A precise aeration device for sewage treatment

Abstract

The present invention discloses a precise aeration device for sewage treatment, which belongs to the field of wastewater treatment. The aeration device includes an air supply pipe, an aeration pump, an aeration pipe assembly and a controller; the aeration pump is connected to the air supply pipe; the aeration pipe assembly includes an aeration main pipe, a sliding protective sleeve and an elastic member; it also includes a pH sensor and an online calcium ion concentration monitor; the aeration pump, the pH sensor and the online calcium ion concentration monitor are electrically connected to the controller respectively. The precise aeration device for sewage treatment provided in this application can be used for the treatment of construction wastewater, and can also be used for the treatment of other industrial wastewaters with large fluctuations in calcium ion concentration (such as mining wastewater). In the process of wastewater treatment, through real-time monitoring and adaptive aeration, the utilization rate of carbon dioxide can be improved, energy consumption can be reduced, and the treatment time can be shortened. It can also improve the sedimentation efficiency and reduce the subsequent deep treatment costs.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a precise aeration device for sewage treatment. Background Art

[0002] In the field of construction wastewater treatment, since construction wastewater is typically alkaline and contains a large amount of calcium ions, the current common purification process includes filtration, neutralization, and advanced treatment. Among them, the neutralization process often uses carbon dioxide aeration, which not only effectively adjusts the pH value of the wastewater but also removes calcium ions in the form of precipitation through chemical reactions, thereby achieving targeted treatment of harmful substances in the wastewater.

[0003] In order to improve the mass transfer efficiency between carbon dioxide and wastewater and achieve efficient and complete neutralization treatment of wastewater, existing technologies often choose to use microbubble carbon dioxide for aeration. By processing carbon dioxide into tiny bubbles, the gas-liquid contact area can be significantly increased, thereby accelerating the neutralization reaction rate. However, in actual applications, it has been found that this technology has a more prominent energy waste problem. This is because the discharge volume and water quality of construction wastewater fluctuate greatly. When the pH value and calcium ion concentration of construction wastewater are at a high level, the use of microbubble carbon dioxide can quickly and efficiently complete the neutralization reaction, giving full play to its mass transfer advantages; but when the pH value and calcium ion concentration of construction wastewater are low, the amount of carbon dioxide required for the neutralization reaction in the wastewater is greatly reduced. At this time, continuing to use microbubble carbon dioxide for aeration will not only fail to further improve the treatment effect, but because the generation of microbubble carbon dioxide requires a higher-power pump to provide power, the pump will continue to operate at high load, resulting in unnecessary energy consumption, which significantly reduces the energy efficiency of the overall treatment process.

[0004] It can be seen that the existing carbon dioxide aeration neutralization treatment technology for construction wastewater cannot adapt to the dynamic changes in wastewater quality or the dynamic changes in wastewater volume, and has the defect of low energy efficiency. It is urgent to develop a new type of construction wastewater treatment device that can adjust the treatment parameters in real time according to the wastewater quality and effectively reduce energy consumption. Summary of the Invention

[0005] The present invention discloses a precise aeration device for sewage treatment, which aims to solve the technical problems of the precise aeration device for sewage treatment in the prior art, namely, failure to adapt to dynamic changes in wastewater quality and low energy efficiency.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present application provides a precision aeration device for sewage treatment, comprising an air supply pipe, an aeration pump, an aeration pipe assembly, and a controller; the aeration pump is connected to the air supply pipe; the aeration pipe assembly comprises an aeration main pipe, a sliding protective sleeve, and an elastic member;

[0008] The aeration main pipe is coaxially sleeved on the outside of the end of the air supply pipe, and a gap is formed between the aeration main pipe and the air supply pipe; the end of the aeration main pipe away from the end of the air supply pipe is a closed end, and the end of the aeration main pipe close to the end of the air supply pipe is an open end; a first aeration hole is opened on the wall of the aeration main pipe;

[0009] The sliding protective sleeve is coaxially slidably mounted on the outside of the main aeration pipe, and a second aeration hole corresponding to the first aeration hole is formed on the wall of the sliding protective sleeve. The end of the sliding protective sleeve extends beyond the end of the air supply pipe, and the end of the sliding protective sleeve is a closed end, and together with the air supply pipe and the main aeration pipe, forms a sealed aeration cavity.

[0010] One end of the elastic member is fixedly connected to the sliding protective sleeve, and the other end thereof is fixed, and is used to provide a reset pulling force in the opposite direction to the gas pressure;

[0011] It also includes a pH sensor for monitoring the pH of the wastewater and an online calcium ion concentration monitor for monitoring the calcium ion concentration in the wastewater;

[0012] The aeration pump, pH sensor, and calcium ion concentration online monitor are electrically connected to the controller respectively;

[0013] When the compressed gas continues to flow into the aeration cavity, the compressed gas pushes the sliding protective sleeve to overcome the pulling force of the elastic member and slide, so that the first aeration hole is connected with the second aeration hole to form an aeration through hole.

[0014] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0015] The precise aeration device for sewage treatment provided in this application can be used to treat construction wastewater, as well as other industrial wastewater with large fluctuations in calcium ion concentration (such as mining wastewater). During the wastewater treatment process, through real-time monitoring and adaptive aeration, the utilization rate of carbon dioxide can be improved, energy consumption can be reduced, treatment time can be shortened, sedimentation efficiency can be improved, and subsequent deep treatment costs can be reduced. Specifically, it has the following advantages:

[0016] (1) Precise control of the aeration process is achieved through a pressure adaptive adjustment mechanism (sliding protective cover + elastic part) and a real-time water quality monitoring system (pH sensor + calcium ion concentration online monitor). When the wastewater neutralization demand is high (high pH, ​​high calcium ion concentration), the aeration volume can be automatically increased; when the demand is low, the aeration volume can be automatically reduced, avoiding energy waste.

[0017] (2) The controller integrates the pH sensor data, the calcium ion concentration online monitor data and the aeration pump control to form a closed-loop control system, which dynamically adjusts the aeration parameters according to the pH value and calcium ion concentration, thereby improving the aeration treatment efficiency and stability. Specifically, the pH sensor and calcium ion concentration online monitor can monitor the dynamic changes of the wastewater pH value and calcium ion concentration in real time, which can provide a basis for the controller's decision-making; for example, when the calcium ion concentration drops rapidly, the neutralization reaction progress can be predicted and the aeration volume can be adjusted in advance; when the pH value drops slowly, the aeration intensity is automatically increased to accelerate the reaction process. This application can greatly reduce energy consumption compared to the traditional constant power aeration method by accurately matching the aeration volume with the treatment requirements. At the same time, the pH sensor and calcium ion concentration online monitor replace the traditional manual sampling and detection, which can reduce operating errors and hysteresis and improve treatment accuracy.

[0018] (3) The gas flow rate can be adjusted steplessly by adjusting the alignment of the first and second aeration holes. Compared with traditional fixed-aperture aeration heads, the gas-liquid contact area can be dynamically adjusted according to demand, providing sufficient mass transfer efficiency during high-demand phases and reducing ineffective aeration during low-demand phases. At the same time, the axial sliding of the sliding protective sleeve can scrape off sediment (such as calcium carbonate) on the surface of the aeration main pipe, reducing the risk of blockage and extending the life of the equipment.

[0019] (4) The tension of the elastic member forms a balance with the gas pressure, making the opening and closing of the aeration hole sensitive to pressure changes. For example, when the wastewater is nearing the end of neutralization, a slight drop in pressure can trigger the elastic member to reset, reducing the aeration volume in time and avoiding energy waste. No complex electric or hydraulic actuator is required, and automatic adjustment is achieved only by mechanical force, reducing equipment cost and maintenance difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of Example 1 of the present application;

[0021] Figure 2 yes Figure 1 A top view of

[0022] Figure 3 This is a schematic diagram of the installation of the air supply pipe and the aeration assembly in Example 1 of the present application;

[0023] Figure 4 yes Figure 3 A magnified schematic diagram of part B in the middle;

[0024] Figure 5 yes Figure 3 Cross-sectional view of AA;

[0025] Figure 6 yes Figure 5 Enlarged schematic diagram of the middle C part;

[0026] Figure 7 yes Figure 5 Enlarged schematic diagram of the middle D part;

[0027] Figure 8 This is a schematic structural diagram of the aeration main pipe in Example 1 of the present application;

[0028] Figure 9 yes Figure 8 Cross-sectional view of EE;

[0029] Figure 10 This is a schematic diagram of the connection between the slider assembly and the aeration main pipe;

[0030] Figure 11 yes Figure 10 Enlarged schematic diagram of the middle F part;

[0031] Figure 12 It is the left view of 10;

[0032] Figure 13 Schematic diagram of the formation of aeration holes during the sliding protective cover sliding in the direction of arrow a in Example 1;

[0033] Figure 14 (1) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow a in Example 1 Figure 1 ;

[0034] Figure 14 (2) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow a in Example 1 Figure 2 ;

[0035] Figure 14 (3) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow a in Example 1 Figure 3 ;

[0036] Figure 14 (4) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow a in Example 1 Figure 4 ;

[0037] Figure 15 Schematic diagram of the formation of aeration holes during the sliding of the sliding protective cover in the direction of arrow b in Example 1;

[0038] Figure 16 (1) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow b in Example 1 Figure 1 ;

[0039] Figure 16 (2) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow b in Example 1 Figure 2 ;

[0040] Figure 16 (3) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow b in Example 1 Figure 3 ;

[0041] Figure 16 (4) is a schematic diagram of the state in which the sliding protective cover slides in the direction of arrow b in Example 1 Figure 4 ;

[0042] Figure 17 This is a schematic diagram of the installation of the aeration device in Example 1 of the present application;

[0043] Figure 18 yes Figure 17 An enlarged schematic diagram of the middle G section;

[0044] Figure 19 This is a schematic diagram of the installation of the aeration component;

[0045] Figure 20 It is a structural diagram of Example 2.

[0046] In the figure: 10, air supply pipe; 20, aeration pump; 30, aeration main pipe; 40, sliding protective cover; 50, elastic member; 60, first aeration hole; 70, second aeration hole; 80, pH sensor; 90, calcium ion concentration online monitor; 100, flow sensor; 110, air source; 120, pure carbon dioxide source; 130, first air supply branch pipe; 140, second air supply branch pipe; 150, first air supply valve; 16 0. Second air supply valve; 170. Sliding strip; 180. Third aeration hole; 190. Elastic sealing ring; 200. Pressure sensor; 210. Sealing sleeve; 220. Tank body; 230. Water inlet; 240. Water outlet; 250. Mud discharge port; 260. Gap; 270. First annular sealing strip; 280. Second annular sealing strip; 290. Third annular sealing strip; 300. Aeration hole; 310. Water inlet pipe. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0048] like Figures 1-20 :

[0049] Example 1:

[0050] The present application provides a precise aeration device for sewage treatment, comprising an air supply pipe 10, an aeration pump 20, an aeration pipe assembly, and a controller; the aeration pump 20 is connected to the air supply pipe 10;

[0051] The aeration pipe assembly includes an aeration main pipe 30, a sliding protective cover 40 and an elastic member 50;

[0052] The aeration main pipe 30 is coaxially sleeved on the outside of the end of the air supply pipe 10, with a gap 260 between the aeration main pipe 30 and the air supply pipe 10. The purpose of providing this gap 260 is to leave a channel for air flow. The end of the aeration main pipe 30 away from the end of the air supply pipe 10 is a closed end, and the end of the aeration main pipe 30 close to the end of the air supply pipe 10 is an open end. The wall of the aeration main pipe 30 is provided with a first aeration hole 60.

[0053] The sliding protective cover 40 is coaxially slidably mounted on the outside of the main aeration pipe 30. The wall of the sliding protective cover 40 is provided with second aeration holes 70 corresponding to the first aeration holes 60. The distal end of the sliding protective cover 40 extends beyond the distal end of the air supply pipe 10. The distal end of the sliding protective cover 40 is a closed end, and together with the air supply pipe 10 and the main aeration pipe 30, forms a sealed aeration chamber.

[0054] One end of the elastic member 50 is fixedly connected to the sliding protective cover 40 to provide a reset pulling force in the opposite direction to the gas pressure;

[0055] It also includes a pH sensor 80 for monitoring the pH of the wastewater and an online calcium ion concentration monitor 90 for monitoring the calcium ion concentration in the wastewater;

[0056] The aeration pump 20, pH sensor 80, and calcium ion concentration online monitor 90 are electrically connected to the controller respectively;

[0057] When compressed gas continues to flow into the aeration chamber, the compressed gas pushes the sliding protective cover 40 to overcome the pulling force of the elastic member 50 and slide, so that the first aeration hole 60 is connected with the second aeration hole 70 to form the aeration hole 300; when the compressed gas stops flowing into the aeration chamber, the elastic member 50 pulls the sliding protective cover 40 to reset to close the aeration hole 300.

[0058] In some embodiments, the aeration device further includes a flow sensor 100 for detecting the wastewater inlet flow rate, and the flow sensor 100 is electrically connected to the controller. It is understandable that the flow rate of construction wastewater fluctuates greatly, and the required aeration volume is different at different flow rates. The introduction of the flow sensor 100 can enable the aeration device to integrate multiple parameters for more precise control. For example, when the flow rate increases, the aeration volume is increased in time to ensure the treatment effect; when the flow rate decreases, the aeration volume is reduced to avoid energy waste and improve the overall adaptability of the aeration system; the flow sensor 100 can monitor the wastewater inlet flow rate in real time and transmit the data to the controller; the controller combines the flow rate, pH value, and calcium ion concentration data to calculate the appropriate aeration volume, that is, the aeration device can quickly adjust the aeration volume according to the flow rate, pH value, and calcium ion concentration to adapt to the dynamic changes in wastewater volume and water quality.

[0059] In some embodiments, the aeration device further includes an air source system, comprising an air source 110 and a pure carbon dioxide source 120; the air source 110 and the pure carbon dioxide source 120 are respectively connected to a first air supply branch 130 and a second air supply branch 140; the first air supply branch 130 and the second air supply branch 140 are both connected to the air supply pipe 10; the first air supply branch 130 and the second air supply branch 140 are respectively connected to a first air supply valve 150 and a second air supply valve 160; and the first air supply valve 150 and the second air supply valve 160 are each electrically connected to a control device. It is understood that the requirements for carbon dioxide and air vary at different stages of construction wastewater treatment. By combining the air source 110 and the pure carbon dioxide source 120, the gas composition and ratio can be flexibly adjusted to improve treatment efficiency and cost-effectiveness. The first air supply valve 150 and the second air supply valve 160 are controlled by a controller. By adjusting the valve opening, the intake amount of air and pure carbon dioxide is changed. After mixing, the two gases enter the aeration chamber through the air supply pipe 10. For example, during the rapid neutralization phase, the intake of pure carbon dioxide source 120 is increased; during the maintenance phase, the intake of air source 110 is increased. The gas source system in this application enables precise control of gas composition at different processing stages. Precise adjustment of the first and second gas supply valves 150, 160 ensures that the mixed gas ratio meets real-time processing requirements, improving carbon dioxide utilization and reducing processing costs while ensuring effective treatment.

[0060] In some embodiments, the second aeration holes 70 are strip holes arranged along the circumference of the sliding protective cover 40, and the cross-section of the first aeration holes 60 gradually decreases along the direction in which the compressed gas pushes the sliding protective cover 40 to slide; and the circumferential size of the second aeration holes 70 is larger than the circumferential size of the first aeration holes 60, and the axial size of the second aeration holes 70 is smaller than the axial size of the first aeration holes 60.

[0061] See also Figure 13-16When the compressed gas continues to flow into the aeration chamber and the pressure in the aeration chamber exceeds the preset threshold, the pushing force of the compressed gas is greater than the rebound force of the elastic member 50. The compressed gas pushes the sliding protective cover 40 to overcome the pulling force of the elastic member 50 and slide along the direction of arrow a, so that the first aeration hole 60 is connected with the second aeration hole 70 to form the aeration through hole 300. Figure 13 and Figure 15 As shown, the portion where the first aeration hole 60 and the second aeration hole 70 overlap is the aeration through hole 300 formed by the communication. Since the second aeration hole 70 is a strip hole arranged along the circumference of the sliding protective cover 40, the cross section of the first aeration hole 60 gradually decreases along the direction in which the compressed gas pushes the sliding protective cover 40 to slide. Figure 14 Under the thrust of the compressed gas, the sliding protective cover 40 slides along the direction of arrow a. Figure 14 (1) is the initial position. As the sliding protective cover 40 slides along the direction of arrow a, it reaches the following positions: Figure 14 (2) Figure 14 (3) Figure 14 (4) The position shown, Figure 14 The position shown in (4) is the farthest sliding position of the sliding protective cover 40. During the sliding of the sliding protective cover 40 in the direction of arrow a, the bubbles gradually decrease, while the air pressure gradually increases. When the sliding displacement reaches the maximum value, the bubbles are the smallest and the flow rate reaches the maximum, and microbubbles can be generated. As the air pressure gradually decreases, the driving force of the compressed gas is less than the rebound force of the elastic member 50, as shown in FIG. Figure 16 As shown, under the pulling force of the elastic member 50, the sliding protective cover 40 slides along the direction of arrow b. Figure 16 The position shown in (1) is the farthest sliding position of the sliding protective cover 40. As the sliding protective cover 40 slides in the direction of arrow b, it reaches the following positions in sequence: Figure 16 (2) Figure 16 (3) Figure 16 (4) The position shown, Figure 16The position shown in (4) is the initial position. During the sliding of the sliding protective cover 40 in the direction of arrow b, the bubbles gradually increase, while the air pressure gradually decreases until the first aeration hole 60 and the second aeration hole 70 are misaligned and the aeration through hole 300 is closed. The aeration device in this application uses a controller to accurately control the air supply pressure and flow of the aeration pump 20 and the sliding position of the sliding protective cover 40 according to various parameters of the wastewater (such as pH value, ion concentration, water inlet flow, etc.), thereby accurately adjusting the bubble size and aeration intensity. This application realizes dynamic and reversible adjustment of bubble size through the synergistic effect of the pressure-driven sliding adjustment mechanism and the differentiated aeration hole design. It can automatically adjust according to the aeration demand. For example, under high-load conditions (such as wastewater treatment peak), the air pressure can be increased and automatically switched to micro-bubble mode. Compared with fixed-aperture aerators, the aeration efficiency can be greatly improved; while under low-load conditions, the air pressure can be reduced to generate large bubbles. The air supply pressure required for large bubbles is lower, which can reduce energy consumption. Therefore, this application can flexibly adjust aeration parameters according to the real-time status of wastewater, achieve precise aeration, improve wastewater treatment efficiency and quality, and reduce operating costs.

[0062] In some embodiments, the wall of the main aeration pipe 30 is provided with at least one group of first aeration holes 60 parallel to the axial direction.

[0063] In some embodiments, multiple groups of first aeration holes 60 and second aeration holes 70 are provided. The multiple groups of first aeration holes 60 are evenly distributed along the circumference of the main aeration pipe 30, while the multiple groups of second aeration holes 70 are evenly distributed along the circumference of the sliding protective sleeve 40. It is understood that multiple groups of axially parallel first aeration holes 60 can increase the aeration area, allowing gas to more evenly contact the wastewater, thereby improving treatment efficiency. Compressed gas is discharged through the multiple groups of axially parallel first aeration holes 60 on the main aeration pipe 30, creating multiple aeration points within the wastewater treatment area and expanding the gas distribution range. Multiple groups of first aeration holes 60 significantly improve aeration uniformity, ensuring sufficient gas contact across all areas of the wastewater, promoting more uniform and sufficient neutralization reactions and calcium ion precipitation, and enhancing overall treatment efficiency. Multiple groups of first aeration holes 60 and multiple groups of second aeration holes 70 are conveniently evenly distributed along the circumference of the main aeration pipe 30 and sliding protective sleeve 40, further enhancing aeration uniformity and controllability. The circumferentially uniform distribution ensures uniform gas discharge along the circumference. Multiple groups of first aeration holes 60 are evenly distributed along the circumference of the aeration main pipe 30, and multiple groups of second aeration holes 70 are evenly distributed along the circumference of the sliding protective cover 40. As the sliding protective cover 40 slides, the aeration holes at different circumferential locations open and close synchronously, ensuring uniform gas discharge. This circumferentially even distribution of aeration holes ensures more uniform aeration around the circumference, preventing localized under- or over-aeration, ensuring consistent treatment across all wastewater areas, and improving treatment quality.

[0064] In some embodiments, the aeration tube assembly further includes a slide assembly, which includes a plurality of slides 170 fixedly connected to the aeration main pipe 30, each slide 170 being correspondingly arranged on the outside of a group of first aeration holes 60, and each slide 170 being provided with a third aeration hole 180 at a position corresponding to each first aeration hole 60, and the shape and size of the third aeration hole 180 being the same as those of the first aeration hole 60; the inner wall of the sliding protective cover 40 is slidably fitted with the outer surface of the slide 170; an elastic sealing ring 190 is provided on the outer side of the end of the aeration main pipe 30, and the outer surface of the elastic sealing ring 190 is slidably fitted with the inner wall of the sliding protective cover 40; the outer surface of the elastic sealing ring 190 and the inner wall of the sliding protective cover 40 form a dynamic sealing interface through interference fit. It is understood that the slide bar assembly on the aeration main pipe 30 is primarily intended to reduce the contact surface between the sliding protective cover 40 and the aeration main pipe 30 while ensuring aeration function. This reduces friction when the two slide relative to each other, allowing the sliding protective cover 40 to slide more smoothly on the aeration main pipe 30 and thus more sensitively respond to pressure changes within the aeration chamber. Because the slide bar 170 is fixedly connected to the aeration main pipe 30, the third aeration holes 180 formed therein are identical to the first aeration holes 60. When the sliding protective cover 40 slides, gas can be aerated through the aeration through-hole 300 formed by the first aeration holes 60, the third aeration holes 180, and the corresponding second aeration holes 70. The outer surface of the slide bar 170 slides against the inner wall of the sliding protective cover 40, forming an axially movable sealing interface. This allows the sliding protective cover 40 to move axially in response to pressure changes while ensuring a certain degree of sealing, preventing gas leakage through the gap 260 between the sliding protective cover 40 and the aeration main pipe 30. It can be seen that the provision of a sliding bar assembly on the aeration main pipe 30 reduces the friction between the sliding protective sleeve 40 and the aeration main pipe 30, making the sliding more flexible and improving the response speed of the aeration device to pressure changes, thereby being able to more accurately control the size of the aeration through hole 300 and achieve precise aeration. At the same time, the presence of the elastic sealing ring 190 ensures that the gas is mainly discharged from the designed aeration through hole 300, improving the aeration efficiency and reducing the waste caused by gas leakage. The provision of the elastic sealing ring 190 is to form a good seal between the aeration main pipe 30 and the sliding protective sleeve 40, preventing the compressed gas in the aeration chamber from leaking, ensuring that pressure changes can be accurately transmitted to the sliding protective sleeve 40, allowing it to slide according to design requirements, and also avoiding the impact of gas leakage on the wastewater treatment environment. Since the elastic sealing ring 190 is sleeved on the outside of the end of the aeration main pipe 30, its outer surface and the inner wall of the sliding protective sleeve 40 form a dynamic sealing interface through an interference fit.The interference fit creates a certain amount of compression between the elastic sealing ring 190 and the sliding protective sleeve 40, thus creating a sealing effect. The sliding surface of the elastic sealing ring 190 slides against the inner wall of the sliding protective sleeve 40, allowing the sliding protective sleeve 40 to move axially along the aeration main pipe 30 while maintaining a tight seal, thereby controlling the opening and closing of the aeration through-hole 300. When the sliding protective sleeve 40 undergoes axial displacement due to pressure fluctuations, the elastic sealing ring 190 adapts to this displacement through its dynamic sealing interface with the inner wall of the sliding protective sleeve 40, compensating for this axial displacement and maintaining excellent sealing performance. This effectively ensures the sealing of the aeration chamber, enabling the aeration device to function properly and avoiding problems such as unstable pressure and uneven aeration caused by gas leakage.

[0065] In some embodiments, the aeration device further includes a pressure sensor 200 disposed in the aeration chamber, and the pressure sensor 200 is electrically connected to the controller. It is understandable that the pressure in the aeration chamber directly affects the opening and closing of the aeration holes and the aeration volume. Real-time pressure monitoring helps to accurately control the aeration process and prevent abnormal pressure from affecting the treatment effect or damaging the equipment. The pressure sensor 200 monitors the pressure in the aeration chamber in real time and feeds the data back to the controller. The controller adjusts the power of the aeration pump 20 or the opening of the air supply valve according to the pressure data and the preset threshold to maintain pressure stability. The pressure sensor 200 enables the aeration device to sense pressure changes in a timely manner. For example, when the pressure is too high, the controller reduces the power of the aeration pump 20 or closes some of the air supply valves; when the pressure is too low, the aeration volume is increased to ensure that the aeration holes open and close as needed, thereby achieving precise aeration control.

[0066] In some embodiments, the aeration device further includes a sealing sleeve 210 for auxiliary installation. One end of the sealing sleeve 210 is sleeved onto the outside of the sliding protective sleeve 40. The outer wall of the sliding protective sleeve 40 slides with the inner wall of the sealing sleeve 210, forming an axially displaceable dynamic seal. The other end of the sealing sleeve 210 is provided with a connection structure for connecting to an external device. It is understood that the sealing sleeve 210 is primarily used for installation of the aeration assembly. Specifically, the connection structure between the sealing sleeve 210 and the external equipment is a flange, and a first annular sealing groove is provided on the end face of the flange, and a first annular sealing strip 270 is installed in the first annular sealing groove to prevent leakage of gas in the aeration chamber and prevent treated wastewater from seeping into the aeration chamber; the sealing sleeve 210 is further provided with a second annular sealing groove and a third annular sealing groove on the inner wall in contact with the sliding protective cover 40, and a second annular sealing strip 280 and a third annular sealing strip 290 are installed in the second annular sealing groove and the third annular sealing groove, and the inner side surfaces of the second annular sealing strip 280 and the third annular sealing strip 290 form a dynamic sealing interface with the outer wall surface of the sliding protective cover 40 through interference fit, which is also used to prevent leakage of gas in the aeration chamber and prevent treated wastewater from seeping into the aeration chamber.

[0067] In some embodiments, the elastic member 50 is a spring, which, in its initial state, completely covers the first aeration hole 60. It will be appreciated that in the initial state, the sliding protective cover 40 completely covers the first aeration hole 60, preventing unintended gas leakage. Only when certain pressure conditions are met will gas flow through the first and second aeration holes 60, 70, to form the aeration through-hole 300, thereby achieving precise aeration. For example, during construction wastewater treatment, the aeration volume can be precisely controlled based on factors such as the wastewater's alkalinity and calcium ion concentration, improving the utilization rate of gases such as carbon dioxide and achieving better treatment effects such as neutralization and precipitation. The provision of the spring stabilizes the position of the sliding protective cover 40 in its initial state. During device operation, the spring can also buffer the impact of gas pressure changes on the sliding protective cover 40, ensuring smooth sliding of the sliding protective cover 40 on the aeration main pipe 30. This reduces problems such as uneven aeration caused by unstable sliding, thereby improving the operational stability and reliability of the device. In the initial state, the first aeration hole 60 is completely covered, and the aeration hole 300 is formed for aeration only when necessary, thereby avoiding unnecessary gas emissions, reducing the operating energy consumption of equipment such as the aeration pump 20, and achieving energy conservation and consumption reduction. For example, when the wastewater quality is good and the aeration demand is low, the spring keeps the sliding protective cover 40 covering the first aeration hole 60, and no aeration is performed. Only when the water quality changes and aeration is required, the gas pressure overcomes the tension of the elastic member 50 to open the aeration hole 300, effectively reducing energy consumption. Of course, the elastic member 50 is not limited by the present application, and can also be an elastic member 50 of other structures, which can meet the requirements of the initial state so that the sliding protective cover 40 completely covers the first aeration hole 60, has a good rebound pulling effect when a rebound pulling force is required, and can respond in time.

[0068] In some embodiments, the aeration pump 20 comprises any one of a Roots blower, a centrifugal blower, and a screw blower. It will be appreciated that the type of aeration pump 20 can be selected based on the specific wastewater treatment process and operating requirements. The appropriate aeration pump 20 (Roots blower, centrifugal blower, or screw blower) can be selected to provide the aeration pressure and flow rate required to ensure efficient aeration. For example, in processes requiring rapid aeration, the high flow rate of a centrifugal blower can quickly deliver gas into the wastewater, improving aeration efficiency.

[0069] In some embodiments, the controller is a PLC.

[0070] In some embodiments, the aeration device is installed in a neutralization tank for aeration and neutralization treatment of construction wastewater, and the neutralization tank includes a tank body 220;

[0071] The pool body 220 is provided with a water inlet 230, a water outlet 240 and a mud outlet 250; the water inlet 230 is connected to a water inlet pipe 310, and the flow sensor 100 is connected to the water inlet pipe 310;

[0072] The air supply pipe 10 passes through the side wall of the pool body 220 and extends into the pool body 220;

[0073] The aeration pipe assembly is located within the tank body 220. The aeration main pipe 30, the sliding protective sleeve 40, and the sealing sleeve 210 are sequentially connected to the outside of the tank body 220 where the air supply pipe 10 penetrates. The end of the aeration main pipe 30, which is away from the end of the air supply pipe 10, is connected to the inner wall of the tank body 220 to form a closed end. The aeration main pipe 30 and the inner wall of the tank body 220 can be connected by welding or by a flange. One end of the elastic member 50 is connected to the sliding protective sleeve 40, and the other end of the elastic member 50 is connected to the inner wall of the tank body 220.

[0074] The pH sensor 80, the online calcium ion concentration monitor 90 and the pressure sensor 200 are all installed on the pool body 220; and the probes of the pH sensor 80 and the online calcium ion concentration monitor 90 are both extended into the pool body 220 to contact the wastewater, and the probe of the pressure sensor 200 is located in the aeration chamber of the aeration assembly. It can be understood that the aeration device can be used for the treatment of construction wastewater, and can also be used for the treatment of other industrial wastewaters with large fluctuations in calcium ion concentration (such as mining wastewater). When the above-mentioned neutralization tank is used to treat construction wastewater, the three core technologies of pressure-adaptive aeration, real-time water quality feedback, and multiple sealing protection are used to solve the problems of low energy efficiency and poor adaptability of the traditional carbon dioxide aeration process, and to achieve precision, energy saving and reliability in the treatment of construction wastewater. Its technical advantages are particularly suitable for construction wastewater scenarios with large water quality fluctuations and high treatment requirements, and have significant economic and environmental benefits. Specifically, it has the following advantages:

[0075] (1) Precise aeration and energy efficiency optimization are achieved. The elastic member 50 (pre-compression spring) and the sliding protective cover 40 can realize pressure adaptive adjustment. When the pressure in the aeration chamber changes with the wastewater pH value and calcium ion concentration, the aeration hole automatically adjusts the opening and closing degree. For example, in the high pH value stage (>9.5), the spring preload force causes the aeration hole to be initially closed, and a higher air pressure is required to open it. At this time, high-pressure microbubble aeration accelerates the neutralization reaction; in the near-neutral stage (pH7.5-8.5), the air pressure decreases, the spring resets and shrinks the aeration hole, reducing ineffective aeration and avoiding the energy waste of traditional microbubble aeration at low demand. The pH sensor 80 and the calcium ion concentration online monitor 90 work together with the controller to realize real-time water quality feedback control and dynamically adjust the power of the aeration pump 20 according to the wastewater quality. For example, when the calcium ion concentration drops rapidly, the system automatically reduces the aeration volume, so that energy consumption is accurately matched with the treatment demand, achieving energy-saving effects compared with the traditional constant aeration method.

[0076] (2) High structural reliability. The sliding protective sleeve 40 and the sealing sleeve 210 cooperate through dynamic sealing to prevent wastewater in the pool from penetrating into the aeration chamber and avoid gas leakage in the aeration chamber. At the same time, the sliding protective sleeve 40 is allowed to move freely in the axial direction to ensure pressure response sensitivity. The elastic member 50 (spring) is connected to the inner wall of the pool body 220 and is located on the inner side of the sealing sleeve 210 to avoid direct contact with wastewater, extend the service life, and reduce failures caused by corrosion or blockage. During the axial movement of the sliding protective sleeve 40, the calcium carbonate precipitation on the surface of the aeration main pipe 30 (slide 170) can be scraped off, reducing the risk of aeration hole blockage and maintaining aeration uniformity.

[0077] (3) High treatment efficiency and high stability. Multiple groups of circumferentially distributed first aeration holes 60, second aeration holes 70, and third aeration holes 180 cooperate with the axial sliding of the sliding protective sleeve 40 to achieve three-dimensional uniform distribution of gas in the pool. For example, during the rapid neutralization period, a large number of microbubbles are released from the evenly distributed channels, accelerating the reaction of carbon dioxide and alkaline wastewater; during the maintenance period, small-volume precise aeration maintains pH stability. In addition, the flow sensor 100 monitors the water flow in real time and dynamically adjusts the aeration volume based on water quality data, so that the aeration device can adapt to fluctuations in the discharge of construction wastewater. For example, when the flow rate suddenly increases, the aeration device can automatically increase the power of the aeration pump 20 to ensure that the treatment effect is not affected and maintain a stable aeration treatment effect.

[0078] (4) Easy maintenance and reduced maintenance costs. The aeration device is connected to the tank body 220 through the sealing sleeve 210, which facilitates equipment maintenance and upgrades. For example, when the aeration main pipe 30 or the sliding protective sleeve 40 is worn, it can be quickly disassembled and repaired, reducing downtime. The sliding protective sleeve 40 and the sealing sleeve 210 cooperate through dynamic sealing to prevent wastewater from eroding the aeration components. The protective design of key components such as the elastic member 50 reduces the failure rate, reduces the replacement frequency, and reduces operation and maintenance costs.

[0079] (5) The neutralization tank can be directly connected to the existing wastewater treatment process and work in conjunction with filtration, deep treatment and other links. For example, by adjusting the aeration volume, the degree of calcium ion precipitation can be controlled and the load of the subsequent filtration process can be optimized. It also supports mixed air and pure carbon dioxide supply, and the gas source ratio can be switched according to different treatment stages. For example, high-concentration carbon dioxide is used in the rapid neutralization period, and air is mixed in the maintenance period to reduce costs and improve process economy.

[0080] The aeration and neutralization treatment of construction wastewater in a neutralization tank includes the following steps:

[0081] 1. Preprocessing

[0082] Impurity filtration: Construction wastewater first passes through a screen to intercept larger solid impurities (such as gravel and wood chips), and then passes through a grit chamber to remove sand and other inorganic particles to prevent clogging of pipes and equipment.

[0083] Equipment debugging: Start the pH sensor 80, flow sensor 100, and calcium ion concentration online monitor 90, and calibrate the data; check the opening and closing status of the air source 110 and pure carbon dioxide source 120 valves; test the aeration pump 20, controller and pipeline sealing to ensure the normal operation of the system.

[0084] 2. Real-time monitoring and parameter determination

[0085] Data collection:

[0086] pH sensor 80: monitors the pH value of wastewater in the tank body 220 in real time and uploads data to the controller every 30 seconds.

[0087] Flow sensor 100: continuously monitors the water inlet flow, updates data every second, and calculates the water inlet volume per unit time.

[0088] Calcium ion concentration online monitor 90: measures calcium ion concentration every 15 minutes and transmits the data to the controller.

[0089] Working condition judgment: The controller analyzes real-time data based on preset thresholds to determine the treatment stage of the wastewater (rapid neutralization period, transition period, maintenance period).

[0090] 3. Aeration Neutralization Treatment

[0091] S1. Phase 1: Rapid Neutralization

[0092] Triggering conditions: Based on the feedback from the pH sensor 80, the controller starts this stage when the wastewater pH is > 9.5 and the calcium ion concentration is higher than 80% of the initial value;

[0093] Aeration control: close the first air supply valve 150 of the air source 110, fully open the second air supply valve 160 of the pure carbon dioxide source 120, start the aeration pump 20, and deliver pure carbon dioxide at the maximum flow rate; at the same time, dynamically adjust the aeration intensity according to the influent flow rate of the wastewater: when the flow rate is ≤10m 3 / h, the aeration pump 20 power is set to 75%-85%; the flow rate increases by 5m 3 / h, the power is increased by 5%-10% for rapid neutralization;

[0094] Parameter monitoring: Continuously monitor the pH value and calcium ion concentration of wastewater. When the pH value of wastewater drops to 8.5-9.0 and the calcium ion concentration drops to 50%-60% of the initial value, the transition period begins.

[0095] S2. The second stage: transition period

[0096] Aeration control: Gradually open the first air supply valve 150 of the air source 110, and simultaneously reduce the opening of the second air supply valve 160 of the pure carbon dioxide source 120 by 3%-8% every 10 minutes to form mixed aeration; the initial mixing ratio is set to carbon dioxide: air = 6-7:3-4, and fine-tune according to pH changes: if the pH drops by more than 0.3 every 10 minutes, increase the air ratio by 4%-6%; if the pH drops by less than 0.3 every 10 minutes, increase the carbon dioxide ratio by 2%-4%;

[0097] Parameter monitoring: Real-time monitoring of calcium ion concentration. When the calcium ion concentration drops to 30%-40% of the initial value and the pH value enters the range of 7.5-8.5, the maintenance period begins.

[0098] S3. The third stage: maintenance period

[0099] Aeration control: The proportion of pure carbon dioxide source 120 is controlled to be less than 10%, and mixed aeration is performed mainly with air source 110. The controller fine-tunes the aeration parameters every 10 minutes based on the feedback from pH sensor 80: if the pH is greater than 8.5, the proportion of carbon dioxide is increased by 1%-3%; if the pH is less than 7.5, the opening of the first air supply valve 150 of the air source 110 is increased to increase the air flow rate;

[0100] Parameter monitoring and compliance judgment: When the pH value is stable at 7.5-8.5 for 30 consecutive minutes and the calcium ion concentration reaches the discharge standard, maintain the current aeration parameters for 30-60 minutes to ensure stable water quality.

[0101] 4. Post-processing and equipment maintenance

[0102] Drainage and sludge removal: Open the upper outlet valve 240 to discharge the treated wastewater into a subsequent deep treatment unit (such as a sedimentation tank). Regularly (1-2 times a week) open the sludge valve at the bottom of the tank to remove the precipitated calcium carbonate sludge to prevent sludge accumulation that may affect treatment effectiveness.

[0103] Equipment maintenance: Clean the probes of the pH sensor 80 and the online calcium ion concentration monitor 90 to prevent contaminants from sticking and affecting accuracy. Check the aeration pipes and valves for blockage or corrosion, and clean any debris from the aeration heads. Check the operating status of the aeration pump 20 and replace worn parts promptly.

[0104] Data archiving: The pH value, flow rate, calcium ion concentration data and equipment operating parameters of each stage are archived for analyzing treatment efficiency and optimizing process parameters.

[0105] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A precision aeration device for sewage treatment, characterized in that: It includes an air supply pipe, an aeration pump, an aeration pipe assembly and a controller; the aeration pump is connected to the air supply pipe; the aeration pipe assembly includes an aeration main pipe, a sliding protective cover and an elastic member; The aeration main pipe is coaxially sleeved on the outside of the end of the air supply pipe, and a gap is formed between the aeration main pipe and the air supply pipe; the end of the aeration main pipe away from the end of the air supply pipe is a closed end, and the end of the aeration main pipe close to the end of the air supply pipe is an open end; a first aeration hole is opened on the wall of the aeration main pipe; The sliding protective sleeve is coaxially slidably mounted on the outside of the main aeration pipe, and a second aeration hole corresponding to the first aeration hole is formed on the wall of the sliding protective sleeve. The end of the sliding protective sleeve extends beyond the end of the air supply pipe, and the end of the sliding protective sleeve is a closed end, and together with the air supply pipe and the main aeration pipe, forms a sealed aeration cavity. One end of the elastic member is fixedly connected to the sliding protective sleeve, and is used to provide a reset pulling force in the opposite direction to the gas pressure; It also includes a pH sensor for monitoring the pH of the wastewater and an online calcium ion concentration monitor for monitoring the calcium ion concentration in the wastewater; The aeration pump, pH sensor, and calcium ion concentration online monitor are electrically connected to the controller respectively; When the compressed gas continues to flow into the aeration cavity, the compressed gas pushes the sliding protective sleeve to overcome the pulling force of the elastic member and slide, so that the first aeration hole is connected with the second aeration hole to form an aeration through hole.

2. The precise aeration device for sewage treatment according to claim 1, characterized in that: The aeration device further includes a flow sensor for detecting the wastewater inlet flow rate, and the flow sensor is electrically connected to the controller.

3. The precise aeration device for sewage treatment according to claim 2, characterized in that: The aeration device also includes an air source system, which includes an air source and a pure carbon dioxide source; the air source and the pure carbon dioxide source are respectively connected to a first air supply branch and a second air supply branch; the first air supply branch and the second air supply branch are both connected to the air supply pipe; the first air supply branch and the second air supply branch are respectively connected to a first air supply valve and a second air supply valve; the first air supply valve and the second air supply valve are respectively electrically connected to a control device.

4. The precise aeration device for sewage treatment according to claim 3, characterized in that: The second aeration holes are strip holes arranged along the circumference of the sliding protective cover, and the cross-section of the first aeration holes gradually decreases along the direction in which the compressed gas pushes the sliding protective cover to slide; and the circumferential size of the second aeration holes is larger than the circumferential size of the first aeration holes, and the axial size of the second aeration holes is smaller than the axial size of the first aeration holes.

5. The precise aeration device for sewage treatment according to claim 4, characterized in that: The wall of the aeration main pipe is provided with at least one group of first aeration holes parallel to the axial direction.

6. The precise aeration device for sewage treatment according to claim 5, characterized in that: There are multiple groups of the first aeration holes and the second aeration holes. The multiple groups of first aeration holes are evenly distributed along the circumference of the aeration main pipe, and the multiple groups of second aeration holes are evenly distributed along the circumference of the sliding protection sleeve.

7. The precise aeration device for sewage treatment according to claim 6, characterized in that: The aeration pipe assembly also includes a slide assembly, which includes a plurality of slides fixedly connected to the aeration main pipe, each slide is correspondingly arranged on the outside of a group of first aeration holes, and each slide is provided with a third aeration hole at a position corresponding to each first aeration hole, and the shape and size of the third aeration hole are the same as those of the first aeration hole; the inner wall of the sliding protective cover is slidably fitted with the outer surface of the slide; an elastic sealing ring is provided on the outer side of the end of the aeration main pipe, and the outer side surface of the elastic sealing ring is slidably fitted with the inner wall of the sliding protective cover; the outer side surface of the elastic sealing ring and the inner wall surface of the sliding protective cover form a dynamic sealing interface through interference fit.

8. The precise aeration device for sewage treatment according to claim 7, characterized in that: The aeration device further comprises a pressure sensor disposed in the aeration cavity, and the pressure sensor is electrically connected to the controller; And / or, the aeration device further comprises a sealing sleeve for auxiliary installation, one end of the sealing sleeve being sleeved on the outside of the sliding protective sleeve, and the outer wall of the sliding protective sleeve being slidably engaged with the inner wall of the sealing sleeve to form an axially displaceable dynamic seal; the other end of the sealing sleeve is provided with a connection structure for connecting to an external device; And / or, the elastic member is a spring, and in its initial state, the sliding protective cover completely covers the first aeration hole; And / or, the aeration pump includes any one of a Roots blower, a centrifugal blower and a screw blower; And / or, the controller is a PLC.

9. The precise aeration device for sewage treatment according to claim 8, characterized in that: The aeration device is installed in the neutralization tank for aeration and neutralization treatment of construction wastewater, and the neutralization tank includes a tank body; Wherein, the pool body is provided with a water inlet, a water outlet and a mud outlet; the water inlet is connected to a water inlet pipe, and the flow sensor is connected to the water inlet pipe; The air supply pipe penetrates the side wall of the pool body and extends into the pool body; The aeration pipe assembly is located in the tank body, and the aeration main pipe, sliding protective sleeve, and sealing sleeve are sequentially connected to the outside of the tank body where the air supply pipe passes through; the end of the aeration main pipe away from the end of the air supply pipe is connected to the inner wall of the tank body to form a closed end; one end of the elastic member is connected to the sliding protective sleeve, and the other end of the elastic member is connected to the inner wall of the tank body; The pH sensor, calcium ion concentration online monitor and pressure sensor are all installed on the pool body; and the probes of the pH sensor and calcium ion concentration online monitor are both extended into the pool body to contact the wastewater, and the probe of the pressure sensor is located in the aeration cavity of the aeration component.

10. The precise aeration device for sewage treatment according to claim 9, characterized in that: The aeration and neutralization treatment of the construction wastewater comprises the following steps: S1. Phase 1: Rapid Neutralization Trigger condition: Based on the feedback from the pH sensor, the controller starts this stage when the wastewater pH is greater than 9.5 and the calcium ion concentration is higher than 80% of the initial value; Aeration control: close the first air supply valve of the air source, fully open the second air supply valve of the pure carbon dioxide source, start the aeration pump, and deliver pure carbon dioxide at the maximum flow rate; at the same time, dynamically adjust the aeration intensity according to the inlet flow rate of the wastewater: when the flow rate is ≤10m 3 / h, the aeration pump power is set to 75%-85%; the flow rate increases by 5m 3 / h, the power is increased by 5%-10% for rapid neutralization; Parameter monitoring: Continuously monitor the pH value and calcium ion concentration of wastewater. When the pH value of wastewater drops to 8.5-9.0 and the calcium ion concentration drops to 50%-60% of the initial value, the transition period begins. S2. The second stage: transition period Aeration control: Gradually open the first air supply valve of the air source, and at the same time reduce the opening of the second air supply valve of the pure carbon dioxide source by 3%-8% every 10 minutes to form mixed aeration; the initial mixing ratio is set to carbon dioxide: air = 6-7:3-4, and fine-tune according to pH changes: if the pH drops by more than 0.3 every 10 minutes, increase the air ratio by 4%-6%; if the pH drops by less than 0.3 every 10 minutes, increase the carbon dioxide ratio by 2%-4%; Parameter monitoring: Real-time monitoring of calcium ion concentration. When the calcium ion concentration drops to 30%-40% of the initial value and the pH value enters the range of 7.5-8.5, the maintenance period begins. S3. The third stage: maintenance period Aeration control: The proportion of pure carbon dioxide source is controlled to be less than 10%, and mixed aeration is mainly carried out with air source. The controller fine-tunes the aeration parameters every 10 minutes based on the feedback from the pH sensor: if the pH is greater than 8.5, the proportion of carbon dioxide is increased by 1%-3%; if the pH is less than 7.5, the opening of the first air supply valve of the air source is increased to increase the air flow rate. Parameter monitoring and compliance judgment: When the pH value is stable at 7.5-8.5 for 30 consecutive minutes and the calcium ion concentration reaches the emission standard, maintain the current aeration parameters for 30-60 minutes.

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