Industrial sewage multi-stage treatment device and multi-stage sewage treatment process based on electric demulsification

Abstract

The present application relates to the technical field of sewage multi-stage treatment, and discloses a multi-stage industrial sewage treatment device and a multi-stage sewage treatment process based on electric demulsification. The present application can separate the scum, sediment and sewage in the industrial sewage through a primary sedimentation process in the primary treatment cavity, then input the sewage into the secondary treatment cavity, further mix the sewage in the mixing chamber to form emulsion, and then overflow the emulsion above the liquid outlet from the liquid outlet to the through treatment chamber, and exchange with the liquid in the electric demulsification chamber. In the electric demulsification chamber, the emulsion is broken under the action of the electric field to produce flocculation and stratification, and the emulsion flocculation stratification produces flocculation scum, flocculation supernatant and flocculation sediment. Then, the scum and sediment in the industrial sewage, and the flocculation scum and flocculation sediment are effectively removed, thereby ensuring the treatment effect of the industrial sewage.

Description

Technical Field

[0001] This invention relates to the field of multi-stage wastewater treatment technology, specifically to multi-stage industrial wastewater treatment equipment and a multi-stage wastewater treatment process based on electro-demulsification. Background Technology

[0002] Industrial wastewater treatment often employs a multi-stage approach. Primary wastewater treatment primarily targets suspended solids and floating matter, typically using physical and mechanical methods such as screens, grit chambers, and primary sedimentation tanks to achieve initial solid-liquid separation. Secondary and subsequent treatment processes focus on dissolved and colloidal organic matter, generally relying on biochemical processes such as activated sludge and biofilm methods to degrade pollutants through the metabolic activity of microorganisms.

[0003] Current multi-stage treatment processes typically design each treatment unit as an independent, spatially separated structure or equipment module. For example, primary sedimentation tanks, aeration tanks, secondary sedimentation tanks, flocculation sedimentation tanks, filters, and even reverse osmosis membrane modules are often dispersed across a large plant area according to the process flow sequence. This layout directly leads to a significant energy consumption for in-plant wastewater transfer during the wastewater treatment process. Booster pump stations need to be started multiple times to lift wastewater from the previous treatment unit to the next, or, to meet the requirements of gravity flow, certain elevation differences need to be established between structures, which itself increases civil engineering costs and energy consumption.

[0004] Among current wastewater treatment processes, multi-stage wastewater treatment based on electrodemulsification is a highly efficient and clean enhanced treatment technology developed specifically for oily wastewater, especially highly stable emulsion wastewater. Electrodemulsification technology applies a direct current or alternating current electric field, causing charged emulsion oil droplets to undergo electrophoretic migration and dipole orientation under the influence of the electric field. Under the influence of dielectric forces, they deform and oscillate, ultimately disrupting their double-layer structure. This causes the fine oil droplets to coalesce into larger droplets, accelerating their upward flotation and separation, thus achieving oil-water separation or solid-liquid separation.

[0005] Currently, industrial wastewater is typically characterized by large flow rates, high pollutant concentrations, and complex physical properties. Moving wastewater from one treatment unit to another requires a pumping system to overcome pipeline resistance and elevation differences, especially for complex industrial wastewater requiring long, multi-stage treatment processes. Frequent pumping not only consumes electrical energy but can also cause shear damage to the already formed flocs, affecting treatment efficiency. Furthermore, decentralized facilities require longer connecting pipelines, increasing head losses along the pipeline and raising investment and maintenance costs for the network. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a multi-stage industrial wastewater treatment device and a multi-stage wastewater treatment process based on electro-demulsification.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A multi-stage industrial wastewater treatment device includes a primary treatment chamber and a secondary treatment chamber, which are isolated from each other. The primary treatment chamber includes a pretreatment chamber, a sludge discharge chamber, and a wastewater transfer chamber, which are also isolated from each other. Both the sludge discharge chamber and the wastewater transfer chamber are located at the top of the pretreatment chamber. Industrial wastewater is input into the pretreatment chamber and naturally settles and stratifies, producing scum wastewater, middle layer wastewater, and sludge wastewater from top to bottom. The pretreatment chamber is also equipped with a laminar flow drive mechanism, which provides horizontal driving force to drive the scum in the industrial wastewater to the sludge discharge chamber due to its own buoyancy. The secondary treatment chamber moves within the chamber; the secondary treatment chamber includes a through treatment chamber, the top of which is respectively provided with a mixing chamber and an electro-demulsification chamber. The top of the mixing chamber has a drain port that communicates with the through treatment chamber, and the bottom of the electro-demulsification chamber is directly connected to the through treatment chamber. The middle layer wastewater is input into the mixing chamber through the wastewater transfer chamber. Under the action of the mixing unit inside the mixing chamber, an emulsion is formed. The emulsion that does not exceed the drain port overflows from the drain port into the through treatment chamber and is input into the electro-demulsification chamber through the communication of the through treatment chamber. It is then electrolyzed and demulsified and flocculated. The wastewater generated by the flocculation and stratification of the emulsion is discharged separately.

[0009] Preferably, the slag discharge chamber includes a slag discharge guiding chamber and a slag discharge guiding inclined plate. One end of the slag discharge guiding inclined plate is fixed to the top of the slag discharge guiding chamber, and the other end of the slag discharge guiding inclined plate is inclined downward. A slag discharge pipe is provided on one side of the slag discharge guiding chamber, and the bottom end of the slag discharge guiding chamber is inclined downward toward the side facing the slag discharge pipe.

[0010] Preferably, the laminar flow drive mechanism includes a middle layer drive unit and a top layer drive unit. Both the middle layer drive unit and the top layer drive unit include a plurality of drive impellers, each of which can provide a horizontal driving force away from its own direction. Each of the drive impellers of the middle layer drive unit is disposed below the side of the pretreatment chamber near the slag discharge chamber and the wastewater transfer chamber. Each of the drive impellers of the top layer drive unit is disposed at the top of the pretreatment chamber away from the slag discharge chamber and the wastewater transfer chamber.

[0011] Preferably, the wastewater transfer chamber includes an inlet chamber, a transfer chamber, and an isolation baffle. The isolation baffle separates the inlet chamber and the transfer chamber. The inlet chamber is connected to the middle layer of the pretreatment chamber via a middle-layer connecting pipe. A slag discharge trough is provided on the side of the inlet chamber near the slag discharge guiding chamber. The top of the inlet chamber and the top of the slag discharge guiding chamber are connected through the slag discharge trough, and the bottom height of the slag discharge trough is greater than the top height of the slag discharge guiding inclined plate.

[0012] Preferably, the isolation baffle has a transfer slot in the middle, and a slot control gate is provided on one side of the isolation baffle; the slot control gate includes a gate bracket and a movable gate plate, a drive rod is fixedly provided on one side of the movable gate plate, the drive rod passes through the gate bracket from bottom to top, a drive handwheel is threaded to the top of the drive rod, and the bottom end of the drive handwheel abuts against the gate bracket.

[0013] Preferably, the drive handwheel can drive the movable gate to move up and down during the movement of the movable gate, and control the opening degree of the transfer trough from bottom to top during the movement of the movable gate; the middle layer sewage input into the liquid inlet chamber through the middle layer connecting pipe can further stratify, and the scum sewage can enter the scum discharge guide chamber from the scum discharge trough; by controlling the opening degree of the transfer trough from bottom to top, the scum sewage can be prevented from passing through the transfer trough and entering the transfer chamber.

[0014] Preferably, a transfer pipe is provided at one end of the transfer chamber away from the inlet chamber, and the other end of the transfer pipe extends into the bottom of the mixing chamber; the mixing unit includes a mixing motor, a mixing guide rod, and a mixing impeller, the mixing impeller extends into the interior of the mixing chamber and into one side of the bottom of the transfer pipe; the output end of the mixing motor outputs rotation to the mixing impeller through the mixing guide rod, and the rotation of the mixing impeller can drive the middle layer of wastewater inside the mixing chamber to form an emulsion.

[0015] Preferably, the electro-demulsification chamber and the mixing chamber are isolated by a through baffle, and the end of the through baffle extending out of the mixing chamber has a plurality of through slots; the through-processing chamber and the electro-demulsification chamber can be connected through each of the through slots and the open bottom end of the electro-demulsification chamber; an insulating support is mounted on the top of the electro-demulsification chamber, and a plurality of demulsification electrodes are installed inside the insulating support, with the polarity of two adjacent demulsification electrodes being opposite.

[0016] Preferably, a top drain pipe is provided at the top of the side of the electro-demulsification chamber away from the mixing chamber, and a bottom drain port is provided at the bottom of the through-processing chamber. The emulsion overflowing from the drain port of the mixing chamber enters the through-processing chamber. The emulsion enters between the demulsification electrodes of the electro-demulsification chamber through liquid exchange between each through-channel and the open bottom of the electro-demulsification chamber, and flocculates and separates under the electric field generated by the demulsification electrodes. The flocculated scum and top clear liquid generated by flocculation and separation are discharged from the top drain pipe. The flocculated clear liquid generated by flocculation and separation remains inside the electro-demulsification chamber to continue to act as a flocculation medium. The flocculated sediment and bottom clear liquid generated by flocculation and separation are discharged from the bottom drain port.

[0017] A multi-stage wastewater treatment process based on electro-demulsification, using the aforementioned multi-stage industrial wastewater treatment equipment, includes the following steps:

[0018] Industrial wastewater is continuously fed into the pretreatment chamber. Under the influence of gravity, the wastewater in the pretreatment chamber naturally settles and stratifies, producing scum wastewater, middle layer wastewater and sludge wastewater from top to bottom. The sludge wastewater is discharged from the bottom of the pretreatment chamber.

[0019] Driven by the laminar flow drive mechanism, the scum in the industrial wastewater moves into the scum discharge chamber due to its own buoyancy. The scum in the industrial wastewater is then discharged after being enriched in the scum discharge chamber.

[0020] The intermediate layer wastewater is fed into the mixing chamber through the wastewater transfer chamber. Inside the mixing chamber, the intermediate layer wastewater is further mixed to form an emulsion. The emulsion that does not exceed the drain outlet overflows from the drain outlet into the through-processing chamber.

[0021] The emulsion enters the electro-demulsification chamber through the through-processing chamber. Inside the electro-demulsification chamber, the emulsion undergoes flocculation and stratification under the action of an electric field, producing flocculated scum, flocculated clear liquid, and flocculated sediment.

[0022] Flocculated scum accumulates at the top of the electro-demulsification chamber and is discharged from the top of the electro-demulsification chamber. Flocculated clear liquid remains inside the electro-demulsification chamber. Flocculated sediment accumulates at the bottom of the through-processing chamber and is discharged from the bottom of the through-processing chamber.

[0023] Compared with existing technologies, this invention provides a multi-stage industrial wastewater treatment device and a multi-stage wastewater treatment process based on electro-demulsification, which has the following beneficial effects:

[0024] 1. This multi-stage industrial wastewater treatment equipment separates scum and sediment from the wastewater through a primary sedimentation process in the primary treatment chamber. The scum and sediment are then discharged separately. The wastewater is then fed into the secondary treatment chamber, where it is further mixed in the mixing chamber to form an emulsion. The emulsion, with the top portion above the drain outlet, overflows into the through-treatment chamber and exchanges with the liquid inside the electro-demulsification chamber. Inside the electro-demulsification chamber, the emulsion demulsifies under the influence of an electric field, resulting in flocculation and stratification. This flocculation produces flocculated scum, flocculated clear liquid, and flocculated sediment. By discharging the flocculated scum and flocculated sediment separately, the stratified pollutants in the emulsion can be effectively separated. This effectively removes the scum and sediment, as well as the flocculated scum and flocculated sediment from the industrial wastewater, ensuring the treatment effect of the industrial wastewater.

[0025] 2. In this type of multi-stage industrial wastewater treatment equipment, within the pretreatment chamber, scum and sediment in the industrial wastewater spontaneously accumulate at the top and bottom of the chamber due to their own density. Through the arrangement of the impellers in the middle and top driving units of the laminar flow drive mechanism, the scum that floats to the surface in the pretreatment chamber due to buoyancy can first move to the end away from the scum discharge chamber, preventing it from accumulating at the bottom of the scum discharge chamber and wastewater transfer chamber, thus hindering its continued upward movement. Then, it moves from the end away from the scum discharge chamber to the end closer to it, driving the scum to move through the scum discharge guide plate into the scum discharge guide chamber. The scum discharge guide plate is inclined downwards at the end away from the guide chamber, and the bottom of the scum discharge guide chamber is also inclined downwards towards the scum discharge pipe, preventing the scum from flowing back and ensuring that it is fully discharged from the scum discharge pipe, thereby effectively separating and discharging the scum from the wastewater.

[0026] 3. In this type of multi-stage industrial wastewater treatment equipment, the intermediate layer wastewater in the pretreatment chamber enters the inlet chamber through the intermediate layer connecting pipe. Sludge and scum can be further separated from the wastewater inside the inlet chamber, allowing the scum wastewater to enter the sludge discharge guiding chamber from the sludge discharge trough. Since the bottom height of the sludge discharge trough is greater than the top height of the sludge discharge guiding inclined plate, the fluid in the sludge discharge guiding chamber can be prevented from flowing back into the inlet chamber, and the sludge can continue to remain inside the inlet chamber. In actual use, the movable gate can be moved up and down by rotating the drive handwheel. During the movement of the movable gate, the opening of the transfer trough from bottom to top can be controlled, thereby limiting the liquid surface range of the intermediate layer wastewater passing through the transfer trough and ensuring that only the intermediate layer wastewater can pass through the transfer trough and enter the transfer chamber.

[0027] 4. In this type of multi-stage industrial wastewater treatment equipment, the intermediate layer wastewater is input through a transfer pipe to the vicinity of the mixing impeller at the bottom of the mixing chamber. The output of the mixing motor outputs rotation to the mixing impeller through the mixing transmission rod. The rotation of the mixing impeller drives the intermediate layer wastewater inside the mixing chamber to form an emulsion. The emulsion that does not exceed the drain outlet overflows from the drain outlet into the through-processing chamber, thus avoiding a sharp change in the pollutant concentration of the input intermediate layer wastewater, which would affect the stability of flocculation and stratification in the through-processing chamber. Under the electric field generated by the demulsification electrode, the emulsion flocculates and stratifies, effectively separating and removing flocculated scum and flocculated sediment from the industrial wastewater. Attached Figure Description

[0028] Figure 1 This is one of the three-dimensional structural schematic diagrams of a multi-stage industrial wastewater treatment device according to the present invention;

[0029] Figure 2 This is a second three-dimensional structural schematic diagram of a multi-stage industrial wastewater treatment device according to the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of the pretreatment chamber of a multi-stage industrial wastewater treatment device according to the present invention;

[0031] Figure 4 This is one of the three-dimensional structural schematic diagrams of the primary treatment chamber of a multi-stage industrial wastewater treatment device according to the present invention;

[0032] Figure 5 This is a second three-dimensional structural schematic diagram of the primary treatment chamber of a multi-stage industrial wastewater treatment device according to the present invention;

[0033] Figure 6 This is one of the three-dimensional structural schematic diagrams of the secondary treatment chamber of a multi-stage industrial wastewater treatment device according to the present invention;

[0034] Figure 7 This is a second three-dimensional structural schematic diagram of the secondary treatment chamber of a multi-stage industrial wastewater treatment device according to the present invention;

[0035] Figure 8 This is one of the schematic diagrams of the internal structure of the secondary treatment chamber of a multi-stage industrial wastewater treatment device according to the present invention;

[0036] Figure 9 This is a second schematic diagram of the internal structure of the secondary treatment chamber of a multi-stage industrial wastewater treatment device according to the present invention.

[0037] In the diagram: 1. Pretreatment chamber; 2. Sludge discharge chamber; 21. Sludge discharge guide chamber; 22. Sludge discharge guide ramp; 23. Sludge discharge pipe; 3. Wastewater transfer chamber; 31. Liquid inlet chamber; 311. Sludge discharge trough; 32. Transfer chamber; 33. Isolation baffle; 331. Transfer trough; 34. Intermediate layer connecting pipe; 35. Trench control gate; 351. Gate bracket; 352. Movable gate; 353. Drive lever; 354. Drive handwheel; 6. Transfer pipe; 4. Laminar flow drive mechanism; 41. Middle layer drive unit; 42. Top layer drive unit; 5. Through-processing chamber; 51. Through-baffle; 52. Through-groove opening; 53. Bottom layer drain outlet; 6. Mixing chamber; 61. Drain outlet; 62. Mixing unit; 621. Mixing motor; 622. Mixing transmission rod; 623. Mixing impeller; 7. Electro-demulsification chamber; 71. Insulating support; 72. Demulsification electrode; 73. Top layer drain pipe. Detailed Implementation

[0038] 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.

[0039] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a multi-stage industrial wastewater treatment device and a multi-stage wastewater treatment process based on electro-demulsification.

[0040] Example 1:

[0041] Please see Figures 1-9A multi-stage industrial wastewater treatment device includes a primary treatment chamber and a secondary treatment chamber, which are isolated from each other. The primary treatment chamber includes a pretreatment chamber 1, a sludge discharge chamber 2, and a wastewater transfer chamber 3, which are also isolated from each other. Both the sludge discharge chamber 2 and the wastewater transfer chamber 3 are located at the top of the pretreatment chamber 1. Industrial wastewater is input into the pretreatment chamber 1 and naturally settles and stratifies, producing scum wastewater, middle layer wastewater, and sludge wastewater from top to bottom. The pretreatment chamber 1 is also equipped with a laminar flow drive mechanism 4, which provides horizontal driving force to drive the scum in the industrial wastewater to the sludge discharge chamber due to its own buoyancy. The secondary treatment chamber includes a through treatment chamber 5, with a mixing chamber 6 and an electro-demulsification chamber 7 respectively located at the top of the through treatment chamber 5. The top of the mixing chamber 6 has a drain port 61 that communicates with the through treatment chamber 5, and the bottom of the electro-demulsification chamber 7 is directly connected to the through treatment chamber 5. The middle layer of wastewater is input into the mixing chamber 6 through the wastewater transfer chamber 3. Under the action of the mixing unit 62 inside the mixing chamber 6, an emulsion is formed. The emulsion that does not exceed the drain port 61 overflows from the drain port 61 into the through treatment chamber 5, and is input into the electro-demulsification chamber 7 through the communication of the through treatment chamber 5. It is electrolyzed and demulsified and flocculated. The wastewater generated by the flocculation and stratification of the emulsion is discharged separately.

[0042] In practical use, industrial wastewater is fed into the pretreatment chamber 1 (specifically, the surface of the industrial wastewater in the pretreatment chamber 1 should ideally completely cover the slag discharge guide plate 22). Under the action of gravity, the wastewater in the pretreatment chamber 1 naturally settles and stratifies, generating scum wastewater, middle layer wastewater, and sediment wastewater from top to bottom (scum and sediment settle naturally due to their different densities and accumulate in the top and bottom layers of the pretreatment chamber 1, respectively). The increasing amount of wastewater in the pretreatment chamber 1 has a flow direction. First, driven by the laminar flow drive mechanism 4, the scum in the industrial wastewater moves into the slag discharge chamber 2 due to its own buoyancy. After the scum in the industrial wastewater accumulates in the slag discharge chamber 2, the top layer wastewater is discharged. Second, the middle layer wastewater is input into the mixing chamber 6 through the wastewater transfer chamber 3. After a period of industrial wastewater treatment, the sediment wastewater is discharged from the bottom of the pretreatment chamber 1 to complete the primary wastewater treatment process inside the pretreatment chamber 1 (primary treatment chamber).

[0043] Inside the secondary treatment chamber, the intermediate-layer wastewater input into the mixing chamber 6 is further mixed by the mixing unit 62 to form an emulsion. The emulsion, which overflows from the drain port 61, enters the through-processing chamber 5. The emulsion then enters the electro-demulsification chamber 7 (due to the continuous electro-demulsification within the electro-demulsification chamber 7, the concentration of pollutants in the treated wastewater decreases, causing the pollutants in the through-processing chamber 5 to spontaneously diffuse into the electro-demulsification chamber 7). Inside chamber 7, the emulsion breaks down under the action of an electric field, resulting in flocculation and stratification. The flocculation and stratification of the emulsion produces flocculated scum, flocculated clear liquid, and flocculated sediment. Among them, the flocculated scum continuously accumulates at the top of the electro-demulsification chamber 7 and is discharged from the top of the electro-demulsification chamber 7 along with the clear liquid at the top. The flocculated clear liquid remains inside the electro-demulsification chamber 7 and continues to act as a flocculation medium. The flocculated sediment accumulates at the bottom of the through-processing chamber 5 and is discharged from the bottom of the through-processing chamber 5 along with the clear liquid at the bottom.

[0044] The primary sedimentation process inside the primary treatment chamber separates the scum and sediment from the wastewater, and discharges the scum and sediment separately. The wastewater is then fed into the secondary treatment chamber, where it is further mixed in the mixing chamber 6 to form an emulsion. The emulsion, extending above the drain outlet 61, overflows into the through-treatment chamber 5 and exchanges liquid with the liquid inside the electro-demulsification chamber 7. (Due to the continuous electro-demulsification in the electro-demulsification chamber 7, the concentration of pollutants in the treated wastewater decreases.) The small size allows pollutants in the through-processing chamber 5 to spontaneously diffuse into the electro-demulsification chamber 7. Inside the electro-demulsification chamber 7, the emulsion is demulsified under the action of the electric field, resulting in flocculation and stratification. The flocculation and stratification of the emulsion produce flocculated scum, flocculated clear liquid, and flocculated sediment. By discharging the flocculated scum and flocculated sediment separately, the stratified pollutants (flocculated scum and flocculated sediment) in the emulsion can be effectively separated. This effectively removes the scum and sediment, as well as the flocculated scum and flocculated sediment from the industrial wastewater, thereby ensuring the treatment effect of the industrial wastewater.

[0045] Example 2:

[0046] Please see Figures 1-9 The difference from the above embodiment is that the slag discharge chamber 2 includes a slag discharge guide chamber 21 and a slag discharge guide inclined plate 22. One end of the slag discharge guide inclined plate 22 is fixed to the top of the slag discharge guide chamber 21, and the other end of the slag discharge guide inclined plate 22 is inclined downward. A slag discharge pipe 23 is provided on one side of the slag discharge guide chamber 21, and the bottom end of the slag discharge guide chamber 21 is inclined downward towards the side of the slag discharge pipe 23.

[0047] The laminar flow drive mechanism 4 includes a middle layer drive unit 41 and a top layer drive unit 42. Both the middle layer drive unit 41 and the top layer drive unit 42 include several drive impellers, each of which can provide a horizontal driving force away from its own direction. Each drive impeller of the middle layer drive unit 41 is located below the side of the pretreatment chamber 1 near the slag discharge chamber 2 and the sewage transfer chamber 3. Each drive impeller of the top layer drive unit 42 is located at the top of the pretreatment chamber 1 away from the slag discharge chamber 2 and the sewage transfer chamber 3.

[0048] In practical use, inside the pretreatment chamber 1, the scum and sediment in the industrial wastewater spontaneously accumulate towards the top and bottom of the pretreatment chamber 1 due to their own density. Through the arrangement of the drive impellers in the middle layer drive unit 41 and the top layer drive unit 42 of the laminar flow drive mechanism 4, a laminar flow is generated in the middle layer of the pretreatment chamber 1, flowing downwards from the side near the scum discharge chamber 2 and the wastewater transfer chamber 3, away from them. Meanwhile, a laminar flow is generated in the top layer of the pretreatment chamber 1, flowing towards the scum discharge chamber 2. This allows the scum that floats to the surface due to buoyancy inside the pretreatment chamber 1 to move away from the discharge chamber 2 and the wastewater transfer chamber 3. At one end of the slag chamber 2, to prevent the slag from accumulating at the bottom of the slag discharge chamber 2 and the sewage transfer chamber 3, thus affecting the continued floating of the slag, the slag moves from the end away from the slag discharge chamber 2 to the end closer to the slag discharge chamber 2. This drives the slag to move into the slag discharge guide chamber 21 through the slag discharge guide inclined plate 22. The slag discharge guide inclined plate 22 is inclined downward at the end away from the guide chamber 21, and the bottom of the slag discharge guide chamber 21 is inclined downward on the side facing the slag discharge pipe 23. This prevents the slag from moving back and flowing back, ensuring that the slag can be fully discharged from the slag discharge pipe 23, thereby effectively separating and discharging the slag in the sewage.

[0049] Example 3:

[0050] Please see Figures 1-9 The difference from the above embodiment is that the sewage transfer chamber 3 includes an inlet chamber 31, a transfer chamber 32 and an isolation baffle 33. The isolation baffle 33 separates the inlet chamber 31 and the transfer chamber 32. The inlet chamber 31 is connected to the middle layer inside the pretreatment chamber 1 through the middle layer connecting pipe 34. A slag discharge trough 311 is provided on the side of the inlet chamber 31 near the slag discharge guiding chamber 21. The top of the inlet chamber 31 and the top of the slag discharge guiding chamber 21 are connected through the slag discharge trough 311, and the bottom height of the slag discharge trough 311 is greater than the top height of the slag discharge guiding inclined plate 22.

[0051] The isolation baffle 33 has a transfer slot 331 in the middle, and a slot control gate 35 is provided on one side of the isolation baffle 33. The slot control gate 35 includes a gate bracket 351 and a movable gate plate 352. A drive rod 353 is fixedly provided on one side of the movable gate plate 352. The drive rod 353 passes through the gate bracket 351 from bottom to top. A drive handwheel 354 is threadedly connected to the top of the drive rod 353. The bottom end of the drive handwheel 354 abuts against the gate bracket 351.

[0052] The drive handwheel 354 can drive the movable gate 352 to move up and down during the movement of the movable gate 352. During the movement of the movable gate 352, the opening degree of the transfer trough 331 from bottom to top can be controlled. The middle layer sewage input into the liquid inlet chamber 31 through the middle layer connecting pipe 34 can be further stratified, and the scum sewage can enter the scum discharge guide chamber 21 from the scum discharge trough 311. By controlling the opening degree of the transfer trough 331 from bottom to top, the scum sewage can be prevented from passing through the transfer trough 331 and entering the transfer chamber 32.

[0053] The intermediate wastewater inside the pretreatment chamber 1 enters the inlet chamber 31 through the intermediate connecting pipe 34 (a liquid pump to supplement the liquid movement power is also installed outside the intermediate connecting pipe 34). The intermediate wastewater gradually submerges the inlet chamber 31. Since there may be incompletely separated sediment and scum in the intermediate wastewater drawn through the intermediate connecting pipe 34, the sediment and scum can be further separated from the wastewater inside the inlet chamber 31. This allows the scum wastewater to enter the scum discharge guiding chamber 21 from the scum discharge trough 311. Furthermore, since the bottom height of the scum discharge trough 311 is greater than the top height of the scum discharge guiding inclined plate 22, the backflow of fluid in the scum discharge guiding chamber 21 into the inlet is prevented. In chamber 31, sediment can remain inside the inlet chamber 31 (and be removed from the inlet chamber 31 when it accumulates to a height not exceeding the bottom of the transfer trough 331). In actual use, the movable gate 352 can be moved up and down by rotating the drive handwheel 354. During the movement of the movable gate 352, the opening of the transfer trough 331 from bottom to top can be controlled, thereby limiting the liquid surface range of the intermediate layer of sewage passing through the transfer trough 331. This ensures that only the intermediate layer of sewage can pass through the transfer trough 331 into the transfer chamber 32, and finally be input into the bottom of the mixing chamber 6 through the transfer pipe 36 for further processing.

[0054] Example 4:

[0055] Please see Figures 1-9The difference from the above embodiment is that a transfer pipe 36 is provided at one end of the transfer chamber 32 away from the liquid inlet chamber 31, and the other end of the transfer pipe 36 extends into the bottom of the mixing chamber 6; the mixing unit 62 includes a mixing motor 621, a mixing guide rod 622 and a mixing impeller 623, the mixing impeller 623 extends into the mixing chamber 6 and extends into one side of the bottom end of the transfer pipe 36; the output end of the mixing motor 621 outputs rotation to the mixing impeller 623 through the mixing guide rod 622, and the rotation of the mixing impeller 623 can drive the middle layer of sewage in the mixing chamber 6 to form an emulsion.

[0056] The electro-demulsification chamber 7 and the mixing chamber 6 are separated by a through baffle 51. The through baffle 51 has several through slots 52 at one end extending out of the mixing chamber 6. The through processing chamber 5 and the electro-demulsification chamber 7 can be connected through the through slots 52 and the open bottom end of the electro-demulsification chamber 7. An insulating support 71 is mounted on the top of the electro-demulsification chamber 7. Several demulsification electrodes 72 are installed inside the insulating support 71. The polarity of two adjacent demulsification electrodes 72 is opposite.

[0057] A top drain pipe 73 is provided at the top of the side of the electro-demulsification chamber 7 away from the mixing chamber 6, and a bottom drain port 53 is provided at the bottom of the through-processing chamber 5. The emulsion overflowing from the drain port 61 of the mixing chamber 6 enters the through-processing chamber 5. The emulsion enters between the demulsification electrodes 72 of the electro-demulsification chamber 7 through liquid exchange between each through-channel 52 and the open bottom of the electro-demulsification chamber 7, and flocculates and separates under the electric field generated by the demulsification electrodes 72. The flocculated scum and top clear liquid generated by flocculation and separation are discharged from the top drain pipe 73. The flocculated clear liquid generated by flocculation and separation remains inside the electro-demulsification chamber 7 to continue to act as a flocculation medium. The flocculated sediment and bottom clear liquid generated by flocculation and separation are discharged from the bottom drain port 53.

[0058] In practical use, the intermediate layer wastewater is input through transfer pipe 36 to the vicinity of the mixing impeller 623 at the bottom of the mixing chamber 6. The output of the mixing motor 621 outputs rotation to the mixing impeller 623 through the mixing transmission rod 622. The rotation of the mixing impeller 623 drives the intermediate layer wastewater inside the mixing chamber 6 to form an emulsion. The emulsion that does not exceed the drain port 61 overflows from the drain port 61 into the through-processing chamber 5. This ensures that only the emulsion that does not exceed the drain port 61 enters the through-processing chamber 5, avoiding a sharp change in the pollutant concentration of the input intermediate layer wastewater, which would affect the stability of flocculation and stratification in the through-processing chamber 5. The emulsion overflowing from the drain port 61 undergoes liquid exchange through the various through-channels 52 and the open bottom of the electro-demulsification chamber 7, and enters between the various demulsification electrodes 72 of the electro-demulsification chamber 7 (by... The concentration of pollutants in the treated wastewater decreases due to continuous electro-demulsification inside the electro-demulsification chamber 7, causing the pollutants in the through-processing chamber 5 to spontaneously diffuse into the electro-demulsification chamber 7. Then, under the electric field generated by the demulsification electrode 72 (in specific use, the demulsification electrode 72 can be a plate electrode, a columnar electrode, or other electrodes), flocculation and stratification occur. The flocculated scum continuously accumulates at the top of the electro-demulsification chamber 7 and is discharged from the top drain pipe 73 at the top of the electro-demulsification chamber 7 along with the top clear liquid of the electro-demulsification chamber 7. The flocculated clear liquid remains inside the electro-demulsification chamber 7 and continues to act as a flocculation medium. The flocculated sediment accumulates at the bottom of the through-processing chamber 5 and is discharged from the bottom drain port 53 at the bottom of the through-processing chamber 5 along with the bottom clear liquid of the electro-demulsification chamber 7. This effectively removes the flocculated scum and flocculated sediment from the industrial wastewater.

[0059] Example 5:

[0060] A multi-stage wastewater treatment process based on electro-demulsification, using an industrial wastewater multi-stage treatment device as described in any one of Examples 1-4, includes the following steps:

[0061] Industrial wastewater is continuously fed into the pretreatment chamber 1. Under the action of gravity, the wastewater in the pretreatment chamber 1 naturally settles and stratifies, generating scum wastewater, middle layer wastewater and sludge wastewater from top to bottom. The sludge wastewater is discharged from the bottom of the pretreatment chamber 1.

[0062] Driven by the laminar flow drive mechanism 4, the scum in the industrial wastewater moves into the scum discharge chamber 2 due to its own buoyancy. The scum in the industrial wastewater is then discharged after being enriched in the scum discharge chamber 2.

[0063] The intermediate layer wastewater is fed into the mixing chamber 6 through the wastewater transfer chamber 3. Inside the mixing chamber 6, the intermediate layer wastewater is further mixed to form an emulsion. The emulsion that does not reach the drain outlet 61 overflows from the drain outlet 61 into the through-processing chamber 5.

[0064] The emulsion enters the electro-demulsification chamber 7 through the through-processing chamber 5. Inside the electro-demulsification chamber 7, the emulsion is demulsified under the action of the electric field, resulting in flocculation and stratification. The flocculation and stratification of the emulsion produces flocculated scum, flocculated clear liquid and flocculated sediment.

[0065] The flocculated scum accumulates at the top of the electro-demulsification chamber 7 and is discharged from the top of the electro-demulsification chamber 7. The flocculated clear liquid remains inside the electro-demulsification chamber 7. The flocculated sediment accumulates at the bottom of the through-processing chamber 5 and is discharged from the bottom of the through-processing chamber 5.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage industrial wastewater treatment device, comprising a primary treatment chamber and a secondary treatment chamber, wherein the primary treatment chamber and the secondary treatment chamber are isolated from each other, characterized in that: The primary treatment chamber includes a pretreatment chamber (1), a sludge discharge chamber (2), and a wastewater transfer chamber (3). The sludge discharge chamber (2) and the wastewater transfer chamber (3) are isolated from each other. Both the sludge discharge chamber (2) and the wastewater transfer chamber (3) are located at the top inside the pretreatment chamber (1). Industrial wastewater is fed into the pretreatment chamber (1) and naturally settles and stratifies, producing scum wastewater, middle layer wastewater and sludge wastewater from top to bottom; The pretreatment chamber (1) is also equipped with a laminar flow drive mechanism (4), which can provide a horizontal driving force to drive the scum in the industrial wastewater to move into the scum discharge chamber (2) by combining its own buoyancy. The secondary processing chamber includes a through processing chamber (5), and a mixing chamber (6) and an electro-demulsification chamber (7) are respectively provided at the top of the through processing chamber (5). The top of the mixing chamber (6) is provided with a drain port (61) that communicates with the through processing chamber (5), and the bottom of the electro-demulsification chamber (7) is directly connected to the through processing chamber (5). The intermediate layer of wastewater is fed into the mixing chamber (6) through the wastewater transfer chamber (3). Under the action of the mixing unit (62) inside the mixing chamber (6), an emulsion is formed. The emulsion that has not reached the drain port (61) overflows from the drain port (61) into the through-processing chamber (5). It is fed into the electro-demulsification chamber (7) through the connection of the through-processing chamber (5) and is electrolyzed and demulsified and flocculated. The wastewater generated by the flocculation and stratification of the emulsion is discharged separately. The laminar flow drive mechanism (4) includes a middle layer drive unit (41) and a top layer drive unit (42). Both the middle layer drive unit (41) and the top layer drive unit (42) include several drive impellers, and each drive impeller can provide a horizontal driving force away from its own direction. Each of the drive impellers of the middle layer drive unit (41) is disposed below the pretreatment chamber (1) on the side near the slag discharge chamber (2) and the sewage transfer chamber (3); Each of the driving impellers of the top-level drive unit (42) is located on the side of the top of the pretreatment chamber (1) away from the slag discharge chamber (2) and the sewage transfer chamber (3).

2. The multi-stage industrial wastewater treatment equipment according to claim 1, characterized in that: The slag discharge chamber (2) includes a slag discharge guide chamber (21) and a slag discharge guide inclined plate (22). One end of the slag discharge guide inclined plate (22) is fixed to the top of the slag discharge guide chamber (21), and the other end of the slag discharge guide inclined plate (22) is inclined downward. A slag discharge pipe (23) is provided on one side of the slag discharge guiding chamber (21), and the bottom end of the slag discharge guiding chamber (21) is inclined downward toward the slag discharge pipe (23).

3. The multi-stage industrial wastewater treatment equipment according to claim 2, characterized in that: The wastewater transfer chamber (3) includes an inlet chamber (31), a transfer chamber (32), and an isolation baffle (33). The isolation baffle (33) separates the inlet chamber (31) and the transfer chamber (32). The inlet chamber (31) is connected to the middle layer of the pretreatment chamber (1) through a middle layer connecting pipe (34). The liquid inlet chamber (31) has a slag discharge slot (311) on the side near the slag discharge guide chamber (21). The top of the liquid inlet chamber (31) and the top of the slag discharge guide chamber (21) are connected through the slag discharge slot (311), and the bottom height of the slag discharge slot (311) is greater than the top height of the slag discharge guide inclined plate (22).

4. The multi-stage industrial wastewater treatment equipment according to claim 3, characterized in that: The isolation baffle (33) has a transfer slot (331) in the middle and a slot control gate (35) is provided on one side of the isolation baffle (33). The slot control gate (35) includes a gate bracket (351) and a movable gate plate (352). A drive rod (353) is fixedly installed on one side of the movable gate plate (352). The drive rod (353) passes through the gate bracket (351) from bottom to top. A drive handwheel (354) is threaded to the top of the drive rod (353). The bottom of the drive handwheel (354) abuts against the gate bracket (351).

5. The multi-stage industrial wastewater treatment equipment according to claim 4, characterized in that: The drive handwheel (354) can drive the movable gate (352) to move up and down during the movement of the movable gate (352), and control the opening degree of the transfer slot (331) from bottom to top during the movement of the movable gate (352). The intermediate layer sewage input into the liquid inlet chamber (31) through the intermediate layer connecting pipe (34) can be further stratified, and the scum sewage can enter the scum discharge guide chamber (21) from the scum discharge trough (311). By controlling the opening degree of the transfer trough (331) from bottom to top, it is possible to prevent scum and sewage from passing through the transfer trough (331) and entering the transfer chamber (32).

6. The multi-stage industrial wastewater treatment equipment according to claim 3, characterized in that: The transfer chamber (32) is provided with a transfer pipe (36) at one end away from the liquid inlet chamber (31), and the other end of the transfer pipe (36) extends into the bottom of the mixing chamber (6). The mixing unit (62) includes a mixing motor (621), a mixing transmission rod (622), and a mixing impeller (623). The mixing impeller (623) extends into the mixing chamber (6) and extends to the bottom side of the transfer pipe (36). The output end of the mixing motor (621) outputs rotation to the mixing impeller (623) through the mixing transmission rod (622). The rotation of the mixing impeller (623) can drive the middle layer of sewage inside the mixing chamber (6) to form an emulsion.

7. The multi-stage industrial wastewater treatment equipment according to claim 1, characterized in that: The electro-demulsification chamber (7) and the mixing chamber (6) are separated by a through baffle (51), and the through baffle (51) has a plurality of through slots (52) at one end extending out of the mixing chamber (6). The through-processing chamber (5) and the electro-demulsification chamber (7) can be connected through each of the through slots (52) and the open bottom of the electro-demulsification chamber (7); An insulating support (71) is mounted on the top of the electro-demulsification chamber (7). Several demulsification electrodes (72) are installed inside the insulating support (71). The polarity of two adjacent demulsification electrodes (72) is opposite.

8. The multi-stage industrial wastewater treatment equipment according to claim 7, characterized in that: The top end of the electro-demulsification chamber (7) away from the mixing chamber (6) is provided with a top drain pipe (73), and the bottom end of the through-processing chamber (5) is provided with a bottom drain port (53). The emulsion overflowing from the drain port (61) of the mixing chamber (6) enters the through-processing chamber (5). The emulsion enters between the demulsifying electrodes (72) of the electro-demulsifying chamber (7) through liquid exchange between each of the through-slots (52) and the open bottom of the electro-demulsifying chamber (7), and flocculates and stratifies under the electric field generated by the demulsifying electrodes (72). The flocculated scum and top clear liquid generated by flocculation stratification are discharged from the top drain pipe (73). The flocculated clear liquid generated by flocculation stratification remains inside the electro-demulsification chamber (7) to continue to act as a flocculation medium. The flocculated sediment and bottom clear liquid generated by flocculation stratification are discharged from the bottom drain port (53).

9. A multi-stage wastewater treatment process based on electro-demulsification, characterized in that, The multi-stage industrial wastewater treatment equipment as described in any one of claims 1-8 includes the following steps: Industrial wastewater is continuously fed into the pretreatment chamber (1). Under the action of gravity, the wastewater in the pretreatment chamber (1) settles and stratifies naturally, producing scum wastewater, middle layer wastewater and sludge wastewater from top to bottom. The sludge wastewater is discharged from the bottom of the pretreatment chamber (1). Driven by the laminar flow drive mechanism (4), the scum in the industrial wastewater moves into the scum discharge chamber (2) by combining its own buoyancy. The scum in the industrial wastewater is enriched in the scum discharge chamber (2) and then discharged. The intermediate layer sewage is fed into the mixing chamber (6) through the sewage transfer chamber (3). Inside the mixing chamber (6), the intermediate layer sewage is further mixed to form an emulsion. The emulsion that does not reach the drain port (61) overflows from the drain port (61) into the through treatment chamber (5). The emulsion enters the electro-demulsification chamber (7) through the through-processing chamber (5). Inside the electro-demulsification chamber (7), the emulsion undergoes flocculation and stratification under the action of the electric field. The flocculation and stratification of the emulsion produces flocculated scum, flocculated clear liquid and flocculated sediment. The flocculated scum accumulates at the top of the electro-demulsification chamber (7) and is discharged from the top of the electro-demulsification chamber (7). The flocculated clear liquid remains inside the electro-demulsification chamber (7). The flocculated sediment accumulates at the bottom of the through-processing chamber (5) and is discharged from the bottom of the through-processing chamber (5).

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