Treatment system and treatment method for synergistically removing odor substances and new pollutant PFAS in water

Abstract

The invention discloses a treatment system for synergistically removing odor substances and a new pollutant PFAS in water and a treatment method thereof. The treatment system comprises a pre-oxidation unit, an algae removal, adsorption and clarification unit, a membrane separation and concentration unit and a destruction unit which are connected in sequence. The pre-oxidation unit is provided with an oxidation pond with a transverse reciprocating dynamic aeration assembly, so that the ozone mass transfer efficiency is improved. The algae removal, adsorption and clarification unit enables a suspended carbon mud bed to periodically expand and contract through a pulse generator so as to strengthen adsorption. The membrane separation and concentration unit adopts a modified polyether sulfone conical-end filtering membrane and is matched with an online cleaning mechanism, so that PFAS is efficiently intercepted, and secondary pollution is avoided. The destroying unit is used for carrying out synergetic high-temperature incineration on the membrane separation concentrated water and the waste carbon mud, and PFAS is thoroughly decomposed at the temperature higher than or equal to 900 DEG C; by optimizing ozone aeration, pulse adsorption, fluorine-free membrane separation and collaborative incineration, efficient collaborative removal of odor substances and new pollutant PFAS and harmless treatment of waste are achieved, the system integration degree is high, the treatment effect is good, and the risk of secondary pollution is avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a treatment system and method for synergistically removing odorous substances and new pollutants PFAS from water. Background Technology

[0002] With the increasing severity of eutrophication in water bodies, dimethyl isoborneol (2-MIB) and geosmin (GSM), produced by the metabolism of microorganisms such as cyanobacteria and actinomycetes, have become major odor and taste substances affecting the sensory quality of drinking water. For the first time, my country's "Standards for Drinking Water Quality" (GB 5749-2022) has listed them as mandatory control indicators, with a limit of 10 ng / L for both. Meanwhile, perfluorinated and polyfluorinated alkyl compounds (PFAS, also known as "permanent chemicals") are widely present in water bodies due to their extremely strong chemical stability and bioaccumulation, posing a serious threat to human health. Appendix A of GB 5749-2022 recommends the following limits: PFOA 80 ng / L and PFOS 40 ng / L.

[0003] Currently, the main technologies for treating the aforementioned pollutants include ozone oxidation, activated carbon adsorption, and membrane separation. However, each technology has the following shortcomings: While ozone oxidation can effectively degrade odor substances, it has limited effect on PFAS removal, and traditional fixed aeration methods are prone to uneven ozone distribution and low utilization rate. Activated carbon adsorption is not efficient for low-concentration pollutants, requires a large dosage, and the PFAS enriched in waste carbon sludge poses a risk of secondary pollution. Membrane separation technology has a high PFAS rejection rate, but membrane materials such as PVDF may release PFAS themselves, and concentrated wastewater treatment is difficult.

[0004] Therefore, there is an urgent need to develop an integrated and intelligent collaborative processing system to achieve efficient removal of odor substances and PFAS, and to harmlessly dispose of byproducts. Summary of the Invention

[0005] The purpose of this invention is to provide a treatment system and method for synergistically removing odorous substances and new pollutants PFAS from water, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a treatment system for synergistic removal of odorous substances and new pollutants PFAS in water, comprising a pre-oxidation unit, an algae removal adsorption and clarification unit, a membrane separation and concentration unit, and a destruction unit connected in sequence; The pre-oxidation unit includes an ozone generating mechanism and an oxidation tank. The oxidation tank is equipped with a dynamic aeration component that can move laterally back and forth to improve the contact efficiency between ozone and water. The algae removal adsorption and clarification unit includes a tank, a vacuum chamber, a pulse generator, a flow stabilizer, a suspended carbon sludge bed, an outlet tank, and a lifting mechanism, which are used to enhance the adsorption contact between carbon sludge and pollutants through pulsed water flow. The membrane separation and concentration unit includes a filter membrane made of modified polyethersulfone, which is fluorine-free. The filter membrane has a tapered structure at both ends and is equipped with an online cleaning mechanism. The destruction unit includes a carbon sludge concentration and dewatering system, a mixing and feeding system, a high-temperature incineration system, and a flue gas purification system, which are used to synergistically incinerate the membrane separation concentrate and waste carbon sludge at high temperatures.

[0007] Preferably, the dynamic aeration assembly includes two pairs of upper slide rails, two pairs of lower slide rails, and an aeration pipe array. The inner side of the lower slide rail is slidably connected to a lower rack, and the inner side of the upper slide rail is slidably connected to an upper rack that is fixedly connected to the lower rack. The aeration pipe array is fixedly connected between the two lower racks, and the aeration pipe array is connected to the output end of the ozone generator through a pipe. The inner wall of the oxidation tank is provided with a hydraulic drive mechanism, which is used to drive the aeration pipe array to perform transverse reciprocating motion.

[0008] Preferably, the hydraulic drive mechanism includes a central rod, a propeller blade, and two drive rings. The central rod is rotatably connected to the inner wall of the oxidation tank, the propeller blade is fixedly connected to the outer side of the central rod and is located inside the inlet of the oxidation tank, the two drive rings are fixedly connected to the outer side of the central rod, and half of the outer surface of the drive rings is provided with teeth, and both the upper and lower racks can mesh with the teeth on the surface of the drive rings.

[0009] Preferably, the vacuum chamber is located at the bottom of the tank, the pulse generator is installed at the bottom of the vacuum chamber, the side of the vacuum chamber is connected to the output end of the oxidation tank through a dosing pipe, the flow stabilizer, the suspended carbon sludge bed and the effluent trough are respectively installed inside the tank from bottom to top, the lifting mechanism is used to adjust the vertical height of the suspended carbon sludge bed, and the side of the tank is provided with a sludge discharge mechanism for discharging the carbon sludge deposited in the suspended carbon sludge bed.

[0010] Preferably, the membrane separation and concentration unit further includes an inlet water tank, a security filter, an explosion-proof housing, a product water tank, and a concentrate tank. The inlet water tank, the security filter, and the explosion-proof housing are connected in sequence. The inlet water tank is connected to the outlet water tank through a water pumping pipe. The filter membrane is disposed inside the explosion-proof housing. The product water tank is connected to the outside of the explosion-proof housing to collect the water filtered by the filter membrane. The concentrate tank is connected to the end of the explosion-proof housing to collect the concentrate discharged from the filter membrane outlet.

[0011] Preferably, a booster pump and a pH adjustment device are installed on the pipeline between the security filter and the explosion-proof housing to pressurize and adjust the pH of the raw water entering the filter membrane.

[0012] Preferably, the online cleaning mechanism includes a cleaning agent tank, a control valve, a cleaning pump, and an output pipeline. The lower end of the cleaning agent tank is fixedly connected to the input end of the cleaning pump through the pipeline, and a control valve is provided on the pipeline. One end of the output pipeline is connected to the output end of the cleaning pump, and the other end of the output pipeline is fixedly connected to the inner cavity of the explosion-proof housing.

[0013] Preferably, the input end of the carbon sludge thickening and dewatering system is connected to the output end of the sludge discharge mechanism, the two feed ports of the mixing and feeding system are respectively connected to the output end of the carbon sludge thickening and dewatering system and the output end of the concentrated water tank, the high-temperature incineration system is used to incinerate the material discharged from the mixing and feeding system, and the flue gas purification system is used to purify the discharged flue gas.

[0014] Preferably, the algae removal adsorption and clarification unit further includes a dosing device, which is installed on the dosing pipeline.

[0015] A treatment method based on the treatment system for synergistic removal of odor substances and new pollutants PFAS in water according to any one of claims 1-9 includes the following steps: S1, pre-oxidation treatment: raw water enters the ozone pre-oxidation unit, where ozone is evenly distributed through dynamic aeration components to oxidize and decompose 2-MIB, GSM and some PFAS. S2, adsorption clarification treatment, pre-oxidized effluent enters the tank, and the pulsed water flow generated by the pulse generator causes the suspended carbon sludge bed to expand and contract periodically, enhancing the adsorption contact between the carbon sludge and pollutants, and removing residual odor substances and some PFAS. S3, Membrane separation and concentration treatment: the clarified effluent discharged from the effluent tank enters the membrane separation and concentration unit, where a modified polyethersulfone filter membrane is used to efficiently retain PFAS. The produced water meets the discharge standards or is reused, while the concentrated water enters the destruction unit. S4, co-incineration treatment, dehydrates the waste carbon sludge discharged from the sludge discharge mechanism through the carbon sludge concentration and dewatering system, and then forcibly mixes it with the concentrated water discharged from the concentrated water tank in the mixing and feeding system to form a homogeneous slurry, which is then sent to the high-temperature incineration system to completely decompose PFAS at ≥900℃. The flue gas is then purified by the flue gas purification system and discharged in compliance with standards.

[0016] Beneficial effects This invention provides a treatment system for the synergistic removal of odor-causing substances and new pollutants PFAS from water, which has the following beneficial effects: 1. This treatment system for the synergistic removal of odor-causing substances and emerging pollutants (PFAS) from water organically integrates a pre-oxidation unit, an algae removal and adsorption clarification unit, a membrane separation and concentration unit, and a destruction unit, constructing a complete treatment chain. The system first utilizes ozone oxidation to remove odor-causing substances, then uses adsorption and membrane separation to synergistically retain PFAS, and finally incinerates the pollutants for complete destruction. This design solves the problem that single technologies (such as simple oxidation or adsorption) cannot simultaneously and efficiently remove odor-causing substances and PFAS, achieving comprehensive, multi-stage pollutant control from water to solid waste.

[0017] 2. This treatment system, which synergistically removes odor-causing substances and emerging pollutants (PFAS) from water, cleverly utilizes a unique hydraulic drive mechanism to propel the aeration tube array in a lateral reciprocating motion, replacing traditional fixed aeration. This design requires no additional electricity, achieving "water-driven aeration" and resulting in significant energy savings. Simultaneously, dynamic aeration ensures more uniform distribution and longer paths of ozone bubbles in the water, greatly improving ozone mass transfer efficiency and utilization, thereby enhancing the oxidative decomposition of odor-causing substances and reducing the required ozone dosage.

[0018] 3. This treatment system, which synergistically removes odor-causing substances and new pollutants (PFAS) from water, utilizes a pulse generator at the bottom of the tank to create periodic pulses in the water, driving the suspended activated carbon sludge bed to expand and contract rhythmically. This dynamic fluidization state significantly increases the contact probability and mass transfer driving force between the activated carbon sludge and pollutants, resulting in higher adsorption efficiency and more thorough contact compared to traditional fixed-bed or mechanically stirred adsorption. Simultaneously, the design of the flow stabilizing plate ensures uniform water distribution and guarantees the stability of the adsorption process.

[0019] 4. This treatment system, which synergistically removes odor-causing substances and new PFAS contaminants from water, uses modified polyethersulfone (PES) as the filter membrane material. It is fluorine-free, fundamentally eliminating the risk of secondary pollution caused by the leaching of PFAS into the water from traditional fluorinated membranes (such as PVDF). The tapered end design of the filter membrane optimizes hydraulic conditions and reduces contaminant accumulation at the membrane tip. The accompanying online cleaning mechanism enables in-situ, periodic cleaning of the filter membrane, effectively preventing membrane fouling, extending membrane life, and ensuring the long-term stable operation of the membrane separation and concentration unit and the efficient retention of PFAS. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a treatment system for synergistically removing odor substances and new pollutants PFAS from water, as proposed in this invention. Figure 2 This is a schematic diagram of the pre-oxidation unit structure of a treatment system for synergistic removal of odor substances and new pollutants PFAS from water, as proposed in this invention. Figure 3 This is a three-dimensional structural diagram of the dynamic aeration component of a treatment system for synergistically removing odorous substances and new pollutants PFAS from water, as proposed in this invention. Figure 4 This is a schematic diagram of the lower and upper racks of a treatment system for synergistically removing odor substances and new pollutants PFAS from water, as proposed in this invention. Figure 5 This is a schematic diagram of the algae removal, adsorption, and clarification unit structure of a treatment system for synergistic removal of odorous substances and new pollutants PFAS in water, as proposed in this invention. Figure 6 This is a schematic diagram of the membrane separation and concentration unit structure of a treatment system for synergistic removal of odorous substances and new pollutants PFAS from water, as proposed in this invention. Figure 7 This is a schematic diagram of the destructive unit structure of a treatment system for synergistically removing odorous substances and new pollutants PFAS from water, as proposed in this invention.

[0021] In the diagram: 1. Pre-oxidation unit; 2. Algae removal, adsorption, and clarification unit; 3. Membrane separation and concentration unit; 4. Destruction unit; 5. Ozone generator; 6. Oxidation tank; 7. Dynamic aeration assembly; 8. Tank body; 9. Vacuum chamber; 10. Pulse generator; 11. Flow stabilizer; 12. Suspended sludge bed; 13. Effluent tank; 14. Filter membrane; 15. Online cleaning mechanism; 16. Sludge concentration and dewatering system; 17. Mixing and feeding system; 18. High-temperature incineration system; 19. Flue gas purification system; 20. Upper slide rail; 21. Lower slide rail; 22. Aeration tube array; 23. Lower rack; 24. Upper rack; 25. Center rod; 26. Propeller blade; 27. Drive ring; 28. Dosing pipeline; 29. ​​Sludge discharge mechanism; 30. Inlet tank; 31. Security filter; 32. Explosion-proof housing; 33. Product water tank; 34. Concentrate tank; 35. Cleaning agent tank; 36. Control valve; 37. Cleaning pump; 38. Output pipeline; 39. Dosing device. Detailed Implementation

[0022] 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.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example 1, please refer to Figure 1-7 The present invention provides a technical solution: a treatment system for synergistically removing odor substances and new pollutants PFAS from water, comprising a pre-oxidation unit 1, an algae removal adsorption and clarification unit 2, a membrane separation and concentration unit 3, and a destruction unit 4 connected in sequence; The pre-oxidation unit 1 includes an ozone generating mechanism 5 and an oxidation tank 6. The oxidation tank 6 is equipped with a dynamic aeration component 7 that can move laterally back and forth to improve the contact efficiency between ozone and water. The algae removal adsorption and clarification unit 2 includes a tank body 8, a vacuum chamber 9, a pulse generator 10, a flow stabilizer 11, a suspended carbon sludge bed 12, an outlet tank 13, and a lifting mechanism, which are used to enhance the adsorption contact between carbon sludge and pollutants through pulsed water flow. The membrane separation and concentration unit 3 includes a filter membrane 14, which is made of modified polyethersulfone and does not contain fluorine. The filter membrane 14 has a tapered structure at both ends and is equipped with an online cleaning mechanism 15. The destruction unit 4 includes a carbon sludge concentration and dewatering system 16, a mixing and feeding system 17, a high-temperature incineration system 18, and a flue gas purification system 19, which are used to co-process the membrane separation concentrate and waste carbon sludge through high-temperature incineration. The high-temperature incineration system 18 has an incineration temperature of ≥900℃, and the mixing and feeding system 17 has a built-in agitator.

[0027] The dynamic aeration component 7 includes two pairs of upper slide rails 20, two pairs of lower slide rails 21, and an aeration tube array 22. The inner side of the lower slide rail 21 is slidably connected to a lower rack 23, and the inner side of the upper slide rail 20 is slidably connected to an upper rack 24 that is fixedly connected to the lower rack 23. The aeration tube array 22 is fixedly connected between the two lower racks 23, and the aeration tube array 22 is connected to the output end of the ozone generator 5 through a pipe. The inner wall of the oxidation tank 6 is provided with a hydraulic drive mechanism, which is used to drive the aeration tube array 22 to perform transverse reciprocating motion.

[0028] The hydraulic drive mechanism includes a central rod 25, a propeller blade 26, and a drive ring 27. The central rod 25 is rotatably connected to the inner wall of the oxidation tank 6. The propeller blade 26 is fixedly connected to the outside of the central rod 25 and is located inside the inlet of the oxidation tank 6. Two drive rings 27 are fixedly connected to the outside of the central rod 25, and half of the outer surface of the drive ring 27 is provided with teeth. The upper rack 24 and the lower rack 23 can both mesh with the teeth on the surface of the drive ring 27. By setting up a hydraulic drive mechanism, the propeller blades 26 are rotated by the impact of raw water. The rotation of the propeller blades 26 and the central rod 25 can drive the drive ring 27 to rotate. The drive ring 27 meshes with the lower rack 23, which can slide laterally in the lower slide rail 21. The drive ring 27 meshes with the upper rack 24, which can slide laterally in the upper slide rail 20. The lateral sliding of the upper rack 24 and the lower rack 23 can drive the aeration tube array 22 to reciprocate laterally. Ozone is delivered to the aeration tube array 22 through the ozone generating mechanism 5. With the lateral reciprocating motion of the aeration tube array 22, the contact efficiency between ozone and water in the oxidation tank 6 can be effectively improved.

[0029] Vacuum chamber 9 is located at the bottom of tank body 8. Pulse generator 10 is installed at the bottom of vacuum chamber 9. The side of vacuum chamber 9 is connected to the output end of oxidation tank 6 through dosing pipe 28. Flow stabilizer 11, suspended carbon mud bed 12 and effluent trough 13 are respectively installed inside tank body 8 from bottom to top. Flow stabilizer 11 has multiple equally spaced strip holes on its surface. The narrow strip holes can provide a larger flow area and are less prone to clogging. At the same time, flow stabilizer 11 can dissipate the kinetic energy of water flow, making the water distribution more uniform, so that the water flow can flow upward smoothly.

[0030] The water in the vacuum chamber 9 is periodically pumped upwards in pulses by the pulse generator 10. After passing through the flow stabilizer 11, the water flows evenly into the area where the suspended carbon sludge bed 12 is located. Under the action of the pulsed water flow, the activated carbon layer in the suspended carbon sludge bed 12 periodically expands and contracts, enhancing the contact and collision between the carbon sludge and pollutants, and improving the adsorption and retention efficiency. The clarified water flows upwards and eventually enters the effluent tank 13, while the adsorbed saturated carbon sludge is deposited at the bottom of the suspended carbon sludge bed 12 and periodically pumped out by the sludge discharge mechanism 29 for subsequent treatment.

[0031] The lifting mechanism is used to adjust the vertical height of the suspended carbon mud bed 12. A sludge discharge mechanism 29 is provided on the side of the tank body 8. The sludge discharge mechanism 29 is used to discharge the carbon mud deposited in the suspended carbon mud bed 12.

[0032] By combining pulsed water distribution with suspended carbon sludge bed 12, the contact efficiency between pollutants and adsorption media is enhanced, thereby improving the pollutant removal effect.

[0033] The membrane separation and concentration unit 3 also includes an inlet water tank 30, a security filter 31, an explosion-proof housing 32, a product water tank 33, and a concentrate tank 34. The inlet water tank 30, the security filter 31, and the explosion-proof housing 32 are connected in sequence. The inlet water tank 30 is connected to the outlet water tank 13 through a water pumping pipe. The filter membrane 14 is installed inside the explosion-proof housing 32. The product water tank 33 is connected to the outside of the explosion-proof housing 32 to collect the water filtered by the filter membrane 14. The concentrate tank 34 is connected to the end of the explosion-proof housing 32 to collect the concentrate discharged from the outlet of the filter membrane 14.

[0034] By setting up a modified polyethersulfone filter membrane 14, the membrane material is prevented from becoming a secondary source of PFAS pollution at the source.

[0035] A booster pump and a pH adjustment device are installed on the pipeline between the security filter 31 and the explosion-proof housing 32 to pressurize and adjust the pH of the raw water entering the filter membrane 14.

[0036] The security filter 31 can be used to remove particulate matter from the influent. The pH adjustment device is used to adjust the pH value of the flowing sewage. In actual operation, the sewage pH value needs to be adjusted to 6-8 to optimize the operating conditions of the filter membrane 14. The sewage can be pressurized and transported into the inner side of the filter membrane 14 by the booster pump, thereby realizing internal pressure cross-flow filtration.

[0037] The input end of the charcoal sludge thickening and dewatering system 16 is connected to the output end of the sludge discharge mechanism 29. The two feed ports of the mixing and feeding system 17 are respectively connected to the output end of the charcoal sludge thickening and dewatering system 16 and the output end of the concentrated water tank 34. The high-temperature incineration system 18 is used to incinerate the material discharged from the mixing and feeding system 17, and the flue gas purification system 19 is used to purify the discharged flue gas.

[0038] The algae removal adsorption and clarification unit 2 also includes a dosing device 39, which is installed on the dosing pipe 28. The dosing device 39 can be used to add coagulants (such as polyaluminum chloride, ferric chloride), powdered activated carbon and flocculants (such as PAM) into the dosing pipe 28.

[0039] Example 2, please refer to Figure 6 Including Embodiment 1, and based on Embodiment 1, the present invention provides a technical solution: the online cleaning mechanism 15 includes a cleaning agent tank 35, a control valve 36, a cleaning pump 37 and an output pipeline 38. The lower end of the cleaning agent tank 35 is fixedly connected to the input end of the cleaning pump 37 through the pipeline, and the control valve 36 is provided on the pipeline. One end of the output pipeline 38 is connected to the output end of the cleaning pump 37, and the other end of the output pipeline 38 is fixedly connected to the inner cavity of the explosion-proof housing 32.

[0040] By setting up an online cleaning mechanism 15, and using the cooperation of control valve 36 and cleaning pump 37, the cleaning agent in the cleaning agent tank 35 can be delivered from the output pipeline 38 to the explosion-proof housing 32. When cleaning the filter membrane 14, the valve at the inlet of the product water tank 33 needs to be closed. By performing reverse cleaning and chemical cleaning on the filter membrane 14, clogging of the filter membrane 14 is effectively avoided. Moreover, the cleaning process does not require disassembling the filter membrane 14, thereby extending the service life of the filter membrane 14.

[0041] A treatment method for a system that synergistically removes odor-causing substances and emerging pollutants (PFAS) from water includes the following steps: S1, pre-oxidation treatment: raw water enters ozone pre-oxidation unit 1, and ozone is evenly distributed through dynamic aeration component 7 to oxidize and decompose 2-MIB, GSM and some PFAS. S2, adsorption clarification treatment, pre-oxidized effluent enters tank 8, the pulse water flow generated by pulse generator 10 causes the suspended carbon mud bed 12 to periodically expand and contract, enhance the adsorption contact between carbon mud and pollutants, and remove residual odor substances and some PFAS. S3, Membrane separation and concentration treatment: the clarified effluent discharged from the effluent tank 13 enters the membrane separation and concentration unit 3, where the modified polyethersulfone filter membrane 14 efficiently intercepts the PFAS, and the produced water meets the discharge standards or is reused, while the concentrated water enters the destruction unit 4. S4, co-incineration treatment, the waste carbon sludge discharged from the sludge discharge mechanism 29 is dehydrated by the carbon sludge concentration and dewatering system 16 and then forcibly stirred with the concentrated water discharged from the concentrated water tank 34 in the mixing and feeding system 17 to form a homogeneous slurry, which is then sent to the high-temperature incineration system 18 to completely decompose PFAS at ≥900℃. The flue gas is purified by the flue gas purification system 19 and then discharged in compliance with standards.

[0042] The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments of this disclosure. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 treatment system for synergistically removing odor-causing substances and new pollutants PFAS from water, characterized in that, It includes a pre-oxidation unit (1), an algae removal adsorption and clarification unit (2), a membrane separation and concentration unit (3), and a destruction unit (4) connected in sequence. The pre-oxidation unit (1) includes an ozone generating mechanism (5) and an oxidation tank (6). The oxidation tank (6) is equipped with a dynamic aeration component (7) that can move laterally back and forth, which is used to improve the contact efficiency between ozone and water. The algae removal adsorption clarification unit (2) includes a tank body (8), a vacuum chamber (9), a pulse generator (10), a flow stabilizer (11), a suspended carbon mud bed (12), an outlet tank (13), and a lifting mechanism, which are used to enhance the adsorption contact between carbon mud and pollutants through pulse water flow. The membrane separation and concentration unit (3) includes a filter membrane (14), which is made of modified polyethersulfone and does not contain fluorine. The filter membrane (14) has a conical structure at both ends and is equipped with an online cleaning mechanism (15). The destruction unit (4) includes a carbon sludge concentration and dewatering system (16), a mixing and feeding system (17), a high-temperature incineration system (18), and a flue gas purification system (19), which are used to synergistically incinerate the membrane separation concentrate and waste carbon sludge.

2. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 1, characterized in that: The dynamic aeration component (7) includes two pairs of upper slide rails (20), two pairs of lower slide rails (21), and an aeration tube array (22). The lower slide rail (21) is slidably connected to a lower rack (23), and the upper slide rail (20) is slidably connected to an upper rack (24) fixedly connected to the lower rack (23). The aeration tube array (22) is fixedly connected between the two lower racks (23), and the aeration tube array (22) is connected to the output end of the ozone generator (5) through a pipe. The inner wall of the oxidation tank (6) is provided with a hydraulic drive mechanism, which is used to drive the aeration tube array (22) to perform transverse reciprocating motion.

3. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 2, characterized in that: The hydraulic drive mechanism includes a central rod (25), a propeller blade (26), and two drive rings (27). The central rod (25) is rotatably connected to the inner wall of the oxidation tank (6). The propeller blade (26) is fixedly connected to the outside of the central rod (25) and is located inside the inlet of the oxidation tank (6). The two drive rings (27) are fixedly connected to the outside of the central rod (25), and half of the outer surface of the drive ring (27) is provided with teeth. The upper rack (24) and the lower rack (23) can both mesh with the teeth on the surface of the drive ring (27).

4. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 1, characterized in that: The vacuum chamber (9) is located at the bottom of the tank body (8). The pulse generator (10) is set at the bottom of the vacuum chamber (9). The side of the vacuum chamber (9) is connected to the output end of the oxidation tank (6) through the dosing pipe (28). The flow stabilizer (11), the suspended carbon mud bed (12) and the effluent trough (13) are respectively set inside the tank body (8) from bottom to top. The lifting mechanism is used to adjust the vertical height of the suspended carbon mud bed (12). The side of the tank body (8) is provided with a sludge discharge mechanism (29). The sludge discharge mechanism (29) is used to discharge the carbon mud deposited in the suspended carbon mud bed (12).

5. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 4, characterized in that: The membrane separation and concentration unit (3) further includes an inlet tank (30), a security filter (31), an explosion-proof housing (32), a product water tank (33), and a concentrate tank (34). The inlet tank (30), the security filter (31), and the explosion-proof housing (32) are connected in sequence. The inlet tank (30) is connected to the outlet tank (13) through a water pumping pipe. The filter membrane (14) is installed inside the explosion-proof housing (32). The product water tank (33) is connected to the outside of the explosion-proof housing (32) to collect the water filtered by the filter membrane (14). The concentrate tank (34) is connected to the end of the explosion-proof housing (32) to collect the concentrate discharged from the outlet of the filter membrane (14).

6. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 5, characterized in that: A booster pump and a pH adjustment device are installed on the pipeline between the security filter (31) and the explosion-proof housing (32) to pressurize and adjust the pH of the raw water entering the filter membrane (14).

7. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 1, characterized in that: The online cleaning mechanism (15) includes a cleaning agent tank (35), a control valve (36), a cleaning pump (37), and an output pipeline (38). The lower end of the cleaning agent tank (35) is fixedly connected to the input end of the cleaning pump (37) through the pipeline, and a control valve (36) is provided on the pipeline. One end of the output pipeline (38) is connected to the output end of the cleaning pump (37), and the other end of the output pipeline (38) is fixedly connected to the inner cavity of the explosion-proof housing (32).

8. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 5, characterized in that: The input end of the carbon mud thickening and dewatering system (16) is connected to the output end of the mud discharge mechanism (29). The two feed ports of the mixing feed system (17) are respectively connected to the output end of the carbon mud thickening and dewatering system (16) and the output end of the concentrated water tank (34). The high temperature incineration system (18) is used to incinerate the material discharged from the mixing feed system (17). The flue gas purification system (19) is used to purify the discharged flue gas.

9. The treatment system for synergistic removal of odor substances and new pollutants PFAS from water according to claim 4, characterized in that: The algae removal adsorption and clarification unit (2) also includes a dosing device (39), which is installed on the dosing pipe (28).

10. A treatment method based on the treatment system for synergistic removal of odor substances and new pollutants PFAS in water according to any one of claims 1-9, characterized in that, Includes the following steps: S1, pre-oxidation treatment: raw water enters the ozone pre-oxidation unit (1), and ozone is evenly distributed through the dynamic aeration component (7) to oxidize and decompose 2-MIB, GSM and some PFAS. S2, adsorption clarification treatment, pre-oxidized effluent enters the tank (8), the pulse water flow generated by the pulse generator (10) causes the suspended carbon mud bed (12) to periodically expand and contract, enhance the adsorption contact between carbon mud and pollutants, and remove residual odor substances and some PFAS. S3, Membrane separation and concentration treatment, the clarified effluent discharged from the effluent tank (13) enters the membrane separation and concentration unit (3), and the modified polyethersulfone filter membrane (14) is used to efficiently intercept PFAS, the produced water meets the discharge standards or is reused, and the concentrated water enters the destruction unit (4). S4, co-incineration treatment, the waste carbon sludge discharged from the sludge discharge mechanism (29) is dehydrated by the carbon sludge concentration and dewatering system (16) and then forcibly stirred with the concentrated water discharged from the concentrated water tank (34) in the mixing and feeding system (17) to form a homogeneous slurry, which is then sent to the high-temperature incineration system (18) to completely decompose PFAS at ≥900℃. The flue gas is purified by the flue gas purification system (19) and then discharged in compliance with standards.

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