Industrial sewage multistage purification device and purification process thereof

Abstract

The application discloses an industrial wastewater multistage purification device and a purification process thereof, and relates to the technical field of industrial wastewater treatment, aiming to solve the problem that the existing purification device adopts a single treatment mode, and the removal effect on refractory organic matter and heavy metal ions is limited, and the overall structure is mostly designed in a decentralized manner, and each treatment unit is independent of each other, and the technical scheme is characterized by comprising a purification tank, a partition plate, a water inlet pipe, a membrane separation assembly, a first booster pump, a second booster pump and a filter assembly, the partition plate is fixedly installed in the interior of the purification tank, the water inlet ends of the first booster pump and the second booster pump are respectively and communicatively arranged with a sedimentation chamber and an oxidation chamber, a first water delivery pipe is installed between the first booster pump and the filter assembly, an aeration assembly is fixedly installed at the bottom of the oxidation chamber, and an ozone generator is fixedly installed below the purification tank, so that efficient purification, standard discharge and resource utilization of industrial wastewater are realized.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, specifically to a multi-stage industrial wastewater purification device and its purification process. Background Technology

[0002] With the rapid development of my country's industrial sector and the continuous expansion of industrial production scale, the discharge of industrial wastewater has also been rising steadily, becoming one of the main sources of water pollution. Industrial wastewater contains a large number of complex pollutants, including suspended solids, dissolved organic matter, heavy metal ions, ammonia nitrogen, phosphorus, and oily substances. The water quality of industrial wastewater varies greatly among different industries, with high pollutant concentrations, complex compositions, and difficulty in degradation. If directly discharged into natural water bodies, it will seriously disrupt the ecological balance of water bodies, affect groundwater quality, and threaten human health and ecological environment safety.

[0003] A search revealed that prior art, publication number CN103787552B, discloses a zero-discharge treatment system and method for high-COD industrial wastewater. The system includes: a reclaimed water equalization tank, an aerated biological filter, a lime clarification tank, a variable porosity filter, an ultrafiltration unit, a multi-stage reverse osmosis unit, a concentrate reverse osmosis unit, a concentration desalination unit, a multi-effect evaporation system, and a solids recovery unit, all connected sequentially by pipelines. The aerated biological filter, variable porosity filter, and ultrafiltration unit are all equipped with backwashing devices, which are all connected to the reclaimed water equalization tank. This invention can reduce the number of chemical cleanings required for ultrafiltration and reverse osmosis units, ensure the service life of membrane elements, reduce costs associated with replacing elements, and achieve zero discharge of high-COD industrial wastewater.

[0004] A search revealed that in the prior art, CN117902758A discloses an intelligent industrial wastewater treatment device and method. A heavy metal ion concentration detector in the mixing chamber transmits information about the heavy metal content in the physically filtered industrial wastewater to a control device. The control device then controls the ratio of flocculant and oxidant and adds them to the mixing chamber via an automatic dosing device. The sedimentation chamber precipitates the uniformly mixed wastewater and automatically discharges bottom sludge. The precipitated industrial wastewater is then transported to a reverse osmosis unit for permeation filtration to remove salts. Finally, antibiotics are removed under the electrocatalytic action of an electrocatalytic oxidation unit. An antibiotic detector and a flow meter detect the antibiotic content and flow rate in the purified water after treatment by the electrocatalytic oxidation unit, respectively. The control device precisely controls the current density and voltage intensity between the cathode and anode conductive needles based on feedback information to achieve optimal treatment efficiency. The entire process is intelligent, reducing manual operation.

[0005] Existing purification equipment mostly adopts a single treatment method, which has limited effect on removing recalcitrant organic matter and heavy metal ions. The overall structure is mostly a decentralized design, with each treatment unit being independent and requiring separate arrangement, resulting in a long process flow and making it difficult to meet the needs of stable discharge and resource utilization of complex industrial wastewater. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-stage industrial wastewater purification device and its purification process.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage industrial wastewater purification device, comprising a purification tank, a partition, an inlet pipe, a membrane separation component, a first booster pump, a second booster pump, and a filter component. The partition is fixedly installed inside the purification tank, and the purification tank is divided into a sedimentation chamber, an oxidation chamber, and a water storage chamber by the partition. The first and second booster pumps are fixedly installed on one side of the purification tank, and the inlet ends of the first and second booster pumps are respectively connected to the sedimentation chamber and the oxidation chamber. A first water supply pipe is installed between the first booster pump and the filter component, and the filter component is connected to the oxidation chamber through the first water supply pipe. A second water supply pipe is installed between the second booster pump and the membrane separation component. An aeration component is fixedly installed at the bottom of the oxidation chamber. An ozone generator is fixedly installed below the purification tank, and a connecting pipe is installed between the ozone generator and the aeration component. A PLC controller is fixedly installed at the front end of the purification tank, and the first booster pump, the second booster pump, and the ozone generator are electrically connected to the PLC controller.

[0008] Preferably, the water inlet pipe is fixedly installed above one end of the purification box, and the water outlet of the water inlet pipe extends into the interior of the sedimentation chamber. A filter bucket is fixedly installed on the top of the sedimentation chamber, and the filter bucket is installed below the water inlet pipe.

[0009] Preferably, the sedimentation chamber is equipped with a stirring mechanism, which includes a horizontal plate, a stirring motor and a stirring paddle. The horizontal plate is fixedly installed horizontally on the top of the purification box, the stirring motor is fixedly installed above the horizontal plate, the upper end of the stirring paddle is connected to the output end of the stirring motor, and the stirring motor is electrically connected to the PLC controller.

[0010] Preferably, the filtration assembly includes a tank, a quartz sand layer, an activated carbon layer, and a fine filter screen layer. The quartz sand layer, activated carbon layer, and fine filter screen layer are installed horizontally and parallel to each other from top to bottom inside the tank. Both the membrane separation assembly and the filtration assembly are equipped with backwashing mechanisms.

[0011] Preferably, a temperature sensor is fixedly installed on the inner wall of the oxidation chamber, and a heating strip is vertically fixedly installed at each of the four corners of the oxidation chamber, and the temperature sensor and the heating strip are electrically connected to the PLC controller.

[0012] Preferably, a first water quality analyzer and a second water quality analyzer are fixedly installed on one side of the purification tank, and the first water quality analyzer and the second water quality analyzer are respectively connected to the sedimentation chamber and the water storage chamber. The first water quality analyzer includes a pH sensor, a COD concentration sensor, a turbidity sensor and a suspended solids content sensor. The second water quality analyzer includes a pH sensor, a COD concentration sensor, a turbidity sensor and a conductivity sensor. A drain valve is fixedly installed on one side of the bottom of the purification tank, and the drain valve is connected to the water storage chamber. The first water quality analyzer and the second water quality analyzer are electrically connected to the PLC controller.

[0013] Preferably, a drain valve is fixedly installed on one side of the bottom of the purification tank, and one end of the drain valve is connected to the sedimentation chamber. The bottom of the sedimentation chamber is inclined towards the drain valve. A sludge collection tank is installed below one side of the purification tank. A filter cylinder is rotatably installed inside the sludge collection tank. The other end of the drain valve passes through the sludge collection tank and extends into the interior of the filter cylinder. A servo motor is fixedly installed above the sludge collection tank. A connecting shaft is fixedly installed inside the filter cylinder, and the upper end of the connecting shaft is connected to the output end of the servo motor. The servo motor is electrically connected to the PLC controller.

[0014] Preferably, a third booster pump is fixedly installed on one side of the sludge collection tank, and the inlet end of the third booster pump is connected to the bottom of the sludge collection tank. A return water pipe is installed at the outlet end of the third booster pump and is connected to the sedimentation chamber. The third booster pump is electrically connected to the PLC controller.

[0015] A multi-stage industrial wastewater purification device includes the following purification process: Step 1: Industrial wastewater enters the sedimentation chamber through the inlet pipe. The first water quality tester detects the pH value, COD concentration, turbidity, and suspended solids content of the wastewater. The PLC controller provides a water quality adjustment plan based on the test data, adding acid and alkali adjusters to the sedimentation chamber to adjust the pH value of the wastewater to 7.0-8.5. Step 2: Add coagulant and coagulant aid to the sedimentation chamber and mix them with the wastewater. At the same time, turn on the stirring motor to drive the stirring paddle to rotate. The rotating stirring paddle agitates the water in the sedimentation chamber, causing the suspended solids and colloidal substances in the wastewater to form dense flocs. The flocs settle to the bottom under the action of gravity. Step 3: Turn on the first booster pump to extract the supernatant in the sedimentation chamber and send it through the first water supply pipe into the filter assembly for multi-stage filtration. The wastewater after multi-stage filtration enters the oxidation chamber. Step 4: Start the ozone generator to produce ozone, which is sent into the aeration component through the connecting pipe. The ozone is released into the wastewater through the aeration holes on the aeration component. At the same time, hydrogen peroxide and titanium-based catalyst are added to the oxidation chamber for catalytic oxidation and degradation. Step 5: The temperature sensor detects the temperature of the wastewater in the oxidation chamber. When the temperature is low, the heating bar is activated to heat the wastewater in the oxidation chamber. The catalytic oxidation temperature is controlled at 25-35℃. Step Six: Start the second booster pump to send the wastewater after catalytic oxidation treatment into the membrane separation unit through the second water supply pipe. The membrane separation unit performs deep purification of the wastewater. The purified water enters the water storage chamber. The second water quality analyzer detects the water quality indicators of the purified water. Open the drain valve to discharge the obtained purified water. Step 7: After purification is complete, open the drain valve to let the flocs at the bottom of the sedimentation chamber flow into the high-speed rotating filter cylinder. The high-speed rotating filter cylinder generates centrifugal force, which throws out the water from the flocs for dehydration.

[0016] In summary, the beneficial technical effects of the present invention are as follows: 1. It adopts a sedimentation chamber, oxidation chamber, water storage chamber, membrane separation component and filtration component. The sedimentation chamber is used to regulate and coagulate the wastewater. The filtration component is used to perform multi-stage filtration of the wastewater. The oxidation chamber is used to perform catalytic oxidation and degradation of the wastewater. The membrane separation component is used to perform deep treatment of the wastewater. The water storage chamber stores the purified water for reuse. It integrates coagulation sedimentation, multi-stage filtration, catalytic oxidation and degradation, membrane separation deep treatment and water reuse into one unit. It can effectively remove suspended solids, organic matter, heavy metal ions, color, odor and other pollutants from industrial wastewater. The units work together to treat the wastewater, which is convenient for industrial site layout and installation. 2. Temperature sensors and heating bars are used. The temperature sensors measure the temperature of the wastewater in the oxidation chamber, and the PLC controller controls the heating bars according to the monitored temperature data. The heating bars are evenly distributed in the four corners of the oxidation chamber to heat the wastewater in the oxidation chamber from all directions. The heating bars ensure that the wastewater reaction temperature in the oxidation chamber is at the optimal reaction temperature, improve the efficiency of the catalytic oxidation reaction, and avoid incomplete reaction or excessive energy consumption caused by temperature fluctuations. 3. A first water quality analyzer and a second water quality analyzer were adopted. The first water quality analyzer detects the pH value, COD concentration, turbidity and suspended solids content of the wastewater in the sedimentation chamber, which facilitates the precise addition of chemical reagents to react with the wastewater and adjust homogenization. The second water quality analyzer detects the water quality data of the clear water in the storage chamber to determine whether it meets the requirements for industrial production reuse and improves the wastewater purification effect. 4. A drain valve and a sludge collection tank are adopted. The drain valve discharges the flocs in the sedimentation chamber into the filter cartridge for solid-liquid separation. The servo motor drives the connecting shaft to rotate, and the rotating connecting shaft drives the filter cartridge to rotate at high speed, generating centrifugal force. Under the action of centrifugal force, the flocs are thrown against the inner wall of the filter cartridge for concentration and dewatering treatment, which accelerates the floc dewatering process and realizes sludge reduction and disposal. The third booster pump extracts the dewatered wastewater and injects it back into the sedimentation chamber through the return water pipe for purification treatment. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the purification chamber of the present invention; Figure 3 This is the present invention. Figure 1 A magnified view of a portion of area A; Figure 4 This is a structural diagram of the pumping mechanism of the present invention; Figure 5 This is a structural diagram of the stirring mechanism of the present invention; Figure 6 This is a structural diagram of the filter component of the present invention; Figure 7 This is a diagram showing the connection between the filter cartridge and the sludge collection tank of this invention.

[0018] In the diagram: 1. Purification tank; 2. PLC controller; 3. Baffle plate; 4. Inlet pipe; 5. Agitator; 501. Horizontal plate; 502. Agitator motor; 503. Agitator paddle; 6. Temperature sensor; 7. Membrane separation assembly; 8. First water quality analyzer; 9. First booster pump; 10. Second booster pump; 11. Ozone generator; 12. Connecting pipe; 13. Second water quality analyzer; 14. Drain valve; 15. Sewage valve; 16. Sludge. 17. Collection tank; 18. Third booster pump; 19. Return water pipe; 20. Filter bucket; 21. Aeration assembly; 22. Heating bar; 23. Sedimentation chamber; 24. Oxidation chamber; 25. Water storage chamber; 26. Filter assembly; 2501. Tank body; 2502. Quartz sand layer; 2503. Activated carbon layer; 2504. Fine filter screen layer; 27. First water supply pipe; 28. Second water supply pipe; 29. ​​Filter cylinder; 30. Servo motor; 31. Connecting shaft. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] 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.

[0021] Please see Figure 1-7This invention provides a technical solution: a multi-stage industrial wastewater purification device, comprising a purification tank 1, a partition 3, an inlet pipe 4, a membrane separation assembly 7, a first booster pump 9, a second booster pump 10, and a filter assembly 25. The partition 3 is fixedly installed inside the purification tank 1, and the purification tank 1 is divided into a sedimentation chamber 22, an oxidation chamber 23, and a water storage chamber 24 by the partition 3. The first booster pump 9 and the second booster pump 10 are fixedly installed on one side of the purification tank 1, and the inlet ends of the first booster pump 9 and the second booster pump 10 are respectively connected to the sedimentation chamber 22 and the oxidation chamber 23. A first water supply pipe 26 is installed between the first booster pump 9 and the filter assembly 25, and the filter assembly 25 is connected to the oxidation chamber 23 by the first water supply pipe 26. The system is connected in a 6-way configuration. A second water supply pipe 27 is installed between the second booster pump 10 and the membrane separation component 7. An aeration component 20 is fixedly installed at the bottom of the oxidation chamber 23. An ozone generator 11 is fixedly installed below the purification box 1, and a connecting pipe 12 is installed between the ozone generator 11 and the aeration component 20. A PLC controller 2 is fixedly installed at the front end of the purification box 1, and the first booster pump 9, the second booster pump 10, and the ozone generator 11 are electrically connected to the PLC controller 2. An inlet pipe 4 is fixedly installed above one end of the purification box 1, and the outlet end of the inlet pipe 4 extends into the interior of the sedimentation chamber 22. A filter bucket 19 is fixedly installed at the top of the sedimentation chamber 22, and the filter bucket 19 is installed below the inlet pipe 4.

[0022] Please see Figure 1 and Figure 5 The sedimentation chamber 22 is equipped with a stirring mechanism 5. The stirring mechanism 5 includes a horizontal plate 501, a stirring motor 502 and a stirring paddle 503. The horizontal plate 501 is horizontally fixed on the top of the purification box 1. The stirring motor 502 is fixedly installed above the horizontal plate 501. The upper end of the stirring paddle 503 is connected to the output end of the stirring motor 502. The stirring motor 502 is electrically connected to the PLC controller 2.

[0023] The stirring motor 502 drives the stirring paddle 503 to rotate. The lower end of the stirring paddle 503 extends into the sedimentation chamber 22. The rotating stirring paddle 503 can effectively agitate the sewage, so that the suspended particles and the added chemical agents can be fully mixed and reacted, thereby improving the sedimentation effect.

[0024] Please see Figure 4 and Figure 6 The filter assembly 25 includes a tank 2501, a quartz sand layer 2502, an activated carbon layer 2503, and a fine filter screen layer 2504. The quartz sand layer 2502, the activated carbon layer 2503, and the fine filter screen layer 2504 are installed horizontally and parallel to each other from top to bottom inside the tank 2501. Both the membrane separation assembly 7 and the filter assembly 25 are equipped with backwashing mechanisms.

[0025] The quartz sand layer 2502 removes larger suspended solids and colloids from the wastewater, reducing turbidity to below 5 NTU. The activated carbon layer 2503 adsorbs residual organic matter, color, and odor from the wastewater. The fine filter layer 2504 traps fine impurities and suspended solids in the wastewater. When the pressure difference between the membrane separation component 7 and the filter component 25 exceeds the set value, the backwashing mechanism is automatically activated to ensure the filtration effect of the membrane separation component 7 and the filter component 25.

[0026] Please see Figure 1 and Figure 2 A temperature sensor 6 is fixedly installed on the inner wall of the oxidation chamber 23. A heating strip 21 is vertically fixed at each of the four corners of the oxidation chamber 23. The temperature sensor 6 and the heating strip 21 are electrically connected to the PLC controller 2.

[0027] Temperature sensor 6 measures the temperature of wastewater in oxidation chamber 23. PLC controller 2 automatically adjusts the working state of heating strip 21 based on the monitored temperature data. Heating strip 21 is evenly distributed in the four corners of oxidation chamber 23, which can achieve all-round heating of wastewater, ensure that the internal temperature of oxidation chamber 23 is at the optimal reaction temperature, improve the efficiency of catalytic oxidation reaction, and avoid incomplete reaction or excessive energy consumption caused by temperature fluctuations.

[0028] Please see Figure 1 A first water quality detector 8 and a second water quality detector 13 are fixedly installed on one side of the purification tank 1. The first water quality detector 8 and the second water quality detector 13 are respectively connected to the sedimentation chamber 22 and the water storage chamber 24. The first water quality detector 8 includes a pH sensor, a COD concentration sensor, a turbidity sensor and a suspended solids content sensor. The second water quality detector 13 includes a pH sensor, a COD concentration sensor, a turbidity sensor and a conductivity sensor. A drain valve 14 is fixedly installed on one side of the bottom of the purification tank 1. The drain valve 14 is connected to the water storage chamber 24. The first water quality detector 8 and the second water quality detector 13 are electrically connected to the PLC controller 2.

[0029] The first water quality analyzer 8 detects the pH value, COD concentration, turbidity and suspended solids content of the wastewater in the sedimentation chamber 22, which facilitates the precise addition of chemical reagents to react with the wastewater. The second water quality analyzer 13 detects the water quality data of the clear water in the water storage chamber 24 to determine whether it meets the requirements for industrial production reuse. The drain valve 14 is then opened to discharge the clear water in the water storage chamber 24.

[0030] Please see Figure 1 and Figure 7A drain valve 15 is fixedly installed on one side of the bottom of the purification tank 1, and one end of the drain valve 15 is connected to the sedimentation chamber 22. The bottom of the sedimentation chamber 22 is inclined towards the drain valve 15. A sludge collection tank 16 is installed on the lower side of one side of the purification tank 1. A filter cartridge 28 is rotatably installed inside the sludge collection tank 16, and the other end of the drain valve 15 passes through the sludge collection tank 16 and extends into the interior of the filter cartridge 28. A servo motor 29 is fixedly installed on the top of the sludge collection tank 16. The filter cartridge 28... A connecting shaft 30 is fixedly installed inside the sludge collection tank 16, and the upper end of the connecting shaft 30 is connected to the output end of the servo motor 29. The servo motor 29 is electrically connected to the PLC controller 2. A third booster pump 17 is fixedly installed on one side of the sludge collection tank 16, and the inlet end of the third booster pump 17 is connected to the bottom of the sludge collection tank 16. A return water pipe 18 is installed at the outlet end of the third booster pump 17, and the return water pipe 18 is connected to the sedimentation chamber 22. The third booster pump 17 is electrically connected to the PLC controller 2.

[0031] The flocs flow into the filter cylinder 28, where they are filtered. The servo motor 29 drives the connecting shaft 30 to rotate, and the rotating connecting shaft 30 drives the filter cylinder 28 to rotate at high speed, generating centrifugal force. Under the action of centrifugal force, the flocs are dewatered. The dewatered wastewater is then injected back into the sedimentation chamber 22 for purification through the third booster pump 17 and the return water pipe 18.

[0032] A multi-stage industrial wastewater purification device includes the following purification process: Step 1: Industrial wastewater enters sedimentation chamber 22 through inlet pipe 4. Filter bucket 19 first filters the wastewater to remove large particulate impurities. The first water quality tester 8 detects the pH value, COD concentration, turbidity, and suspended solids content of the wastewater. PLC controller 2 provides a water quality adjustment plan based on the detection data, adding acid-base regulator to sedimentation chamber 22 to mix and react with the wastewater, adjusting the pH value of the wastewater to 7.0-8.5. Step 2: Add 10% polyaluminum chloride solution to sedimentation chamber 22 and stir to mix thoroughly with the wastewater. The aluminum ions generated by the hydrolysis of polyaluminum chloride solution will undergo adsorption and coagulation reactions with suspended solids and colloidal substances in the wastewater to form fine flocs. Then add 0.5% anionic polyacrylamide solution to sedimentation chamber 22 and stir to mix thoroughly with the wastewater. The anionic polyacrylamide solution will promote the collision and coagulation of the fine flocs to form dense large flocs. The flocs will settle to the bottom under the action of gravity. Step 3: Start the first booster pump 9 to draw the supernatant in the sedimentation chamber 22 and send it through the first water supply pipe 26 into the filter assembly 25 for multi-stage filtration. The quartz sand layer 2502 filters the wastewater to remove larger suspended solids and colloids and reduce the turbidity to below 5 NTU. The activated carbon layer 2503 adsorbs the wastewater to remove residual organic matter, color and odor. The fine filter layer 2504 intercepts the wastewater to remove fine impurities and suspended solids. The wastewater after multi-stage filtration then enters the oxidation chamber 23 through the first water supply pipe 26. Step 4: Start the ozone generator 11 to generate ozone. The ozone is sent into the aeration component 20 through the connecting pipe 12. The ozone is released into the wastewater through the aeration holes on the aeration component 20. At the same time, hydrogen peroxide and titanium-based catalyst are added to the oxidation chamber 23. Under the catalytic action of the supported titanium-based catalyst, ozone and hydrogen peroxide synergistically generate highly oxidizing hydroxyl radicals. The hydroxyl radicals react with the recalcitrant organic matter in the wastewater to decompose it into small molecule organic matter, thereby reducing the COD concentration of the wastewater. Step 5: Temperature sensor 6 detects the temperature of wastewater in oxidation chamber 23. PLC controller 2 automatically adjusts the working state of heating strip 21 according to the monitored temperature data. Heating strip 21 is evenly distributed in the four corners of oxidation chamber 23. When the temperature is low, heating strip 21 is activated to heat the wastewater in oxidation chamber 23 from all directions. The catalytic oxidation temperature is controlled at 25-35℃. Step Six: After the catalytic oxidation degradation is completed, the second booster pump 10 is started to send the wastewater after catalytic oxidation treatment into the membrane separation module 7 through the second water supply pipe 27. The membrane separation module 7 intercepts pollutants such as trace suspended solids, heavy metal ions, and residual organic matter in the wastewater, and the purified water that meets the standards enters the water storage chamber 24. The second water quality tester 13 detects the water quality indicators of the purified water to determine whether it meets the requirements for industrial production reuse. The drain valve 14 is then opened to discharge the obtained purified water. Step 7: After purification, open the drain valve 15 to discharge the flocs at the bottom of the sedimentation chamber 22 into the filter cylinder 28 for solid-liquid separation. The servo motor 29 drives the connecting shaft 30 to rotate. The rotating connecting shaft 30 drives the filter cylinder 28 to rotate at high speed, generating centrifugal force. Under the action of centrifugal force, the flocs are thrown against the inner wall of the filter cylinder 28 to concentrate and dewater the flocs, thereby achieving sludge reduction and disposal. Start the third booster pump 17 to extract the separated wastewater and inject it back into the sedimentation chamber 22 through the return water pipe 18 for purification.

[0033] In summary: By integrating the sedimentation chamber, oxidation chamber, and water storage chamber into a single purification tank, and modularly connecting the filtration and membrane separation components with the purification tank, multiple separate tanks are eliminated. This approach abandons the single biological treatment method and integrates multiple processes such as coagulation sedimentation, multi-stage filtration, ozone and hydrogen peroxide catalytic oxidation, and membrane separation. It can not only efficiently remove COD but also effectively remove suspended solids, colloids, heavy metal ions, color, odor, and other pollutants. It is suitable for treating complex industrial wastewater. The filter cartridge generates centrifugal force through high-speed rotation to concentrate and dewater the sludge, achieving sludge reduction. The water after sludge dewatering is returned to the sedimentation chamber for further purification via a third booster pump and return water pipe, realizing the recycling of water resources in the sludge. The modular integration of functional units such as coagulation sedimentation, filtration, oxidation, membrane separation, clear water storage, and sludge treatment greatly simplifies the layout, reduces installation and operating costs, and upgrades from a single process combination to multi-process synergistic treatment, integrating physical, chemical, and physicochemical combined treatment methods, making it suitable for industrial wastewater with complex composition and many types of pollutants.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage industrial wastewater purification device, comprising a purification tank (1), a partition (3), an inlet pipe (4), a membrane separation assembly (7), a first booster pump (9), a second booster pump (10), and a filter assembly (25), characterized in that: The partition (3) is fixedly installed inside the purification box (1), and the purification box (1) is divided into a sedimentation chamber (22), an oxidation chamber (23), and a water storage chamber (24) by the partition (3). The inlet ends of the first booster pump (9) and the second booster pump (10) are respectively connected to the sedimentation chamber (22) and the oxidation chamber (23). A first water supply pipe (26) is installed between the first booster pump (9) and the filter assembly (25). The filter assembly (25) and the oxidation chamber (23) are connected by the first water supply pipe (26). A second water supply pipe (27) is installed between the booster pump (10) and the membrane separation component (7). An aeration component (20) is fixedly installed at the bottom of the oxidation chamber (23). An ozone generator (11) is fixedly installed below the purification box (1), and a connecting pipe (12) is installed between the ozone generator (11) and the aeration component (20). A PLC controller (2) is fixedly installed at the front end of the purification box (1), and the first booster pump (9), the second booster pump (10), and the ozone generator (11) are electrically connected to the PLC controller (2).

2. The multi-stage industrial wastewater purification equipment according to claim 1, characterized in that: The inlet pipe (4) is fixedly installed above one end of the purification box (1), and the outlet end of the inlet pipe (4) extends into the interior of the sedimentation chamber (22). A filter bucket (19) is fixedly installed on the top of the sedimentation chamber (22), and the filter bucket (19) is installed below the inlet pipe (4).

3. The multi-stage industrial wastewater purification equipment according to claim 1, characterized in that: The sedimentation chamber (22) is equipped with a stirring mechanism (5). The stirring mechanism (5) includes a horizontal plate (501), a stirring motor (502), and a stirring paddle (503). The horizontal plate (501) is horizontally fixed on the top of the purification box (1). The stirring motor (502) is fixedly installed above the horizontal plate (501). The upper end of the stirring paddle (503) is connected to the output end of the stirring motor (502). The stirring motor (502) is electrically connected to the PLC controller (2).

4. The multi-stage industrial wastewater purification equipment according to claim 3, characterized in that: The filter assembly (25) includes a tank (2501), a quartz sand layer (2502), an activated carbon layer (2503), and a fine filter screen layer (2504). The quartz sand layer (2502), the activated carbon layer (2503), and the fine filter screen layer (2504) are installed horizontally and parallel to each other from top to bottom inside the tank (2501). Both the membrane separation assembly (7) and the filter assembly (25) are equipped with backwashing mechanisms.

5. The multi-stage industrial wastewater purification equipment according to claim 4, characterized in that: A temperature sensor (6) is fixedly installed on the inner wall of the oxidation chamber (23). A heating strip (21) is fixedly installed vertically at each of the four corners of the oxidation chamber (23). The temperature sensor (6) and the heating strip (21) are electrically connected to the PLC controller (2).

6. The multi-stage industrial wastewater purification equipment according to claim 5, characterized in that: A first water quality detector (8) and a second water quality detector (13) are fixedly installed on one side of the purification box (1), and the first water quality detector (8) and the second water quality detector (13) are respectively connected to the sedimentation chamber (22) and the water storage chamber (24). The first water quality detector (8) includes a pH sensor, a COD concentration sensor, a turbidity sensor and a suspended solids content sensor. The second water quality detector (13) includes a pH sensor, a COD concentration sensor, a turbidity sensor and a conductivity sensor. A drain valve (14) is fixedly installed on one side of the bottom of the purification box (1), and the drain valve (14) is connected to the water storage chamber (24). The first water quality detector (8) and the second water quality detector (13) are electrically connected to the PLC controller (2).

7. The multi-stage industrial wastewater purification equipment according to claim 6, characterized in that: A drain valve (15) is fixedly installed on one side of the bottom of the purification box (1), and one end of the drain valve (15) is connected to the sedimentation chamber (22). The bottom of the sedimentation chamber (22) is inclined toward the drain valve (15). A sludge collection tank (16) is installed below one side of the purification box (1). A filter cylinder (28) is rotatably installed inside the sludge collection tank (16). The other end of the drain valve (15) passes through the sludge collection tank (16) and extends into the interior of the filter cylinder (28). A servo motor (29) is fixedly installed above the sludge collection tank (16). A connecting shaft (30) is fixedly installed inside the filter cylinder (28). The upper end of the connecting shaft (30) is connected to the output end of the servo motor (29). The servo motor (29) is electrically connected to the PLC controller (2).

8. The multi-stage industrial wastewater purification equipment according to claim 7, characterized in that: A third booster pump (17) is fixedly installed on one side of the sludge collection tank (16), and the inlet end of the third booster pump (17) is connected to the bottom of the sludge collection tank (16). A return water pipe (18) is installed at the outlet end of the third booster pump (17), and the return water pipe (18) is connected to the sedimentation chamber (22). The third booster pump (17) is electrically connected to the PLC controller (2).

9. The purification process of the multi-stage industrial wastewater purification equipment according to claim 8, characterized in that, Includes the following steps: Step 1: Industrial wastewater enters the sedimentation chamber (22) through the inlet pipe (4). The first water quality tester (8) detects the pH value, COD concentration, turbidity and suspended solids content of the wastewater. The PLC controller (2) provides a water quality adjustment plan based on the detection data and adds acid-base regulator to the sedimentation chamber (22) to adjust the pH value of the wastewater to 7.0-8.

5. Step 2: Add coagulant and coagulant aid to the sedimentation chamber (22) and mix them with the wastewater. At the same time, turn on the stirring motor (502) to drive the stirring paddle (503) to rotate. The rotating stirring paddle (503) stirs the water in the sedimentation chamber (22), causing the suspended solids and colloidal substances in the wastewater to form dense flocs. The flocs settle to the bottom under the action of gravity. Step 3: Turn on the first booster pump (9) to extract the supernatant in the sedimentation chamber (22) and send it through the first water supply pipe (26) into the filter assembly (25) for multi-stage filtration. The wastewater after multi-stage filtration enters the oxidation chamber (23). Step 4: Start the ozone generator (11) to generate ozone and send it into the aeration component (20) through the connecting pipe (12). The ozone is released into the wastewater through the aeration holes on the aeration component (20). At the same time, hydrogen peroxide and titanium-based catalyst are added to the oxidation chamber (23) for catalytic oxidation and degradation. Step 5: Temperature sensor (6) detects the temperature of wastewater in oxidation chamber (23). When the temperature is low, heating bar (21) is activated to heat the wastewater in oxidation chamber (23). The catalytic oxidation temperature is controlled at 25-35℃. Step 6: Start the second booster pump (10) to send the wastewater after catalytic oxidation treatment into the membrane separation unit (7) through the second water supply pipe (27). The membrane separation unit (7) performs deep purification on the wastewater. The purified water enters the water storage chamber (24). The second water quality detector (13) detects the water quality indicators of the purified water. Open the drain valve (14) to discharge the obtained purified water. Step 7: After purification is completed, open the drain valve (15) to let the flocs at the bottom of the sedimentation chamber (22) flow into the high-speed rotating filter cylinder (28). The high-speed rotating filter cylinder (28) generates centrifugal force, and under the action of centrifugal force, the water in the flocs is thrown out for dehydration treatment.

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