scale bubbles through the aeration and release mechanism and dissolve them into the wastewater in the reaction zone to form an ozone microbubble mixture. S3: The ozone concentration sensor detects the ozone concentration in the reaction zone in real time and feeds it back to the control system. The control system controls the opening of the electronic control valve according to the set threshold, and adjusts the amount of gas supplied by the ozone module to the aeration release mechanism so that the ozone concentration in the reaction zone is maintained within the preset range. S4: Start the circulating water pump to draw and pressurize the ozone microbubble mixture in the reaction zone and send it into the Venturi jet. Air is drawn in through the air inlet pipe. In the Venturi jet, the cavitation effect and shear force of the high-speed liquid flow are used to break and mix the gas and liquid phases to form high-density nano-microbubble ozonated water, which is then injected back into the sewage area through the water distribution mechanism. S5: Start the reflux pump to draw the upper layer of sewage in the sewage zone through the second inlet pipe and then send it into the reaction zone through the second outlet pipe. S6: Start the slag removal mechanism to suck the slag that has accumulated on the liquid surface into the slag suction pipe and discharge it through the slag discharge hose and slag discharge hard pipe; S7: After the treatment meets the standards, control the electronically controlled liquid outlet valve to open.

[0016] This invention has the following advantages: 1. This invention generates high-concentration ozone gas through an ozone module. This ozone gas is then cut by a microporous titanium plate aeration disc in the aeration release mechanism to form an ozone-rich nano-scale microbubble mixture. The strong oxidizing properties of ozone are used to initially oxidize the chromophores in the wastewater. Subsequently, a Venturi jet in the gas-liquid circulation mechanism, driven by a circulating water pump, rapidly draws the ozone-containing microbubble mixture from the reaction zone. This generates a strong cavitation effect and shear force at the throat, further breaking down the existing microbubbles, resulting in smaller bubble diameters and a significantly increased number of bubbles, forming supersaturated nano-microbubble ozonated water. This process strengthens the gas-liquid mass transfer interface through physical disruption, utilizing the hydroxyl radicals released when the micro-nano bubbles break down to synergistically oxidize with ozone, rapidly decomposing the chromophores in the wastewater, thereby efficiently removing the color from the wastewater.

[0017] 2. This invention continuously pumps substandard wastewater back to the reaction zone via a reflux mechanism, forming a closed-loop circulation flow between the reaction zone and the wastewater zone. This effectively prolongs the residence time of pollutants in the reaction zone, avoids short-circuiting, and significantly improves the removal efficiency of ammonia nitrogen, COD, and color. Simultaneously, an electrically controlled regulating valve controls the ozone gas flow rate, and an ozone concentration sensor monitors the dissolved ozone concentration in the reaction zone in real time. The control system adjusts the opening of the electrically controlled regulating valve accordingly to ensure sufficient oxidation capacity within the reaction zone. Furthermore, the number density of ozone microbubbles is primarily controlled by adjusting the rotational speed of the circulating water pump. These two mechanisms work synergistically to ensure a thorough oxidation reaction.

[0018] 3. This invention is equipped with a high-level water sensor, a low-level water sensor, and an ozone concentration sensor, all electrically connected to the control system. When the liquid level reaches the high-level water sensor position, the control system closes the electrically controlled inlet valve. When the liquid level reaches the low-level water sensor position, the control system closes the electrically controlled outlet valve and opens the electrically controlled inlet valve, achieving fully automatic control of water inlet and outlet. This invention features a compact and modular design, making it directly applicable to livestock manure treatment facilities and also suitable for treating other high-concentration organic wastewater, demonstrating broad application prospects and market potential. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic cross-sectional view of the housing structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the aeration and release mechanism of the present invention.

[0022] Figure 4 This is a schematic diagram of the gas-liquid circulation mechanism and water distribution mechanism of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the partition and drive assembly of the present invention.

[0024] Figure 6 This is a schematic diagram of the reflux mechanism of the present invention.

[0025] Figure 7 This is a schematic diagram of the slag removal mechanism of the present invention.

[0026] The following are the meanings of the reference numerals in the diagram: 1: Shell, 2: Baffle, 3: Wastewater zone, 4: Reaction zone, 5: Electrically controlled inlet valve, 6: Ozone module, 7: Aeration release mechanism, 71: First pipe clamp, 72: Connecting pipe, 73: Air distribution ring pipe, 74: Aeration disc, 75: Main air distribution pipe, 76: Electrically controlled regulating valve, 8: Electrically controlled guide pipe, 9: Gas-liquid circulation mechanism, 91: Mounting bracket, 92: Circulating water pump, 93: First inlet pipe, 94: Venturi jet injector, 95: First outlet pipe, 96: Air inlet pipe, 97: Air filter, 98: Check valve, 10: Water distribution mechanism, 101: Second pipe clamp, 102: Connecting... Connecting rod, 103: Fixed water guide plate, 104: Movable water guide plate, 105: Water distribution pipe, 106: Drive assembly, 1061: Servo motor, 1062: Large gear, 1063: Small gear, 11: Recirculation mechanism, 111: Recirculation pump, 112: Second water inlet pipe, 113: Second water outlet pipe, 12: Slag removal mechanism, 121: Guide frame, 122: Guide block, 123: Float ring, 124: Connecting frame, 125: Slag suction pipe, 126: Slag discharge hose, 127: Slag discharge rigid pipe, 13: Electrically controlled liquid outlet valve, 14: Ozone concentration sensor, 15: High water level sensor, 16: Low water level sensor. Detailed Implementation

[0027] Although the invention may be described with respect to specific applications or industries, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0028] Example 1: Wastewater decolorization and ammonia nitrogen and COD reduction purification device, such as Figures 1-7As shown, the system includes a shell 1, a partition 2, a wastewater zone 3, a reaction zone 4, an electrically controlled inlet valve 5, an ozone module 6, an aeration and release mechanism 7, an electrically controlled guide pipe 8, a gas-liquid circulation mechanism 9, a water distribution mechanism 10, a reflux mechanism 11, a sludge removal mechanism 12, and an electrically controlled outlet valve 13. A horizontal partition 2 is fixedly connected to the lower part of the shell 1, dividing the inner cavity of the shell 1 into two independent chambers with a gradient in volume. The volume ratio of the two chambers is 10:1. The upper chamber is the wastewater zone 3, used for temporarily storing wastewater and performing air flotation separation of suspended solids and scum in the wastewater. The lower chamber is the reaction zone 4, used to generate high-concentration... The ozone nano-microbubbles oxidize wastewater. The shell 1 has a cover on top, and flanges are located on the upper outer side of the shell 1 and the lower outer side of the cover, respectively. These flanges are fixed together with flange bolts to achieve a sealed assembly between the shell 1 and the cover. An electrically controlled inlet valve 5 is connected to the center of the top of the cover to control wastewater inflow. An observation window is located on the top of the cover; the window can be opened and closed for easy maintenance of the sludge removal mechanism 12. An aeration release mechanism 7 is installed in the lower part of the reaction zone 4 and is connected to an external ozone module 6 via a pipeline. After the ozone module 6 is activated, it uses the high-voltage corona discharge principle to release oxygen... The ozone gas is converted into high-purity ozone gas and forcibly dissolved into the wastewater in reaction zone 4 through aeration and release mechanism 7. Simultaneously, aeration and release mechanism 7 cuts, disperses, and compresses the ozone gas into clusters of tiny bubbles, forming a nano-sized microbubble mixture rich in ozone. An electrically controlled guide pipe 8 is installed through the partition 2, with its lower end extending into reaction zone 4. A gas-liquid circulation mechanism 9 is installed on the left side of the shell 1. A water distribution mechanism 10 is located at the lower part of wastewater zone 3, connected to the gas-liquid circulation mechanism 9. The gas-liquid circulation mechanism 9 is used to transport the ozone-reacted wastewater from reaction zone 4 into wastewater zone 3, and during the transport process… During the process, gas-liquid enhanced mixing is carried out to form high-density nano-microbubble ozonated water. The high-density nano-microbubble ozonated water is injected back into the sewage zone 3 through the water distribution mechanism 10. A return mechanism 11 is installed on the right side of the shell 1. The return mechanism 11 connects the sewage zone 3 and the reaction zone 4 and is used to pump the sewage in the upper layer of the sewage zone 3 to the reaction zone 4. A slag removal mechanism 12 is set at the top inside the shell 1. The slag removal mechanism 12 is used to transport the scum accumulated on the liquid surface to the outside of the shell 1, thereby separating solid pollutants from the water. An electrically controlled liquid outlet valve 13 is connected to the bottom of the shell 1. The electrically controlled liquid outlet valve 13 is used to discharge clean water after the treatment meets the standards.

[0029] When wastewater needs treatment, the wastewater pipe is connected to the electrically controlled inlet valve 5. The electrically controlled inlet valve 5 and the electrically controlled guide pipe 8 are opened, allowing the wastewater to enter both the upper wastewater zone 3 and the lower reaction zone 4 of the shell 1. After a suitable amount of wastewater is injected into both chambers, the electrically controlled guide pipe 8 is closed, isolating the wastewater zone 3 from the reaction zone 4. Then, the ozone module 6 is activated. The high-concentration ozone gas generated by the ozone module 6 is forcibly dissolved into the wastewater through the aeration release mechanism 7, forming a mixture rich in ozone nanobubbles. This mixture oxidizes and decomposes ammonia nitrogen, COD, and color in the wastewater. Simultaneously, the gas-liquid circulation mechanism 9 draws in the water containing ozone microbubbles from the reaction zone 4 and intensifies the mixing. This mixture is then sprayed back into the wastewater zone 3 through the water distribution mechanism 10, further promoting contact and oxidation between the bubbles and pollutants. The return flow mechanism 11 pumps the upper layer of wastewater from the wastewater zone 3 to the reaction zone 4 for circulation treatment. The sludge removal mechanism 12 periodically transports the scum accumulated on the liquid surface to the outside of the shell 1, achieving solid-liquid separation. After the wastewater treatment meets the standards, the electrically controlled discharge valve 13 and the electrically controlled guide pipe 8 are opened, and the clean water in the wastewater zone 3 and the reaction zone 4 is discharged through the electrically controlled discharge valve 13.

[0030] Example 2: Based on Example 1, such as Figure 2 and Figure 3 As shown, the aeration release mechanism 7 includes a first pipe clamp 71, a connecting pipe 72, an air distribution ring pipe 73, an aeration disc 74, an air distribution main pipe 75, and an electrically controlled regulating valve 76. Six sets of first pipe clamps 71 are evenly spaced circumferentially at the bottom of the housing 1. Each set of first pipe clamps 71 has two clamps, and the two clamps in the same set jointly clamp a connecting pipe 72. Five air distribution ring pipes 73 are connected together at the top of the six connecting pipes 72. The five air distribution ring pipes 73 are evenly distributed concentrically from the outside to the center. Multiple aeration discs 74 are evenly spaced at the top of each air distribution ring pipe 73. In this embodiment, the aeration disc 74 is a microporous titanium plate aeration disc, made by sintering titanium powder, with a uniformly distributed surface. The system is equipped with micropores with a pore size of 5μm to 10μm. The outermost gas distribution ring pipe 73 is connected to a gas distribution main pipe 75, which is sealed and penetrates the housing 1. The other end of the gas distribution main pipe 75 is connected to an electrically controlled regulating valve 76. The gas distribution main pipe 75 is connected to the ozone module 6 through the electrically controlled regulating valve 76 via a pipeline. During operation, the high-concentration ozone gas generated by the ozone module 6 enters each gas distribution ring pipe 73 through the gas distribution main pipe 75, and is then evenly released into the water body of the reaction zone 4 by multiple aeration discs 74. The micropores cut the ozone gas into a large number of micro-nano-scale bubbles, which significantly increases the gas-liquid contact area and mass transfer efficiency, and avoids local bubble accumulation or dead zone phenomena. The electrically controlled regulating valve 76 is used to control the ozone gas flow rate.

[0031] After ozone module 6 is activated, it generates high-purity ozone gas through high-voltage corona discharge. This gas enters the main gas distribution pipe 75 via the electronically controlled regulating valve 76, and is then distributed to five gas distribution ring pipes 73. The microporous titanium plate aeration discs on the gas distribution ring pipes 73 cut the ozone gas into a large number of nano-sized microbubbles, which are evenly released into the water body of reaction zone 4, avoiding bubble accumulation and dead zones, and significantly increasing the gas-liquid contact area and mass transfer efficiency. By adjusting the opening of the electronically controlled regulating valve 76, the ozone gas flow rate can be controlled to keep the ozone microbubble concentration in reaction zone 4 stably maintained above 30 ppm, ensuring that the oxidation reaction proceeds fully.

[0032] Example 3: Based on Example 2, such as Figure 2 and Figure 4 As shown, the gas-liquid circulation mechanism 9 includes a mounting bracket 91, a circulating water pump 92, a first water inlet pipe 93, a Venturi jet injector 94, a first water outlet pipe 95, and an air inlet pipe 96. The mounting bracket 91 is fixed to the lower left side of the housing 1, and the circulating water pump 92 is mounted on the top of the mounting bracket 91. The liquid inlet end of the circulating water pump 92 is connected to the first water inlet pipe 93. The first water inlet pipe 93 passes through the reaction zone 4 inside the housing 1 and extends to the lower middle part of the reaction zone 4 to ensure that the circulating water pump 92 can continuously... The circulating water pump 92 continues to draw in a mixture rich in ozone microbubbles. The outlet of the circulating water pump 92 is connected to the inlet of the Venturi jet 94 through a pipe. The outlet of the Venturi jet 94 is connected to a first outlet pipe 95. The first outlet pipe 95 passes through the sewage area 3 inside the housing 1 and is connected to the water distribution mechanism 10. The air inlet of the Venturi jet 94 is connected to an air inlet pipe 96. The upper end of the air inlet pipe 96 is higher than the liquid level inside the housing 1 to prevent backflow of liquid and overflow from the air inlet pipe 96 when the pump stops.

[0033] During operation, the circulating water pump 92 starts, drawing in and pressurizing the mixture containing ozone microbubbles in reaction zone 4, forming a high-speed liquid flow that is sent into the Venturi ejector 94. When the high-speed liquid flow passes through the throat of the Venturi ejector 94, the flow velocity increases sharply and the static pressure drops significantly, forming a negative pressure zone. This allows air to be automatically drawn in through the air inlet pipe 96. Because the upper end of the air inlet pipe 96 is higher than the liquid level inside the casing 1, even if the circulating water pump 92 stops operating, the liquid in reaction zone 4 cannot flow back through the ejector to the outlet of the air inlet pipe 96, effectively preventing liquid overflow accidents. The drawn-in air and the high-speed liquid flow are concentrated in the throat and diffuser... In the dispersed section, intense turbulent mixing occurs, and the ozone is sheared and broken into a large number of nanoscale cavitation bubble nuclei. At the same time, the dissolved ozone and ozone microbubbles in the circulating liquid flow undergo efficient adsorption and recombination with these bubble nuclei, which significantly increases the number density of micro and nano bubbles in the liquid phase. Finally, nano-microbubble ozonated water loaded with high concentration of ozone is formed. This ozonated water is sent to the water distribution mechanism 10 through the first outlet pipe 95, and then uniformly sprayed back into the sewage zone 3. This process not only greatly improves the ozone dissolution efficiency and utilization rate, but also significantly enhances the effect of subsequent air flotation separation and oxidation reaction through secondary bubble enhancement.

[0034] like Figure 4 As shown, the gas-liquid circulation mechanism 9 also includes an air filter 97 and a one-way valve 98. The upper end of the air inlet pipe 96 is connected to the air filter 97, which is used to prevent impurities or particulate matter in the ozone-containing gas from being sucked in, so as to avoid impurities clogging the Venturi ejector 94 or polluting the water. The lower part of the air inlet pipe 96 is equipped with a one-way valve 98, which only allows gas to flow from the outside into the air inlet pipe 96 in one direction, and does not allow liquid to flow out of the air inlet pipe 96. Thus, when the circulating water pump 92 stops running, it can further prevent the liquid in the reaction zone 4 from flowing back into the air inlet pipe 96 through the ejector and overflowing outward, playing a double anti-backflow role and ensuring the safe and stable operation of the equipment.

[0035] like Figure 2 and Figure 4 As shown, the water distribution mechanism 10 includes a second pipe clamp 101, a connecting rod 102, a fixed water guide plate 103, a movable water guide plate 104, a water distribution pipe 105, and a drive assembly 106. Three second pipe clamps 101 are circumferentially and evenly spaced inside the housing 1. The second pipe clamps 101 are located in the lower part of the sewage zone 3. Each second pipe clamp 101 holds a connecting rod 102. The end of each connecting rod 102 away from the second pipe clamp 101 extends towards the center of the housing 1 and converges. The three connecting rods... The converging ends of 102 are connected to a fixed water guide plate 103. The fixed water guide plate 103 is connected to the first water outlet pipe 95. The lower part of the fixed water guide plate 103 is sealed and rotatably connected to a movable water guide plate 104. The lower part of the movable water guide plate 104 is connected to six water distribution pipes 105 at equal intervals in the circumference. The surface of the water distribution pipes 105 is provided with multiple water outlet holes at equal intervals along the axial direction. A drive assembly 106 is installed in the middle of the top of the partition plate 2. The drive assembly 106 is used to drive the movable water guide plate 104 to rotate.

[0036] like Figure 5 As shown, the drive assembly 106 includes a servo motor 1061, a large gear 1062 and a small gear 1063. The servo motor 1061 is installed in the middle of the top of the partition 2. The small gear 1063 is connected to the output shaft of the servo motor 1061. The large gear 1062 is connected to the outer side of the lower end of the movable water guide plate 104. The large gear 1062 meshes with the small gear 1063.

[0037] The high-concentration nano-microbubble ozonated water delivered by the circulating water pump 92 enters the fixed water guide plate 103 through the first outlet pipe 95, then flows into the movable water guide plate 104 which is sealed and rotatably connected to it, and finally sprays out through the water distribution pipe 105. The servo motor 1061 is started to drive the large gear 1062 to rotate through the small gear 1063, which in turn drives the movable water guide plate 104 and its six water distribution pipes 105 to rotate slowly. During the rotation, the ozonated water is evenly dispersed and sprayed to different positions in the sewage area 3, avoiding local uneven concentration and short-flow phenomenon caused by static water distribution, so that the microbubbles are fully mixed and contacted with the sewage, improving the efficiency of air flotation separation and oxidation.

[0038] like Figure 2 and Figure 6 As shown, the reflux mechanism 11 includes a reflux pump 111, a second inlet pipe 112, and a second outlet pipe 113. The reflux pump 111 is installed on the right side of the outer shell 1. The inlet end of the reflux pump 111 is connected to the second inlet pipe 112. The second inlet pipe 112 passes through the shell 1 and extends to the upper middle part of the sewage zone 3. The outlet end of the reflux pump 111 is connected to the second outlet pipe 113. The second outlet pipe 113 passes through the shell 1 and extends to the reaction zone 4. The reflux mechanism 11 is used to extract sewage from the upper middle layer of the sewage zone 3 and send it to the reaction zone 4 for treatment.

[0039] During the wastewater treatment process, the return pump 111 is activated. Since the electrically controlled guide pipe 8 is closed during the reaction, the wastewater zone 3 and the reaction zone 4 are isolated. After the return pump 111 starts, it draws substandard wastewater from the upper middle part of the wastewater zone 3 through the second inlet pipe 112 and then transports it back to the reaction zone 4 through the second outlet pipe 113. After being treated with ozone nano-microbubble oxidation in the reaction zone 4, the wastewater returns to the wastewater zone 3 through the gas-liquid circulation mechanism 9 and the water distribution mechanism 10. Subsequently, the substandard water in the upper middle layer of the wastewater zone 3 is again drawn back to the reaction zone 4 by the return mechanism 11 for secondary oxidation. The jet velocity of the circulating water pump 92 is kept consistent with the return velocity of the return pump 111, maintaining hydraulic balance within the system. This repeated cycle ensures that pollutants are repeatedly treated in the high-concentration ozone reaction zone, effectively extending the residence time and improving the removal rates of ammonia nitrogen, COD, and color.

[0040] Example 4: Based on Example 3, such as Figure 2 , Figure 6 and Figure 7As shown, the slag removal mechanism 12 includes a guide frame 121, a guide block 122, a float ring 123, a connecting frame 124, a slag suction pipe 125, a slag discharge hose 126, and a slag discharge rigid pipe 127. Four guide frames 121 are circumferentially and evenly spaced on the upper part of the housing 1. Each guide frame 121 has a sliding guide block 122. The upper and lower ends of the guide frame 121 are closed to limit the sliding stroke of the guide block 122 and prevent it from detaching from the guide frame 121. A float ring 123 is connected to all four guide blocks 122. The float ring 123 is a hollow, corrosion-resistant float. The pump body is made of polyethylene. A cross-shaped connecting frame 124 is provided inside the float ring 123. A sludge suction pipe 125 is connected to the bottom of the connecting frame 124. The sludge suction pipe 125 is cross-shaped, with its top at the intersection connected to the connecting frame 124. Multiple sludge suction ports are axially opened at the top of each branch of the sludge suction pipe 125. A sludge discharge hose 126 is connected to the bottom of the intersection of the sludge suction pipe 125. A sludge discharge rigid pipe 127 is connected to the end of the sludge discharge hose 126 away from the sludge suction pipe 125. The sludge discharge rigid pipe 127 extends out of the side wall of the housing 1, and its other end is connected to the pump body (not shown in the figure). During operation, the float ring 123 floats up and down with the rise and fall of the liquid level in the sewage zone 3. It slides smoothly along the guide frame 121 via the guide block 122, ensuring that the sludge suction ports of the sludge suction pipe 125 are always maintained at the optimal sludge removal position 1-3 cm below the liquid surface.

[0041] During the wastewater treatment process, a layer of scum gradually accumulates on the surface of wastewater zone 3, supported by microbubbles. Floating rings 123 float on the surface and slide up and down along guide frame 121 via guide block 122 as the liquid level rises and falls, causing suction pipe 125 to move synchronously. This ensures that the suction ports on each branch of suction pipe 125 are always maintained at the optimal scum removal position 1-3 cm below the liquid surface. The external pump connected to the scum discharge hard pipe 127 is started. Under negative pressure, the scum is sequentially drawn out of housing 1 through the suction port, suction pipe 125, discharge hose 126, and discharge hard pipe 127. The discharge hose 126 has a certain amount of flexibility to accommodate length changes caused by the raising and lowering of suction pipe 125. When the slag discharge carries away some liquid, causing the liquid level to drop, or when the sewage treatment meets the standards and the electrically controlled liquid outlet valve 13 is opened to discharge clean water, causing the liquid level to drop, the float ring 123 drives the slag suction pipe 125 to move down synchronously. The slag suction port can still be kept in the optimal slag removal position. Especially in the early stage of drainage, before the liquid level drops to a low level, the slag removal mechanism 12 can continue to work to remove the residual slag. When the device starts to inject water, when the liquid level reaches the position of the float ring 123, the float ring 123 is driven to move upward.

[0042] like Figure 6As shown, the system also includes a control system, an ozone concentration sensor 14, a high water level sensor 15, and a low water level sensor 16. The high water level sensor 15 and the low water level sensor 16 are respectively installed in the upper and lower parts of the housing 1. The ozone concentration sensor 14 is installed in the lower part of the housing 1, near the inlet of the first inlet pipe 93. The high water level sensor 15, the low water level sensor 16, the ozone concentration sensor 14, the electrically controlled guide pipe 8, the electrically controlled regulating valve 76, the electrically controlled inlet valve 5, and the electrically controlled outlet valve 13 are all electrically connected to the control system. The control system automatically controls the opening and closing of each electrically controlled valve and the opening degree according to the received liquid level signal and ozone concentration signal to realize the automated operation of the device. When the electrically controlled inlet valve 5 is opened, water is injected into the sewage zone 3. When the liquid level rises to the position of the high water level sensor 15, the guide block 122 is located at the top of the guide frame 121, and the control system immediately closes the electrically controlled inlet valve 5 to stop the liquid injection. After the wastewater treatment meets the standards, the electrically controlled outlet valve 13 opens, and clean water is discharged through it. When the liquid level drops to the position of the low water level sensor 16, it indicates that the clean liquid of the current batch has been basically discharged. The control system then closes the electrically controlled outlet valve 13 and simultaneously controls the electrically controlled guide pipe 8 to close and the electrically controlled inlet valve 5 to open, injecting the next batch of wastewater to be treated. The ozone concentration sensor 14 is used to monitor the dissolved ozone concentration in the reaction zone 4 in real time. The control system automatically adjusts the opening of the electrically controlled regulating valve 76 according to the preset concentration threshold. When the dissolved ozone concentration is higher than the set threshold, the control system automatically reduces the opening of the electrically controlled regulating valve 76 to reduce the ozone dosage; when the dissolved ozone concentration is lower than the set threshold, the opening is increased to increase the ozone dosage. Through this closed-loop regulation, sufficient oxidation capacity is ensured in the reaction zone 4.

[0043] In this embodiment, the sewage treatment standard is determined by a timed control method, that is, a single treatment cycle is preset (e.g., 30-60 minutes). When the treatment time reaches the set value, the control system determines that the sewage treatment standard is met and controls the electrically controlled liquid outlet valve 13 to open and discharge clean water.

[0044] Example 5: Based on Example 4, but differing from Example 4, this example uses sensor detection to determine whether wastewater treatment meets standards. Water quality sensors (not shown in the figure) are installed in the reaction zone 4 and wastewater zone 3 respectively. These sensors include a COD sensor, an ammonia nitrogen sensor, and a color sensor. Each sensor is electrically connected to the control system. When both sensors detect that the water quality meets the preset discharge standard, the control system determines that the wastewater treatment meets the standard and controls the electrically controlled discharge valve 13 to open, allowing clean water to be discharged.

[0045] Example 6: Based on Example 4, such as Figures 1-7 The wastewater decolorization and ammonia nitrogen and COD reduction purification device shown includes the following steps: S1: Control the opening of the electrically controlled inlet valve 5, so that the sewage to be treated enters the sewage zone 3, and the sewage flows into the reaction zone 4 through the electrically controlled guide pipe 8. Then close the electrically controlled guide pipe 8. S2: Start the ozone module 6, and cut the ozone gas into micro-nano-scale bubbles through the aeration and release mechanism 7 and dissolve them into the wastewater in the reaction zone 4 to form an ozone micro-bubble mixture. S3: The ozone concentration sensor 14 detects the ozone concentration in the reaction zone 4 in real time and feeds it back to the control system. The control system controls the opening of the electronic control regulating valve 76 according to the set threshold, and adjusts the amount of air supplied from the ozone module 6 to the aeration release mechanism 7 so that the ozone concentration in the reaction zone 4 is maintained within the preset range. S4: Start the circulating water pump 92 to draw and pressurize the ozone microbubble mixture in the reaction zone 4 and send it into the Venturi jet 94. Air is drawn in through the air inlet pipe 96. In the Venturi jet 94, the gas and liquid phases are broken and mixed by the cavitation effect and shear force of the high-speed liquid flow to form high-density nano-microbubble ozonated water, which is then injected back into the sewage zone 3 through the water distribution mechanism 10. S5: Start the return pump 111 to draw the upper layer of sewage in sewage zone 3 through the second inlet pipe 112 and then send it into the reaction zone 4 through the second outlet pipe 113. S6: Start the slag removal mechanism 12 to suck the slag that has accumulated on the liquid surface into the slag suction pipe 125 and discharge it through the slag discharge hose 126 and the slag discharge hard pipe 127. S7: After the treatment meets the standards, control the electronically controlled liquid outlet valve 13 to open.

Claims

1. A wastewater decolorization and ammonia nitrogen and COD reduction purification device, comprising a shell (1) and a partition (2), wherein a horizontal partition (2) is connected to the lower part of the shell (1), and the partition (2) divides the inner cavity of the shell (1) into upper and lower cavities, the upper cavity being a wastewater zone (3) and the lower cavity being a reaction zone (4), characterized in that: It also includes an electrically controlled water inlet valve (5), an ozone module (6), an aeration release mechanism (7), an electrically controlled guide pipe (8), a gas-liquid circulation mechanism (9), a water distribution mechanism (10), a return flow mechanism (11), a slag removal mechanism (12), and an electrically controlled liquid outlet valve (13). The top of the housing (1) is connected to the electrically controlled water inlet valve (5). The aeration release mechanism (7) is installed in the lower part of the reaction zone (4) and is connected to the ozone module (6) through a pipeline. An electrically controlled guide pipe (8) is installed through the partition plate (2). The lower end of the electrically controlled guide pipe (8) extends into the reaction zone (4). A gas-liquid circulation mechanism (9) is installed on one side of the shell (1). A water distribution mechanism (10) is provided in the lower part of the sewage zone (3). The water distribution mechanism (10) is connected to the gas-liquid circulation mechanism (9). A return mechanism (11) is installed on the other side of the shell (1). The return mechanism (11) connects the sewage zone (3) and the reaction zone (4). A slag removal mechanism (12) is provided at the top of the shell (1). An electrically controlled liquid outlet valve (13) is connected to the bottom of the shell (1).

2. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 1, characterized in that: The aeration release mechanism (7) includes a connecting pipe (72), an air distribution ring pipe (73), an aeration disc (74), an air distribution main pipe (75), and an electronically controlled regulating valve (76). At least two connecting pipes (72) are provided at the bottom of the housing (1). Multiple air distribution ring pipes (73) are connected between the tops of the connecting pipes (72). Multiple aeration discs (74) are provided on each air distribution ring pipe (73). One of the air distribution ring pipes (73) is connected to the electronically controlled regulating valve (76) through the air distribution main pipe (75). The air distribution main pipe (75) is connected to the ozone module (6) through the pipeline via the electronically controlled regulating valve (76).

3. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 2, characterized in that: The gas-liquid circulation mechanism (9) includes a circulating water pump (92), a first inlet pipe (93), a Venturi jet (94), a first outlet pipe (95), and an air inlet pipe (96). The circulating water pump (92) is installed on the outer wall of the housing (1). The liquid inlet end of the circulating water pump (92) is connected to the first inlet pipe (93). The first inlet pipe (93) penetrates into the reaction zone (4) inside the housing (1). The liquid outlet end of the circulating water pump (92) is connected to the inlet of the Venturi jet (94). The liquid outlet end of the Venturi jet (94) is connected to the first outlet pipe (95). The first outlet pipe (95) penetrates into the sewage zone (3) inside the housing (1) and is connected to the water distribution mechanism (10). The air inlet end of the Venturi jet (94) is connected to the air inlet pipe (96).

4. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 3, characterized in that: The gas-liquid circulation mechanism (9) also includes an air filter (97) and a one-way valve (98). The air inlet end of the air inlet pipe (96) is connected to the air filter (97), and a one-way valve (98) is installed at the lower part of the air inlet pipe (96). The one-way valve (98) only allows gas to flow unidirectionally from the outside to the air inlet pipe (96).

5. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 4, characterized in that: The water distribution mechanism (10) includes a connecting rod (102), a fixed water guide plate (103), a movable water guide plate (104), a water distribution pipe (105), and a drive assembly (106). The inner wall of the housing (1) is connected to the connecting rod (102) located in the sewage zone (3). The other end of the connecting rod (102) is connected to a fixed water guide plate (103). The fixed water guide plate (103) is connected to the first water outlet pipe (95). The movable water guide plate (104) is sealed and rotated inside the fixed water guide plate (103). At least two water distribution pipes (105) are connected to the movable water guide plate (104) at equal intervals around the periphery. The drive assembly (106) is installed on the top of the partition (2). The drive assembly (106) is used to drive the movable water guide plate (104) to rotate.

6. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 5, characterized in that: The reflux mechanism (11) includes a reflux pump (111), a second inlet pipe (112), and a second outlet pipe (113). The reflux pump (111) is installed on the outer wall of the housing (1). The inlet end of the reflux pump (111) is connected to the second inlet pipe (112). The second inlet pipe (112) penetrates into the housing (1) and extends to the upper middle part of the sewage zone (3). The outlet end of the reflux pump (111) is connected to the second outlet pipe (113). The second outlet pipe (113) penetrates into the housing (1) and extends to the reaction zone (4).

7. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 6, characterized in that: The slag removal mechanism (12) includes a guide frame (121), a guide block (122), a float ring (123), a connecting frame (124), a slag suction pipe (125), a slag discharge hose (126), and a slag discharge hard pipe (127). At least two guide frames (121) are connected to the upper part of the shell (1). Each guide frame (121) is provided with a sliding guide block (122). A float ring (123) is connected between the guide blocks (122). A connecting frame (124) is provided inside the float ring (123). A slag suction pipe (125) is connected to the bottom of the connecting frame (124). A slag discharge hose (126) is connected to the bottom of the slag suction pipe (125). A slag discharge hard pipe (127) is connected to the end of the slag discharge hose (126) away from the slag suction pipe (125). The slag discharge hard pipe (127) extends out of the side wall of the shell (1).

8. The wastewater decolorization and ammonia nitrogen and COD reduction purification device according to claim 7, characterized in that: It also includes a control system, an ozone concentration sensor (14), a high water level sensor (15), and a low water level sensor (16). The high water level sensor (15) and the low water level sensor (16) are installed in the upper and lower parts of the housing (1), respectively. The ozone concentration sensor (14) is installed in the lower part of the housing (1), and its position is close to the inlet of the first water inlet pipe (93). The high water level sensor (15), the low water level sensor (16), the ozone concentration sensor (14), the electrically controlled guide pipe (8), the electrically controlled regulating valve (76), the electrically controlled inlet valve (5), and the electrically controlled outlet valve (13) are all electrically connected to the control system.

9. A method for purifying wastewater by decolorizing and reducing ammonia nitrogen and COD using the apparatus described in any one of claims 1 to 8, characterized in that: Includes the following steps: S1: Control the opening of the electric inlet valve (5), the sewage to be treated enters the sewage zone (3), the sewage flows into the reaction zone (4) through the electric guide pipe (8), and the electric guide pipe (8) is closed. S2: Start the ozone module (6), and cut the ozone gas into micro-nano-scale bubbles through the aeration release mechanism (7) and dissolve them into the wastewater in the reaction zone (4) to form an ozone micro-bubble mixture; S3: The ozone concentration sensor (14) detects the ozone concentration in the reaction zone (4) in real time and feeds it back to the control system. The control system controls the opening of the electronic control regulating valve (76) according to the set threshold, and adjusts the amount of gas supplied by the ozone module (6) to the aeration release mechanism (7) so that the ozone concentration in the reaction zone (4) is maintained within the preset range. S4: Start the circulating water pump (92) to draw and pressurize the ozone microbubble mixture in the reaction zone (4) and send it into the Venturi jet (94). Air is drawn in through the air inlet pipe (96). In the Venturi jet (94), the gas and liquid phases are broken and mixed by the cavitation effect and shear force of the high-speed liquid flow to form high-density nano-microbubble ozonated water, which is then injected back into the sewage zone (3) through the water distribution mechanism (10). S5: Start the reflux pump (111) to draw the upper layer of sewage in the sewage zone (3) through the second inlet pipe (112) and then send it into the reaction zone (4) through the second outlet pipe (113). S6: Start the slag removal mechanism (12) to suck the slag that has accumulated on the liquid surface into the slag suction pipe (125) and discharge it through the slag discharge hose (126) and the slag discharge hard pipe (127); S7: After the treatment meets the standard, control the opening of the electronically controlled liquid outlet valve (13).

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