Self-circulation gas stripping type co2 carbon sequestration wastewater treatment device and method thereof

Abstract

This invention relates to the field of water treatment equipment technology, specifically to a self-circulating airlift CO2 carbon fixation wastewater treatment device and method. The device includes a treatment tank with an airlift pipe inside. A circulation assembly is located at the bottom of the airlift pipe, comprising several collection hoppers and circulation pipes. An airlift mechanism is installed inside the treatment tank, including a main air supply pipe and several aeration components. Each aeration component includes a riser, a ring pipe, and an impeller. A sedimentation collection mechanism is also installed on the treatment tank, comprising several baffles and several collection pipes. This invention, through the airlift pipe, circulation assembly, and airlift mechanism, increases the contact area between CO2 and wastewater, improving the aeration effect and thus enhancing the sufficiency of the carbon fixation reaction. The sedimentation collection mechanism allows large carbon-fixing particles in the wastewater to be intercepted by the filter plates during the self-circulation process, preventing sediment accumulation from affecting wastewater flow and clogging the discharge structure.

Description

Technical Field

[0001] This invention relates to the field of water treatment equipment technology, specifically to a self-circulating air-lift CO2 carbon fixation wastewater treatment device and method. Background Technology

[0002] CO2 sequestration is a crucial pathway to carbon reduction, its core being the conversion of gaseous CO2 into a stable solid form for long-term carbon sequestration. Wastewater treatment often contains various ions that can react with CO2, providing an excellent reaction carrier for CO2 sequestration. Achieving synergistic progress in wastewater purification and carbon sequestration has become an important research direction in environmental protection. Air stripping technology, as a highly efficient gas-liquid contact method, promotes thorough mixing of CO2 and wastewater, facilitating rapid CO2 dissolution and reaction, thereby achieving carbon sequestration. The self-circulating air stripping treatment mode relies on its own structure to generate circulation power, requiring no additional power input, aligning with the environmental protection concept of energy conservation and emission reduction. It can both purify wastewater and convert CO2 into solid precipitates, achieving rational resource utilization and providing a feasible path for the synergistic development of carbon reduction and wastewater treatment.

[0003] Patent CN217025514U discloses a device for carbon fixation and hardness removal. This device includes a water tank and a carbon dioxide chamber. The carbon dioxide chamber is located above and connected to the water tank. A Venturi jet injector is installed inside the carbon dioxide chamber, which is connected to a carbon dioxide inlet channel. This device dissolves gaseous CO2 in water under pressure to form carbonate or bicarbonate ions. These ions react with calcium and magnesium ions in the water to form precipitates that can be recovered. This achieves both wastewater recycling and resource conservation, and reduces atmospheric carbon dioxide concentration, thus simultaneously performing the dual functions of carbon fixation and hardness removal. It eliminates the need for hardness-removing agents, resulting in lower costs, no byproducts, a simple structure, convenient operation, and environmental safety.

[0004] The current carbon fixation and hardness removal device relies on an external centrifugal pump for power to achieve the mixing and circulation of water and CO2. It lacks an independent circulation structure, resulting in significant power consumption. Furthermore, the gas-liquid mixing is achieved solely through a Venturi jet injector, leading to large CO2 bubble sizes that cannot be fully dispersed. This results in a limited contact area between CO2 and wastewater, resulting in mediocre aeration and consequently affecting the sufficiency of the carbon fixation reaction. In addition, the large particulate precipitates generated by the reaction accumulate directly at the bottom of the pool, which not only affects the flow of wastewater within the pool but may also block the bottom discharge channel. Therefore, we propose a self-circulating airlift CO2 carbon fixation wastewater treatment device and method. Summary of the Invention

[0005] The purpose of this invention is to provide a self-circulating air-lift CO2 carbon fixation wastewater treatment device and method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A self-circulating airlift CO2 carbon fixation wastewater treatment device includes a treatment tank with a tank cover installed at the top. An airlift pipe is fixed inside the treatment tank, and a circulation component is provided at the bottom of the airlift pipe. The circulation component includes several receiving hoppers surrounding the bottom of the airlift pipe and the inner wall of the treatment tank, and an annular circulation pipe located at the bottom of the inner side of the airlift pipe and connected to the receiving hoppers. Several effluent protrusions are connected to the outside of the circulation pipe. The treatment tank is equipped with an air lifting mechanism, which includes an air supply main pipe and several aeration components installed in the air lifting pipe. The aeration components include a riser, a ring pipe connected to the top of the riser, and an impeller rotatably connected to the top of the ring pipe. Several jet nozzles are installed on the top of the ring pipe. The processing tank is also equipped with a sedimentation collection mechanism, which includes several partitions fixed between the outer wall of the top of the gas stripping pipe and the inner wall of the processing tank, and several collection pipes installed outside the processing tank. A filter plate is fixed between two adjacent partitions, and the collection pipes are connected to the space between two adjacent partitions. The bottom ends of several collection pipes are connected to the same collecting pipe.

[0007] Preferably, the top of the tank cover is connected to a wastewater injection pipe and an exhaust pipe, the end of the exhaust pipe extends into the top of the air-lift pipe, the bottom of the treatment tank is connected to a discharge pipe, the beginning of the discharge pipe extends into the bottom of the air-lift pipe, the liquid level in the treatment tank submerges the top of the air-lift pipe, and a liquid level observation window is provided at the top position of the outer surface of the treatment tank. In this setup, the wastewater injection pipe can inject wastewater to be treated into the treatment tank, the exhaust pipe can discharge unreacted exhaust gas, the discharge pipe can discharge treated wastewater, and the liquid level observation window can observe the liquid level in the tank to ensure that the liquid level meets the requirements of gas stripping circulation.

[0008] Preferably, the air-lift pipe is open at the top and bottom and is located in the middle of the processing tank. The bottom end of the air-lift pipe is fixedly connected to the bottom of the processing tank. Several collection hoppers are distributed in a ring at equal intervals outside the air-lift pipe. Adjacent collection hoppers are fixedly connected to each other. The bottom end of the collection hopper is connected to the circulation pipe by a connecting pipe. The connecting pipe passes through the bottom of the air-lift pipe and is fixedly connected to the air-lift pipe. In this setup, the open top and bottom airlift pipes facilitate the flow of gas-liquid mixtures and wastewater circulation, while the annularly spaced collection hoppers uniformly collect wastewater. Connecting pipes enable communication between the collection hoppers and the circulation pipes, ensuring smooth circulation.

[0009] Preferably, the main gas supply pipe has a bent pipe structure, and at least one of the bends in the main gas supply pipe is higher than the top of the tank cover. The end of the main gas supply pipe is connected to several gas supply branch pipes, and the end of the gas supply branch pipes extends into the lower part of the treatment tank. The bottom end of the riser penetrates the bottom of the treatment tank and is connected to the corresponding gas supply branch pipe. In this setup, the main air supply pipe with a bent structure and the bend higher than the tank cover can prevent wastewater from flowing back into the tank, while the branch air supply pipes can distribute CO2 to each aeration component, ensuring that each aeration component is supplied with air evenly.

[0010] Preferably, the annular pipe is coaxially sleeved on the top outer side of the riser, and several connecting pipes are connected between the top of the riser and the annular pipe. The main gas supply pipe, the branch gas supply pipe, the riser, the connecting pipes and the annular pipe are in a connected state, and the height of the water outlet end of the water outlet protrusion is lower than the height of the annular pipe. In this setup, the connected air supply pipeline ensures that CO2 is smoothly delivered to the loop pipe, and the outlet end of the outlet convex pipe is lower than the loop pipe to avoid the circulating liquid impacting the aeration components, while also preventing gas backflow and ensuring the aeration effect.

[0011] Preferably, the impeller is composed of several inclined blades arranged in a ring array around the axis of the riser. Several blades are fixedly connected by a ring rod. A rotating seat is connected to the center of the impeller by a connecting rod. A T-shaped stop bar is fixed to the top of the riser. The bottom end of the stop bar passes through the rotating seat and is rotatably connected to the rotating seat. In this configuration, the inclined blades of the annular array are easily driven to rotate by CO2 gas, and the rotating seat and the baffle work together to achieve the rotation of the impeller.

[0012] Preferably, several of the jet heads are arranged in a ring with equal spacing around the axis of the annular pipe, with the head of the jet head facing below the blades of the impeller, and a float is fixed to the top of the rotating seat with a vertical rod; In this setup, the equally spaced, annular jet nozzles can uniformly spray CO2, while the jet nozzles facing downwards from the blades can effectively drive the impeller to rotate. The float ball can counteract the weight of the impeller, ensuring smooth impeller rotation.

[0013] Preferably, several baffles are vertically fixed between the top outer wall of the air-lift pipe and the inner wall of the treatment tank, and are evenly arranged in a ring with equal spacing around the axis of the air-lift pipe. The baffles divide the annular area between the top of the air-lift pipe and the inner wall of the treatment tank into multiple vertically permeable cavities with the same structure. The filter plate is fixed in an inclined state in each vertically permeable cavity. The two sides of the filter plate are fixedly connected to the inner walls of two adjacent baffles respectively. The filter plate is inclined at 30°-45° between two baffles. The number of collection pipes corresponds one-to-one with the number of vertically permeable cavities. The top of the collection pipe is integrally formed with a connecting seat. The connecting seat penetrates the side wall of the treatment tank and is fixedly connected to the tank wall. The inner end of the connecting seat is connected to the bottom edge of the top surface of the filter plate to receive the precipitate trapped on the filter plate. A precipitate observation window is embedded on the outer wall of the collection pipe. The precipitate observation window is set along the length of the collection pipe to facilitate observation of the amount of precipitate accumulation in the pipe. In this setup, the partition can divide the space into independent filter chambers, the inclined filter plate can intercept large particles of sediment and guide them to slide down, the connecting seat can guide the sediment into the collection tube, and the sediment observation window can facilitate observation of sediment accumulation and timely cleaning.

[0014] Preferably, the collecting pipe has an annular pipe structure and is fixed to the outside of the treatment tank. A sediment discharge pipe is connected to the outside of the collecting pipe, and a valve is provided at the end of the sediment discharge pipe. In this setup, the annular collection pipe collects the sediment from each collection pipe, the sediment discharge pipe discharges the sediment, and the valve controls the timing of sediment discharge to prevent indiscriminate discharge.

[0015] On the other hand, the present invention also provides a self-circulating air-lift CO2 carbon fixation wastewater treatment method, which uses the above-mentioned self-circulating air-lift CO2 carbon fixation wastewater treatment device and includes the following steps: S1. Wastewater Injection: Inject the wastewater to be treated into the treatment tank through the wastewater injection pipe on the tank cover. Observe the liquid level through the liquid level observation window until the wastewater level submerges the top of the gas lift pipe, and then close the wastewater injection pipe. S2, CO2 gas supply: CO2 gas is continuously introduced from the main gas supply pipe. The CO2 flows into the ring pipe in sequence along the main gas supply pipe, the branch gas supply pipe, the riser, and the connecting pipe, and finally is ejected upward from several nozzles at the top of the ring pipe. S3. Aeration and Impeller Rotation: The CO2 gas ejected from the jet nozzle is sprayed towards the underside of the impeller blades, driving the impeller to rotate around the baffle and rotating seat. The rotating impeller breaks the CO2 gas into fine bubbles, increasing the contact area between CO2 and wastewater and improving the aeration effect. The float rotates synchronously with the impeller, helping to stabilize the rotation posture of the impeller. S4. Self-circulation formation: After the wastewater in the air-lift pipeline is aerated, the density of the gas-liquid mixture decreases and it surges upward. The unaerated wastewater between the treatment tank and the air-lift pipeline flows into the receiving hopper surrounding the bottom of the air-lift pipeline under the action of the liquid level difference and the air-lift force. It then flows into the annular circulation pipe at the bottom of the inner side of the air-lift pipeline through the connecting pipe, and then is discharged into the bottom of the air-lift pipeline through several outlet protrusions outside the circulation pipe, forming a stable self-circulation. S5. Sedimentation and Collection: During the self-circulation process, the wastewater surging at the top of the air-lift pipe flows to the annular area between the air-lift pipe and the inner wall of the treatment tank. The vertically permeable cavity formed by several partitions intercepts the larger carbon precipitates in the wastewater by the filter plates in the cavity. The precipitates slide down the 30°-45° inclined surface of the filter plates and enter the corresponding collection pipe through the connecting seat for accumulation. The amount of precipitate accumulation can be observed through the precipitate observation window on the collection pipe. S6. Sediment discharge: When the sediment in the collection pipe accumulates to the preset amount, open the valve at the end of the sediment discharge pipe. The sediment in each collection pipe is collected through the collection pipe and discharged from the sediment discharge pipe. S7. Wastewater discharge after treatment: After the carbon fixation reaction is completed and the precipitate is collected and discharged, open the discharge pipe at the bottom of the treatment tank and discharge the qualified wastewater from the bottom of the air stripping pipe. After the discharge is completed, close the discharge pipe to complete a single wastewater treatment. Repeat the above steps to treat the next batch of wastewater. S8. Exhaust Gas Discharge: CO2 gas that did not participate in the carbon fixation reaction during the reaction is discharged through the exhaust pipe on the tank cover to avoid excessive gas pressure inside the treatment tank affecting the self-circulation.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the design of an air-lift pipe, circulation components, and an air-lift mechanism, enables the CO2 ejected from the jet nozzle in the air-lift mechanism to drive the impeller above to rotate, breaking the CO2 gas into fine bubbles. At the same time, after aeration, the wastewater in the air-lift pipe experiences a decrease in density of the gas-liquid mixture and surges upward, causing the wastewater between the treatment tank and the air-lift pipe to flow back to the bottom of the air-lift pipe through the receiving hopper, connecting pipe, annular circulation pipe, and effluent convex pipe, forming a stable self-circulation. This increases the contact area between CO2 and wastewater, improves the aeration effect, and thus enhances the sufficiency of the carbon fixation reaction. 2. The present invention, through the set sedimentation and collection mechanism, enables large particles of solid carbon precipitates in the wastewater during the self-circulation process to be intercepted in advance by the filter plate. The precipitates slide down the inclined filter plate into the collection pipe for accumulation. The accumulation amount can be observed through the sediment observation window on the collection pipe and discharged in a timely manner, avoiding the accumulation of precipitates from affecting the wastewater flow and clogging the discharge structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the processing tank in this invention; Figure 3 This is a schematic diagram of the installation of the circulation component in this invention; Figure 4 This is a schematic diagram of the structure of the circulation component in this invention; Figure 5 This is a schematic diagram of the air-lift mechanism in this invention; Figure 6 This is a schematic diagram of the aeration component in this invention; Figure 7 This is a schematic diagram of the sedimentation collection mechanism in this invention; Figure 8 This is a schematic diagram of the structure of the collection tube in this invention; The meanings of the labels in the diagram are as follows: 100. Treatment tank; 110. Tank cover; 111. Wastewater inlet pipe; 112. Exhaust pipe; 120. Air lift pipe; 130. Circulation assembly; 131. Container hopper; 132. Circulation pipe; 1321. Outlet convex pipe; 133. Connecting pipe; 140. Discharge pipe; 150. Liquid level observation window; 200. Air lifting mechanism; 210. Main air supply pipe; 211. Branch air supply pipe; 220. Aeration assembly; 221. Riser; 222. Ring pipe; 2221. Connecting pipe; 2222. Jet nozzle; 2223. Baffle; 223. Impeller; 2231. Rotating seat; 2232. Float; 300. Sedimentation collection mechanism; 310. Partition plate; 311. Filter plate; 320. Collection pipe; 321. Connecting seat; 322. Sediment observation window; 330. Collection pipe; 331. Sediment discharge pipe; 332. Valve. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-8A self-circulating airlift CO2 carbon fixation wastewater treatment device includes a treatment tank 100. A tank cover 110 is installed on the top of the treatment tank 100 to seal the top of the treatment tank 100 and prevent wastewater from splashing out and gas from leaking out. A wastewater inlet pipe 111 and an exhaust pipe 112 are connected to the top of the tank cover 110. The wastewater inlet pipe 111 is used to introduce wastewater to be treated into the treatment tank 100, and the exhaust pipe 112 is used to discharge the tail gas in the tank that has not participated in the carbon fixation reaction, so as to avoid the excessive gas pressure in the tank from affecting the normal operation of the device. The end of the exhaust pipe 112 extends into the top of the airlift pipe 120. The bottom of the treatment tank 100 is connected to a discharge pipe 140, which is used to discharge the treated wastewater to achieve the standard discharge of wastewater. The first end of the discharge pipe 140 extends into the bottom of the air-lift pipe 120. A liquid level observation window 150 is set at the top of the outer surface of the treatment tank 100. The liquid level observation window 150 allows the staff to directly observe the liquid level of the wastewater in the tank, ensuring that the liquid level can submerge the top of the air-lift pipe 120, meeting the basic requirements of self-circulation and air-lift reaction. The liquid level in the treatment tank 100 submerges the top of the air-lift pipe 120.

[0020] like Figures 2-4As shown, in this invention, a gas lift pipe 120 is fixed inside the treatment tank 100. The gas lift pipe 120 is open at the top and bottom and is located in the middle of the treatment tank 100. The open structure facilitates the up-and-down movement of wastewater and gas-liquid mixture inside the tank. The location in the middle allows for more uniform wastewater circulation. The bottom end of the gas lift pipe 120 is fixedly connected to the bottom of the treatment tank 100 to seal the bottom end of the gas lift pipe 120, preventing the gas-liquid mixture inside the gas lift pipe 120 from leaking from the bottom end and ensuring the gas lift and self-circulation effects. A circulation component 130 is installed at the bottom of the air-lift pipe 120. The circulation component 130 is used to realize the self-circulation of wastewater in the tank without the need for external power drive, thus reducing energy consumption. The circulation component 130 includes several collection hoppers 131 and annular circulation pipe 132. The collection hoppers 131 are arranged in a ring at equal intervals between the bottom of the air-lift pipe 120 and the inner wall of the treatment tank 100. The ring at equal intervals can evenly receive the unaerated wastewater between the treatment tank 100 and the air-lift pipe 120, ensuring uniform circulation flow. Adjacent collection hoppers 131 are fixedly connected. The annular circulation pipe 132 is located at the bottom of the inner side of the air lift pipe 120. The annular structure allows the circulating wastewater to be evenly discharged into the bottom of the air lift pipe 120. The bottom end of the receiving hopper 131 is connected to the circulation pipe 132 by a connecting pipe 133. The connecting pipe 133 is used to realize the flow of wastewater between the receiving hopper 131 and the circulation pipe 132, providing a channel for wastewater circulation. The connecting pipe 133 passes through the bottom of the air lift pipe 120 and is fixedly connected to the air lift pipe 120, which can fix the position of the connecting pipe 133 and prevent it from shifting when the wastewater flows. Several outlet protrusions 1321 are connected to the outside of the circulation pipe 132. The outlet protrusions 1321 can evenly discharge the wastewater in the circulation pipe 132 into the bottom of the air lift pipe 120, so that it can fully contact the gas sprayed by the aeration component 220.

[0021] like Figure 2 , Figure 5 and Figure 6As shown, specifically, the treatment tank 100 is equipped with an air-lift mechanism 200. The air-lift mechanism 200 is used to introduce CO2 gas into the tank and achieve aeration, providing conditions for carbon fixation reaction. The air-lift mechanism 200 includes a gas supply main pipe 210 and several aeration components 220. Several aeration components 220 are arranged in the air-lift pipe 120. Multiple aeration components 220 can increase the contact range between CO2 and wastewater and improve the uniformity of aeration. The main gas supply pipe 210 has a bent pipe structure, and at least one bend in the main gas supply pipe 210 is higher than the top of the tank cover 110. This structure can prevent wastewater in the treatment tank 100 from flowing back into the main gas supply pipe 210 and avoid blocking the gas supply channel. Several gas supply branch pipes 211 are connected to the end of the main gas supply pipe 210. The gas supply branch pipes 211 are used to divert CO2 gas in the main gas supply pipe 210 to each aeration component 220 to ensure uniform gas supply to each aeration component 220. The end of the gas supply branch pipe 211 extends into the lower part of the treatment tank 100. The bottom end of the riser pipe 221 in the aeration component 220 passes through the bottom of the treatment tank 100 and is connected to the corresponding gas supply branch pipe 211, which can realize the stable delivery of CO2 gas from the gas supply branch pipe 211 to the riser pipe 221 and ensure smooth gas supply.

[0022] like Figure 5 and Figure 6 As shown, the aeration assembly 220 further includes a riser 221, a ring pipe 222, and an impeller 223. The ring pipe 222 is coaxially sleeved on the top outer side of the riser 221. The coaxial sleeve structure allows the ring pipe 222 to be evenly stressed and facilitates the uniform distribution of CO2 gas from the riser 221 to the ring pipe 222. Several connecting pipes 2221 are connected between the top of the riser 221 and the ring pipe 222. The connecting pipes 2221 are used to connect the riser 221 and the ring pipe 222, providing a flow channel for CO2 gas. The main gas supply pipe 210, the branch gas supply pipe 211, the riser 221, the connecting pipes 2221, and the ring pipe 222 are interconnected, which can ensure that CO2 gas is smoothly delivered from the main gas supply pipe 210 to the ring pipe 222, ensuring the continuous operation of the aeration process. Several jet nozzles 2222 are installed at the top of the ring pipe 222. The jet nozzles 2222 are used to spray CO2 gas in the ring pipe 222 in the form of bubbles to achieve contact with wastewater. The jet nozzles 2222 are arranged in a ring with equal spacing around the axis of the ring pipe 222, which can make CO2 bubbles evenly distributed in the air lift pipe 120, improving the uniformity of aeration. The outlet end of the outlet convex pipe 1321 is lower than the position of the ring pipe 222, which can prevent the circulating wastewater from impacting the jet nozzles 2222 and impeller 223, and at the same time prevent gas from flowing back into the circulation pipe 132, ensuring the aeration effect and smooth circulation.

[0023] like Figure 6As shown, impeller 223 is rotatably connected above ring pipe 222. Impeller 223 consists of several inclined blades arranged in a ring array around the axis of riser 221. The inclined blades in the ring array are easily driven to rotate by CO2 gas ejected from jet head 2222, and can break CO2 bubbles into smaller particles. Several blades are fixedly connected by ring rods, which can fix the relative position of the blades, enhance the structural stability of impeller 223, and prevent the blades from deforming during rotation. A rotating seat 2231 is connected to the center of impeller 223 by a connecting rod. The rotating seat 2231 provides a support point for the rotation of impeller 223. A T-shaped baffle 2223 is fixed to the top of riser 221. The bottom end of baffle 2223 passes through rotating seat 2231 and is rotatably connected to rotating seat 2231. The T-shaped baffle 2223 can limit the axial displacement of rotating seat 2231, ensuring that impeller 223 rotates only around baffle 2223. The head of the jet nozzle 2222 faces the underside of the blades of the impeller 223, which allows the CO2 gas ejected by the jet nozzle 2222 to act precisely on the blades and effectively drive the impeller 223 to rotate. A float 2232 is fixed to the top of the rotating seat 2231 with a vertical rod. The float 2232 can counteract the weight of the impeller 223, reduce the frictional resistance when the impeller 223 rotates, and make the impeller 223 rotate more smoothly.

[0024] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, it is worth noting that the treatment tank 100 is equipped with a sedimentation collection mechanism 300. The sedimentation collection mechanism 300 is used to intercept and collect large particulate precipitates generated by the carbon fixation reaction, so as to avoid the accumulation of precipitates affecting the operation of the device. The sedimentation collection mechanism 300 includes several baffles 310 and several collection pipes 320. The baffles 310 are all vertically fixed between the top outer wall of the air lift pipe 120 and the inner wall of the treatment tank 100, and are evenly arranged in a ring with equal spacing around the axis of the air lift pipe 120. The vertically fixed baffles 310 can enhance the structural stability, and the ring-shaped arrangement can evenly divide the ring area to ensure that the filtration effect of each area is consistent. The baffles 310 divide the ring area between the top of the air lift pipe 120 and the inner wall of the treatment tank 100 into multiple vertically permeable cavities with the same structure. The vertically permeable cavities can allow wastewater to pass through in an orderly manner, while providing installation space for the filter plates 311.

[0025] like Figure 2 and Figure 7As shown, it is worth noting that a filter plate 311 is fixed between two adjacent partitions 310. The filter plate 311 is used to intercept large particles of carbon precipitates in the wastewater, preventing the precipitates from entering the circulation system and affecting the operation of the equipment. The filter plate 311 is fixed in an inclined state in each vertically permeable cavity. The two sides of the filter plate 311 are fixedly connected to the inner walls of the two adjacent partitions 310, which can fix the position of the filter plate 311 and prevent it from shifting under the impact of wastewater. The filter plate 311 is inclined at 30°-45° between the two partitions 310. This inclination angle allows the intercepted precipitates to slide down along the filter plate 311, preventing the precipitates from accumulating and clogging the surface of the filter plate 311. The collection pipe 320 is installed outside the treatment tank 100. The collection pipe 320 stores the sediment intercepted by the filter plate 311 for easy subsequent centralized cleaning. The number of collection pipes 320 corresponds one-to-one with the number of vertical permeable cavities, enabling zoned collection of sediment and preventing mixing and blockage of pipes by sediment from different areas. A connecting seat 321 is integrally formed at the top of each collection pipe 320. The connecting seat 321 connects the collection pipe 320 to the vertical permeable cavity, providing a channel for sediment to slide down. The connecting seat 321 penetrates the side wall of the treatment tank 100. It is fixedly connected to the tank wall, and the inner end of the connecting seat 321 is connected to the bottom edge of the top surface of the filter plate 311, so that the sediment on the filter plate 311 can slide smoothly into the collection pipe 320 to avoid residue. The outer wall of the collection pipe 320 is provided with a sediment observation window 322. The sediment observation window 322 makes it easy for the staff to observe the amount of sediment accumulation in the collection pipe 320 and clean it in time. The sediment observation window 322 is set along the length of the collection pipe 320, which can expand the observation range and more clearly grasp the sediment accumulation.

[0026] In addition, several collection pipes 320 are connected at their bottom ends to the same collection pipe 330. The collection pipe 330 is used to collect the sediment in each collection pipe 320 and realize the centralized discharge of the sediment. The collection pipe 330 has a ring pipe structure and is fixed on the outside of the treatment tank 100. The ring structure can be easily connected to multiple collection pipes 320, and the installation on the outside facilitates subsequent maintenance and cleaning. A sediment discharge pipe 331 is connected to the outside of the collection pipe 330. The sediment discharge pipe 331 is used to discharge the sediment in the collection pipe 330. A valve 332 is provided at the end of the sediment discharge pipe 331. The valve 332 can control the timing of sediment discharge to avoid random discharge of sediment and prevent wastewater from leaking from the discharge pipe.

[0027] In this embodiment, the self-circulating airlift CO2 carbon fixation wastewater treatment device first injects the wastewater to be treated into the treatment tank 100 through the wastewater injection pipe 111, observing the liquid level through the observation window 150 until the wastewater level submerges the top of the airlift pipe 120. Then, the wastewater injection pipe 111 is closed to provide a stable wastewater environment for the carbon fixation reaction. Next, CO2 gas is continuously introduced from the main gas supply pipe 210. The CO2 flows into the ring pipe 222 through the gas supply branch pipe 211, riser pipe 221, and connecting pipe 2221, and is then ejected from the jet nozzle 2222. The ejected CO2 gas drives the impeller 223 to rotate around the baffle 2223 and the rotating seat 2231. The float 2232 counteracts the gravity of the impeller 223, making its rotation smooth. The rotating impeller 223 disperses the CO2 gas into fine bubbles, increasing the contact area between CO2 and wastewater. Then, the density of the gas-liquid mixture after aeration in the airlift pipe 120 decreases and flows towards the airlift pipe 120. The unaerated wastewater between the treatment tank 100 and the air-lift pipe 120 flows back to the bottom of the air-lift pipe 120 under the action of liquid level difference and air-lift force, through the receiving hopper 131, connecting pipe 133, circulation pipe 132 and outlet convex pipe 1321, forming a stable self-circulation. During the circulation process, the wastewater flows through the vertically permeable cavity separated by the baffle 310. Large carbon-fixing precipitates are intercepted by the filter plate 311 and slide down the inclined filter plate 311 into the collection pipe 320 for accumulation. The staff can observe the accumulation amount through the precipitate observation window 322. Finally, when the precipitate accumulates to the preset amount, the valve 332 is opened, and the precipitate is discharged through the collection pipe 330 and the precipitate discharge pipe 331. After the carbon fixation reaction is completed, the discharge pipe 140 is opened to discharge the treated wastewater. The tail gas that did not participate in the reaction is discharged through the exhaust pipe 112. After closing all valves, the above steps can be repeated for the next batch of wastewater treatment.

[0028] like Figures 1-8 As shown, this embodiment also provides a self-circulating air-stripping CO2 carbon sequestration wastewater treatment method, based on the above-mentioned self-circulating air-stripping CO2 carbon sequestration wastewater treatment device, including the following steps: S1. Wastewater injection: Inject the wastewater to be treated into the treatment tank 100 through the wastewater injection pipe 111 on the tank cover 110. Observe the liquid level through the liquid level observation window 150 until the wastewater level submerges the top of the air lift pipe 120, and then close the wastewater injection pipe 111. S2, CO2 gas supply: CO2 gas is continuously introduced from the main gas supply pipe 210. The CO2 flows into the ring pipe 222 in sequence along the main gas supply pipe 210, the branch gas supply pipe 211, the riser pipe 221, and the connecting pipe 2221, and finally sprays upward from several nozzles 2222 at the top of the ring pipe 222. S3. Aeration and impeller rotation: CO2 gas ejected from the jet nozzle 2222 is sprayed towards the underside of the blades of the impeller 223, driving the impeller 223 to rotate around the baffle 2223 and the rotating seat 2231. The rotating impeller 223 breaks the CO2 gas into fine bubbles, increasing the contact area between CO2 and wastewater and improving the aeration effect. The float ball 2232 rotates synchronously with the impeller 223 to help stabilize the rotation posture of the impeller 223. S4. Self-circulation formation: After the wastewater in the air-lift pipe 120 is aerated, the density of the gas-liquid mixture decreases and it surges upward. The unaerated wastewater between the treatment tank 100 and the air-lift pipe 120 flows into the receiving hopper 131 surrounding the bottom of the air-lift pipe 120 under the action of the liquid level difference and the air-lift force. It then flows into the annular circulation pipe 132 at the bottom of the inner side of the air-lift pipe 120 through the connecting pipe 133. Finally, it is discharged into the bottom of the air-lift pipe 120 through several outlet protrusions 1321 outside the circulation pipe 132, forming a stable self-circulation. S5. Sedimentation interception and collection: During the self-circulation process, the wastewater surging at the top of the air-lift pipe 120 flows to the annular area between the air-lift pipe 120 and the inner wall of the treatment tank 100. Through the vertically permeable cavity formed by several partitions 310, the larger carbon precipitates in the wastewater are intercepted by the filter plates 311 in the cavity. The precipitates slide down the 30°-45° inclined surface of the filter plates 311 and enter the corresponding collection pipe 320 through the connecting seat 321 for accumulation. The amount of precipitate accumulation can be observed through the precipitate observation window 322 on the collection pipe 320. S6. Sediment discharge: When the sediment in the collection pipe 320 accumulates to a preset amount, the valve 332 at the end of the sediment discharge pipe 331 is opened, and the sediment in each collection pipe 320 is collected through the collection pipe 330 and discharged from the sediment discharge pipe 331. S7. Wastewater discharge after treatment: After the carbon fixation reaction is completed and the precipitate is collected and discharged, open the discharge pipe 140 at the bottom of the treatment tank 100 and discharge the qualified wastewater from the bottom of the air lift pipe 120. After the discharge is completed, close the discharge pipe 140 to complete a single wastewater treatment. Repeat the above steps to treat the next batch of wastewater. S8. Exhaust gas discharge: CO2 gas that did not participate in the carbon fixation reaction during the reaction is discharged through the exhaust pipe 112 on the tank cover 110 to avoid excessive gas pressure in the treatment tank 100 affecting the self-circulation.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-circulation gas stripping type CO2 carbon sequestration wastewater treatment device, comprising a treatment tank (100), a tank cover (110) is installed at the top end of the treatment tank (100), characterized in that: The processing tank (100) has an air-lift pipe (120) fixed inside. A circulation assembly (130) is provided at the bottom of the air-lift pipe (120). The circulation assembly (130) includes several receiving hoppers (131) that surround the bottom of the air-lift pipe (120) and the inner wall of the processing tank (100), and an annular circulation pipe (132) that is located at the bottom of the inner side of the air-lift pipe (120) and connected to the receiving hoppers (131). Several water outlet protrusions (1321) are connected to the outside of the circulation pipe (132). The treatment tank (100) is provided with an air lifting mechanism (200). The air lifting mechanism (200) includes an air supply main pipe (210) and a number of aeration components (220) arranged in the air lifting pipe (120). The aeration components (220) include a riser (221), a ring pipe (222) connected to the top of the riser (221), and an impeller (223) rotatably connected to the top of the ring pipe (222). A number of jet nozzles (2222) are installed on the top of the ring pipe (222). The processing tank (100) is also provided with a sedimentation collection mechanism (300). The sedimentation collection mechanism (300) includes several partitions (310) fixed between the top outer wall of the gas lift pipe (120) and the inner wall of the processing tank (100) and several collection pipes (320) installed outside the processing tank (100). A filter plate (311) is fixed between two adjacent partitions (310). The space between the collection pipe (320) and the two adjacent partitions (310) is connected. The bottom ends of several collection pipes (320) are connected to the same collection pipe (330).

2. The self-circulation gas stripping type CO2 carbon sequestration wastewater treatment device according to claim 1, characterized in that: The top of the tank cover (110) is connected to a wastewater injection pipe (111) and an exhaust pipe (112). The end of the exhaust pipe (112) extends into the top of the air-lift pipe (120). The bottom of the treatment tank (100) is connected to a discharge pipe (140). The beginning of the discharge pipe (140) extends into the bottom of the air-lift pipe (120). The liquid level in the treatment tank (100) submerges the top of the air-lift pipe (120). A liquid level observation window (150) is provided at the top of the outer surface of the treatment tank (100).

3. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 1, characterized in that: The air-lift pipe (120) is open at the top and bottom and is located in the middle of the processing tank (100). The bottom end of the air-lift pipe (120) is fixedly connected to the bottom of the processing tank (100). Several collection hoppers (131) are distributed in a ring at equal intervals outside the air-lift pipe (120). Two adjacent collection hoppers (131) are fixedly connected. The bottom end of the collection hopper (131) is connected to the circulation pipe (132) by a connecting pipe (133). The connecting pipe (133) passes through the bottom of the air-lift pipe (120) and is fixedly connected to the air-lift pipe (120).

4. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 1, characterized in that: The main gas supply pipe (210) has a bent pipe structure. At least one of the bends in the main gas supply pipe (210) is higher than the top of the tank cover (110). The end of the main gas supply pipe (210) is connected to several gas supply branch pipes (211). The end of the gas supply branch pipes (211) extends into the lower part of the processing tank (100). The bottom end of the riser pipe (221) penetrates the bottom of the processing tank (100) and is connected to the corresponding gas supply branch pipe (211).

5. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 1, characterized in that: The ring pipe (222) is coaxially sleeved on the top outside of the riser (221). Several connecting pipes (2221) are connected between the top of the riser (221) and the ring pipe (222). The main gas supply pipe (210), the branch gas supply pipe (211), the riser (221), the connecting pipes (2221) and the ring pipe (222) are connected. The water outlet end of the water outlet convex pipe (1321) is lower than the position height of the ring pipe (222).

6. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 1, characterized in that: The impeller (223) is composed of several inclined blades arranged in a ring array with the axis of the riser (221) as the center. Several blades are fixedly connected by a ring rod. A rotating seat (2231) is connected to the center of the impeller (223) by a connecting rod. A T-shaped stop bar (2223) is fixed to the top of the riser (221). The bottom end of the stop bar (2223) passes through the rotating seat (2231) and is rotatably connected to the rotating seat (2231).

7. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 6, characterized in that: Several jet heads (2222) are arranged in a ring with equal spacing around the axis of the ring pipe (222). The head of the jet head (2222) faces the underside of the blade of the impeller (223). A float (2232) is fixed to the top of the rotating seat (2231) with a vertical rod.

8. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 1, characterized in that: Several partitions (310) are vertically fixed between the top outer wall of the air-lift pipe (120) and the inner wall of the treatment tank (100), and are evenly arranged in a ring with equal spacing around the axis of the air-lift pipe (120). The partitions (310) divide the annular area between the top of the air-lift pipe (120) and the inner wall of the treatment tank (100) into multiple vertically permeable cavities with the same structure. Filter plates (311) are fixed in an inclined state in each vertically permeable cavity. The two sides of the filter plate (311) are fixedly connected to the inner walls of two adjacent partitions (310), and the filter plate (311) is at a 30° angle between the two partitions (310). The collection tubes (320) are set at an angle of 45° to 45°. The number of collection tubes (320) corresponds to the number of vertically permeable cavities. The top of the collection tube (320) is integrally formed with a connecting seat (321). The connecting seat (321) passes through the side wall of the treatment tank (100) and is fixedly connected to the tank wall. The inner end of the connecting seat (321) is connected to the bottom edge of the top surface of the filter plate (311) to receive the sediment trapped on the filter plate (311). A sediment observation window (322) is embedded on the outer side wall of the collection tube (320). The sediment observation window (322) is set along the length of the collection tube (320) to facilitate observation of the amount of sediment accumulation in the tube.

9. The self-circulating air-lift CO2 carbon fixation wastewater treatment device according to claim 1, characterized in that: The collecting pipe (330) has an annular pipe structure and is fixed on the outside of the treatment tank (100). A sediment discharge pipe (331) is connected to the outside of the collecting pipe (330), and a valve (332) is provided at the end of the sediment discharge pipe (331).

10. A method for treating wastewater with self-circulating air-lift CO2 carbon fixation, employing the self-circulating air-lift CO2 carbon fixation wastewater treatment device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Wastewater injection: Inject the wastewater to be treated into the treatment tank (100) through the wastewater injection pipe (111) on the tank cover (110). Observe the liquid level through the liquid level observation window (150) until the wastewater level submerges the top of the air lift pipe (120) and close the wastewater injection pipe (111). S2, CO2 gas supply: CO2 gas is continuously introduced from the main gas supply pipe (210). The CO2 flows into the ring pipe (222) in sequence along the main gas supply pipe (210), the branch gas supply pipe (211), the riser pipe (221), and the connecting pipe (2221), and finally sprays upward from several nozzles (2222) at the top of the ring pipe (222). S3. Aeration and impeller rotation: CO2 gas sprayed from the jet nozzle (2222) is directed towards the underside of the blades of the impeller (223), driving the impeller (223) to rotate around the baffle (2223) and the rotating seat (2231). The rotating impeller (223) breaks the CO2 gas into fine bubbles, increasing the contact area between CO2 and wastewater and improving the aeration effect. The float (2232) rotates synchronously with the impeller (223) to help stabilize the rotation posture of the impeller (223). S4. Self-circulation formation: After the wastewater in the air-lift pipe (120) is aerated, the density of the gas-liquid mixture decreases and it surges upward. The unaerated wastewater between the treatment tank (100) and the air-lift pipe (120) flows into the receiving hopper (131) surrounding the bottom of the air-lift pipe (120) under the action of the liquid level difference and the air-lift force. It then flows into the annular circulation pipe (132) at the bottom of the inner side of the air-lift pipe (120) through the connecting pipe (133), and then is discharged into the bottom of the air-lift pipe (120) through several outlet protrusions (1321) outside the circulation pipe (132), forming a stable self-circulation. S5. Sedimentation interception and collection: During the self-circulation process, the wastewater surging at the top of the air-lift pipe (120) flows to the annular area between the air-lift pipe (120) and the inner wall of the treatment tank (100). The vertically permeable cavity formed by several partitions (310) intercepts the larger carbon precipitates in the wastewater by the filter plates (311) in the cavity. The precipitates slide down the 30°-45° inclined surface of the filter plates (311) and enter the corresponding collection pipe (320) through the connecting seat (321) for accumulation. The amount of precipitate accumulation can be observed through the precipitate observation window (322) on the collection pipe (320). S6. Sediment discharge: When the sediment in the collection pipe (320) accumulates to a preset amount, open the valve (332) at the end of the sediment discharge pipe (331). The sediment in each collection pipe (320) is collected through the collection pipe (330) and discharged from the sediment discharge pipe (331). S7. Wastewater discharge after treatment: After the carbon fixation reaction is completed and the precipitate is collected and discharged, open the discharge pipe (140) at the bottom of the treatment tank (100) and discharge the qualified wastewater from the bottom of the air lift pipe (120). After the discharge is completed, close the discharge pipe (140) to complete a single wastewater treatment. Repeat the above steps to treat the next batch of wastewater. S8. Exhaust gas discharge: CO2 gas that did not participate in the carbon fixation reaction during the reaction is discharged through the exhaust pipe (112) on the tank cover (110) to avoid excessive gas pressure in the treatment tank (100) affecting the self-circulation.

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