An emulsion wastewater treatment system and method

Abstract

The application relates to an emulsion wastewater treatment system and method, and relates to the field of industrial wastewater treatment.The system comprises a pretreatment module, an emulsion separation module, a metal particle removal module and an active agent degradation module.The pretreatment module comprises a treatment tank, a filter cartridge and an impurity discharge assembly.The treatment tank is used for containing emulsion.The filter cartridge is provided with a material falling area opposite to the impurity discharge assembly and a filtering area opposite to an emulsion water outlet.The filter cartridge can transport large-particle impurities in the filtering area to the material falling area.The height of the impurity discharge assembly is lower than the part of the filter cartridge located in the material falling area, so that the large-particle impurities fall onto the impurity discharge assembly.The impurity discharge assembly can discharge and collect the large-particle impurities.The height of the emulsion water outlet is higher than the part of the filter cartridge located in the filtering area, so that the large-particle impurities are accumulated on the filter cartridge.The application has the effects of not needing to interrupt emulsion supply during shutdown, keeping the continuous running time of the filtering system and improving the emulsion filtering efficiency.

Description

Technical Field

[0001] This application relates to the field of industrial wastewater treatment, and in particular to an emulsion wastewater treatment system and method. Background Technology

[0002] Industrial waste emulsions mainly originate from cutting, lubrication, and cleaning processes in industries such as machining and metal rolling. Their composition is complex, containing mineral oil, surfactants, heavy metal particles, and high concentrations of organic matter. If this wastewater is discharged directly without treatment, the oils will form an oil film in the water, hindering oxygen exchange; the surfactants will disrupt the microbial ecological balance; and the heavy metals will pose biotoxicity and cumulative risks, seriously threatening the ecological environment and human health.

[0003] In existing technologies, a filter screen is needed to filter particulate matter in the emulsion. As filtration proceeds, a large amount of particulate matter accumulates on the filter screen, which can clog the emulsion and prevent it from passing through. Manual cleaning of the accumulated particulate matter on the filter screen is required. When cleaning the filter screen, the supply of emulsion needs to be shut off, which takes a lot of filtration time and reduces the filtration efficiency of the emulsion. Summary of the Invention

[0004] To address the issue that the supply of emulsion needs to be shut off during filter cleaning, which reduces the filtration efficiency of the emulsion, this application provides an emulsion wastewater treatment system and method.

[0005] The emulsion wastewater treatment system and method provided in this application adopts the following technical solution:

[0006] An emulsion wastewater treatment system includes a pretreatment module, an emulsion oil separation module, a metal particle removal module, and an surfactant degradation module. The pretreatment module can separate large particulate impurities. The emulsion oil separation module can break down emulsified oil droplets and separate free oil and suspended solids. The metal particle removal module can remove dissolved / suspended metals. The surfactant degradation module can decompose recalcitrant surfactants. The pretreatment module includes a treatment tank, a filter cartridge, and an impurity discharge assembly. The treatment tank is used to hold the emulsion. The filter cartridge has a discharge area opposite to the impurity discharge assembly and a filtration area opposite to the emulsion outlet. The filter cartridge can transport large particulate impurities from the filtration area to the discharge area. The height of the impurity discharge assembly is lower than the portion of the filter cartridge located in the discharge area, so that large particulate impurities can fall onto the impurity discharge assembly. The impurity discharge assembly can collect the discharged large particulate impurities. The height of the emulsion outlet is higher than the portion of the filter cartridge located in the filtration area, so that large particulate impurities can accumulate on the filter cartridge.

[0007] By adopting the above technical solution, the system can sequentially pretreat emulsion wastewater, separate emulsion oil, remove metal particles, and degrade surfactants. The pretreatment module can separate large particulate impurities, and the rotating filter cylinder transports large particulate impurities from the filtration zone to the discharge zone without stopping the emulsion supply, thus maintaining continuous operation of the filtration system and improving the filtration efficiency of the emulsion. At the same time, the impurity discharge component can collect the discharged large particulate impurities.

[0008] Preferably, the filter cartridge is rotatably mounted on the treatment tank, and the axis of rotation of the filter cartridge is coplanar with the horizontal plane. A rotating motor is fixedly mounted on the treatment tank and connected to the filter cartridge to drive the filter cartridge to rotate.

[0009] By adopting the above technical solution, the stability of the filter cartridge rotation is ensured by using a drive motor to drive the filter cartridge.

[0010] Preferably, a plurality of baffles are fixedly provided on the inner peripheral wall of the filter cylinder. The plurality of baffles are arranged circumferentially along the inner peripheral wall of the filter cylinder, and each baffle is arranged along the axial direction of the filter cylinder. A storage trough is formed between two adjacent baffles, and the impurities filtered out by the filter cylinder can accumulate in the storage trough.

[0011] By adopting the above technical solution, multiple baffles arranged circumferentially and distributed axially on the inner peripheral wall of the filter cylinder form a storage trough, which can better collect the impurities filtered out by the filter cylinder, prevent impurities from falling randomly during the filtration process, ensure that the impurities are stably rotated with the filter cylinder to the discharge area, and improve the reliability of impurity cleaning.

[0012] Preferably, the material discharge area is located at the highest point of the filter cylinder, and the filtration area is located at the lowest point of the filter cylinder. A guide plate is fixedly provided on the treatment tank, which is opposite to the inner peripheral wall of the filter cylinder. The guide plate is located between the material discharge area and the filtration area. The baffle can be slidably connected to the guide plate to seal the opening of the storage tank.

[0013] By adopting the above technical solution, the opening of the storage tank is blocked during the rotation of the storage tank from the filtration zone to the discharge zone by utilizing the height difference of the filter cylinder and the cooperation between the guide plate and the baffle. This prevents large particles of impurities from spilling out midway and ensures that the impurities can be accurately transported to the discharge zone for discharge, thereby further improving the filtration efficiency of the emulsion and the accuracy of impurity removal.

[0014] Preferably, the treatment tank is provided with a vibration component located in the material discharge area. The vibration component acts on the filter cylinder to generate vibration. The filter cylinder and the vibration component are connected by a transmission component to drive the vibration component to work.

[0015] By adopting the above technical solution, a vibration component is set in the material drop area and driven by the filter cylinder through the transmission component, which can make the filter cylinder vibrate, making it easier for large particles of impurities on the filter cylinder to fall to the impurity discharge component, thus reducing impurity residue.

[0016] Preferably, the vibration assembly includes a vibration rod and a vibration generating spring. A support frame is fixedly provided on the treatment tank above the filter cylinder. The vibration rod is slidably disposed on the support frame. One end of the vibration generating spring is connected to the support frame, and the other end is connected to the vibration rod, so as to push the vibration rod to impact the filter cylinder.

[0017] By adopting the above technical solution, the vibration spring pushes the vibrating rod to strike the filter cylinder and generate vibration, which makes it easier for large particles of impurities accumulated on the filter cylinder to fall to the impurity discharge component, reducing the residue of large particles of impurities on the filter cylinder, further ensuring the continuous and effective filtration of the filter cylinder, and improving the filtration efficiency of the emulsion.

[0018] Preferably, the transmission assembly includes a transmission shaft and a transmission cam. The transmission shaft is rotatably connected to the support frame, and the transmission cam is fixedly mounted on the transmission shaft. The vibration rod is provided with a transmission part connected to the transmission cam. The transmission cam can push the vibration rod to compress the vibration generating spring and disengage from the transmission part, so that the vibration generating spring can push the vibration rod to impact the filter cylinder. The filter cylinder is connected to the transmission shaft through a gear transmission mechanism.

[0019] By adopting the above technical solution, when the filter cylinder rotates, the gear transmission mechanism drives the transmission shaft to rotate, which causes the transmission cam to push the vibrating rod to compress and vibrate, causing the spring to contract. When the transmission cam is disengaged from the transmission part, the vibration spring pushes the vibrating rod to hit the filter cylinder, causing the filter cylinder to vibrate and promoting the smoother falling of large particles of impurities in the material drop zone onto the impurity discharge component.

[0020] Preferably, the impurity discharge assembly includes a conveyor belt, a rotating roller, and a drive motor. A conveyor frame is fixedly provided on the treatment tank. The rotating roller is rotatably connected to the conveyor frame. The conveyor belt is wound around the rotating roller and located below the discharge area to receive impurities. The drive motor is fixedly provided on the conveyor frame. The output shaft of the drive motor is connected to the rotating roller to drive the rotating roller to rotate. The conveyor belt can move along the axial direction of the filter cylinder to discharge impurities.

[0021] By adopting the above technical solution, the drive motor drives the rotating roller to rotate, causing the conveyor belt wrapped on the rotating roller to move along the axial direction of the filter cylinder. This can continuously receive impurities falling from the material drop area and transport them out of the treatment tank, achieving efficient discharge of impurities and preventing impurities from accumulating in the treatment tank and affecting the filtration effect.

[0022] Preferably, two guide plates are fixedly provided on the conveyor frame. The two guide plates are located on both sides of the conveyor belt, and a guide channel extending to the drop area is formed between the two guide plates. The guide channel can guide impurities to fall onto the conveyor belt.

[0023] By adopting the above technical solution, the material guide channel can guide impurities falling from the drop area to fall accurately onto the conveyor belt, ensuring that the impurities can be smoothly discharged from the conveyor belt, making the impurity discharge process more stable and reliable.

[0024] A method for treating emulsion wastewater, using the aforementioned emulsion wastewater treatment system, includes the following steps: S1, pretreatment stage: The emulsion to be treated is introduced into the filtration zone of a filter cartridge through the emulsion outlet. Large particles of impurities accumulate on the part of the filter cartridge located in the filtration zone. The rotation of the filter cartridge transports the filtered large particles of impurities to the discharge zone. The part of the filter cartridge that has just rotated into the filtration zone filters the emulsion. The large particles of impurities that have rotated to the discharge zone fall onto the impurity discharge component for discharge; S2, demulsification and oil-water separation: The emulsion treated in step S1 is... The emulsion is passed into the emulsion-oil separation module to break up the emulsion-state oil droplets and separate free oil and suspended solids; S3, metal particle removal: the emulsion treated in step S2 is passed into the metal particle removal module to remove dissolved / suspended metals; S4, surfactant degradation: the emulsion treated in step S3 is passed into the surfactant degradation module to decompose recalcitrant surfactants; S5, deep treatment and reuse: the emulsion treated in step S4 is treated with activated carbon to adsorb organic matter, then a membrane system is used to retain large molecules, and finally the emulsion is disinfected with ultraviolet light.

[0025] By adopting the above technical solution, the emulsion is first pretreated to remove large particulate impurities, then demulsified to separate oil and water, then metal particles are removed and surfactants are degraded, and finally deep treatment and reuse are carried out. This can comprehensively treat various pollutants in emulsion wastewater, so that the treated emulsion meets the reuse standard, reduces environmental pollution, and realizes the effective utilization of resources.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The emulsion to be processed is introduced into the filtration zone of the filter cartridge through the emulsion outlet. Large particles of impurities accumulate on the part of the filter cartridge located in the filtration zone. The rotation of the filter cartridge transports the filtered large particles of impurities to the discharge zone. The part of the filter cartridge that rotates to the filtration zone filters the emulsion. The large particles of impurities that rotate to the discharge zone fall onto the impurity discharge component for discharge. During the process of cleaning large particles of impurities, there is no need to stop the machine and interrupt the emulsion supply, thereby improving the filtration efficiency of the emulsion.

[0028] 2. The emulsified wastewater is treated in sequence by separating large particulate impurities, breaking down emulsified oil droplets and separating free oil and suspended solids, removing dissolved / suspended metals, and decomposing recalcitrant surfactants.

[0029] 3. The rotating filter cartridge transports large particles of impurities from the filtration zone to the discharge zone. The new filtration zone continues to filter, and the machine does not stop when cleaning impurities, thus accelerating the filtration speed of the emulsion. Attached Figure Description

[0030] Figure 1 This is a flowchart of an emulsion wastewater treatment system according to an embodiment of this application.

[0031] Figure 2 This is a schematic diagram showing the structure of the preprocessing module.

[0032] Figure 3 This is a top view showing the preprocessing module.

[0033] Figure 4 It is along Figure 3 A cross-sectional view along line AA in the middle.

[0034] Figure 5 It is along Figure 3 A cross-sectional view along the BB line.

[0035] Figure 6 yes Figure 2 Enlarged view of section C.

[0036] Explanation of reference numerals in the attached drawings: 1. Treatment tank; 11. Bearing seat; 2. Filter cylinder; 21. Material discharge area; 22. Filter area; 23. Side guard; 24. Storage tank; 3. Impurity discharge assembly; 31. Conveyor belt; 32. Rotating roller; 33. Drive motor; 34. Conveyor frame; 35. Guide plate; 36. Guide channel; 41. Rotating motor; 42. Gear ring; 43. Drive gear; 5. Guide plate; 6. Vibration assembly; 61. Vibration rod; 611. Transmission part; 612. Hammer head; 62. Vibration generating spring; 63. Support frame; 7. Transmission assembly; 71. Transmission shaft; 72. Transmission cam; 73. Gear transmission mechanism; 731. Driven gear; 8. Emulsion outlet. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0038] This application discloses an emulsion wastewater treatment system and method.

[0039] Reference Figure 1 An emulsion wastewater treatment system includes a pretreatment module, an emulsion oil separation module, a metal particle removal module, an surfactant degradation module, a deep treatment and reuse module, and a sludge treatment module. The pretreatment module can separate large particulate impurities, the emulsion oil separation module can break down emulsified oil droplets and separate free oil and suspended solids, the metal particle removal module can remove dissolved / suspended metals, the surfactant degradation module can decompose recalcitrant surfactants, and the sludge treatment module treats the sludge and precipitates generated during the pretreatment, emulsion oil separation, metal particle removal, and surfactant degradation processes.

[0040] Reference Figure 2 , Figure 3 and Figure 4 The pretreatment module includes a treatment tank 1, a filter cylinder 2, and an impurity discharge assembly 3. The treatment tank 1 is used to hold the emulsion. The emulsion is guided through a pipe to the filter cylinder 2 at the opening of the treatment tank 1. The outlet of the pipe is the emulsion outlet 8, which faces the bottom of the treatment tank 1. The mesh size of the filter cylinder 2 is 1-5mm. In this embodiment, the mesh size is 3mm, corresponding to large particles larger than 3mm in the emulsion. The lower half of the filter cylinder 2 is embedded in the top of the treatment tank 1, and the rotation axis of the filter cylinder 2 is coplanar with the horizontal plane. Both ends of the filter cylinder 2 are rotatably connected to the treatment tank 1 through a bearing-bearing seat 11 structure.

[0041] Reference Figure 3 , Figure 5 The filter cylinder 2 is provided with a dropping area 21 opposite to the impurity discharge component 3 and a filtration area 22 opposite to the emulsion outlet 8. The dropping area 21 is located at the highest point of the filter cylinder 2, and the filtration area 22 is located at the lowest point of the filter cylinder 2. One end of the impurity discharge component 3 is located inside the filter cylinder 2, and the other end extends out from the port at one end of the filter cylinder 2. The impurity discharge component 3 is located above the emulsion outlet 8 and below the dropping area 21, so that large particles of impurities fall onto the impurity discharge component 3. The impurity discharge component 3 removes the fallen large particles of impurities from the filter cylinder 2, completing the discharge and collection of large particles of impurities. The filter cylinder 2 can rotate to transport the large particles of impurities in the filtration area 22 to the dropping area 21, so that the large particles of impurities can be transferred from the filtration area 22 to the dropping area 21. The part of the filter cylinder 2 that has just entered the filtration area 22 continues to filter the emulsion, so that the large particles of impurities accumulate on the filter cylinder 2.

[0042] The emulsion to be processed is introduced into the filtration zone 22 of the filter cylinder 2 through the emulsion outlet 8. Large particles of impurities accumulate on the part of the filter cylinder 2 located in the filtration zone 22. The rotation of the filter cylinder 2 transports the filtered large particles of impurities to the discharge zone 21. The part of the filter cylinder 2 that has just rotated to the filtration zone 22 filters the emulsion. The large particles of impurities that have rotated to the discharge zone 21 fall onto the impurity discharge component 3 for discharge. During the process of cleaning large particles of impurities, there is no need to stop the machine and interrupt the emulsion supply, thereby improving the filtration efficiency of the emulsion.

[0043] Reference Figure 2 A rotary motor 41 is fixedly installed on the treatment tank 1. The axis of the output shaft of the rotary motor 41 is parallel to the axis of the filter cylinder 2. A gear ring 42 is fixedly installed at one end of the filter cylinder 2. The gear ring 42 is arranged around the circumference of the filter cylinder 2. A drive gear 43 is coaxially fixed on the output shaft of the rotary motor 41. The drive gear 43 is externally meshed with the gear ring 42, so that the rotary motor 41 can drive the filter cylinder 2 to rotate.

[0044] Reference Figure 3 , Figure 5 Multiple baffles 23 are fixedly provided on the inner peripheral wall of the filter cylinder 2. The width direction of each baffle 23 is in the same direction as the radial direction of the filter cylinder 2. The multiple baffles 23 are evenly spaced along the circumference of the inner peripheral wall of the filter cylinder 2. Each baffle 23 is arranged along the axial direction of the filter cylinder 2, so that a storage trough 24 is formed between two adjacent baffles 23. When the part of the filter cylinder 2 located in the filtration zone 22 filters impurities in the emulsion, the impurities filtered out by the filter cylinder 2 can accumulate in the storage trough 24, which can better collect the impurities filtered out by the filter cylinder 2, prevent impurities from falling randomly during the filtration process, ensure that the impurities are stably rotated with the filter cylinder 2 to the discharge zone 21, and improve the reliability of impurity cleaning.

[0045] Reference Figure 3 , Figure 5 A guide plate 5 is fixedly installed on the treatment tank 1, opposite to the inner circumferential wall of the filter cylinder 2. The guide plate 5 is located between the discharge area 21 and the filter area 22. The guide plate 5 is a fan-shaped plate concentric with the center of the filter cylinder 2. There are two guide plates 5, which are arranged opposite each other circumferentially with respect to the filter cylinder 2. A baffle 23 is left between the outer side wall of each guide plate 5 and the inner side wall of the filter cylinder 2, so that the baffle 23 and the guide plate 5 are in close sliding connection, thereby sealing the opening of the storage tank 24. By using the cooperation of the guide plate 5 and the baffle 23, the opening of the storage tank 24 is sealed during the rotation from the filter area 22 to the discharge area 21, preventing large particles of impurities from spilling midway and ensuring that impurities can be accurately transported to the discharge area 21 for discharge, further improving the filtration efficiency of the emulsion and the accuracy of impurity removal.

[0046] Reference Figure 2 , Figure 6 The treatment tank 1 is equipped with a vibration component 6 located in the material discharge area 21. The vibration component 6 acts on the filter cylinder 2 to generate vibration. The filter cylinder 2 and the vibration component 6 are connected by a transmission component 7 to drive the vibration component 6 to work.

[0047] Reference Figure 2 , Figure 6 Multiple sets of vibration components 6 are arranged along the axial direction of the filter cylinder 2. Each set of vibration components 6 includes a vibration rod 61 and a vibration generating spring 62. A support frame 63 is fixedly provided on two bearing seats 11. The support frame 63 is located above the filter cylinder 2. The vibration rod 61 includes a transmission part 611 and a hammer head 612. The transmission part 611 is L-shaped and passes through the support frame 63 in the vertical direction and is slidably connected to the support frame 63. The hammer head 612 is located below the transmission part 611. The vibration generating spring 62 is sleeved on the transmission part 611 and is located between the support frame 63 and the hammer head 612. One end of the vibration generating spring 62 abuts against the support frame 63, and the other end abuts against the support frame 63. When the compressed vibration generating spring 62 returns to its original state, it pushes the hammer head 612 to hit the filter cylinder 2, causing the filter cylinder 2 to vibrate and vibrate large particle impurities attached to the filter cylinder 2 to fall onto the impurity discharge component 3.

[0048] Reference Figure 2 , Figure 6 In this embodiment, the transmission assembly 7 includes a transmission shaft 71 and a transmission cam 72. The transmission shaft 71 is positioned above the filter cylinder 2 along its axial direction. Both ends of the transmission shaft 71 are rotatably connected to bearing seats 11 on the same side. The filter cylinder 2 is connected to the transmission shaft 71 via a gear transmission mechanism 73. In this embodiment, the gear transmission mechanism 73 includes a driven gear 731, which is coaxially fixed on the transmission shaft 71. The driven gear 731 meshes externally with the gear ring 42, causing the filter cylinder 2 to drive the transmission shaft 71 to rotate. The transmission cam 72 corresponds one-to-one with the vibrating rod 61. The transmission cam 72 is fixed on the transmission shaft 71, such that the center of the base circle of the transmission cam 72 is collinear with the axis of the transmission shaft 71. The end of the transmission part 611 away from the hammer head 612 is located above the transmission cam 72.

[0049] When the transmission cam 72 pushes the vibrating rod 61, the push stroke of the transmission cam 72 pushes the transmission part 611 to rise. At this time, the vibration generating spring 62 is compressed. When the transmission cam 72 pushes the transmission part 611 to the highest point, the transmission cam 72 disengages from the transmission part 611. The vibration generating spring 62 pushes the transmission part 611 to move downward, causing the hammer head 612 to hit the filter cylinder 2. The vibration generating spring 62 pushes the vibrating rod 61 to hit the filter cylinder 2 and generate vibration, making it easier for large particles of impurities accumulated on the filter cylinder 2 to fall to the impurity discharge component 3, reducing the residue of large particles of impurities on the filter cylinder 2, further ensuring the continuous and effective filtration of the filter cylinder 2, and improving the filtration efficiency of the emulsion.

[0050] Reference Figure 3 , Figure 4 and Figure 5 In this embodiment, the impurity discharge assembly 3 includes a conveyor belt 31, rotating rollers 32, and a drive motor 33. A conveyor frame 34 is fixedly installed on the treatment tank 1. One end of the conveyor frame 34 is located inside the filter cylinder 2, and the other end extends out of the filter cylinder 2. There are two rotating rollers 32, which are rotatably installed at both ends of the conveyor frame 34. The conveyor belt 31 is wound around the two rotating rollers 32, so that the rotating rollers 32 drive the conveyor belt 31 to rotate, thereby moving the impurities on the conveyor belt 31. The drive motor 33 is fixedly installed on the conveyor frame 34, and the output shaft of the drive motor 33 is connected to the rotating rollers 32, driving the rotating rollers 32 to rotate. The drive motor 33 drives the rotating rollers 32 to rotate, so that the conveyor belt 31 wound around the rotating rollers 32 moves along the axial direction of the filter cylinder 2. It can continuously receive impurities falling from the drop area 21 and transport them out of the treatment tank 1, realizing efficient discharge of impurities and avoiding the accumulation of impurities in the treatment tank 1, which affects the filtration effect.

[0051] Reference Figure 3 , Figure 5 Two guide plates 35 are fixedly installed on the conveyor frame 34. The two guide plates 35 are located on both sides of the conveyor belt 31 and inside the filter cylinder 2. The two guide plates 35 form a guide channel 36 that extends to the drop area 21. Large particles of material falling from the drop area 21 are guided to fall onto the conveyor belt 31 along the guide channel 36. The guide channel 36 can guide the impurities falling from the drop area 21 to fall accurately onto the conveyor belt 31, ensuring that the impurities can be discharged smoothly from the conveyor belt 31, making the impurity discharge process more stable and reliable.

[0052] The implementation principle of the emulsion wastewater treatment system in this application embodiment is as follows: the emulsion wastewater is subjected to pretreatment, emulsion oil separation, metal particle removal and surfactant degradation treatment in sequence; the pretreatment module can separate large particulate impurities, and the filter cylinder 2 rotates to transport large particulate impurities from the filtration zone 22 to the discharge zone 21 without stopping the emulsion supply, so that the filtration system can maintain continuous and effective operation time and improve the emulsion filtration efficiency. At the same time, the impurity discharge component 3 can collect the discharged large particulate impurities.

[0053] A method for treating emulsion wastewater includes the following steps:

[0054] S1, Preprocessing Stage

[0055] The emulsion to be processed is fed into the filtration zone 22 of the filter cylinder 2 through the emulsion outlet 8. Large particles of impurities accumulate on the part of the filter cylinder 2 located in the filtration zone 22. The filter cylinder 2 rotates to transport the filtered large particles of impurities to the discharge zone 21. The part of the filter cylinder 2 that has just rotated to the filtration zone 22 filters the emulsion. The large particles of impurities that have rotated to the discharge zone 21 fall onto the conveyor belt 31. The conveyor belt 31 removes the large particles of impurities from the filter cylinder 2 for discharge.

[0056] Treatment tank 1 is connected to an external pH adjustment tank, and the pH is adjusted to the optimal demulsification range of pH 9-11 through an automatic dosing system (sulfuric acid / sodium hydroxide).

[0057] S2, Demulsification and Oil-Water Separation

[0058] The emulsion processed in step S1 is passed into the emulsion-oil separation module to break up the emulsified oil droplets and separate free oil and suspended matter.

[0059] The emulsion separation module includes:

[0060] Chemical demulsification reaction tank: Add demulsifier alkali and equip with a static mixer.

[0061] Dissolved air flotation (DAF): uses microbubbles to adhere oil droplets to the surface and float them to the surface. It includes a dissolved air pump, pressure tank, and sludge scraper.

[0062] Inclined plate oil separator: It uses gravity to separate free oil and is equipped with an oil collection tank and an oil skimmer.

[0063] S3, Metal Particle Removal

[0064] The emulsion processed in step S2 is passed into the metal particle removal module to remove dissolved / suspended metal.

[0065] The metal particle removal module includes:

[0066] Chemical precipitation tank: NaOH is added to form metal hydroxide precipitates, and it is equipped with an online pH / ORP monitor.

[0067] Multi-media filter: Quartz sand + anthracite filter layer removes suspended metal particles.

[0068] S4, Surfactant degradation

[0069] The emulsion treated in step S3 is passed into the surfactant degradation module to decompose the recalcitrant surfactant.

[0070] The surfactant degradation module includes:

[0071] Biological treatment unit:

[0072] Activated sludge reactor: Aeration system (Roots blower + microporous aeration head) promotes microbial degradation.

[0073] Advanced oxidation systems:

[0074] Ozone oxidation tower: ozone generator (10-20 mg / L dosage) + contact reaction tower;

[0075] Fenton reactor: H2O2 + Fe²⁺ catalytic oxidation of recalcitrant organic matter.

[0076] S5, Deep Processing and Reuse

[0077] Organic matter is adsorbed onto the emulsion treated in step S4 using activated carbon, macromolecular substances are then retained using a membrane system, and the emulsion is then disinfected using ultraviolet light.

[0078] The deep processing and reuse module includes:

[0079] Activated carbon adsorption tower: Granular activated carbon (GAC) or powdered activated carbon (PAC) adsorbs residual organic matter.

[0080] Ultrafiltration / nanofiltration membrane systems: retain macromolecules (membrane pore size 0.01-0.1μm).

[0081] Ultraviolet sterilizer: 254nm ultraviolet lamps kill pathogens.

[0082] sludge treatment

[0083] The precipitates from S1-S4 are fed into the sludge treatment module for concentration, dewatering, and harmless disposal.

[0084] The sludge treatment module includes:

[0085] Sludge thickening tank: Gravity thickening reduces sludge volume.

[0086] Plate and frame filter press / centrifugal dewatering machine: Reduces the moisture content of sludge to 60-80%.

[0087] Sludge drying bed: Natural sun drying further dehydrates the sludge.

[0088] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An emulsion wastewater treatment system, characterized in that: It includes a pretreatment module, an emulsifiable concentrate separation module, a metal particle removal module, and an surfactant degradation module. The pretreatment module can separate large particulate impurities, the emulsifiable concentrate separation module can break down emulsified oil droplets and separate free oil and suspended matter, the metal particle removal module can remove dissolved / suspended metals, and the surfactant degradation module can decompose recalcitrant surfactants. The pretreatment module includes a treatment tank (1), a filter cylinder (2), and an impurity discharge assembly (3). The treatment tank (1) is used to hold the emulsion. The filter cylinder (2) is provided with a dropping area (21) opposite to the impurity discharge assembly (3) and a filtration area (22) opposite to the emulsion outlet (8). The filter cylinder (2) can transport large particles of impurities in the filtration area (22) to the dropping area (21). The height of the impurity discharge assembly (3) is lower than the part of the filter cylinder (2) located in the dropping area (21) so that large particles of impurities can fall onto the impurity discharge assembly (3). The impurity discharge assembly (3) can collect the large particles of impurities. The height of the emulsion outlet (8) is higher than the part of the filter cylinder (2) located in the filtration area (22) so that large particles of impurities can accumulate on the filter cylinder (2). The filter cylinder (2) is rotatably mounted on the treatment tank (1), and the rotation axis of the filter cylinder (2) is coplanar with the horizontal plane. A rotating motor (41) is fixedly mounted on the treatment tank (1), and the rotating motor (41) is connected to the filter cylinder (2) so as to drive the filter cylinder (2) to rotate. Multiple baffles (23) are fixedly provided on the inner peripheral wall of the filter cylinder (2). The multiple baffles (23) are arranged circumferentially along the inner peripheral wall of the filter cylinder (2). Each baffle (23) is arranged along the axial direction of the filter cylinder (2). A storage trough (24) is formed between two adjacent baffles (23). The impurities filtered out by the filter cylinder (2) can accumulate in the storage trough (24). The material discharge area (21) is located at the highest point of the filter cylinder (2), and the filter area (22) is located at the lowest point of the filter cylinder (2). A guide plate (5) is fixedly provided on the treatment tank (1) opposite to the inner peripheral wall of the filter cylinder (2). The guide plate (5) is located between the material discharge area (21) and the filter area (22). The baffle (23) can slide and fit against the guide plate (5) to seal the opening of the storage tank (24). The processing tank (1) is provided with a vibration component (6) located in the material drop area (21). The vibration component (6) acts on the filter cylinder (2) to generate vibration. The filter cylinder (2) and the vibration component (6) are connected by a transmission component (7) so as to drive the vibration component (6) to work. The vibration assembly (6) includes a vibration rod (61) and a vibration generating spring (62). A support frame (63) is fixedly provided on the treatment tank (1) above the filter cylinder (2). The vibration rod (61) is slidably disposed on the support frame (63). One end of the vibration generating spring (62) is connected to the support frame (63), and the other end is connected to the vibration rod (61) so as to push the vibration rod (61) to impact the filter cylinder (2). The transmission assembly (7) includes a transmission shaft (71) and a transmission cam (72). The transmission shaft (71) is rotatably connected to the support frame (63). The transmission cam (72) is fixedly mounted on the transmission shaft (71). The vibration rod (61) is provided with a transmission part (611) connected to the transmission cam (72). The transmission cam (72) can push the vibration rod (61) to compress the vibration generating spring (62) and disengage from the transmission part (611), so that the vibration generating spring (62) can push the vibration rod (61) to impact the filter cylinder (2). The filter cylinder (2) is connected to the transmission shaft (71) through a gear transmission mechanism (73).

2. The emulsion wastewater treatment system according to claim 1, characterized in that: The impurity discharge assembly (3) includes a conveyor belt (31), a rotating roller (32), and a drive motor (33). A conveyor frame (34) is fixedly provided on the treatment tank (1). The rotating roller (32) is rotatably connected to the conveyor frame (34). The conveyor belt (31) is wound around the rotating roller (32) and located below the discharge area (21) to receive impurities. The drive motor (33) is fixedly provided on the conveyor frame (34). The output shaft of the drive motor (33) is connected to the rotating roller (32) to drive the rotating roller (32) to rotate. The conveyor belt (31) can move along the axial direction of the filter cylinder (2) to discharge impurities.

3. The emulsion wastewater treatment system according to claim 2, characterized in that: Two guide plates (35) are fixedly provided on the conveyor frame (34). The two guide plates (35) are located on both sides of the conveyor belt (31). The two guide plates (35) form a guide channel (36) extending to the drop area (21). The guide channel (36) can guide impurities to fall onto the conveyor belt (31).

4. A method for treating emulsion wastewater, using the emulsion wastewater treatment system according to any one of claims 1-3, characterized in that: Includes the following steps: S1. Pretreatment stage: The emulsion to be treated is introduced into the filtration zone (22) of the filter cylinder (2) through the emulsion outlet. Large particles of impurities accumulate on the part of the filter cylinder (2) located in the filtration zone (22). The filter cylinder (2) rotates to transport the filtered large particles of impurities to the discharge zone (21). The filter cylinder (2) rotates to the part in the filtration zone (22) to filter the emulsion. The large particles of impurities that rotate to the discharge zone (21) fall onto the impurity discharge component (3) for discharge. S2. Demulsification and oil-water separation: The emulsion processed in step S1 is passed into the emulsion-oil separation module to break up the emulsified oil droplets and separate free oil and suspended matter. S3. Metal particle removal: The emulsion treated in step S2 is passed into the metal particle removal module to remove dissolved / suspended metal. S4. Surfactant degradation: The emulsion treated in step S3 is passed into the surfactant degradation module to decompose the difficult-to-degrade surfactant. S5. Deep treatment and reuse: The emulsion treated in step S4 is subjected to adsorption of organic matter by activated carbon, then a membrane system is used to retain macromolecular substances, and finally the emulsion is disinfected by ultraviolet light.

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