A printing and dyeing wastewater treatment device integrated with heterogeneous fenton-like catalytic oxidation technology

Abstract

The utility model belongs to wastewater treatment technical field discloses a kind of printing and dyeing wastewater treatment device of integrated heterogeneous fenton catalytic oxidation technology, comprising: fluidized bed reactor, fluidized bed reactor bottom uses cyclone water distributor structure;Micro electrolytic tower, micro electrolytic tower is arranged inside fluidized bed reactor, and micro electrolytic tower is filled with iron-carbon composite filler inside, and ultrasonic auxiliary system is also installed in fluidized bed reactor;Adjusting pool, on-line monitoring instrument is installed in adjusting pool, and water inlet pump is arranged between adjusting pool and fluidized bed reactor, and water inlet pump two ends are respectively with adjusting pool and fluidized bed reactor intercommunication;Oxidant dosing pool, oxidant dosing pool includes inclined plate sedimentation tank, and first water delivery pipe is interconnected between fluidized bed reactor and oxidant dosing pool.The utility model can solve the mass transfer efficiency, catalyst recovery and multistage treatment coordination problem of heterogeneous fenton technology in industrial application by multiple unit synergistic effect.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a dyeing and printing wastewater treatment device that integrates heterogeneous Fenton catalytic oxidation technology. Background Technology

[0002] Traditional homogeneous Fenton technology relies on the addition of large amounts of iron salts and hydrogen peroxide, leading to significant secondary pollution problems from iron sludge, and has a narrow applicable pH range (only suitable for strongly acidic conditions of 2-4). While heterogeneous Fenton technologies reduce iron sludge production by immobilizing catalysts (such as metal oxides and supported composite materials), they still face core challenges such as easy catalyst loss, insufficient solid-liquid mass transfer efficiency, and slow reaction kinetics.

[0003] Traditional homogeneous systems use soluble iron salts (such as Fe) 2+ As a catalytic active center, it presents challenges such as difficult catalyst recovery and high sludge production (per 1 m³ treated). 3 The heterogeneous system has drawbacks such as generating 0.5-1 kg of iron sludge from wastewater and high costs for acid-base adjustment. Although the heterogeneous system improves the above problems through carrier immobilization technology, existing devices generally suffer from defects such as low catalyst-wastewater contact efficiency (insufficient effective mass transfer area), uneven flow field distribution, and weak dynamic control of reaction conditions, resulting in large fluctuations in COD removal rate (usually below 60%) in actual engineering applications.

[0004] The composition of dyeing and printing wastewater is complex (containing azo dyes, PVA sizing agents, surfactants, and other recalcitrant organic matter), requiring multi-process synergistic treatment. However, existing equipment suffers from low integration (unit equipment operates independently) and large footprint (traditional processes require 300-500m²). 2 / 10,000 m 3 ·d -1 Problems such as insufficient automation levels make it difficult to meet the needs of continuous industrial operation. Utility Model Content

[0005] The purpose of this invention is to provide a wastewater treatment device for printing and dyeing that integrates heterogeneous Fenton-like catalytic oxidation technology. This device can solve the problems of mass transfer efficiency, catalyst recovery, and multi-stage treatment synergy in the industrial application of heterogeneous Fenton-like technology through the synergistic effect of multiple units.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A wastewater treatment device for printing and dyeing products integrating heterogeneous Fenton-like catalytic oxidation technology includes:

[0008] A fluidized bed reactor, wherein the bottom of the fluidized bed reactor adopts a vortex water distributor structure;

[0009] A micro-electrolysis tower is installed inside a fluidized bed reactor. The micro-electrolysis tower is filled with iron-carbon composite packing material. An ultrasonic-assisted system is also installed inside the fluidized bed reactor.

[0010] An equalization tank is provided, in which an online monitoring instrument is installed. An inlet pump is provided between the equalization tank and the fluidized bed reactor, and the two ends of the inlet pump are respectively connected to the equalization tank and the fluidized bed reactor.

[0011] An oxidant addition tank, comprising an inclined plate sedimentation tank, wherein a first water supply pipe connects the fluidized bed reactor to the oxidant addition tank;

[0012] The system includes a clear water tank and a biological filter, which are interconnected. A second water supply pipe connects the fluidized bed reactor to the biological filter. A metering pump is installed on the side wall of the oxidant dosing tank, and a third water supply pipe is fixedly connected to the output end of the metering pump. The third water supply pipe is connected to the clear water tank.

[0013] A flow sensor is installed on the side wall of the first water delivery pipe.

[0014] Multiple triangular plates are fixedly connected to the bottom surface of the inner cavity of the oxidant addition tank. The area between adjacent triangular plates is a sludge settling zone. A sealing component is also provided on the side wall of the triangular plate. A sludge discharge component is provided in the sludge settling zone.

[0015] The sealing assembly includes a baffle plate disposed on the inclined surface of a triangular plate. A rotating shaft is fixedly connected to the side wall of the baffle plate. The other end of the rotating shaft is rotatably connected to the inner wall of the oxidant addition tank. When two adjacent baffle plates are flipped to a horizontal state, they are used to reduce the amount of water flowing into the sludge sedimentation zone. A transmission assembly is provided on the side wall of the rotating shaft.

[0016] The transmission assembly includes a gear fixedly connected to the side wall of the rotating shaft, a rack meshing with the lower side of the gear, the rack passing through and movably connected to a triangular plate, a mounting plate fixedly connected to the inner side wall of the triangular plate, an electric push rod mounted on the side wall of the mounting plate, and the output end of the electric push rod fixedly connected to the rack.

[0017] Each baffle end face is fixedly connected with a sealing ring.

[0018] The sludge discharge assembly includes a sludge discharge pipe installed in the sludge sedimentation zone. The other end of the sludge discharge pipe passes through the oxidant addition tank. Several through holes are opened on the side wall of the sludge discharge pipe, and a control valve is installed on the side wall of the sludge discharge pipe.

[0019] The technical effects achieved by this utility model are as follows:

[0020] This invention relates to a dyeing and printing wastewater treatment device integrating heterogeneous Fenton catalytic oxidation technology. The heterogeneous catalyst activity is 50% higher than that of the traditional homogeneous Fenton catalyst, and the H2O2 utilization rate reaches over 80%. The ultrasonic-assisted system effectively inhibits catalyst deactivation, and the device can operate continuously and stably for ≥6 months (without needing to stop for regeneration).

[0021] This utility model discloses a dyeing and printing wastewater treatment device integrating heterogeneous Fenton catalytic oxidation technology. The catalyst recycling rate is ≥95%, and sludge production is reduced by 70% compared to traditional processes. The integrated design reduces the floor space required by 30% compared to traditional "pretreatment + Fenton + biochemical" systems (saving 100-150m² for the same treatment capacity). 2 ).

[0022] This utility model discloses a dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology. Through the cooperation between the oxidant addition tank, sludge sedimentation zone and baffle, after the settled sludge is discharged to a certain extent, the baffle can be flipped to a horizontal state to block the sludge sedimentation zone, reduce the flow rate of water entering the sludge sedimentation zone, and use a small flow rate to assist in flushing and discharging the sludge. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a perspective view of the oxidant addition tank of this utility model;

[0025] Figure 3 This is a cross-sectional structural schematic diagram of the oxidant addition tank of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the baffle of this utility model;

[0027] Figure 5 This is a schematic diagram of the transmission component of this utility model;

[0028] Figure 6 This is a schematic diagram of the sludge discharge assembly of this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Fluidized bed reactor; 2. Micro-electrolysis tower; 3. Equalization tank; 4. Ultrasonic-assisted system; 5. Oxidant dosing tank; 6. Clear water tank; 7. Biological filter; 8. Inclined plate sedimentation tank; 9. Metering pump; 10. Inlet pump; 11. First water supply pipe; 12. Second water supply pipe; 13. Third water supply pipe; 14. Flow sensor; 15. Triangular plate; 16. Sludge settling zone; 17. Baffle; 18. Rotating shaft; 19. Gear; 20. Rack; 21. Mounting plate; 22. Electric actuator; 23. Sealing ring; 24. Sludge discharge pipe; 25. Through hole; 26. Control valve. Detailed Implementation

[0031] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0032] Example 1:

[0033] like Figure 1 As shown, a dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology includes:

[0034] Fluidized bed reactor 1 adopts a swirl water distributor structure at the bottom; the turbulent contact efficiency between wastewater and catalyst is enhanced by the guide cone and spiral flow channel (mass transfer coefficient is increased by 30%); it is filled with core-shell structure magnetic F&aQ4@C catalyst (particle size 0.5-1mm, specific surface area >200m2 / g), which has both high catalytic activity and magnetic separation recovery characteristics.

[0035] Micro-electrolysis tower 2 is installed inside the fluidized bed reactor 1. The micro-electrolysis tower 2 is filled with iron-carbon composite packing (Fe / C volume ratio 1:1). The wastewater retention time is 20-30 min. Pollutants are pre-oxidized through electrochemical reaction, which improves the biodegradability of wastewater (B / C ratio can be increased by 0.1-0.2). The fluidized bed reactor 1 is also equipped with an ultrasonic auxiliary system 4. The inner wall of the reactor is integrated with a high-frequency ultrasonic transducer (40kHz, intermittent start and stop) to prevent catalyst agglomeration and maintain a stable solid-liquid suspension state through cavitation effect.

[0036] Equalization tank 3 is equipped with an online pH / ORP monitor, which is linked to the acid-base dosing system (HSO₄ / NaOH) to adjust the pH of the wastewater to the optimal reaction range of 3-5 in real time. An inlet pump 10 is installed between equalization tank 3 and fluidized bed reactor 1, with both ends of the inlet pump 10 connected to equalization tank 3 and fluidized bed reactor 1 respectively.

[0037] Oxidant addition tank 5 includes inclined plate sedimentation tank 8. A first water supply pipe 11 connects the fluidized bed reactor 1 and oxidant addition tank 5. PAM flocculant (concentration 1-3 mg / L) is added to the inclined plate sedimentation tank 8 to further remove suspended solids in the wastewater (removal rate >85%).

[0038] Clear water tank 6 and biological filter 7 are interconnected. A second water supply pipe 12 connects fluidized bed reactor 1 and biological filter 7. A metering pump 9 is installed on the side wall of oxidant dosing tank 5, and a third water supply pipe 13 is fixedly connected to the output end of metering pump 9, which is connected to clear water tank 6. Clear water tank 6 is equipped with an automatic pH adjustment system to adjust the pH of the effluent to 6-9, meeting the requirements of the "Water Pollutant Discharge Standard for Textile Dyeing and Finishing Industry" (GB4287-2012), allowing for direct discharge or reuse in the production process.

[0039] The biological filter 7 is filled with anaerobic-aerobic composite packing material (such as polyurethane sponge + ceramsite), which degrades residual small molecule organic matter through microbial metabolism (COD removal rate >30%).

[0040] A flow sensor 14 is installed on the side wall of the first water delivery pipe 11. The metering pump 9 and the flow sensor 14 are linked to control the dosage (control accuracy +2%).

[0041] Example 2:

[0042] Based on Example 1, this example makes the following additions to the oxidant addition tank 5:

[0043] like Figures 2-6 As shown, multiple triangular plates 15 are fixedly connected to the bottom surface of the inner cavity of the oxidant addition tank 5. The sludge sedimentation zone 16 formed by the triangular plates 15 is the prior art. The area between adjacent triangular plates 15 is the sludge sedimentation zone 16. The side wall of the triangular plates 15 is also provided with a sealing component. The sludge discharge component is provided in the sludge sedimentation zone 16.

[0044] The sealing assembly includes a baffle 17 set on the inclined surface of the triangular plate 15. A rotating shaft 18 is fixedly connected to the side wall of the baffle 17. The other end of the rotating shaft 18 is rotatably connected to the inner wall of the oxidant addition tank 5. When two adjacent baffles 17 are flipped to the horizontal state, they are used to reduce the amount of water flowing into the sludge sedimentation zone 16. A transmission assembly is provided on the side wall of the rotating shaft 18.

[0045] like Figure 5 As shown, the transmission assembly includes a gear 19 fixedly connected to the side wall of the rotating shaft 18, a rack 20 meshing with the lower side of the gear 19, the rack 20 passing through the triangular plate 15 and movably connected thereto, a mounting plate 21 fixedly connected to the inner side wall of the triangular plate 15, an electric push rod 22 mounted on the side wall of the mounting plate 21, and the output end of the electric push rod 22 fixedly connected to the rack 20.

[0046] Among them, the electric push rod 22 and other electrical components are all waterproofed to avoid damage caused by humid environments. After the settled sludge is discharged to a certain extent, the baffle 17 can be flipped to a horizontal position to block the sludge sedimentation zone 16, reducing the flow rate of water into the sludge sedimentation zone 16. A small flow rate can be used to assist in flushing and discharging the sludge, increasing the sludge discharge efficiency.

[0047] like Figure 5 As shown, sealing rings 23 are fixedly connected to the end faces of the baffles 17. The sealing rings 23 can increase the sealing between the baffles 17 and the oxidant addition tank 5, reducing the phenomenon of water inflow.

[0048] like Figure 6 As shown, the sludge discharge assembly includes a sludge discharge pipe 24 disposed within the sludge settling zone 16. The other end of the sludge discharge pipe 24 penetrates the oxidant dosing tank 5. Several through holes 25 are formed in the side wall of the sludge discharge pipe 24, and a control valve 26 is installed on the side wall of the sludge discharge pipe 24. The sludge discharge assembly is a mature existing technology and will not be described in detail in this solution. Furthermore, the control valve 26 can be selected as a manual or electric valve according to requirements.

[0049] When wastewater enters the oxidant addition tank 5, oxidants or flocculants are added to cause particulate matter and suspended solids in the wastewater to settle. Initial collection is performed using inclined plates, while other particulate matter settles in the sludge settling zone 16. When a significant amount of particulate matter accumulates on the inclined plates, it falls into the sludge settling zone 16. Once the sludge has settled to a certain extent, it is discharged through the sludge discharge pipe 24 using external equipment. When a small amount of sludge remains in the sludge settling zone 16, the electric push rod 22 is activated, moving the rack 20. The meshing gear 19 of bar 20 drives the rotating shaft 18 to rotate, and the rotating shaft 18 drives the baffle 17 to flip. When the baffles 17 on both sides flip to the horizontal state, the sealing rings 23 fit together, which plays an auxiliary sealing role. At this time, the sludge is extracted. The water in the oxidant addition tank 5 flows in from the gap between the baffle 17 and the oxidant addition tank 5 to wash the sludge remaining on the triangular plate 15 and quickly discharge it through the sludge discharge pipe 24. When the sludge is extracted, the electric push rod 22 drives the baffle 17 to reset.

[0050] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A wastewater treatment device for dyeing and printing wastewater integrating heterogeneous Fenton-like catalytic oxidation technology, characterized in that: include: Fluidized bed reactor (1), wherein the bottom of the fluidized bed reactor (1) adopts a vortex water distributor structure; Micro-electrolysis tower (2) is installed inside the fluidized bed reactor (1). The micro-electrolysis tower (2) is filled with iron-carbon composite packing material. An ultrasonic auxiliary system (4) is also installed inside the fluidized bed reactor (1). An equalization tank (3) is provided, an online monitoring instrument is installed in the equalization tank (3), and an inlet pump (10) is provided between the equalization tank (3) and the fluidized bed reactor (1). The two ends of the inlet pump (10) are connected to the equalization tank (3) and the fluidized bed reactor (1) respectively. Oxidizing agent addition tank (5), the oxidizing agent addition tank (5) includes inclined plate sedimentation tank (8), and the fluidized bed reactor (1) is connected to the oxidizing agent addition tank (5) by a first water supply pipe (11); The clear water tank (6) and the biological filter (7) are interconnected. A second water supply pipe (12) connects the fluidized bed reactor (1) and the biological filter (7). A metering pump (9) is installed on the side wall of the oxidant addition tank (5). A third water supply pipe (13) is fixedly connected to the output end of the metering pump (9). The third water supply pipe (13) is connected to the clear water tank (6).

2. The dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology according to claim 1, characterized in that: A flow sensor (14) is installed on the side wall of the first water delivery pipe (11).

3. The dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology according to claim 1, characterized in that: The bottom surface of the inner cavity of the oxidant addition tank (5) is fixedly connected with multiple triangular plates (15). The area between adjacent triangular plates (15) is a sludge sedimentation zone (16). The side wall of the triangular plate (15) is also provided with a sealing component. The sludge sedimentation zone (16) is provided with a sludge discharge component.

4. The dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology according to claim 3, characterized in that: The sealing assembly includes a baffle (17) set on the inclined surface of the triangular plate (15). A rotating shaft (18) is fixedly connected to the side wall of the baffle (17). The other end of the rotating shaft (18) is rotatably connected to the inner wall of the oxidant addition tank (5). When two adjacent baffles (17) are flipped to the horizontal state, they are used to reduce the amount of water flowing into the sludge sedimentation zone (16). A transmission assembly is provided on the side wall of the rotating shaft (18).

5. The dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology according to claim 4, characterized in that: The transmission assembly includes a gear (19) fixedly connected to the side wall of the rotating shaft (18), a rack (20) meshing with the lower side of the gear (19), the rack (20) passing through the triangular plate (15) and movably connected thereto, a mounting plate (21) fixedly connected to the inner side wall of the triangular plate (15), an electric push rod (22) mounted on the side wall of the mounting plate (21), and the output end of the electric push rod (22) fixedly connected to the rack (20).

6. The dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology according to claim 4, characterized in that: Each of the baffles (17) has a sealing ring (23) fixedly connected to its end face.

7. The dyeing and printing wastewater treatment device integrating heterogeneous Fenton-like catalytic oxidation technology according to claim 3, characterized in that: The sludge discharge assembly includes a sludge discharge pipe (24) disposed in the sludge sedimentation zone (16), the other end of the sludge discharge pipe (24) passing through the oxidant addition tank (5), the side wall of the sludge discharge pipe (24) having several through holes (25), and a control valve (26) installed on the side wall of the sludge discharge pipe (24).

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