An environmentally friendly treatment device

Abstract

The application discloses an environment-friendly treatment equipment and belongs to the technical field of electrochemical oxidation. The equipment comprises a shell (4), a rotating shaft (1), a moving disc (2), a moving disc grinding piece (21), a fixed disc (3) and a fixed disc grinding piece (31). The moving disc grinding piece (21) is made of conductive material (stainless steel, wear-resistant alloy) or an insulating base body with a BDD film deposited on the surface and is connected with the negative pole of a direct-current power supply. The fixed disc grinding piece (31) is made of an insulating base body with a BDD film deposited on the surface and is connected with the positive pole of the direct-current power supply. When working, a direct-current voltage of 2.8-35 V is applied, a discharge gap of 0.25-20 mm is set between the fixed disc grinding piece (31) and the moving disc grinding piece (21), and ·OH is generated through the electric field effect to realize high-efficiency oxidative degradation of organic matters in materials. Through the BDD electrode material and the dynamic rotating structure design, the application solves the problems of easy corrosion of traditional electrodes, insufficient reaction of materials and low oxidation efficiency and is suitable for treatment of chemical wastewater, medical wastewater and refractory organic matters and has the advantages of high degradation rate.

Description

Technical Field

[0001] This invention relates to the field of environmental protection treatment technology, specifically to an environmental protection treatment device based on the principle of electrochemical oxidation, which is suitable for the oxidative degradation treatment of wastewater, organic pollutants and other materials. Background Technology

[0002] Traditional environmental treatment technologies, such as chemical oxidation, consume large amounts of oxidants, leading to high costs and secondary pollution. Electrochemical oxidation technology directly generates hydroxyl radicals (·OH) through electrode reactions, offering advantages in efficiency and environmental friendliness. However, existing equipment suffers from drawbacks such as easily corroded electrode materials, low current efficiency, and complex structures. For example, traditional electrode materials (such as titanium-based coated electrodes) are prone to detachment under high voltage, and it is difficult to balance conductivity and catalytic activity. Therefore, there is an urgent need to develop an environmentally friendly treatment device with a compact structure, high electrode stability, and strong oxidation efficiency. Technically, boron-doped diamond (BDD) thin-film electrodes are considered ideal materials due to their wide potential window, high stability, and strong ·OH generation capability, but their integrated application in dynamic equipment is not yet mature. This invention achieves efficient and sustained organic matter degradation through a combination design of moving and stationary electrodes, combined with the characteristics of BDD electrodes. Summary of the Invention

[0003] Purpose of the invention

[0004] This invention provides an environmentally friendly treatment device that solves the problems of short electrode life and low oxidation efficiency in traditional equipment by optimizing electrode materials and structural design, thereby achieving efficient degradation of materials.

[0005] Technical solution

[0006] The environmental protection treatment equipment of the present invention includes the following core components (in conjunction with the appendix). Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 Appendix Figure 6 ).

[0007] Housing (4): Contains all components and is made of corrosion-resistant materials (such as PVC, stainless steel, cast iron).

[0008] Feed inlet (5): The feed inlet (5) is located in the shell (4). The feed inlet (5) is connected to the material conveying device (such as a pressure pump or screw mechanism) and communicates with the fixed plate (3).

[0009] Discharge port (6): The discharge port (6) is located below the shell (4).

[0010] Rotating shaft (1): made of metal material, preferably stainless steel; located inside housing (4), driven by motor to rotate, with an adjustable speed range of 50 to 3000 r / min.

[0011] Moving disk (2): rigidly connected to rotating shaft (1), rotating synchronously with shaft. Moving disk (2) is made of metal material, preferably stainless steel; its surface is inlaid with moving disk grinding disc (21).

[0012] Moving disc grinding disc (21): The tooth profile cross-section is rectangular or trapezoidal, with a tooth tip width of 4-10 mm, a tooth root width of 3-5 mm, and a tooth height of 2-6 mm; the moving disc grinding disc (21) can be made of two types of materials:

[0013] BDD thin film deposition on insulating substrate: The substrate is preferably made of alumina, silicon carbide, or silicon nitride, and a BDD thin film is deposited on the surface with a boron doping concentration of 1×10⁻⁶. 20 ~5×10 21 atoms / cm 3 The deposition thickness is 3–100 μm, and it is connected to the negative terminal of a DC power supply.

[0014] Conductive material: Made of stainless steel, titanium alloy or wear-resistant alloy, directly connected to the negative terminal of DC power supply.

[0015] Fixed plate (3): Fixed to the housing (4), the fixed plate (3) is made of metal material, preferably stainless steel. Fixed plate grinding disc (31) is inlaid on the surface of the fixed plate (3).

[0016] Fixed grinding disc (31): The substrate is an insulating material (such as alumina, silicon carbide, silicon nitride), and the tooth profile cross-sectional shape and size are the same as those of the moving grinding disc (21); a BDD thin film is deposited on the surface with a boron doping concentration of 1×10⁻⁶. 20 ~5×10 21 atoms / cm 3 The deposition thickness is 3–100 μm, and it is connected to the positive terminal of a DC power supply.

[0017] Structural features

[0018] Modular assembly: According to the processing requirements, one or more moving discs (2) can be installed on the same rotating shaft (1), and one or more sets of moving disc grinding discs (21) can be embedded. One or more sets of fixed disc grinding discs (31) are embedded on the fixed disc (3). Each set of moving disc grinding discs (21) and fixed disc grinding discs (31) form a processing unit. Each device has at least one processing unit or multiple processing units. The combination mode of multiple processing units is parallel, series, or parallel first and then series.

[0019] Discharge gap: A discharge gap of 0.25 to 20 mm is set between the fixed grinding disc (31) and the moving grinding disc (21) for electric field action and material flow. When working, a DC voltage of 2.8 to 35 V is applied to generate a strong electric field to induce the generation of ·OH.

[0020] Working principle

[0021] Materials with a moisture content of 20% to 99% are fed through the feed inlet (5) and conveyed by a pressure pump or screw mechanism to the space between the fixed grinding disc (31) and the moving grinding disc (21). After physical and electrochemical reactions between the fixed grinding disc (31) and the moving grinding disc (21), the materials are discharged from the discharge outlet (6).

[0022] Physical function: The grinding discs shear and mix the materials, break up pollutant agglomerates, and increase the reaction contact surface.

[0023] Electrochemical action: The boron-doped diamond (BDD) film deposited on the surface of the fixed plate grinding disc (31) causes water to undergo an electrolytic reaction under the action of a strong electric field.

[0024] Anode (fixed disc grinding wheel): H₂O → ·OH + H₂ + +e - .

[0025] Cathode (moving disc grinding wheel): 2H + +2e - →H2↑.

[0026] The anode (fixed grinding disc) generates ·OH, and the cathode (moving grinding disc) releases hydrogen gas. The ·OH performs non-selective oxidation and decomposition of organic matter into harmless substances such as CO2 and H2O.

[0027] Synergistic effect: The dynamic structure avoids scaling on the electrode surface, and the high stability of the boron-doped diamond (BDD) film ensures long-term operating efficiency. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of a processing unit, showing the assembly relationship of the rotating shaft (1), the moving disk (2), the moving disk grinding disc (21), the fixed disk (3), the fixed disk grinding disc (31), the housing (4), the feed port (5), and the discharge port (6).

[0029] Appendix Figure 2 This diagram illustrates the parallel connection of multiple processing units, showing the material flow direction of each unit and the assembly relationship of each component.

[0030] Appendix Figure 3 This diagram shows multiple processing units connected in series, illustrating the material flow direction of each unit and the assembly relationship of each component.

[0031] Appendix Figure 4The diagram shows multiple processing units connected in parallel and in series, illustrating the material flow direction of each processing unit and the assembly relationship of each component.

[0032] Appendix Figure 5 The rectangular tooth profiles of the moving disc grinding wheel (21) and the fixed disc grinding wheel (31) are shown.

[0033] Appendix Figure 6 The trapezoidal tooth profile diagrams are shown for the moving disc grinding wheel (21) and the fixed disc grinding wheel (31). Detailed Implementation

[0034] Example 1

[0035] For treating phenol-containing wastewater, the moving grinding disc is made of 316L stainless steel and connected to the negative terminal of a 30V DC power supply. The stationary grinding disc has an alumina substrate with a BDD thin film deposited on its surface (boron doping concentration 2×10⁻⁶). 21 atoms / cm 3 The BDD deposition thickness is 15 μm, connected to the positive terminal of a 30V DC power supply. The discharge gap between the moving and fixed grinding discs is 2 mm, the moving disc rotates at 800 r / min, and the two processing units are connected in series. The effective area of ​​the grinding disc electrode is 2000 cm². 2 With a pumping flow rate of 30t / h, it can treat 10 tons of phenol-containing wastewater with a degradation rate of 95%.

[0036] Example 2

[0037] For treating papermaking wastewater, both the moving and stationary grinding discs are made of silicon carbide substrate, with a BDD thin film deposited on the surface (boron doping concentration 3×10⁻⁶). 21 atoms / cm 3 The BDD deposition thickness is 20 μm. The moving disc is connected to the negative terminal of a 25V DC power supply, and the fixed disc is connected to the positive terminal. The discharge gap is 1 mm, the moving disc rotates at 1100 r / min, and the three processing units are connected in series. The effective area of ​​the disc electrode is 3000 cm². 2 With a pumping flow rate of 30t / h, it can treat 10 tons of papermaking wastewater with a chemical oxygen demand (COD) removal rate of 97%.

[0038] Example 3

[0039] For processing starch plant precipitates, the moving grinding disc is made of Hastelloy alloy and connected to the negative terminal of a 20V DC power supply. The stationary grinding disc is silicon nitride-based, with a BDD thin film deposited on its surface (boron doping concentration 4×10⁻⁶). 21 atoms / cm 3 The BDD deposition thickness is 15 μm, connected to the positive terminal of a 20V DC power supply, with a 4 mm discharge gap between the moving and stationary grinding discs, and a moving disc rotation speed of 500 r / min, comprising one processing unit. The effective electrode area of ​​the grinding disc is 1085 cm². 2The screw conveyor operates at a rate of 30t / h, with a single pass and a COD removal rate of 85%.

[0040] Beneficial effects

[0041] Long electrode life: BDD film has both high conductivity and corrosion resistance, avoiding the problem of peeling off traditional electrode coatings.

[0042] High oxidation efficiency: The rotating disk enhances material mixing, and the narrow discharge gap increases the electric field strength, promoting the generation of ·OH.

[0043] Highly adaptable: It can be adapted to different types and concentrations of pollutants by adjusting the voltage, grinding disc material, and gap.

[0044] Industrial applications

[0045] This equipment can be applied to the treatment of chemical wastewater, medical wastewater, papermaking wastewater and other fields, and is especially suitable for the efficient removal of recalcitrant organic pollutants.

Claims

1. An environmental protection treatment device, characterized in that, include: Housing (4); rotating shaft (1) located inside housing (4); moving disk (2) connected to rotating shaft (1); fixed disk (3) fixed to housing (4); feed inlet (5) located on housing (4) and communicating with fixed disk (3) fixed to housing (4); discharge outlet (6) located below housing (4); fixed disk grinding disc (31) is embedded on the surface of fixed disk (3), and moving disk grinding disc (21) is embedded on the surface of moving disk (2). The moving grinding disc (21) is made of conductive material (stainless steel, titanium alloy or wear-resistant alloy material) or has a boron-doped diamond (BDD) film deposited on its surface as an insulating material substrate, and is connected to the negative terminal of a DC power supply; the fixed grinding disc (31) is made of an insulating material substrate, has a BDD film deposited on its surface, and is connected to the positive terminal of a DC power supply; when the device is working, a DC current is applied between the moving grinding disc (21) and the fixed grinding disc (31), and the DC voltage is 2.8 to 35V.

2. The environmental protection treatment equipment according to claim 1, characterized in that: The substrates of the moving grinding disc (21) and the fixed grinding disc (31) are insulating materials (such as alumina, silicon carbide, and silicon nitride), and BDD thin films (thickness 3-100 μm, boron doping concentration 1×10⁻⁶) are deposited on the surface. 20 ~5×10 21 atoms / cm 3 ); or the moving disc grinding plate (21) is made of stainless steel, titanium alloy or wear-resistant alloy material.

3. The environmental protection treatment equipment according to claim 1 or 2, characterized in that: The discharge gap between the fixed grinding disc (31) and the moving grinding disc (21) is set to be 0.25-20 mm.

4. The environmental protection treatment equipment according to claim 1, characterized in that: The rotating shaft (1) can be equipped with one or more moving disks (2), each moving disk is inlaid with one or more sets of moving disk grinding discs (21), and one or more sets of fixed disk grinding discs (31) are correspondingly inlaid on the fixed disk (3). Each set of moving disk grinding discs (21) and fixed disk grinding discs (31) form a processing unit.

5. The environmental protection treatment equipment according to claim 4, characterized in that: The device includes one or more processing units; when there are multiple processing units, the combination mode is parallel, series, or parallel followed by series.

6. The environmental protection treatment equipment according to claim 1, characterized in that: The moving disc grinding wheel (21) and the fixed disc grinding wheel (31) have rectangular or trapezoidal tooth shapes, with a tooth tip width of 4-10 mm, a tooth root width of 3-5 mm, and a tooth height of 2-6 mm.

7. The environmental protection treatment equipment according to any one of claims 1 to 6, characterized in that: When the device is working, hydroxyl radicals (·OH) are generated between the moving grinding disc (21) and the fixed grinding disc (31) under the action of an electric field due to electrochemical reaction, which oxidizes and decomposes organic matter passing through the discharge gap.

Images