Polyaluminum chloride production wastewater zero discharge treatment process and recycling system

Abstract

The application discloses a kind of polyaluminum chloride production wastewater zero discharge treatment process and recycling system, it is related to wastewater treatment technical field, including grid pretreatment mechanism, sand trap assembly, primary sedimentation tank mechanism, reaction tank mechanism, secondary sedimentation tank mechanism and fine filtering mechanism.The application is through wastewater and enters the sand trap pool body by inlet conduit, the inertia effect will make water flow continue to spiral path and continue to flow downward, mud and sand are more easily deposited to pool edge, avoid pool bottom middle part and deposit too much mud and sand, by the multiple arc-shaped inclined surfaces of sedimentation frame, thereby increase the adhesion area of mud and sand, and then effectively prevent excessive mud and sand particles from depositing in the pool bottom and forming a sand plate, solve the problem that sand plate is difficult to clean and block the sand outlet, by multiple inverted conical sand trap, form downward vortex, so that the deposited mud and sand can be discharged in multiple areas at the same time.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a zero-discharge treatment process and recycling system for wastewater from polyaluminum chloride production. Background Technology

[0002] Polyaluminum chloride (PAC) is a commonly used water treatment agent, widely used in water supply, sewage treatment, and industrial water. Its production process generates a large amount of wastewater, which usually contains high concentrations of organic and inorganic substances such as aluminum chloride and aluminum hydroxide. If such wastewater is directly discharged into water bodies, it will cause serious pollution to the water environment, disrupt the ecological balance, affect the survival of aquatic organisms, and may also harm human health through the food chain.

[0003] In the zero-discharge treatment and recycling device for wastewater from polyaluminum chloride production, the existing sedimentation tank has a flat bottom design. When the wastewater settles in the tank, the sand particles have a small attachment area and tend to form sand slabs at the bottom of the tank. Moreover, the existing sedimentation tank has a single sand discharge area, so the distance between the silt near the edge of the sedimentation tank and the sand discharge area is long, which leads to incomplete sand discharge, siltation and blockage in the sand discharge area, and reduces the sand discharge efficiency.

[0004] Therefore, we propose a zero-discharge treatment process and recycling system for polyaluminum chloride production wastewater to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a zero-discharge treatment process and recycling system for polyaluminum chloride production wastewater, in order to solve the problem mentioned in the background art that the sand particles at the bottom of the existing sedimentation tank are prone to agglomeration into sand slabs and that incomplete sand removal is likely to occur.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater, comprising a bar screen pretreatment mechanism, a sedimentation tank assembly, a primary sedimentation tank assembly, a reaction tank assembly, a secondary sedimentation tank assembly, and a fine filtration mechanism. The sedimentation tank assembly is equipped with a sand discharge assembly and an aeration assembly at its bottom. The sedimentation tank assembly includes a sedimentation tank body, and the bottom surface of the sedimentation tank body has multiple sand discharge ports. Each sand discharge port is fixedly connected to a sand hopper at its bottom, and the sand hopper is wider at the top and narrower at the bottom. The sedimentation tank has a sedimentation rack fixedly connected to its inner bottom surface. The sedimentation rack is composed of multiple sedimentation plates, and its narrow top and wide bottom facilitates the adhesion of sand particles. A water inlet pipe is fixedly connected to the inner wall of the sedimentation tank near its top. The sand discharge assembly includes two sand discharge channels. Each sand discharge channel has a sand discharge spiral blade rotatably connected to its inner wall. Multiple sealing plates are fixedly connected to the outer surface of the two sand discharge spiral blades. Each sealing plate corresponds to the position of each sedimentation hopper, and the sealing plate is used to block the material inside the sedimentation hopper.

[0007] Preferably, the inlet pipe is arranged in a spiral shape to generate centrifugal force in the wastewater injected into the sedimentation tank. An installation plate is fixedly connected to the outer surface of the sedimentation tank, and a control panel is provided on the outer surface of the installation plate.

[0008] Preferably, a detection area is fixedly connected to one side of the sedimentation tank near its bottom, and a reinforcing frame is fixedly connected to the outer surface of the sedimentation tank near the detection area. A sediment concentration meter is installed on the outer surface of the reinforcing frame, and the detection probe of the sediment concentration meter is inserted inside the detection area. The sediment concentration meter is used to detect the sediment content inside the sedimentation tank.

[0009] Preferably, the bottom of the sedimentation tank is fixedly connected to support frames near both sides, and a vibration motor is installed at the bottom of the sedimentation tank to loosen the accumulated sand inside the sedimentation tank.

[0010] Preferably, a material conveying assembly is provided between the bar screen pretreatment mechanism, the sedimentation tank assembly, the primary sedimentation tank assembly, the reaction tank assembly, the secondary sedimentation tank assembly, and the fine filtration mechanism. The material conveying assembly includes a conveying pump, the input end of which is fixedly connected to an input pipe, and the output end of which is fixedly connected to an output pipe.

[0011] Preferably, the bar screen pretreatment mechanism is used to remove large suspended solids, floating matter and impurities from the wastewater; the sedimentation tank assembly is used to remove high-density inorganic particles from the wastewater to reduce the inorganic suspended solids content of the wastewater; the primary sedimentation tank mechanism is used to remove settleable organic and inorganic suspended solids from the wastewater; the reaction tank mechanism is used to remove colloids, dissolved organic matter, heavy metals, nitrogen and phosphorus from the wastewater; the secondary sedimentation tank mechanism is used to settle the sludge generated by the reaction to the bottom of the tank by gravity sedimentation; and the fine filtration mechanism further removes fine suspended solids, colloids, microorganisms, some organic matter and dissolved salts from the wastewater.

[0012] Preferably, the plurality of sedimentation buckets are divided into two groups, and the two groups of sedimentation buckets are fixedly connected to the top of the two sand discharge channels respectively. One end of each of the two sand discharge spiral blades is fixedly connected to a positioning turntable, and the outer surface of each of the two positioning turntables is fixedly connected to a sealing rotating block. One end of each of the two sand discharge channels is provided with a rotating hole, and the two sealing rotating blocks rotate on the inner wall of the two rotating holes respectively.

[0013] Preferably, a drive gear is fixedly connected to one side of each of the two sealing rotating blocks, and the outer surfaces of the two drive gears are meshed together. A fixing plate is fixedly connected to the bottom of one of the sand discharge channels, and a drive motor is provided on the top of the fixing plate. The output shaft of the drive motor is fixedly connected to the center of the outer surface of one of the drive gears.

[0014] Preferably, an air injection assembly is fixedly connected between the outer surfaces of the two sand discharge channels. The air injection assembly includes a mounting frame, an air pump is installed inside the mounting frame, a fixed pipe is fixedly connected to the output end of the air pump, a diversion pipe is fixedly connected to one end of the fixed pipe, a connecting pipe is fixedly connected to both ends of the two diversion pipes, an air injection pipe is fixedly connected to both ends of the two connecting pipes, one end of each air injection pipe is fixedly inserted into the interior of the corresponding sand settling hopper, and a one-way valve is installed on the exterior of each air injection pipe.

[0015] A treatment process for a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater includes the following steps:

[0016] S1. Wastewater from polyaluminum chloride production passes sequentially through a bar screen pretreatment mechanism, a sedimentation tank assembly, a primary sedimentation tank mechanism, a reaction tank mechanism, a secondary sedimentation tank mechanism, and a fine filtration mechanism. The wastewater enters the sedimentation tank through a spiral downward inlet pipe. Inertia causes the water to continue flowing downward in a spiral path. The silt in the wastewater settles towards the inner edge of the sedimentation tank. The multiple arc-shaped inclined surfaces of the sedimentation rack increase the adhesion area of ​​the silt. During sand discharge, the silt settled at the bottom of the sedimentation tank is dispersed to the sedimentation outlet. The settled silt is discharged simultaneously through multiple inverted conical sedimentation hoppers.

[0017] S2. By starting the drive motor, the sand discharge spiral blades inside the two sand discharge channels rotate simultaneously, and the mud and sand flowing down through the settling hopper are transported outward and discharged. In particular, by rotating the sand discharge spiral blades, each sealing plate is rotated to the bottom of the corresponding settling hopper and pressed tightly, which can block the bottom of the settling hopper.

[0018] S3. By starting the air pump and opening multiple one-way valves, high-pressure airflow is injected into each sedimentation hopper through the air injection pipe. The pressure of the airflow will push out the sediment accumulated inside the sedimentation hopper, loosening the accumulated sediment. When the air pump is turned off, multiple one-way valves will close simultaneously.

[0019] S4. The sediment concentration is detected by inserting the detection probe of the sediment concentration meter into the detection area. When the sediment concentration is high, it is necessary to discharge the sediment. At this time, the drive motor and air pump are automatically started through the control panel to discharge and loosen the sediment. At the same time, the vibration motor is started. Under the action of vibration, the sediment is assisted to enter the sedimentation port in the eddy current. When the sediment concentration meter detects that the concentration is low, the control panel controls the drive equipment for discharging the sediment to stop.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. During use, wastewater enters the sedimentation tank through the inlet pipe. Inertia causes the water to continue flowing downwards in a spiral path, making it easier for sediment to settle towards the inner edge of the tank. This prevents excessive sediment buildup in the middle of the tank bottom. The multiple curved, inclined surfaces of the sedimentation rack increase the surface area for sediment adhesion, effectively preventing excessive sediment particles from settling at the bottom and forming sand slabs. This solves the problem of difficult-to-clean sand slabs and clogging of the discharge outlet. Multiple inverted conical sedimentation hoppers create a downward vortex, allowing for simultaneous discharge of sediment from multiple areas, thus solving the problem of incomplete sediment removal caused by a single discharge area. The problem of siltation and blockage in the sand discharge area can be solved by improving sand discharge efficiency. By starting the drive motor, the sand discharge spiral blades inside the two sand discharge channels rotate simultaneously, transporting the silt flowing down through the settling hopper to the outside. Each sealing plate rotates to the bottom of the corresponding settling hopper and fits tightly, thus blocking the bottom of the settling hopper and preventing the silt and wastewater inside the settling hopper from leaking out during sedimentation. The wastewater from the production of polyaluminum chloride passes through the bar pretreatment mechanism, settling tank assembly, primary sedimentation tank mechanism, reaction tank mechanism, secondary sedimentation tank mechanism and fine filtration mechanism in sequence, and the final discharged water is clean and can be discharged.

[0022] 2. During use, when wastewater is settling inside the sedimentation tank, the sediment concentration is detected by inserting the probe of the sediment concentration meter into the detection area. When the sediment concentration is high, it is necessary to discharge the sediment to prevent the sediment at the bottom of the tank from forming a slab. The control panel automatically starts the drive motor and air pump to discharge and loosen the sediment. At the same time, the vibration motor is started. Under the action of vibration, the sediment is assisted to enter the sedimentation port in the eddy current. When the sediment concentration meter detects a low concentration, the control panel controls the drive equipment to stop the discharge. This has the advantage of automated discharge and can effectively avoid excessive sedimentation at the bottom of the sedimentation tank.

[0023] 3. When in use, the air pump is started to output high-pressure, high-speed airflow from the fixed pipe. The high-pressure airflow is injected into each sedimentation hopper through the air injection pipe. The pressure of the airflow will push out the sediment accumulated inside the sedimentation hopper, thereby loosening the accumulated sediment and making it easier to discharge the sediment inside the sedimentation tank. Attached Figure Description

[0024] Figure 1 This is a first-view perspective perspective view of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0025] Figure 2 This is a second-view perspective perspective view of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0026] Figure 3 This is a perspective view of a sedimentation tank component of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0027] Figure 4 This is a first-view sectional perspective view of a sedimentation tank component of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0028] Figure 5 This is a second-view sectional perspective view of a sedimentation tank component of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0029] Figure 6 This is a three-dimensional view of the sedimentation tank of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0030] Figure 7 This is a perspective view of the air injection component of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0031] Figure 8 This is a partial sectional perspective view of the sand discharge component of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0032] Figure 9 This is a three-dimensional view of the sand removal component of a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater according to the present invention.

[0033] In the picture:

[0034] 1. Sedimentation Tank Components; 101. Sedimentation Tank Body; 102. Support Frame; 103. Sedimentation Inlet; 104. Mounting Plate; 105. Control Panel; 106. Reinforcing Frame; 107. Sediment Concentration Meter; 108. Detection Area; 109. Sedimentation Rack; 110. Inlet Pipe; 111. Sedimentation Hopper; 112. Vibration Motor; 2. Bar Screen Pretreatment Mechanism; 3. Conveying Assembly; 301. Input Pipe; 302. Conveying Pump; 303. Output Pipe; 4. Primary Sedimentation Tank Mechanism; 5. Reaction Tank 6. Secondary sedimentation tank mechanism; 7. Fine filtration mechanism; 8. Sand discharge assembly; 801. Sand discharge channel; 802. Sand discharge spiral blade; 803. Drive gear; 804. Fixing plate; 805. Drive motor; 806. Rotary hole; 807. Sealing rotating block; 808. Positioning turntable; 809. Sealing plate; 9. Air injection assembly; 901. Mounting bracket; 902. Air pump; 903. Fixing pipe; 904. Diversion pipe; 905. Connecting pipe; 906. Air injection pipe; 907. One-way valve. Detailed Implementation

[0035] 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1: Refer to Figures 1-8As shown, the present invention provides a technical solution: a zero-discharge treatment and recycling system for polyaluminum chloride production wastewater, comprising a bar screen pretreatment mechanism 2, a sedimentation tank assembly 1, a primary sedimentation tank assembly 4, a reaction tank assembly 5, a secondary sedimentation tank assembly 6, and a fine filtration mechanism 7. The bottom of the sedimentation tank assembly 1 is equipped with a sand discharge assembly 8 and an aeration assembly 9. The sedimentation tank assembly 1 includes a sedimentation tank body 101, with multiple sedimentation ports 103 opened on the bottom surface of the sedimentation tank body 101. Each sedimentation port 103 is fixedly connected to a sedimentation hopper 111 at its bottom, and the sedimentation hopper 111 is wider at the top and narrower at the bottom. The sedimentation tank 101 has a narrow design. A sedimentation rack 109 is fixedly connected to the bottom surface of the tank body 101. The sedimentation rack 109 is composed of multiple sedimentation plates, and its narrow top and wide bottom facilitates sand adhesion. An inlet pipe 110 is fixedly connected to the inner wall of the sedimentation tank 101 near its top. The sand discharge assembly 8 includes two sand discharge channels 801. A sand discharge spiral blade 802 is rotatably connected to the inner wall of each sand discharge channel 801. Multiple sealing plates 809 are fixedly connected to the outer surface of both sand discharge spiral blades 802, and each sealing plate 809 corresponds to a position in each sedimentation hopper 111. Furthermore, the sealing plate 809 is used to block the material inside the sedimentation hopper 111. The path of the inlet pipe 110 is spirally arranged to generate centrifugal force in the wastewater injected into the sedimentation tank 101. An installation plate 104 is fixedly connected to the outer surface of the sedimentation tank 101, and a control panel 105 is set on the outer surface of the installation plate 104. The multiple sedimentation hoppers 111 are evenly divided into two groups, and the two groups of sedimentation hoppers 111 are fixedly connected to the top of the two sand discharge channels 801 respectively. One end of each of the two sand discharge spiral blades 802 is fixedly connected to a positioning turntable 808. The two positioning turntables 808... The outer surface of each of the two sand discharge channels 801 is fixedly connected with a sealing rotating block 807. One end of each of the two sand discharge channels 801 is provided with a rotating hole 806. The two sealing rotating blocks 807 rotate on the inner wall of the two rotating holes 806 respectively. One side of each of the two sealing rotating blocks 807 is fixedly connected with a drive gear 803. The outer surfaces of the two drive gears 803 are meshed together. The bottom of one of the sand discharge channels 801 is fixedly connected with a fixing plate 804. The top of the fixing plate 804 is provided with a drive motor 805. The output shaft of the drive motor 805 is fixedly connected to the center of the outer surface of one of the drive gears 803.

[0037] In this embodiment, during use, the wastewater from the production of polyaluminum chloride is injected into the bar screen pretreatment mechanism 2 for the first step of impurity removal. Then, it sequentially passes through the sedimentation tank assembly 1, the primary sedimentation tank mechanism 4, the reaction tank mechanism 5, the secondary sedimentation tank mechanism 6, and the fine filtration mechanism 7. The final discharged water is clean and safe for discharge. Specifically, when the wastewater is transported into the sedimentation tank 101, it enters through the inlet pipe 110. Since the inlet pipe 110 is spirally downward, the water flows rapidly downward in a spiral, and still retains inertia when it exits from the outlet at the bottom of the inlet pipe 110. Inertia causes the water to continue flowing downwards in a spiral path, thus creating centrifugal force. Under this centrifugal force, the silt in the wastewater is more likely to settle towards the inner edge of the sedimentation tank 101, preventing excessive silt from settling in the middle. Under gravity, the silt in the wastewater settles, while the clear water is located in the upper part and is easier to pump out. The multiple arc-shaped inclined surfaces of the sedimentation rack 109 increase the adhesion area of ​​the silt, effectively preventing excessive silt particles from settling on the flat bottom of the sedimentation tank 101 and forming sand slabs, thus solving the problem of difficult-to-clean sand slabs and clogging of the drain. Regarding the issue of sand discharge, when this step is completed and sand needs to be discharged, the interior of the sedimentation tank 101 and the surface of the sedimentation rack 109 are rinsed with high-pressure water. The sediment that has settled to the bottom of the sedimentation tank 101 will be dispersed to the sedimentation outlet 103. Multiple inverted conical sedimentation buckets 111 simultaneously form a downward vortex, thereby discharging the settled sediment from multiple areas at the same time. This solves the problem of incomplete sand discharge and siltation blockage caused by a single sand discharge area, improving sand discharge efficiency. During sand discharge, the drive motor 805 is started, which drives the connected drive gear 803 to rotate. The meshing connection of the two drive gears 803 allows them to rotate simultaneously, thereby driving the sand discharge spiral blades 802 inside the two sand discharge channels 801 to rotate simultaneously. Since the two sand discharge spiral blades 802 are symmetrically arranged, when they rotate simultaneously, they can transport and discharge the silt flowing down through the settling hopper 111. By rotating the sand discharge spiral blades 802, each sealing plate 809 is rotated to fit tightly against the bottom of the corresponding settling hopper 111, thereby blocking the bottom of the settling hopper 111 and preventing the silt and wastewater inside the settling hopper 111 from leaking out during sedimentation.

[0038] Example 2: Figures 1-8As shown, the sedimentation tank body 101 has multiple sedimentation outlets 103 on its inner bottom surface. Each sedimentation outlet 103 has a sedimentation hopper 111 fixedly connected to its bottom, and the sedimentation hopper 111 is wider at the top and narrower at the bottom. An installation plate 104 is fixedly connected to the outer surface of the sedimentation tank body 101, and a control panel 105 is installed on the outer surface of the installation plate 104. A detection area 108 is fixedly connected to one side of the sedimentation tank body 101 near its bottom. The outer surface of the sedimentation tank body 101 near the detection area 108... A reinforcing frame 106 is fixedly connected at position 08. A sediment concentration meter 107 is installed on the outer surface of the reinforcing frame 106. The detection probe of the sediment concentration meter 107 is inserted inside the detection area 108. The sediment concentration meter 107 is used to detect the sediment content inside the sedimentation tank 101. Support frames 102 are fixedly connected to the bottom of the sedimentation tank 101 near both sides. A vibration motor 112 is installed at the bottom of the sedimentation tank 101. The vibration motor 112 is used to loosen the sediment in the sedimentation tank 101. 01. Internal sand accumulation: A conveying assembly 3 is provided between the bar screen pretreatment mechanism 2, the sedimentation tank assembly 1, the primary sedimentation tank assembly 4, the reaction tank assembly 5, the secondary sedimentation tank assembly 6, and the fine filtration mechanism 7. The conveying assembly 3 includes a conveying pump 302. The input end of the conveying pump 302 is fixedly connected to the input pipe 301, and the output end of the conveying pump 302 is fixedly connected to the output pipe 303. The bar screen pretreatment mechanism 2 is used to remove suspended solids, floating matter, and impurities with larger particle sizes in the wastewater. The sedimentation tank assembly 1 is used to remove inorganic particles with higher density in the wastewater to reduce the inorganic suspended solids content of the wastewater. The primary sedimentation tank assembly 4 is used to remove settleable organic and inorganic suspended solids in the wastewater. The reaction tank assembly 5 is used to remove colloids, dissolved organic matter, heavy metals, nitrogen, and phosphorus in the wastewater. The secondary sedimentation tank assembly 6 is used to settle the sludge generated by the reaction to the bottom of the tank by gravity sedimentation. The fine filtration mechanism 7 further removes fine suspended solids, colloids, microorganisms, some organic matter, and dissolved salts in the wastewater.

[0039] In this embodiment, during use, the bar screen pretreatment mechanism 2 removes larger suspended solids, floating matter, branches, plastics, fibers, paper scraps, etc. from the wastewater to prevent blockage or wear of subsequent pipes and equipment, ensuring the stability of system operation. The sedimentation tank component 1 utilizes gravity settling to allow silt particles to settle to the bottom for sand removal. The next step involves conveying the wastewater to the primary sedimentation tank mechanism 4, where gravity causes suspended particles to settle in still water, reducing the pollutant load entering the reaction tank and improving chemical reaction efficiency. Subsequently, in the reaction tank mechanism 5, known chemical reactions remove colloids, dissolved organic matter, heavy metals, nitrogen, phosphorus, and other pollutants from the polyaluminum chloride production wastewater, further purifying the water. The secondary sedimentation tank mechanism 6 separates sludge or flocculants from the effluent of the reaction tank mechanism 5, clarifying the water. Finally, the membrane filtration in the fine filtration mechanism 7 performs deep filtration, achieving zero discharge and ensuring the water quality is recycled. The system utilizes a combination of technologies, including a sediment concentration meter 107, a vibration motor 112, a transfer pump 302, a drive motor 805, and an air pump 902. These components are electrically connected to the control panel 105, which controls their operation. During sedimentation of wastewater inside the sedimentation tank 101, the sediment concentration is detected by inserting the probe of the sediment concentration meter 107 into the detection area 108. When the sediment concentration is high, sediment discharge is necessary to prevent the sediment at the bottom of the tank from forming a slab. The control panel 105 automatically starts the drive motor 805 and the air pump 902 to discharge and loosen the sediment. Simultaneously, the vibration motor 112 is activated, and under vibration, the sediment is assisted to enter the sedimentation port 103 in a vortex. When the sediment concentration meter 107 detects a low concentration, the control panel 105 stops the sediment discharge drive. This automated sediment discharge effectively prevents excessive sediment settling at the bottom of the sedimentation tank 101.

[0040] Example 3: Figures 1-8 As shown, the sedimentation tank assembly 1 includes a sedimentation tank body 101. The bottom surface of the sedimentation tank body 101 has multiple sedimentation ports 103. Each sedimentation port 103 is fixedly connected to a sedimentation hopper 111 at its bottom. The sedimentation hopper 111 is wider at the top and narrower at the bottom. An air injection assembly 9 is fixedly connected between the outer surfaces of two sand discharge channels 801. The air injection assembly 9 includes a mounting frame 901. An air pump 902 is installed inside the mounting frame 901. The output end of the air pump 902 is fixedly connected to a fixed pipe 903. One end of the fixed pipe 903 is fixedly connected to a diversion pipe 904. Both ends of the two diversion pipes 904 are fixedly connected to connecting pipes 905. Both ends of the two connecting pipes 905 are fixedly connected to air injection pipes 906. One end of each air injection pipe 906 is fixedly inserted into the interior of the corresponding sedimentation hopper 111. A one-way valve 907 is installed on the outside of each air injection pipe 906.

[0041] In this embodiment, when in use, excessive sediment deposition inside the sedimentation hopper 111 can easily lead to accumulation. Therefore, by starting the air pump 902, high-pressure, high-speed airflow is output from the fixed pipe 903. The high-pressure airflow is transported through the diversion pipe 904 to the connecting pipes 905 located on both sides. At this time, by opening multiple one-way valves 907, the high-pressure airflow is injected into each sedimentation hopper 111 through the air injection pipe 906. The pressure of the airflow will force out the sediment accumulated inside the sedimentation hopper 111, thereby loosening the accumulated sediment and facilitating the discharge of sediment from the sedimentation tank 101. When the air pump 902 is turned off, multiple one-way valves 907 are closed simultaneously to prevent sediment and wastewater inside the sedimentation hopper 111 from flowing back into the gas delivery pipe, thus preventing blockage in the sand discharge area.

[0042] The treatment process and working principle of this device are as follows: During operation, the pretreatment mechanism 2 removes larger suspended solids, floating matter, branches, plastics, fibers, paper scraps, etc. from the wastewater to prevent blockage or wear of subsequent pipes and equipment, ensuring the stability of system operation. The sedimentation tank component 1 utilizes gravity settling to allow sediment particles to settle to the bottom for cleaning. The sediment is then transported to the primary sedimentation tank component 4, where gravity causes suspended particles to settle in still water, reducing the pollutant load entering the reaction tank and improving chemical reaction efficiency. Finally, in the reaction tank component 5, known chemical reaction methods are used to remove colloids, dissolved organic matter, heavy metals, nitrogen, phosphorus, and other pollutants from the polyaluminum chloride production wastewater, further purifying the water. The secondary sedimentation tank 6 separates sludge or flocculents from the effluent of the reaction tank 5, clarifying the water. Finally, the water undergoes deep filtration via membrane filtration in the fine filtration unit 7. During operation, wastewater from polyaluminum chloride production is fed into the bar screen pretreatment unit 2 for initial impurity removal, then sequentially passes through the grit chamber assembly 1, primary sedimentation tank 4, reaction tank 5, secondary sedimentation tank 6, and fine filtration unit 7. The final discharged water is clean and safe for discharge. When the wastewater is transported into the grit chamber 101, it enters through the inlet pipe 110. Because the inlet pipe 110 is spirally downwards, the water flows rapidly downwards in a spiral motion, and when it exits from the outlet at the bottom of the inlet pipe 110, it still retains its original characteristics. Due to inertia, the water continues to flow downwards in a spiral path, thus creating centrifugal force. Under this centrifugal force, the silt in the wastewater settles more easily towards the inner edge of the sedimentation tank 101, preventing excessive silt from settling in the middle. Under gravity, the silt in the wastewater settles, while the clear water in the upper part is easier to pump out. The multiple arc-shaped inclined surfaces of the sedimentation rack 109 increase the adhesion area of ​​the silt. When this process is complete and sand discharge is needed, the inside of the sedimentation tank 101 and the surface of the sedimentation rack 109 are rinsed with high-pressure water. The silt that has settled to the bottom of the sedimentation tank 101 is dispersed to the sedimentation outlet 103, where it is further discharged through multiple inverted conical sedimentation surfaces. The sand hopper 111 simultaneously forms a downward vortex, enabling the simultaneous discharge of settled silt from multiple areas. During sand discharge, the drive motor 805 is activated, driving the connected drive gear 803 to rotate. With the two drive gears 803 meshing, their simultaneous rotation drives the sand discharge spiral blades 802 inside the two sand discharge channels 801 to rotate simultaneously. Since the two sand discharge spiral blades 802 are symmetrically arranged, when they rotate simultaneously, they can transport and discharge the silt flowing downward through the sand hopper 111. By rotating the sand discharge spiral blades 802, each sealing plate 809 is rotated to fit tightly against the bottom of the corresponding sand hopper 111, thereby blocking the bottom of the sand hopper 111.To prevent sediment and wastewater from leaking out of the sedimentation hopper 111 during sedimentation, and to prevent excessive sediment buildup during use, the air pump 902 is activated to output high-pressure, high-speed airflow from the fixed pipe 903. This high-pressure airflow is then transported through the diversion pipe 904 to the connecting pipes 905 on both sides. Simultaneously, multiple one-way valves 907 are opened, and the high-pressure airflow is injected into each sedimentation hopper 111 through the air injection pipe 906. The pressure of the airflow forces the accumulated sediment out of the sedimentation hopper 111, loosening it and facilitating the discharge of sediment from the sedimentation tank 101. When the air pump 902 is turned off, the multiple one-way valves 907 close simultaneously to prevent sediment and wastewater from flowing back into the gas delivery pipes. The sediment concentration meter 107, vibrating motor 112, conveying pump 302, drive motor 805, and air pump 902 are all electrically connected to the control panel 105, which controls their start and stop. During wastewater sedimentation in the settling tank 101, the sediment concentration is detected by inserting the probe of the sediment concentration meter 107 into the detection area 108. When the sediment concentration is high, sediment discharge is required to prevent the sediment at the bottom of the tank from forming a slab. At this time, the control panel 105 automatically starts the drive motor 805 and air pump 902 to discharge and loosen the sediment. Simultaneously, the vibrating motor 112 is activated, and under the action of vibration, the sediment is assisted to enter the settling inlet 103 in a vortex. When the sediment concentration meter 107 detects a low concentration, the control panel 105 stops the sediment discharge drive equipment, providing the advantage of automated sediment discharge.

[0043] The wiring diagrams of the control panel 105, sediment concentration meter 107, vibration motor 112, delivery pump 302, drive motor 805, and air pump 902 in this invention are common knowledge in the field, and their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control methods and wiring layouts of the control panel 105, sediment concentration meter 107, vibration motor 112, delivery pump 302, drive motor 805, and air pump 902 will not be explained in detail.

[0044] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A kind of polyaluminium chloride production wastewater zero discharge treatment recycling system, including grid pretreatment mechanism (2), sand trap subassembly (1), primary sedimentation tank mechanism (4), reaction tank mechanism (5), secondary sedimentation tank mechanism (6) and fine filter mechanism (7), the bottom of the sand trap subassembly (1) is equipped with sand discharge subassembly (8) and gas injection subassembly (9), it is characterized in that: The sand trap subassembly (1) includes sand trap pool body (101), the inside bottom surface of the sand trap pool body (101) is equipped with multiple sand traps (103), the bottom of each sand trap (103) is fixedly connected with sand trap hopper (111), and sand trap hopper (111) is arranged in a manner that it is wide at the top and narrow at the bottom, the inside bottom surface of the sand trap pool body (101) is fixedly connected with sedimentation rack (109), and the sedimentation rack (109) is combined by multiple sedimentation plates, the top of the sedimentation rack (109) is narrow and the bottom is wide, which is conducive to the attachment of sand particles, the inner wall of the sand trap pool body (101) is fixedly connected with water inlet pipeline (110) near its top; The sand discharge subassembly (8) includes two sand discharge channels (801), the inner wall of each sand discharge channel (801) is rotatably connected with sand discharge spiral blade (802), the outer surfaces of two sand discharge spiral blades (802) are fixedly connected with multiple closure plates (809), each closure plate (809) is respectively position corresponding to each sand trap hopper (111), and the closure plate (809) is used to block the material in the sand trap hopper (111). The path of the water inlet pipeline (110) is spirally arranged, which is used to generate a rotating flow centrifugal force of the waste water injected into the sand pool body (101), the outer surface of the sand pool body (101) is fixedly connected with a mounting plate (104), the outer surface of the mounting plate (104) is provided with a control panel (105), one side of the sand pool body (101) is fixedly communicated with a detection area (108) near the bottom, the outer surface of the sand pool body (101) is fixedly connected with a reinforcing frame (106) near the detection area (108), the outer surface of the reinforcing frame (106) is provided with a silt concentration meter (107), the detection probe of the silt concentration meter (107) is inserted into the inside of the detection area (108), and the silt concentration meter (107) is used to detect the silt content in the sand pool body (101), the bottom of the sand pool body (101) is fixedly connected with a support frame (102) near the two sides, the bottom of the sand pool body (101) is provided with a vibration motor (112), and the vibration motor (112) is used to loosen the accumulated sand in the sand pool body (101), the outer surfaces of the two sand discharge channels (801) are fixedly connected with a gas injection assembly (9), the gas injection assembly (9) comprises a mounting frame (901), the inside of the mounting frame (901) is provided with a gas pump (902), the output end of the gas pump (902) is fixedly communicated with a fixed pipe (903), one end of the fixed pipe (903) is fixedly communicated with a shunt pipe (904), the two ends of the two shunt pipes (904) are fixedly communicated with a connecting pipe (905), the two ends of the two connecting pipes (905) are fixedly communicated with a gas injection pipe (906), one end of each gas injection pipe (906) is fixedly inserted into the inside of the corresponding sand hopper (111), and the outside of each gas injection pipe (906) is provided with a check valve (907).

2. The polyaluminum chloride production wastewater zero discharge treatment recycling system according to claim 1, characterized in that: The grid pretreatment mechanism (2), the sand pool assembly (1), the primary sedimentation tank mechanism (4), the reaction tank mechanism (5), the secondary sedimentation tank mechanism (6) and the fine filtration mechanism (7) are provided with a material conveying assembly (3), the material conveying assembly (3) comprises a conveying pump (302), the input end of the conveying pump (302) is fixedly communicated with an input pipe (301), and the output end of the conveying pump (302) is fixedly communicated with an output pipe (303).

3. The polyaluminum chloride production wastewater zero discharge treatment and recycling system according to claim 2, characterized in that: The grid pretreatment mechanism (2) is used for removing suspended matters, floating matters and impurities with large particle sizes in waste water, the sand pool assembly (1) is used for removing inorganic particles with large densities in waste water to reduce the inorganic suspended matter content of waste water, the primary sedimentation tank mechanism (4) is used for removing precipitable organic and inorganic suspended matters in waste water, the reaction tank mechanism (5) is used for removing colloids, soluble organic matters, heavy metals and nitrogen and phosphorus in waste water, the secondary sedimentation tank mechanism (6) is used for precipitating sludge generated by reaction to the bottom of the pool through gravity settling, and the fine filtration mechanism (7) is used for further removing fine suspended matters, colloids, microorganisms, part of organic matters and dissolved salts in waste water.

4. The polyaluminum chloride production wastewater zero discharge treatment and recycling system according to claim 3, characterized in that: A plurality of said sand trap (111) is divided into two groups, two groups of said sand trap (111) is fixedly connected at the top of two sand channel (801), two said sand spiral blade (802) one end is fixedly connected with positioning turntable (808), two said positioning turntable (808) outer surface is fixedly connected with sealing block (807), two said sand channel (801) one end is provided with rotating hole (806), two said sealing block (807) is respectively in the inner wall of two rotating hole (806) rotation.

5. The polyaluminum chloride production wastewater zero discharge treatment and recycling system according to claim 4, characterized in that: Two said sealing block (807) one side is fixedly connected with drive gear (803), two said drive gear (803) outer surface meshing connection, wherein one said sand channel (801) bottom is fixedly connected with fixed plate (804), the top of said fixed plate (804) is provided with drive motor (805), the output shaft of said drive motor (805) and one of said drive gear (803) outer surface center fixedly connected.

6. A treatment process of a polyaluminum chloride production wastewater zero discharge treatment recycling system, characterized in that, The polyaluminum chloride production wastewater zero discharge treatment recycling system of claim 5 is used, comprising the following steps: S1, the wastewater produced by polyaluminum chloride production is sequentially subjected to the grid pretreatment mechanism (2), the sand trap assembly (1), the primary sedimentation tank mechanism (4), the reaction tank mechanism (5), the secondary sedimentation tank mechanism (6), and the fine filtration mechanism (7). The wastewater enters the sand trap tank body (101) through the spiral downward water inlet pipeline (110). The inertia causes the water flow to continue to flow downward in a spiral path. The sand in the wastewater is deposited to the inner edge of the sand trap tank body (101). The sand is dispersed to the sand discharge port (103) through the multiple arc-shaped inclined surfaces of the sedimentation frame (109), thereby increasing the adhesion area of the sand. When the sand is discharged, the sand deposited at the bottom of the sand trap tank body (101) is dispersed to the sand discharge port (103) through the multiple inverted conical sand traps (111), and the deposited sand is discharged outward. S2, by starting the drive motor (805), the sand discharge spiral blade (802) inside the two sand channels (801) is simultaneously rotated, the sand flowing downward through the sand trap (111) is transported and discharged outward. By rotating the sand discharge spiral blade (802), each sealing plate (809) is turned to the bottom of the corresponding sand trap (111) to tightly adhere to the bottom of the sand trap (111). S3, by starting the air pump (902), and opening the multiple one-way valves (907), the high-pressure gas flow is injected into each sand trap (111) through the gas injection pipe (906). The pressure of the gas flow will flush out the accumulated sand in the sand trap (111), and the accumulated sand will be impacted and loosened. When the air pump (902) is closed, the multiple one-way valves (907) are simultaneously closed. S4, the detection of sediment concentration by inserting the detection probe of the sediment concentration meter (107) inside the detection area (108) is detected, when the sediment concentration is high, the sand discharge is needed, at this time, the control panel (105) automatically starts the driving motor (805) and the air pump (902), so as to carry out the sand discharge and the sand loosening, and starts the vibration motor (112) at the same time, under the action of vibration, the auxiliary sediment enters the vortex into the sediment inlet (103), when the sediment concentration meter (107) detects that the concentration is low, the control panel (105) controls the driving equipment of sand discharge to stop.

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