A multi-stage processing system for zero-emission feed wastewater

Abstract

The application discloses a zero-emission feed wastewater multistage treatment system and belongs to the technical field of wastewater treatment, which comprises an aeration tank, a plurality of shells are arranged on one side of the aeration tank, a water inlet pipe is communicated with the top of the shell, a water outlet pipe is communicated with one side of the bottom of the shell, an interceptor is arranged in the shell, a flow guide plate is arranged below the interceptor, a residue discharging mechanism is arranged on the outer wall of the shell away from the water outlet pipe, a separation mechanism is arranged in the water outlet pipe, a quantitative mechanism is arranged on one side of the shell, and the residue discharging mechanism is driven by the gravity of waste residue, the separation mechanism mechanically locks grease by using the density difference of the floating ball, and the quantitative mechanism resets and limits flow by relying on the potential energy of the spring.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a multi-stage treatment system for zero-discharge feed wastewater. Background Technology

[0002] Feed wastewater mainly originates from processes such as feed washing machines, equipment rinsing, workshop floor cleaning, and steam condensation. Its water quality has extremely complex industrial characteristics. Feed wastewater is not only rich in a large amount of waste feed particles, broken fibers, and other high-concentration suspended solids, but also contains a large amount of protein, oil, and high-viscosity colloidal substances. If such wastewater is discharged directly, it will cause catastrophic eutrophication pollution to the surrounding water ecosystem. Zero discharge technology has become the key guideline for wastewater treatment in modern feed mills. Zero discharge multi-stage treatment systems need to comprehensively adopt multi-stage processes such as physical pretreatment, chemical physicochemical separation, microbial aeration and biochemical degradation, and deep membrane concentration. Among them, the aeration and biochemical stage is the core of degrading organic matter.

[0003] Existing wastewater treatment systems typically use static screens to intercept feed debris in wastewater. This feed debris easily forms a dense filter cake on the screen surface, clogging the filtration channels. The large amounts of animal and vegetable oils carried in the wastewater from the feed washing machine exhibit high emulsification and dispersion characteristics. Existing wastewater treatment systems often have large grease traps that are prone to oil-water mixing due to level fluctuations. If a large amount of oil flows directly into the subsequent biological aeration tank with the wastewater, it will coat the surface of the activated sludge, causing microbial suffocation and death, ultimately leading to the collapse of the entire biological system. Feed mills frequently switch between production types and cleaning processes, resulting in irregular fluctuations in the proportion of pollutants in the wastewater. Existing wastewater treatment systems often use ordinary on / off valves, allowing large amounts of high-concentration wastewater to flow into the aeration reactor without obstruction, subjecting microorganisms to organic overload and severely reducing the treatment efficiency of the aeration tank, ultimately resulting in effluent quality failing to meet standards. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of easy clogging and jamming of filter screens in existing wastewater treatment systems, high-concentration oil and grease contamination of biochemical sludge in existing wastewater treatment systems, and overload of aeration tanks caused by large-flow wastewater impacts in existing wastewater treatment systems. Therefore, a zero-discharge multi-stage treatment system for feed wastewater is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A zero-discharge feed wastewater multi-stage treatment system includes an aeration tank, with multiple outer shells on one side of the aeration tank. The top of each outer shell is connected to an inlet pipe, and the bottom side of each outer shell is connected to an outlet pipe. An interceptor is installed inside the outer shell, and a guide plate is installed below the interceptor.

[0007] The slag discharge mechanism includes a guide block located on the outer wall of the shell on the side away from the outlet pipe, through which the slag intercepted in the interceptor is guided and discharged into the shell;

[0008] The separation mechanism includes a sealing plate inserted into the outlet pipe, and the opening and closing of the outlet pipe is controlled by the movement of the sealing plate to separate the water phase and the oil phase.

[0009] The metering mechanism includes a squeezing block located on one side of the outer shell. The movement of the squeezing block triggers the metering mechanism to control the amount of wastewater discharged into the aeration tank.

[0010] As a further description of the above technical solution:

[0011] The slag discharge mechanism also includes: a fixed shell, a fixed pipe, a guide pipe, and a trigger rod;

[0012] One end of the fixed shell is connected to the corresponding position inside the outer shell. The fixed tube is embedded inside the fixed shell. The bottom end of the guide tube is embedded in the outer wall of the fixed shell. The trigger rod is located inside the guide tube. The bottom end of the trigger rod passes through the corresponding position on the outer wall of the fixed tube.

[0013] As a further description of the above technical solution:

[0014] The slag discharge mechanism also includes: a movable column, a movable pipe, a limiting pipe, and a telescopic rod;

[0015] The movable column is located inside the fixed tube, with one end of the movable column abutting against the bottom end of the trigger rod. The movable tube is located inside the fixed shell, with one end of the movable tube abutting against one end of the fixed tube. The limiting tube is sleeved inside the fixed shell, with the inner wall of the limiting tube slidably connected to the outer wall of the movable tube. One end of the telescopic rod is connected to one end of the movable tube.

[0016] As a further description of the above technical solution:

[0017] The slag discharge mechanism also includes: a stroke groove, a limit block, a first spring, and a linkage rod;

[0018] The travel groove is formed on the outer wall of the moving tube, the top of the limiting block is embedded in the corresponding position on the inner wall of the limiting tube, the bottom of the limiting block is set in the travel groove, the first spring is set inside the moving tube, and the two ends of the first spring are respectively connected to one end of the moving column and one end of the telescopic rod at corresponding positions, the middle part of the linkage rod is rotatably connected to one side of the outer shell through the rod body, one end of the linkage rod is rotatably connected to the corresponding position on the outer wall of the guide block through the block body, and the other end of the linkage rod is rotatably connected to the other end of the telescopic rod through the block body.

[0019] As a further description of the above technical solution:

[0020] The separation mechanism further includes: a fixing frame, a limiting sleeve, and a central shaft;

[0021] The fixing frame is installed on the bottom of the outer wall of the outer shell near the water outlet pipe. The limiting sleeve is embedded in the top of the fixing frame. The central shaft is located inside the limiting sleeve. The outer wall of the central shaft is slidably connected to the inner wall of the limiting sleeve. The top of the sealing plate is connected to the bottom of the central shaft.

[0022] As a further description of the above technical solution:

[0023] The separation mechanism further includes: a rotating sleeve, a connecting column, and a linkage block;

[0024] The rotating sleeve is mounted outside the central shaft, and the central shaft is rotatably connected to the rotating sleeve via a column. One end of the connecting column passes through the inner wall of the outer shell near the water outlet pipe. The middle part of the linkage block is rotatably connected to the outer shell near the water outlet pipe via a rod. One end of the linkage block is rotatably connected to one side of the rotating sleeve, and the other end of the linkage block is rotatably connected to one end of the connecting column.

[0025] As a further description of the above technical solution:

[0026] The separation mechanism further includes: a movable frame, a guide groove, a guide column, a limiting rod, and a connecting rod;

[0027] The movable frame is installed inside the outer shell. Two guide grooves are symmetrically opened on the outer wall of the movable frame. Two guide columns are symmetrically arranged on both sides of one end of the connecting column. The guide columns are slidably connected in the guide grooves at the corresponding positions. The top end of the limiting rod is connected to the bottom of the guide plate. The bottom end of the limiting rod passes through the corresponding position of the movable frame. The top end of the connecting rod is connected to the bottom of the movable frame. A float is connected to the bottom end of the connecting rod.

[0028] As a further description of the above technical solution:

[0029] The quantitative mechanism further includes: a mounting frame, a positioning sleeve, and a positioning seat;

[0030] One side of the mounting bracket is connected to the outer wall of the outer casing near the water outlet pipe at the corresponding position. The positioning sleeve is embedded in the top of the mounting bracket, and the positioning seat is located on the top of the positioning sleeve.

[0031] As a further description of the above technical solution:

[0032] The metering mechanism further includes: a moving shaft, a second spring, and a clearance groove;

[0033] The movable shaft is located inside the positioning sleeve, the second spring is sleeved outside the movable shaft, and the two ends of the second spring are respectively connected to the corresponding positions of the outer wall of the movable shaft and the bottom of the positioning seat. The clearance groove is opened on the outer wall of the positioning sleeve.

[0034] As a further description of the above technical solution:

[0035] The metering mechanism also includes: an elastic plate, a compression groove, and a third spring;

[0036] The elastic plate is located inside the moving shaft, the extrusion groove is opened at the bottom of the elastic plate, the top of the extrusion block passes through the extrusion groove, the third spring is located inside the moving shaft, and the two ends of the third spring are respectively connected to the corresponding positions of the outer wall of the elastic plate and the top of the extrusion block.

[0037] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0038] 1. In this invention, by setting up a slag discharge mechanism, the gravitational torque of the accumulated waste slag is used to break the balance, so that the interceptor rotates while the trigger rod is pressed down to drive the guide block to rotate and open the slag discharge port. It is driven entirely by the gravity of the waste slag itself, realizing automatic slag discharge and automatic reset, preventing filter screen blockage, reducing maintenance frequency, and improving the ease of use of the device.

[0039] 2. In this invention, by setting up a separation mechanism, the float ball is kept in the critical layer of the water-oil interface by utilizing the density range between oil and water. The separation mechanism is triggered only when the water phase in the wastewater accumulates and the liquid level rises, pulling the sealing plate up to open the outlet pipe. Conversely, when the oil phase increases, the system remains mechanically locked, preventing high-concentration oil from entering the aeration tank and preventing high-concentration oil from encapsulating microorganisms, thus ensuring the wastewater treatment effect of the device.

[0040] 3. In this invention, by setting a quantitative mechanism, when the outlet pipe is opened to the predetermined maximum flow threshold, the elastic plate and the relief groove are misaligned and disengaged, and the accumulated spring potential energy is released instantly, pushing the sealing plate to quickly reset and block the outlet pipe, thereby realizing quantitative flow restriction for single discharge, effectively preventing overload of the aeration tank and ensuring the operational stability of the sewage treatment system. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the main structure of a zero-discharge multi-stage treatment system for feed wastewater proposed in this invention;

[0042] Figure 2 This is a schematic diagram showing the disassembled structure of a zero-discharge multi-stage treatment system for feed wastewater proposed in this invention;

[0043] Figure 3 This is a partial half-section diagram of a zero-discharge feed wastewater multi-stage treatment system proposed in this invention;

[0044] Figure 4 This is a schematic diagram of the slag discharge mechanism of a zero-discharge feed wastewater multi-stage treatment system proposed in this invention;

[0045] Figure 5This is a half-sectional schematic diagram of the slag discharge mechanism of a zero-discharge feed wastewater multi-stage treatment system proposed in this invention;

[0046] Figure 6 This is a partial cross-sectional view of the separation mechanism of a zero-discharge feed wastewater multi-stage treatment system proposed in this invention.

[0047] Figure 7 For the present invention Figure 6 A magnified structural diagram of part A in the middle;

[0048] Figure 8 This is a schematic diagram of the quantitative mechanism structure of a zero-discharge feed wastewater multi-stage treatment system proposed in this invention;

[0049] Figure 9 This is a half-sectional schematic diagram of the quantitative mechanism of a multi-stage zero-discharge feed wastewater treatment system proposed in this invention.

[0050] Legend: 1. Aeration tank; 2. Outer shell; 3. Inlet pipe; 4. Outlet pipe; 5. Interceptor; 6. Guide plate; 7. Sludge discharge mechanism; 701. Fixed shell; 702. Fixed pipe; 703. Guide pipe; 704. Trigger rod; 705. Moving column; 706. Limiting pipe; 707. Moving pipe; 708. Stroke groove; 709. Limiting block; 710. Telescopic rod; 711. First spring; 712. Linkage rod; 713. Guide block; 8. Separation mechanism; 801. Fixed frame; 802. Limiting sleeve; 803. Central shaft; 804. Sealing plate; 805. Rotating sleeve; 806. Linkage block; 807. Connecting column; 808. Guide column; 809. Moving frame; 810. Guide groove; 811. Limiting rod; 812. Connecting rod; 813. Float; 9. Quantitative mechanism; 901. Mounting frame; 902. Positioning sleeve; 903. Positioning seat; 904. Moving shaft; 905. Second spring; 906. Relief groove; 907. Elastic plate; 908. Extrusion groove; 909. Third spring; 910. Extrusion block. Detailed Implementation

[0051] 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.

[0052] Please see Figures 1-9The present invention provides a technical solution: a zero-discharge feed wastewater multi-stage treatment system, including an aeration tank 1, a plurality of outer shells 2 on one side of the aeration tank 1, an inlet pipe 3 connected to the top of the outer shell 2, an outlet pipe 4 connected to the bottom side of the outer shell 2, an interceptor 5 inside the outer shell 2, and a guide plate 6 below the interceptor 5.

[0053] The slag discharge mechanism 7 includes a guide block 713 located on the outer wall of the outer shell 2 away from the water outlet pipe 4. The guide block 713 guides and discharges the floating slag intercepted in the interceptor 5 into the interior of the outer shell 2.

[0054] The separation mechanism 8 includes a sealing plate 804 inserted into the water outlet pipe 4. The opening and closing of the water outlet pipe 4 is controlled by the movement of the sealing plate 804 to separate the water phase and the oil phase.

[0055] The metering mechanism 9 includes a squeezing block 910 located on one side of the outer casing 2. The movement of the squeezing block 910 triggers the metering mechanism 9 to control the amount of wastewater discharged into the aeration tank 1.

[0056] Please see Figures 4-5 The slag discharge mechanism 7 also includes: a fixed shell 701, a fixed pipe 702, and a guide pipe 703;

[0057] One end of the fixed shell 701 is connected to the corresponding position inside the outer shell 2. The fixed tube 702 is embedded inside the fixed shell 701. The bottom end of the guide tube 703 is embedded in the outer wall of the fixed shell 701. The trigger rod 704 is located inside the guide tube 703. The bottom end of the trigger rod 704 passes through the corresponding position on the outer wall of the fixed tube 702.

[0058] The slag discharge mechanism 7 also includes: a movable column 705, a movable pipe 707, a limiting pipe 706, and a telescopic rod 710;

[0059] The movable column 705 is located inside the fixed tube 702, and one end of the movable column 705 abuts against the bottom end of the trigger rod 704. The movable tube 707 is located inside the fixed shell 701, and one end of the movable tube 707 abuts against one end of the fixed tube 702. The limiting tube 706 is sleeved inside the fixed shell 701, and the inner wall of the limiting tube 706 is slidably connected to the outer wall of the movable tube 707. One end of the telescopic rod 710 is connected to one end of the movable tube 707.

[0060] The slag discharge mechanism 7 also includes: a stroke groove 708, a limit block 709, a first spring 711, and a linkage rod 712;

[0061] The travel groove 708 is formed on the outer wall of the moving tube 707. The top of the limiting block 709 is embedded in the corresponding position of the inner wall of the limiting tube 706, and the bottom of the limiting block 709 is set in the travel groove 708. The first spring 711 is set inside the moving tube 707, and the two ends of the first spring 711 are respectively connected to one end of the moving column 705 and one end of the telescopic rod 710 at corresponding positions. The middle part of the linkage rod 712 is rotatably connected to one side of the outer shell 2 through the rod body. One end of the linkage rod 712 is rotatably connected to the corresponding position of the outer wall of the guide block 713 through the block body, and the other end of the linkage rod 712 is rotatably connected to the other end of the telescopic rod 710 through the block body.

[0062] Specifically: The interceptor 5 has an inclined plate inside, and multiple interception holes are opened on the outer wall of the inclined plate. A counterweight is provided at the bottom of the interceptor 5 near the water outlet pipe 4, so that the interceptor 5 is biased towards the water outlet pipe 4 by default. Wastewater enters the outer shell 2 through the water inlet pipe 3. When the wastewater flows through the inclined plate of the interceptor 5, the interception holes filter the feed waste in the wastewater and intercept it on the side of the interceptor 5 away from the water outlet pipe 4, and it gradually accumulates. When the weight of the feed waste accumulated on the side of the interceptor 5 away from the water outlet pipe 4 exceeds the weight of the counterweight, the feed waste presses down on the interceptor 5, causing the interceptor 5 to rotate counterclockwise.

[0063] Furthermore, the bottom end of the trigger rod 704 is set as an inclined surface, and one end of the moving column 705 is also set as an inclined surface, with the inclined surfaces of the two abutting each other. When the interceptor 5 rotates counterclockwise, its bottom side away from the water outlet pipe 4 contacts the top end of the trigger rod 704 and presses down on the trigger rod 704. The trigger rod 704 pushes the moving column 705 through the inclined surface, causing the moving column 705 to move closer to the telescopic rod 710. The first spring 711 is compressed, and the moving column 705 pushes the telescopic rod 710 to move synchronously through the first spring 711. The moving tube 707 moves synchronously with the telescopic rod 710, and the moving tube 707 separates from the fixed tube 702. The limiting block 709 moves from one end of the stroke groove 708 near the telescopic rod 710 to the other end. The telescopic rod 710 extends relative to the fixed shell 701. The cross-sectional shape of the linkage rod 712 is L-shaped. One end of the telescopic rod 710 pushes the shorter end of the L-shaped linkage rod 712, causing the linkage rod 712 to rotate around the central hinge. The longer end of the L-shaped device pushes the guide block 713, causing it to rotate clockwise around its pivot point with respect to the outer shell 2. This brings one side of the guide block 713 into contact with the side of the interceptor 5 furthest from the outlet pipe 4. The feed waste slides out of the interceptor 5 and is discharged from the outer shell 2 along the guide block 713. The counterweight causes the interceptor 5 to rotate clockwise under its own weight. The interceptor 5 no longer presses down on the trigger rod 704, and the first spring 711 is released. The first spring 711 uses its own elasticity to reset the moving column 705 and the moving tube 707. The telescopic rod 710 retracts relative to the fixed shell 701. The telescopic rod 710 pulls the guide block 713 back through the linkage rod 712, sealing the outer shell 2.

[0064] Please see Figures 6-7The separation mechanism 8 also includes: a fixed frame 801, a limiting sleeve 802, and a central shaft 803;

[0065] The fixing frame 801 is located on the bottom of the outer wall of the outer shell 2 near the water outlet pipe 4. The limiting sleeve 802 is embedded in the top of the fixing frame 801. The central shaft 803 is located inside the limiting sleeve 802. The outer wall of the central shaft 803 is slidably connected to the inner wall of the limiting sleeve 802. The top of the sealing plate 804 is connected to the bottom of the central shaft 803.

[0066] The separation mechanism 8 also includes: a rotating sleeve 805, a connecting column 807, and a linkage block 806;

[0067] The rotating sleeve 805 is located outside the central shaft 803. The central shaft 803 is rotatably connected to the rotating sleeve 805 through a column. One end of the connecting column 807 passes through the inner wall of the outer shell 2 near the water outlet pipe 4. The middle part of the linkage block 806 is rotatably connected to the outer shell 2 near the water outlet pipe 4 through a rod. One end of the linkage block 806 is rotatably connected to one side of the rotating sleeve 805, and the other end of the linkage block 806 is rotatably connected to one end of the connecting column 807.

[0068] The separation mechanism 8 also includes: a movable frame 809, a guide groove 810, a guide column 808, a limiting rod 811, and a connecting rod 812;

[0069] The movable frame 809 is located inside the outer shell 2. Two guide grooves 810 are symmetrically opened on the outer wall of the movable frame 809. Two guide columns 808 are symmetrically arranged on both sides of one end of the connecting column 807. The guide columns 808 are slidably connected in the guide grooves 810 at the corresponding positions. The top end of the limiting rod 811 is connected to the bottom of the guide plate 6. The bottom end of the limiting rod 811 passes through the corresponding position of the movable frame 809. The top end of the connecting rod 812 is connected to the bottom of the movable frame 809. The bottom end of the connecting rod 812 is connected to a float 813.

[0070] Specifically: the wastewater from the filter of feed residue by the interceptor 5 flows along the direction of the interceptor 5 to the top of the guide plate 6. The guide plate 6 has an arc-shaped cross-section and guides the wastewater to the bottom of the inner shell 2. The wastewater contains a large amount of oil. The density of the float 813 is greater than that of oil but less than that of water, so the float 813 is located at the water-oil interface. When the water phase in the wastewater accumulates, the float 813 floats up. The float 813 drives the moving frame 809 to move upward along the limit rod 811 via the connecting rod 812. The guide column 808 moves from the top to the bottom of the guide groove 810. The guide column 808 drives the connecting column 807 to move into the inner shell 2. Pull one end of the linkage block 806 to make the linkage block 806 rotate counterclockwise around its central hinge. The other end of the linkage block 806 pulls the rotating sleeve 805, and the rotating sleeve 805 pulls the central shaft 803 to move upward along the axis of the limiting sleeve 802. When the central shaft 803 rises, it drives the sealing plate 804 to move synchronously. The sealing plate 804 gradually separates from the inside of the outlet pipe 4, opening the outlet pipe 4 to discharge the aqueous phase of the wastewater into the aeration tank 1. Conversely, when the oil phase increases but the aqueous phase does not increase, the float ball 813 will not float and the separation mechanism 8 cannot be opened, preventing wastewater with excessive oil content from entering the aeration tank 1 and encapsulating the microbial sludge, thus affecting the microbial reaction.

[0071] It should be noted that the float 813 mentioned above is made of polyethylene plastic, which is polymerized from ethylene monomers. It has excellent properties such as being non-toxic, resistant to low temperatures, and resistant to chemical corrosion. Its density ranges from 0.90 to 0.96 g / cm3, which is less than that of water (1.0 g / cm3) but greater than that of oil (0.8 to 0.93 g / cm3). This part is well-known technology in the field and will not be elaborated here.

[0072] Please see Figures 8-9 The quantitative mechanism 9 also includes: mounting bracket 901, positioning sleeve 902, and positioning seat 903;

[0073] One side of the mounting bracket 901 is connected to the corresponding position of the outer wall of the outer casing 2 near the water outlet pipe 4. The positioning sleeve 902 is embedded in the top of the mounting bracket 901, and the positioning seat 903 is located on the top of the positioning sleeve 902.

[0074] The metering mechanism 9 also includes: a moving shaft 904, a second spring 905, and a clearance groove 906;

[0075] The movable shaft 904 is located inside the positioning sleeve 902, the second spring 905 is sleeved on the outside of the movable shaft 904, and the two ends of the second spring 905 are respectively connected to the corresponding positions of the outer wall of the movable shaft 904 and the bottom of the positioning seat 903. The clearance groove 906 is opened on the outer wall of the positioning sleeve 902.

[0076] The metering mechanism 9 also includes: an elastic plate 907, an extrusion groove 908, and a third spring 909;

[0077] The elastic plate 907 is located inside the moving shaft 904, the extrusion groove 908 is opened at the bottom of the elastic plate 907, the top of the extrusion block 910 is inserted into the extrusion groove 908, and the third spring 909 is located inside the moving shaft 904, with the two ends of the third spring 909 connected to the corresponding positions of the outer wall of the elastic plate 907 and the top of the extrusion block 910, respectively.

[0078] Specifically: When the separation mechanism 8 is triggered and the central shaft 803 rises, the top of the central shaft 803 pushes the bottom of the moving shaft 904, causing the moving shaft 904 to rise relative to the positioning seat 903. The second spring 905 is compressed, and the squeezing block 910 rises synchronously with the central shaft 803. The third spring 909 is compressed, and the inclined surface of the squeezing block 910 abuts against the inner wall of the squeezing groove 908. The squeezing block 910 pushes the bottom of the elastic plate 907 towards the relief groove 906 through the inclined surface. The bottom of the elastic plate 907 is abutted by the bottom of the relief groove 906. At this time, the flow rate of the water outlet pipe 4 is the predetermined maximum flow rate threshold. When the float 813 continues to rise... As the central shaft 803 continues to rise, the top of the inner wall of the relief groove 906 abuts against the inclined surface of the elastic plate 907, and the inclined surface pushes the elastic plate 907 away from the relief groove 906. At the moment when the bottom of the elastic plate 907 is misaligned with the bottom of the inner wall of the relief groove 906, the second spring 905 and the third spring 909 are released simultaneously. The second spring 905 and the third spring 909 push the central shaft 803 downward through their own elastic potential energy, so that the central shaft 803 pushes the sealing plate 804 to quickly reset and seal the outlet pipe 4, preventing excessive wastewater from flowing into the aeration tank 1 at one time and exceeding the microbial treatment capacity for organic matter.

[0079] Working principle: During use, the staff uses the pipeline to introduce feed wastewater into the outer shell 2 through the inlet pipe 3. The feed wastewater flows through the interceptor 5 to filter out feed residue. When the feed residue accumulates to a certain amount, the slag discharge mechanism 7 is triggered to discharge the feed residue from the outer shell 2. The staff regularly cleans the discharged waste residue. The wastewater after slag removal is discharged quantitatively into the aeration tank 1 through the outlet pipe 4. The staff starts the air supply device to aerate the wastewater. After the wastewater aeration treatment is completed, the wastewater continues to undergo subsequent treatment processes until the wastewater meets the zero discharge standard.

[0080] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A zero-discharge multi-stage treatment system for feed wastewater, comprising an aeration tank (1), characterized in that, The aeration tank (1) is provided with multiple outer shells (2) on one side. The top of the outer shell (2) is connected to the water inlet pipe (3), and the bottom side of the outer shell (2) is connected to the water outlet pipe (4). An interceptor (5) is provided inside the outer shell (2), and a guide plate (6) is provided below the interceptor (5). The slag discharge mechanism (7) includes a guide block (713) located on the outer wall of the outer shell (2) away from the water outlet pipe (4), which guides and discharges the slag intercepted in the interceptor (5) into the interior of the outer shell (2); The separation mechanism (8) includes a sealing plate (804) inserted into the water outlet pipe (4), and the opening and closing of the water outlet pipe (4) is controlled by the movement of the sealing plate (804) to separate the water phase and the oil phase; The metering mechanism (9) includes a squeezing block (910) located on one side of the outer shell (2). The movement of the squeezing block (910) triggers the metering mechanism (9) to control the amount of sewage discharged into the aeration tank (1).

2. The zero-discharge multi-stage treatment system for feed wastewater according to claim 1, characterized in that, The slag discharge mechanism (7) also includes: A fixed shell (701) is provided, one end of which is connected to a corresponding position inside the outer shell (2); A fixing tube (702) is embedded inside a fixing shell (701); Guide tube (703), the bottom end of which is embedded in the outer wall of the fixed shell (701); The trigger rod (704) is located inside the guide tube (703), and the bottom end of the trigger rod (704) passes through the corresponding position on the outer wall of the fixed tube (702).

3. The zero-discharge multi-stage treatment system for feed wastewater according to claim 2, characterized in that, The slag discharge mechanism (7) also includes: A movable column (705) is located inside a fixed tube (702), and one end of the movable column (705) abuts against the bottom end of a trigger rod (704). A movable tube (707) is disposed inside a fixed shell (701), and one end of the movable tube (707) abuts against one end of a fixed tube (702); A limiting tube (706) is sleeved inside the fixed shell (701), and the inner wall of the limiting tube (706) is slidably connected to the outer wall of the moving tube (707). Telescopic rod (710), one end of which is connected to one end of movable tube (707).

4. The zero-discharge multi-stage treatment system for feed wastewater according to claim 3, characterized in that, The slag discharge mechanism (7) also includes: A travel groove (708) is formed on the outer wall of the moving tube (707); The limiting block (709) has its top embedded in the corresponding position of the inner wall of the limiting tube (706), and its bottom is located in the stroke groove (708). The first spring (711) is located inside the moving tube (707), and the two ends of the first spring (711) are respectively connected to one end of the moving column (705) and one end of the telescopic rod (710). Linkage rod (712), the middle part of the linkage rod (712) is rotatably connected to one side of the outer shell (2) through the rod body, one end of the linkage rod (712) is rotatably connected to the corresponding position of the outer wall of the guide block (713) through the block body, and the other end of the linkage rod (712) is rotatably connected to the other end of the telescopic rod (710) through the block body.

5. A zero-discharge multi-stage treatment system for feed wastewater according to claim 1, characterized in that, The separation mechanism (8) further includes: A fixing bracket (801) is provided on the bottom of the outer wall of the outer shell (2) near the water outlet pipe (4); A limiting sleeve (802) is embedded in the top of the frame of the fixing frame (801); A central shaft (803) is located inside a limiting sleeve (802). The outer wall of the central shaft (803) is slidably connected to the inner wall of the limiting sleeve (802). The top of the sealing plate (804) is connected to the bottom of the central shaft (803).

6. The zero-discharge multi-stage treatment system for feed wastewater according to claim 5, characterized in that, The separation mechanism (8) further includes: A rotating sleeve (805) is provided outside the central shaft (803), and the central shaft (803) is rotatably connected to the rotating sleeve (805) through a column. A connecting post (807) is provided at one end through the inner wall of the outer shell (2) near the water outlet pipe (4); Linkage block (806), the middle part of the linkage block (806) is rotatably connected to the side of the outer shell (2) near the water outlet pipe (4) via a rod body, one end of the linkage block (806) is rotatably connected to the side of the rotating sleeve (805), and the other end of the linkage block (806) is rotatably connected to one end of the connecting column (807).

7. A zero-discharge multi-stage treatment system for feed wastewater according to claim 6, characterized in that, The separation mechanism (8) further includes: A movable frame (809) is disposed inside the outer casing (2); Guide grooves (810), two guide grooves (810) are symmetrically opened on the outer wall of the movable frame (809); Guide posts (808), two guide posts (808) are symmetrically arranged on both sides of one end of the connecting post (807), and the guide posts (808) are slidably connected in the guide groove (810) at the corresponding position; Limiting rod (811), the top end of the limiting rod (811) is connected to the bottom of the guide plate (6), and the bottom end of the limiting rod (811) is inserted into the corresponding position of the frame of the movable frame (809); A connecting rod (812) is provided, the top end of which is connected to the bottom of the frame of the movable frame (809), and a float (813) is connected to the bottom end of the connecting rod (812).

8. A zero-discharge multi-stage treatment system for feed wastewater according to claim 1, characterized in that, The quantitative mechanism (9) further includes: Mounting bracket (901), one side of which is connected to the corresponding position of the outer wall of the outer shell (2) near the water outlet pipe (4); Positioning sleeve (902), the positioning sleeve (902) is embedded in the top of the mounting bracket (901); Positioning seat (903), which is located on the top of positioning sleeve (902).

9. A zero-discharge multi-stage treatment system for feed wastewater according to claim 8, characterized in that, The quantitative mechanism (9) further includes: A movable shaft (904) is disposed inside the positioning sleeve (902); The second spring (905) is sleeved on the outside of the moving shaft (904), and the two ends of the second spring (905) are respectively connected to the outer wall of the moving shaft (904) and the bottom of the positioning seat (903). A clearance groove (906) is formed on the outer wall of the positioning sleeve (902).

10. A zero-discharge multi-stage treatment system for feed wastewater according to claim 9, characterized in that, The quantitative mechanism (9) further includes: Elastic plate (907), said elastic plate (907) is disposed inside the moving shaft (904); The extrusion groove (908) is located at the bottom of the elastic plate (907), and the top of the extrusion block (910) passes through the extrusion groove (908). The third spring (909) is located inside the moving shaft (904), and the two ends of the third spring (909) are respectively connected to the outer wall of the elastic plate (907) and the top of the extrusion block (910).

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