A wastewater treatment system using a multi-metal composite Fenton catalyst

Abstract

This invention belongs to the field of wastewater treatment technology, and particularly relates to a wastewater treatment system using a multi-metal composite Fenton catalyst, comprising a two-stage catalytic-oxidation reaction tower and a multi-metal catalyst packing. The two-stage catalytic-oxidation reaction tower includes a catalytic reaction tower and an oxidation reaction tower. Both the catalytic reaction tower and the oxidation reaction tower are equipped with multi-layered multi-metal catalyst support plates. Multi-metal catalyst packing is filled above the support plates. An aeration and water distribution system is installed at the bottom of both the catalytic reaction tower and the oxidation reaction tower. The multi-metal catalyst packing is composed of several layers of plate-type packing monomers stacked sequentially. The surface of each plate-type packing monomer is loaded with an iron-manganese-carbon-silicon-nickel multi-metal active layer, forming a stable heterogeneous catalytic system. This invention solves the pain points of traditional Fenton processes, such as iron sludge pollution, pH limitation, and low mass transfer efficiency. It has completed pilot-scale verification in high-concentration organic wastewater treatment scenarios and has the potential for large-scale promotion.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a wastewater treatment system using a multi-metal composite Fenton catalyst. Background Technology

[0002] With the development of industry in my country, a large amount of industrial wastewater has been generated, and its pollution impact on the environment has become increasingly apparent. Among this, highly challenging wastewater, such as the large quantities of recalcitrant mixed wastewater from industries like chemical, pharmaceutical, and dyeing, contains many recalcitrant organic compounds and biotoxic substances. The organic composition is complex, and the chemical oxygen demand (COD) concentration is high, making this type of wastewater extremely difficult to treat. Environmentalists have been working tirelessly to address this difficult-to-treat, heavily polluted industrial wastewater. Currently, much research focuses on the traditional Fenton process, which uses catalytic oxidation technology. This process uses a catalyst to catalytically oxidize organic matter, thereby attacking various organic pollutants and microorganisms in the water until they are degraded. However, the traditional Fenton process often suffers from drawbacks such as iron sludge contamination, pH limitation, and low mass transfer efficiency. Therefore, designing a wastewater treatment system with low operating costs, stable treatment effects, and good treatment performance is of significant practical importance. Utility Model Content

[0003] In order to solve the problems existing in the prior art, this utility model provides a wastewater treatment system using a multi-metal composite Fenton catalyst.

[0004] The technical solution adopted by this utility model to solve this problem is:

[0005] A wastewater treatment system using a multi-metal composite Fenton catalyst includes:

[0006] A two-stage catalytic-oxidation reaction tower includes a catalytic reaction tower and an oxidation reaction tower connected in sequence. Both the catalytic reaction tower and the oxidation reaction tower are provided with multi-layered multi-metal catalyst support plates. Each layer of the multi-metal catalyst support plate is filled with multi-metal catalyst packing. Both the catalytic reaction tower and the oxidation reaction tower are provided with an aeration and water distribution system at the bottom of the tower.

[0007] The multi-metal catalyst packing is composed of several layers of plate-type packing monomers stacked sequentially. The surface of the plate-type packing monomers is loaded with an iron-manganese-carbon-silicon-nickel multi-metal active layer to form a stable heterogeneous catalytic system. The plate-type packing monomers are corrugated plate structures with through holes, and open corrugated flow channels are formed between adjacent plate-type packing monomers.

[0008] In the above technical solution, the multi-metal catalyst packing is a cylindrical structure with a diameter slightly smaller than the inner diameter of the catalytic reaction tower and the oxidation reaction tower.

[0009] In the above technical solution, the multi-metal catalyst support plate is a honeycomb perforated plate.

[0010] In the above technical solution, the plate packing unit is a carbon steel corrugated plate substrate, the surface of the carbon steel corrugated plate substrate is treated with high temperature oxidation or coating, and the corrugated flow channel is sawtooth or sinusoidal.

[0011] In the above technical solution, the surface of the carbon steel corrugated plate has a corrugated profile, forming a directional flow channel.

[0012] In the above technical solution, in the multi-metal catalyst packing, the corrugations of the plate packing units located in the odd-numbered layers are parallel to each other, the corrugations of the plate packing units located in the even-numbered layers are parallel to each other, and the corrugations of the plate packing units located in the odd-numbered layers form a certain angle with the corrugations of the plate packing units located in the even-numbered layers.

[0013] In the above technical solution, the plate packing units are arranged vertically and stacked side by side in sequence along the horizontal direction to form a cylindrical multi-metal catalyst packing; or, the plate packing units are arranged horizontally and stacked side by side in sequence along the vertical direction to form a cylindrical multi-metal catalyst packing.

[0014] In the above technical solution, both the catalytic reaction tower and the oxidation reaction tower are provided with inspection holes on the side wall corresponding to the position of the multi-metal catalyst packing, a tower water inlet is provided at the bottom of the side wall, a tower water outlet is provided at the top of the side wall, a tower exhaust port is provided at the top of the tower, and a tower sewage discharge port is provided at the bottom of the tower.

[0015] In the above technical solution, the inlet of the catalytic reaction tower is connected to the first sewage pipe, and the first sewage pipe is connected to the high-level sulfuric acid tank via a tee and a sulfuric acid high-level tank pipe. The inlet of the oxidation reaction tower is connected to the outlet of the catalytic reaction tower via a second sewage pipe. The second sewage pipe is connected to the hydrogen peroxide dosing tank via a tee and a hydrogen peroxide dosing tank pipe, and to the ferrous sulfate dosing tank via a tee and a ferrous sulfate dosing pipe.

[0016] In the above technical solution, the aeration and water distribution system includes a fishbone-shaped water distributor and a ring-shaped aeration pipe network.

[0017] The advantages and positive effects of this utility model are:

[0018] 1. This utility model utilizes the synergistic effect of combining a multi-metal catalyst with a two-stage tower structure. Through synergistic innovation of materials, structure and process, the multi-metal catalyst solves the pain points of iron sludge pollution, pH limitation and low mass transfer efficiency in the traditional Fenton process. It has been pilot-scale verified in the treatment of high-concentration organic wastewater and has the potential for large-scale promotion.

[0019] 2. This utility model adopts a two-stage series catalytic oxidation integrated design. Through segmented catalytic oxidation, the degradability of recalcitrant pollutants can be achieved. The two-stage catalytic oxidation reaction tower is filled with multi-layer multi-metal catalyst packing. Combined with the bottom aeration and water distribution system, it can produce a fluidized bed effect. The multi-layer multi-metal catalyst supports the tower plate filled with multi-metal catalyst, which can fully contact with the sewage to enhance the mass transfer efficiency and achieve pH control and Fenton reaction stability.

[0020] 3. In this utility model, the multi-metal catalyst packing adopts a cylindrical plate corrugated structure. The carbon steel corrugated plate substrate is prepared by calendering and laser cutting technology. Through wet impregnation and high-temperature sintering process, an iron-manganese-carbon-silicon-nickel multi-metal active layer is loaded on the surface of the plate packing monomer to form a stable heterogeneous catalytic system. Compared with traditional powder catalysts, the iron salt consumption is reduced by 50%, the sludge production is reduced by 80%, the service life is >3 years, the catalyst loss rate is <3%, and the maintenance cost is reduced by 40% compared with the traditional Fenton process.

[0021] 4. In this utility model, the fluid is guided to form turbulence through a sawtooth or sinusoidal waveform flow channel, which reduces the short-flow phenomenon commonly found in traditional fixed beds, ensures uniform distribution of reactants, and achieves a specific surface area of ​​300-500 m² / m³. The contact efficiency between pollutants and catalyst is improved by 20%-25%. In addition, a directional flow channel is designed on the surface of the carbon steel corrugated plate, combined with an open flow channel structure, to avoid the accumulation of suspended solids. It is suitable for the treatment of difficult-to-degrade mixed wastewater in chemical, pharmaceutical, printing and dyeing, and other industries. Attached Figure Description

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this utility model. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

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

[0024] Figure 2 This is a schematic diagram of a half-section of a catalytic reaction tower or an oxidation reaction tower;

[0025] Figure 3 yes Figure 2 A schematic diagram of the structure with the multi-metal catalyst packing removed.

[0026] Figure 4 This is a schematic diagram of the structure of a multi-metal catalyst packing. Figure 1 ;

[0027] Figure 5 This is a schematic diagram of the structure of a plate packing unit;

[0028] Figure 6 yes Figure 4 A schematic diagram of the structure of a polymetallic catalyst packing at another angle.

[0029] Figure 7 yes Figure 4 Front view of the packing material for polymetallic catalysts;

[0030] Figure 8 yes Figure 4 Top view of the packing material for a polymetallic catalyst;

[0031] Figure 9 This is a schematic diagram of the structure of a multi-metal catalyst packing. Figure 2 ;

[0032] Figure 10 yes Figure 9 A schematic diagram of the structure of a polymetallic catalyst packing at another angle.

[0033] Figure 11 This is a schematic diagram of a fishbone-type water distributor;

[0034] Figure 12 yes Figure 11 Top view;

[0035] Figure 13 This is a schematic diagram of the structure of a ring-shaped aeration pipe network;

[0036] Figure 14 yes Figure 13 Top view.

[0037] In the diagram: 1-Catalytic reaction tower; 2-Oxidation reaction tower; 3-Multi-metal catalyst support plate; 4-Multi-metal catalyst packing; 401-Plate packing unit; 5-Inspection hole; 6-Tower inlet; 7-Tower outlet; 8-Tower exhaust port; 9-Tower sewage outlet; 10-First sewage pipe; 11-Sulfuric acid high-level tank; 12-Second sewage pipe; 13-Hydrogen peroxide dosing tank; 14-Ferrous sulfate dosing pipe; 15-Fishbone type water distributor; 16-Annular aeration network; 17-Tower aeration port; 18-Third sewage pipe. Detailed Implementation

[0038] First, it should be noted that the specific structure, features, and advantages of this utility model will be described in detail below by way of examples. However, all descriptions are for illustrative purposes only and should not be construed as limiting the utility model in any way. Furthermore, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, can still be arbitrarily combined or deleted among these technical features (or their equivalents) to obtain more other embodiments of this utility model that may not be directly mentioned herein. Additionally, for the sake of simplifying the drawings, the same or similar technical features may be indicated only in one place in the same drawing.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," and "screw-on" 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 or an electrical connection; 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 utility model according to the specific circumstances. The utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0040] A wastewater treatment system using a multi-metal composite Fenton catalyst includes:

[0041] A two-stage catalytic-oxidation reaction tower includes a catalytic reaction tower 1 and an oxidation reaction tower 2 connected in sequence. Both the catalytic reaction tower 1 and the oxidation reaction tower 2 are provided with multi-layered multi-metal catalyst support plates 3. Each layer of the multi-metal catalyst support plates 3 is filled with multi-metal catalyst packing 4. Both the catalytic reaction tower 1 and the oxidation reaction tower 2 are provided with an aeration and water distribution system at the bottom.

[0042] The multi-metal catalyst packing 4 is composed of several layers of plate-type packing monomers 401 stacked sequentially. The surface of the plate-type packing monomers 401 is loaded with an iron-manganese-carbon-silicon-nickel multi-metal active layer to form a stable heterogeneous catalytic system. The plate-type packing monomers 401 are corrugated plate structures with through holes, and open corrugated flow channels are formed between adjacent plate-type packing monomers 401.

[0043] In this embodiment, a wastewater treatment system using a multi-metal composite Fenton catalyst is specifically an improved fixed-bed reaction tower based on the Fenton reaction principle. Through the integrated application of a two-stage catalytic-oxidation reaction tower structure and a multi-metal catalyst, it achieves improved oxidation efficiency and optimized operating costs in the wastewater treatment field. Specifically, it includes: a two-stage catalytic-oxidation reaction tower and multi-metal catalyst packing, wherein:

[0044] The two-stage catalytic oxidation reaction tower comprises a catalytic reaction tower 1 and an oxidation reaction tower 2 connected in sequence. It adopts a two-stage series integrated catalytic oxidation design, achieving the degradation of recalcitrant pollutants through segmented catalytic oxidation. Both catalytic reaction tower 1 and oxidation reaction tower 2 are equipped with multi-layered multi-metal catalyst support plates 3. These multi-metal catalyst support plates 3 are honeycomb perforated plates, facilitating fluid upward flow within the tower. Each layer of multi-metal catalyst support plate 3 is filled with multi-metal catalyst packing 4, with gaps between layers. Both catalytic reaction tower 1 and oxidation reaction tower 2 are equipped with an aeration and water distribution system at the bottom. The multi-layered multi-metal catalyst packing within the two-stage catalytic oxidation reaction tower, combined with the bottom aeration and water distribution system, produces a fluidized bed-like effect. The multi-layered multi-metal catalyst support plates ensure sufficient contact between the multi-metal catalyst and wastewater, enhancing mass transfer efficiency and achieving pH control and Fenton reaction stability.

[0045] The multi-metal catalyst packing consists of several layers of plate-type packing monomers 401 stacked sequentially. Each plate-type packing monomer 401 has a corrugated plate structure with through-holes, forming open corrugated flow channels between adjacent monomers. The packing porosity is >90%, and the open flow channel design reduces bed pressure drop to 60%-70% of traditional packings, eliminating the need for backwashing during long-term operation. Through wet impregnation and high-temperature sintering (800-1000℃), an iron-manganese-carbon-silicon-nickel multi-metal active layer is loaded onto the surface of the plate-type packing monomer 401, forming a stable heterogeneous catalytic system. The active component loading is controlled at 10%-15% (mass fraction) to ensure a balance between catalytic efficiency and mechanical strength (compressive strength >8MPa). The cylindrical plate corrugated packing can be directly stacked on different trays of a Fenton tower without additional support structures, reducing installation complexity. The open corrugated flow channel design reduces the risk of suspended solids clogging, making it suitable for treating recalcitrant mixed wastewater from chemical, pharmaceutical, and dyeing industries.

[0046] This wastewater treatment system combines the synergistic effect of multi-metal catalysts with a two-stage tower structure design. Through synergistic innovation in materials, structure, and process, the multi-metal catalysts address the pain points of traditional Fenton processes, such as iron sludge contamination, pH limitation, and low mass transfer efficiency. It has completed pilot-scale verification in high-concentration organic wastewater treatment scenarios and possesses the potential for large-scale deployment. While maintaining the highly efficient oxidation characteristics of the Fenton reaction, this wastewater treatment system effectively solves the technical bottlenecks of high operating costs and large footprint of traditional devices. Its efficiency and economy have been verified in high-turbidity industrial wastewater treatment scenarios.

[0047] Furthermore, in this embodiment, the multi-metal catalyst support plate 3 can also be considered as a honeycomb perforated plate.

[0048] Furthermore, in this embodiment, the multi-metal catalyst packing 4 can be designed with a cylindrical plate corrugated structure, with a diameter slightly smaller than the inner diameter of the catalytic reaction tower 1 and the oxidation reaction tower 2 (e.g., if the inner diameter of the tower is D, the packing diameter is D-5mm), ensuring tight packing and preventing fluid short-circuiting. The cylindrical plate corrugated packing can be directly stacked on different trays of the Fenton tower without additional support structures, reducing installation complexity. The multi-metal catalyst packing 4, with its cylindrical plate corrugated structure, achieves high throughput and low pressure drop, adapting to the standardized packing requirements of fixed-bed Fenton towers.

[0049] Furthermore, in this embodiment, the plate filler monomer 401 can be considered as a carbon steel corrugated plate substrate, which is prepared by rolling and laser cutting technology, and the corrugated structure is precisely processed by combining 3D printing mold.

[0050] Furthermore, in this embodiment, the surface of the carbon steel corrugated plate substrate may be subjected to high-temperature oxidation or coating treatment (such as Fe3O4 / Al2O₌ composite layer) to improve corrosion resistance and serve as a pre-loaded substrate for iron-based active components.

[0051] Furthermore, in this embodiment, the corrugated flow channel can be designed as a sawtooth or sinusoidal waveform. By designing the corrugated channel as a sawtooth or sinusoidal waveform, the contact efficiency between pollutants and catalyst can be improved by enhancing fluid turbulence, while maintaining a low pressure drop (<50Pa / m).

[0052] Furthermore, in this embodiment, during the loading of the active components onto the carbon steel corrugated plate substrate, gradient heating sintering (200℃→500℃→1000℃) is used to prevent deformation of the carbon steel substrate, while simultaneously promoting the crystal growth of iron-manganese-carbon-silicon-nickel oxides. The combination of calendering and gradient sintering technology overcomes the challenge of matching the thermal expansion coefficients of the carbon steel carrier and the active components. The iron-manganese-carbon-silicon-nickel multimetallic active layer is bonded to the carbon steel substrate, balancing catalytic activity and mechanical stability. Compared to traditional powder catalysts, iron salt consumption is reduced by 50%, sludge production is reduced by 80%, service life is >3 years, catalyst loss rate is <3%, and maintenance costs are reduced by 40% compared to the traditional Fenton process.

[0053] Furthermore, in this embodiment, the surface of the carbon steel corrugated plate may have a corrugated profile, forming directional flow channels. Using precision-machined, regular corrugated channels, the fluid is guided to form turbulence through sawtooth or sinusoidal flow channels, reducing short-circuiting phenomena common in traditional fixed beds, ensuring uniform distribution of reactants, achieving a specific surface area of ​​300-500 m² / m³, and improving the contact efficiency between pollutants and catalyst by 20%-25%. In addition, the directional flow channels designed on the surface of the carbon steel corrugated plate, combined with an open flow channel structure, prevent suspended solids accumulation, making it suitable for high-turbidity wastewater (SS≤500mg / L).

[0054] Furthermore, in this embodiment, the corrugations of the plate packing monomers 401 in the odd-numbered layers are parallel to each other, the corrugations of the plate packing monomers 401 in the even-numbered layers are parallel to each other, and the corrugations of the plate packing monomers 401 in the odd-numbered layers form a certain angle with the corrugations of the plate packing monomers 401 in the even-numbered layers. Taking this embodiment as an example, the angle between the corrugations of two adjacent layers of plate packing monomers 401 is 90 degrees, and the two layers are perpendicular to each other.

[0055] Furthermore, in this embodiment, one could also consider, such as Figure 4-6 As shown, the plate-type packing monomers 401 are vertically arranged and stacked side by side in the transverse direction to form a cylindrical multi-metal catalyst packing 4; or, as shown... Figure 9-10 As shown, the plate packing unit 401 is placed horizontally and stacked and fixed in sequence along the vertical direction, thus forming a cylindrical multi-metal catalyst packing 4.

[0056] Furthermore, in this embodiment, both the catalytic reaction tower 1 and the oxidation reaction tower 2 have inspection holes 5 on the side walls corresponding to the positions of the multi-metal catalyst packing 4. The inspection holes serve as inspection ports, internal inspection ports, and catalyst loading ports. A tower water inlet 6 is provided at the bottom of the side wall of the tower, a tower water outlet 7 is provided at the top of the side wall of the tower, a tower exhaust port 8 is provided at the top of the tower, the exhaust port 8 is connected to the exhaust manifold, and a tower sewage discharge port 9 is provided at the bottom of the tower. Example 2

[0057] A wastewater treatment system using a multi-metal composite Fenton catalyst includes a two-stage catalytic-oxidation reaction tower. The two-stage catalytic-oxidation reaction tower includes a catalytic reaction tower 1 and an oxidation reaction tower 2 connected in sequence. The inlet 6 of the catalytic reaction tower 1 is connected to a first wastewater pipe 10. The first wastewater pipe 10 is connected to a high-level sulfuric acid tank 11 via a tee and a sulfuric acid high-level tank pipe. The inlet 6 of the oxidation reaction tower 2 is connected to the outlet 7 of the catalytic reaction tower 1 via a second wastewater pipe 12. The second wastewater pipe is connected to a hydrogen peroxide dosing tank 13 via a tee and a hydrogen peroxide dosing tank pipe, and to a ferrous sulfate dosing tank via a tee and a ferrous sulfate dosing pipe 14. The outlet 7 of the oxidation reaction tower 2 is connected to a third wastewater pipe 18.

[0058] In this embodiment, sulfuric acid is pumped from the reagent room into the high-level sulfuric acid tank, and then enters the first wastewater pipe of catalytic reaction tower 1 via the dosing pipeline. By adding sulfuric acid to catalytic reaction tower 1, an acidification reaction is carried out with the iron-based catalyst to adjust the pH value (3.5~4.5). Hydrogen peroxide is pumped from the reagent room into the high-level hydrogen peroxide tank, and then enters the second wastewater pipe of oxidation reaction tower 2 via the dosing pipeline. Ferrous sulfate is pumped from the reagent room into the second wastewater pipe of oxidation reaction tower 2. By adding hydrogen peroxide and ferrous sulfate to oxidation reaction tower 2, a heterogeneous Fenton reaction is carried out with the participation of a multi-metal catalyst. By loading multiple layers of multi-metal catalyst and quantitatively controlling the addition of sulfuric acid and hydrogen peroxide, the reagent consumption is controlled. By setting up high-level sulfuric acid tanks and high-level hydrogen peroxide tanks, the addition amounts of sulfuric acid and hydrogen peroxide can be stably controlled with accuracies within ±3% and ±2%, respectively.

[0059] Furthermore, in this embodiment, the aeration and water distribution system may include a fishbone-shaped water distributor 15 and an annular aeration network 16. The fishbone-shaped water distributor 15 is connected to the tower inlet interface 6, and the annular aeration network 16 is connected to the tower aeration interface 17, which is connected to an aeration pipe.

[0060] In this embodiment, fishbone-shaped water distributors are used in both the catalytic and oxidation towers, installed at the bottom of both towers, which has the following advantages:

[0061] Uniform water distribution: The fishbone-shaped water distributor's structural design ensures that the liquid is evenly distributed as it passes through, thereby ensuring uniform water flow rate and water quality distribution throughout the entire water treatment system.

[0062] High efficiency and energy saving: Due to the uniform distribution of liquid, water treatment efficiency can be improved and energy consumption can be reduced.

[0063] Simple structure: The fishbone-type water distributor has a relatively simple structure, making it easy to install and maintain.

[0064] Excellent anti-aging properties: The fishbone-shaped water distributor is made of high-quality stainless steel, which has good anti-aging properties and a long service life.

[0065] Not easily worn: Especially the 316 stainless steel fishbone-shaped water distributor, which has good wear resistance and is suitable for various harsh environments.

[0066] Wide range of applications: Fishbone-type water distributors are suitable for various fields such as chemical, petrochemical, water treatment, beverage, ion exchange, cation exchange bed, and mixed bed, and can meet the requirements of different containers.

[0067] In this embodiment, both the catalytic and oxidation towers utilize a ring-shaped perforated aeration pipe network installed at the bottom of both towers, offering the following advantages:

[0068] Uniform aeration and efficient air supply: The aeration network is arranged in a ring-shaped pipeline, forming a closed loop for air. This improves air supply stability and reduces pressure loss. The ring-shaped closed-loop design ensures uniform gas diffusion, avoiding the "air blockage" phenomenon caused by traditional single-point aeration, and maintaining the continuous high oxidation capacity of the reaction system.

[0069] It can enhance the gas-liquid mixing effect: promote the rapid generation of hydroxyl radicals (·OH) from H2O2 and Fe²⁺, and accelerate the oxidative degradation rate of organic pollutants.

[0070] High reagent utilization rate: The microbubbles (3-5mm in diameter) generated by aeration are evenly distributed, enhancing the contact area between wastewater and the catalyst, reducing local concentration deviations, and improving reagent utilization rate.

[0071] Wide range of applications: Suitable for the pretreatment or advanced treatment of high-concentration organic wastewater (such as pharmaceutical, printing and dyeing, and petrochemical wastewater), especially suitable for medium and large-scale wastewater treatment projects that require strict control of reagent costs and energy consumption, and has high industrial application value.

[0072] The wastewater treatment system using the multi-metal composite Fenton catalyst described above has the following technical advantages:

[0073] I. Fluid Channel Regularization Design

[0074] Modular corrugated structure

[0075] Employing precision-machined corrugated channels, the fluid is guided to form turbulence through sawtooth or sinusoidal flow channels, reducing short-flow phenomena commonly found in traditional fixed-bed reaction towers and ensuring uniform distribution of reactants. The modular corrugated flow guide design achieves uniform flow distribution, with a specific surface area of ​​300-500 m² / m³, improving the contact efficiency between pollutants and catalyst by 20%-25%.

[0076] Traffic diversion and distribution optimization

[0077] The carbon steel corrugated plate base is designed with directional flow channels, combined with an open flow channel structure to avoid the accumulation of suspended solids, and is suitable for high turbidity wastewater (SS≤500mg / L).

[0078] II. Significantly reduced fluid resistance

[0079] High porosity and anti-clogging properties

[0080] With a packing porosity of >90%, the open flow channel design reduces bed pressure loss to 60%-70% of that of traditional packings. It can operate without backwashing for a long time and is suitable for long-term stable operation of high turbidity wastewater.

[0081] Low-energy operation

[0082] CFD simulation optimization of the fluid dynamics structure reduces aeration energy consumption. After the renovation of a 10,000-ton-level wastewater treatment plant, aeration power consumption was reduced by 18%, saving more than 800,000 yuan in electricity costs annually.

[0083] III. Mass transfer efficiency is comprehensively improved.

[0084] Multi-level reaction interface enhancement

[0085] Iron-based active components (such as iron-manganese-carbon-silicon-nickel polymetallic compounds) are loaded onto the surface of a carbon steel corrugated plate substrate. Through heterogeneous catalytic reaction, the generation of hydroxyl radicals (·OH) is accelerated, the COD removal rate is increased by 10%-20%, and the reagent consumption is reduced by more than 50%.

[0086] Flow regime regulation and reaction kinetics optimization

[0087] The fixed bed mode combined with the flow-guiding design of the structured packing promotes efficient mass transfer in the gas-liquid-solid three phases, increases H2O2 utilization by 30%-40%, and reduces iron salt dosage by 50%-70%.

[0088] IV. Engineering Adaptability and Economy

[0089] Synergistic effect of aeration system

[0090] The open flow channel and modular stacking design of the structured packing material are compatible with high-efficiency aeration systems. The flow guiding structure optimizes oxygen transfer efficiency, increasing oxygen transfer efficiency by 25%. It is especially suitable for wastewater with high color and high turbidity (such as light utilization rate of 89.49% under 703 turbidity unit conditions).

[0091] Lifecycle cost advantages

[0092] Although the initial investment is 15%-20% higher than that of random packing, the service life is >10 years, and the overall cost is 35% lower than that of traditional solutions in the third year of operation.

[0093] The above embodiments have provided a detailed description of the present invention, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A wastewater treatment system using a multi-metal complex Fenton catalyst, characterized by comprising: a wastewater treatment tank; a Fenton catalyst tank; a pump; a pipe; and a control unit. include: A two-stage catalytic-oxidation reaction tower includes a catalytic reaction tower and an oxidation reaction tower connected in sequence. Both the catalytic reaction tower and the oxidation reaction tower are provided with multi-layered multi-metal catalyst support plates. Each layer of the multi-metal catalyst support plate is filled with multi-metal catalyst packing. Both the catalytic reaction tower and the oxidation reaction tower are provided with an aeration and water distribution system at the bottom of the tower. The multi-metal catalyst packing is composed of several layers of plate-type packing monomers stacked sequentially. The surface of the plate-type packing monomers is loaded with an iron-manganese-carbon-silicon-nickel multi-metal active layer to form a stable heterogeneous catalytic system. The plate-type packing monomers are corrugated plate structures with through holes, and open corrugated flow channels are formed between adjacent plate-type packing monomers.

2. The wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: The multi-metal catalyst packing has a cylindrical structure with a diameter slightly smaller than the inner diameter of the catalytic reaction tower and the oxidation reaction tower.

3. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: The multi-metal catalyst support tray is a honeycomb perforated plate.

4. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: The plate packing unit is a carbon steel corrugated plate substrate, the surface of which is treated with high-temperature oxidation or coating, and the corrugated flow channel is sawtooth or sinusoidal.

5. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 4, characterized in that: The surface of the carbon steel corrugated plate has a corrugated profile, forming a directional flow channel.

6. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: In the multi-metal catalyst packing, the corrugations of the plate packing units located in the odd-numbered layers are parallel to each other, the corrugations of the plate packing units located in the even-numbered layers are parallel to each other, and the corrugations of the plate packing units located in the odd-numbered layers form a certain angle with the corrugations of the plate packing units located in the even-numbered layers.

7. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: The plate packing units are arranged vertically and stacked side by side in sequence along the horizontal direction to form a cylindrical multi-metal catalyst packing; or, the plate packing units are arranged horizontally and stacked side by side in sequence along the vertical direction to form a cylindrical multi-metal catalyst packing.

8. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: Both the catalytic reaction tower and the oxidation reaction tower have inspection holes on the side walls corresponding to the positions of the multi-metal catalyst packing, a tower water inlet at the bottom of the side wall, a tower water outlet at the top of the side wall, a tower exhaust port at the top of the tower, and a tower sewage discharge port at the bottom of the tower.

9. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 8, characterized in that: The inlet of the catalytic reaction tower is connected to the first sewage pipe. The first sewage pipe is connected to the high-level sulfuric acid tank via a tee and a sulfuric acid high-level tank pipe. The inlet of the oxidation reaction tower is connected to the outlet of the catalytic reaction tower via a second sewage pipe. The second sewage pipe is connected to the hydrogen peroxide dosing tank via a tee and a hydrogen peroxide dosing tank pipe, and to the ferrous sulfate dosing tank via a tee and a ferrous sulfate dosing pipe.

10. A wastewater treatment system using a multi-metal composite Fenton catalyst according to claim 1, characterized in that: The aeration and water distribution system includes a fishbone-type water distributor and a ring-shaped aeration pipe network.

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