A pretreatment device and method for multi-type wastewater

Abstract

The present invention discloses a pretreatment device and method for multiple types of wastewater, including chemical wastewater and oily wastewater. The pretreatment device comprises a sequentially connected storage tank assembly, a coagulation and flotation assembly, and a multi-component catalytic oxidation assembly. The storage tank assembly includes multiple wastewater storage tanks corresponding to each type of wastewater. The coagulation and flotation assembly includes an oil scraper and a pressurized dissolved air flotation machine. The pressurized dissolved air flotation machine removes emulsified and dissolved substances using pressurized gas. The oil scraper is located above the pressurized dissolved air flotation machine to remove suspended matter in the wastewater. The multi-component catalytic oxidation assembly includes a catalytic chamber containing multiple types of catalytic oxidation components. Organic pollutants in the multiple types of wastewater are degraded by the catalytic oxidation components within the catalytic chamber. Multiple types of wastewater are collected and treated separately, and the multiple types of catalytic oxidation components are used to rapidly degrade organic compounds, ensuring that the water quality at the outlet remains consistently up to standard.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and in particular relates to a pretreatment device and method for multiple types of wastewater. Background Art

[0002] Wastewater treatment plants in industrial areas (such as ports and terminals) often need to treat various types of wastewater generated from different areas, such as acid and alkali wastewater and chemical wastewater from a terminal, as well as ship washing water from the seaport area.

[0003] The quality of wastewater fluctuates greatly due to different production processes. Different treatment processes need to be adopted for different wastewaters. Various types of wastewater will be treated in different ways. For example, oily wastewater should first be treated to remove oil and turbidity. Acidic and alkaline wastewater can enter the back-end treatment system or be directly discharged after neutralization. Chemical wastewater needs to be pre-treated to degrade toxic substances to ensure the normal operation of the biochemical system; low-concentration wastewater such as ground cleaning wastewater and domestic sewage can directly enter the biochemical system.

[0004] Some research has also been conducted on the comprehensive treatment of various types of wastewater. For example, patent CN109626749A provides a multifunctional integrated sewage treatment device and its treatment process. This sewage treatment device draws on the structural characteristics of the Orbel oxidation ditch, vertical flow sedimentation tank and biochemical treatment, and integrates the process characteristics of flocculation, hydrolysis, membrane bioreactor and filtration. It is designed as a circular cylindrical integrated steel structure with an inner cylinder, a middle cylinder and an outer cylinder. According to its treatment process flow and function, it is divided into seven zones: flocculation sedimentation zone, hydrolysis acidification zone, oil foam removal zone, anoxic zone, biofilm reaction zone, adsorption filtration zone and clear water zone. It realizes the effective treatment of different industries and different types of sewage and unattended operation of PLC automatic control. It can also be divided into automatic operation and intelligent control operation according to the investment amount. The maximum sewage treatment scale of a single treatment unit is 250 tons / day.

[0005] For example, patent CN112851018A provides a silicon industrial park wastewater treatment process and device. In view of the technical problems in the prior art of silicon industrial parks, when white carbon black wastewater and comprehensive wastewater of the park are mixed for treatment, the salt content is high and biochemical degradation is difficult. When the two types of wastewater are treated separately, the ammonia nitrogen and total nitrogen in the comprehensive wastewater of the park are high, and the carbon-nitrogen ratio is low. The treatment effect of the traditional denitrification process is not ideal, and a large amount of additional carbon source needs to be added. This solution provides a silicon industrial park wastewater treatment process, which takes out a small part of the wastewater bypass from the white carbon black wastewater, and uses the sulfate in the white carbon black wastewater to convert it into reduced sulfur, providing a sulfur source for the sulfur autotrophic denitrification bacteria community, and realizing the removal of nitrogen pollution from low carbon-nitrogen ratio wastewater without adding a carbon source. This solution also provides a dissimilation / denitrification device, which can realize sulfur conversion and sulfur autotrophic denitrification reaction in the same device, realizing the efficient treatment of two different types of wastewater, with a compact rhythm, no transfer process, and efficient reaction.

[0006] However, the treatment of multiple types of wastewater by the above-mentioned existing technologies is still limited to traditional wastewater treatment methods, which does not take into account the fluctuations in water quality caused by the different amounts of wastewater of various types, and cannot ensure that the effluent end is always in a standard state.

[0007] Therefore, how to design a pretreatment device for multiple types of wastewater that can cope with various types of wastewater and ensure stable water quality under different wastewater volumes so that the water quality at the effluent end is continuously in compliance with the standards is an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0008] In response to the above-mentioned deficiencies in the prior art, the present invention provides a pretreatment device and method for multiple types of wastewater, including chemical wastewater and oily wastewater. The pretreatment device includes: a storage tank assembly, a coagulation and flotation assembly, and a multi-component catalytic oxidation assembly, which are connected in sequence. The storage tank assembly includes multiple wastewater storage tanks corresponding to each type of wastewater. The coagulation and flotation assembly includes an oil scraper and a pressurized dissolved air flotation machine. The pressurized dissolved air flotation machine removes emulsified and dissolved substances through pressurized gas. The oil scraper is arranged above the pressurized dissolved air flotation machine to remove suspended matter in the wastewater. The multi-component catalytic oxidation assembly is provided with a catalytic chamber, which is provided with multiple types of catalytic oxidation components. The organic pollutants in the multiple types of wastewater are degraded by the catalytic oxidation components in the catalytic chamber. The present invention classifies and collects multiple types of wastewater and treats them separately. In particular, it uses multiple types of catalytic oxidation components to achieve rapid degradation of organic compounds, ensuring that the water quality at the end of the effluent is continuously up to standard.

[0009] In a first aspect, the present invention provides a pretreatment device for multiple types of wastewater, wherein the multiple types of wastewater include chemical wastewater and oily wastewater, and the pretreatment device comprises: a storage tank component, a coagulation and flotation component, and a multi-component catalytic oxidation component connected in sequence;

[0010] The storage tank assembly includes multiple wastewater storage tanks corresponding to various types of wastewater. The coagulation flotation assembly includes an oil scraper and a pressurized dissolved air flotation machine. The pressurized dissolved air flotation machine removes emulsified dissolved substances through pressurized gas. The oil scraper is arranged above the pressurized dissolved air flotation machine to remove suspended matter in the wastewater.

[0011] A catalytic chamber is provided in the multi-element catalytic oxidation assembly, and various types of catalytic oxidation components are provided in the catalytic chamber. Organic pollutants in various types of wastewater are degraded by the action of the catalytic oxidation components in the catalytic chamber.

[0012] Furthermore, the coagulation and flotation assembly also includes a flocculant dosing device and a sewage pump. The flocculant dosing device is connected to the pressurized dissolved air flotation machine to add flocculant to the pressurized dissolved air flotation machine, and the sewage pump discharges the waste gas in each wastewater storage tank into the pressurized dissolved air flotation machine.

[0013] The pressurized dissolved air flotation machine includes a flotation tank, a dissolved air water pump, a dissolved air tank, a releaser and an air compressor. The dissolved air water pump is connected to the flotation tank and the inlet end of the dissolved air tank, and is used to return part of the wastewater in the flotation tank to the dissolved air tank. The air compressor is connected to the dissolved air tank to send pressurized air into the dissolved air tank. The releaser is connected to the outlet end of the dissolved air tank and the flotation tank to send the pressurized wastewater back to the flotation tank.

[0014] Furthermore, the multi-component catalytic oxidation assembly includes a wastewater treatment tank, an electrocatalytic component and a photocatalytic component. The catalytic chamber is arranged inside the wastewater treatment tank. The interior of the wastewater treatment tank also includes a sewage bottom chamber and a clean water chamber. The anode and cathode components of the electrocatalytic component and the photocatalytic component are all arranged in the catalytic chamber.

[0015] Furthermore, the cathode member of the electrocatalytic component is a metal mesh, which includes a first metal mesh and a second metal mesh. The first metal mesh and the second metal mesh are arranged vertically inside the wastewater treatment tank, with the first metal mesh located below the second metal mesh. The bottom of the first metal mesh is a sewage bottom cavity, the space between the first metal mesh and the second metal mesh is a catalytic cavity, and the top of the second metal mesh is a clean water cavity.

[0016] The inner wall of the catalytic chamber is fixedly connected to a first bracket and a second bracket arranged vertically and insulated, and a plurality of anode members of the electrocatalytic components distributed at an angle are arranged between the first bracket and the second bracket;

[0017] The photocatalytic component includes an ultraviolet light-emitting tube. The inner wall of the catalytic chamber is provided with a first layer of fixed blocks and a second layer of fixed blocks arranged vertically. Multiple groups of ultraviolet light-emitting tubes distributed at an angle are provided between the first layer of fixed blocks and the second layer of fixed blocks.

[0018] The distance between the first bracket and the second bracket is smaller than the distance between the first layer fixing block and the second layer fixing block.

[0019] Furthermore, a driving mechanism is provided on the lower surface of the wastewater treatment tank, which is transmission-connected to a first stirring blade, a second stirring blade and a turning auger. The first stirring blade, the second stirring blade and the turning auger are all arranged in the sewage bottom cavity, and the turning auger is arranged between the first stirring blade and the second stirring blade.

[0020] Furthermore, the driving mechanism includes a support bracket fixedly connected to the lower surface of the wastewater treatment tank, a driving motor and a bearing seat. The output shaft of the driving motor is transmission-connected to a worm, one end of the worm is rotationally connected to the bearing seat, and the worm is transmission-connected to a worm wheel, and the worm wheel is transmission-connected to a driving shaft, and the lower end of the driving shaft is rotationally connected to the support bracket.

[0021] Furthermore, a first stabilizing frame and a second stabilizing frame are provided inside the wastewater treatment tank. The first stabilizing frame is provided on the upper surface of the first metal mesh, and the second stabilizing frame is provided on the upper surface of the second metal mesh. The first stabilizing frame and the second stabilizing frame pass through the drive shaft in sequence.

[0022] Furthermore, the upper end of the drive shaft sequentially passes through the wastewater treatment tank, the first stabilizing frame, the second stabilizing frame, the first metal mesh and the second metal mesh and is fixedly connected to the limit block, the turning auger is fixedly connected to the outer lower end of the drive shaft, and the first stirring blade and the second stirring blade are both fixedly connected to the outer side of the drive shaft;

[0023] The outer fixed sleeve of the driving shaft is provided with a first scraping rod and a second scraping rod. The upper surface of the first scraping rod abuts against the lower surface of the first metal mesh, and the upper surface of the second scraping rod abuts against the lower surface of the second metal mesh.

[0024] Furthermore, the outside of the wastewater treatment tank is connected to a first sewage pipe, a second sewage pipe and a clean water pipe in sequence from bottom to top, and a pressure gauge and an ORP meter are provided on the outside of the wastewater treatment tank. The lower surface of the wastewater treatment tank is plugged with an inlet pipe connected to the sewage bottom chamber, and the lower surface of the wastewater treatment tank is provided with multiple groups of support legs in an array;

[0025] The upper surface of the wastewater treatment tank is also provided with a dosing mechanism, which includes a dosing bracket, a drug storage tank and an air pump. The drug storage tank is fixedly connected to the dosing bracket, and the lower end of the drug storage tank is connected to a drug outlet pipe, one end of the drug outlet pipe is connected to a drug guide pipe, one end of the drug guide pipe is connected to the catalytic chamber, and the air outlet pipe of the air pump is connected to the drug guide pipe;

[0026] A first one-way valve is provided on the air outlet pipe of the air pump, a second one-way valve is provided on the end of the drug guide pipe away from the drug outlet pipe, a flow control valve is provided on one end of the drug outlet pipe, and a drug inlet pipe is provided on the upper outer end of the drug storage tank.

[0027] In a second aspect, the present invention further provides a method for pre-treating multiple types of wastewater, using the multiple types of wastewater pre-treatment device described above, and specifically comprising the following steps:

[0028] S1: Each type of waste gas is discharged into the corresponding wastewater storage tank;

[0029] S2: The wastewater from the wastewater storage tank enters the coagulation and flotation components to remove emulsified dissolved matter and suspended matter;

[0030] S3: After the coagulation and flotation components, the wastewater enters the multi-catalytic oxidation component, where the organic pollutants are degraded through the action of various types of catalytic oxidation components in the catalytic cavity.

[0031] The present invention provides a multi-type wastewater pretreatment device and method, which has at least the following beneficial effects:

[0032] (1) The present invention collects and treats various types of wastewater separately, and achieves rapid degradation of organic compounds through various types of catalytic oxidation components, ensuring that the water quality at the effluent end is continuously up to standard.

[0033] (2) The coupling of electrocatalysis, photocatalysis and chemical catalysis in the wastewater treatment tank of the multi-catalytic oxidation assembly of the present invention improves the efficiency of wastewater treatment, and the design of the electrocatalytic component, photocatalytic component and dosing mechanism is compact, occupies less space, and reduces equipment cost.

[0034] (3) In the wastewater treatment tank of the present invention, the driving mechanism, the turning auger and the stirring blades cooperate with each other, and the worm on the driving shaft is driven by the driving motor to drive the worm, and then the driving shaft drives the turning auger and the stirring blades to stir the sewage in the sewage bottom cavity, thereby avoiding the deposition of impurities in the wastewater, thereby reducing the treatment effect on the sewage, improving the fluidity of the sewage, and thereby improving the catalytic oxidation efficiency of the wastewater; the first metal mesh, the second metal mesh, the first stable frame, the second stable frame, the first scraping rod and the second scraping rod cooperate with each other, and the driving shaft drives the scraping rod to scrape off impurities attached to the first metal mesh and the second metal mesh, thereby avoiding impurities clogging the mesh holes, thereby improving the catalytic oxidation efficiency of the sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is an overall structural diagram of a multi-type wastewater pretreatment device provided by the present invention;

[0036] Figure 2 A schematic structural diagram of a coagulation-air flotation assembly according to an embodiment of the present invention;

[0037] Figure 3 A schematic structural diagram of a wastewater treatment tank according to an embodiment of the present invention;

[0038] Figure 4 A schematic cross-sectional view of the internal structure of a wastewater treatment tank according to an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the structure of various components in a catalytic chamber according to an embodiment of the present invention;

[0040] Figure 6 A schematic structural diagram of a drug delivery mechanism according to an embodiment of the present invention;

[0041] Figure 7 A schematic structural diagram of a driving mechanism according to an embodiment of the present invention;

[0042] Figure 8 A schematic flow chart of a multi-type wastewater pretreatment method provided by the present invention.

[0043] Description of reference numerals:

[0044] 1-storage tank assembly, 2-coagulation flotation assembly, 21-oil scraper, 221-flotation tank, 222-dissolved air water pump, 223-dissolved air tank, 224-releaser, 225-air compressor, 23-flocculant dosing equipment, 24-sewage pump, 3-multi-catalytic oxidation assembly, 31-wastewater treatment tank, 311-catalytic chamber, 312-sewage bottom chamber, 3121-first stirring blade, 3122-second stirring blade, 3123-turning auger, 313-water purification chamber, 314-first bracket, 315-second bracket, 316-first layer fixing block, 318-first stable frame, 319-second stable frame, 321-anode component, 3221-first metal mesh, 32 22-second metal mesh, 331-ultraviolet light-emitting tube, 34-driving mechanism, 340-driving shaft, 3401-first scraping rod, 3402-second scraping rod, 341-support bracket, 342-driving motor, 3421-output shaft, 3422-worm, 3423-worm gear, 3424-limiting block, 343-bearing seat, 35-first sewage pipe, 36-second sewage pipe, 37-pure water pipe, 38-dosing mechanism, 381-dosing bracket, 382-drug storage tank, 3821-drug outlet pipe, 3822-drug guide pipe, 3823-drug inlet pipe, 383-air pump, 3831-air outlet pipe, 3832-first one-way valve, 3833-second one-way valve. DETAILED DESCRIPTION

[0045] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a," "an," "the," and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, and unless the context clearly indicates otherwise, "a plurality" generally includes at least two.

[0047] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0048] At port terminals, wastewater treatment stations primarily receive acidic and alkaline wastewater from chemical storage tank areas, chemical wastewater, and ship tank washwater. This wastewater exhibits the following characteristics: complex composition, significant fluctuations in quality, poor biodegradability, high oil content, high concentrations of oily organic nitrogen and iron ions, high color and turbidity, and high suspended solids concentrations.

[0049] Therefore, it is necessary to consider the specific characteristics of wastewater and design a comprehensive treatment system that can handle multiple types of wastewater. This multi-type wastewater treatment system can be classified and collected for subsequent treatment. At the same time, classified collection can also avoid cross-contamination of various types of wastewater; after classified collection, it can be classified and treated first, and then centralized. For example, acid-base wastewater has a low concentration of pollutants, but is strongly acidic and has a high chloride ion concentration. It only needs to be treated by acid-base neutralization process to be close to the discharge water quality; chemical wastewater is collected separately to avoid similar miscibility with oily wastewater. The oily wastewater is first subjected to oil separation and flotation pretreatment, and the chemical wastewater is homogenized before entering oxidation pretreatment to remove pollutants with high biological toxicity in the wastewater, such as benzene and toluene, to ensure the stable operation of the biochemical system.

[0050] like Figure 1 As shown, the present invention provides a pretreatment device for multiple types of wastewater, including chemical wastewater and oily wastewater. The pretreatment device includes: a storage tank component 1, a coagulation and flotation component 2, and a multi-component catalytic oxidation component 3 connected in sequence;

[0051] The storage tank assembly 1 includes multiple wastewater storage tanks corresponding to various types of wastewater. The coagulation flotation assembly 2 includes an oil scraper 21 and a pressurized dissolved air flotation machine. The pressurized dissolved air flotation machine removes emulsified and dissolved substances through pressurized gas. The oil scraper 21 is arranged above the pressurized dissolved air flotation machine to remove suspended matter in the wastewater.

[0052] A catalytic chamber 311 is provided in the multi-element catalytic oxidation assembly 3 , and various types of catalytic oxidation components are provided in the catalytic chamber 311 . Organic pollutants in various types of wastewater are degraded by the catalytic oxidation components in the catalytic chamber.

[0053] The present invention collects and treats various types of wastewater separately, and in particular, achieves rapid degradation of organic compounds through various types of catalytic oxidation components, ensuring that the water quality at the effluent end is continuously up to standard.

[0054] like Figure 2 As shown, the coagulation flotation assembly 2 further includes a flocculant dosing device 23 and a sewage pump 24. The flocculant dosing device 23 is connected to the pressurized dissolved air flotation machine to add flocculant to the pressurized dissolved air flotation machine, and the sewage pump 24 discharges the waste gas in each wastewater storage tank into the pressurized dissolved air flotation machine;

[0055] The pressurized dissolved air flotation machine includes a flotation tank 221, a dissolved air water pump 222, an air dissolving tank 223, a releaser 224 and an air compressor 225. The dissolved air water pump 222 is connected to the inlet end of the flotation tank 221 and the air dissolving tank 223, and is used to return part of the wastewater in the flotation tank 221 to the air dissolving tank 223. The air compressor 225 is connected to the air dissolving tank 223 to send pressurized air into the air dissolving tank 223. The releaser 224 is connected to the outlet end of the air dissolving tank 223 and the flotation tank 221 to send the pressurized wastewater back to the flotation tank 221.

[0056] The coagulation flotation assembly of the present invention generates a large number of tiny bubbles in water by pressurized dissolved air. The bubbles adhere to solid or liquid particles in the wastewater and rise to the water surface by buoyancy, thereby achieving solid-liquid or liquid-liquid separation. The flotation process can fully remove emulsified oil and dissolved oil in the wastewater.

[0057] The flocculant in the flocculant dosing equipment is mixed with the pressurized wastewater in the dissolved air tank in the flotation tank. The pressure in the flotation tank is reduced, and the supersaturated air is released to form tiny bubbles. These bubbles adhere to solid or liquid particles in the wastewater with a density close to that of water, forming a floating body with a density less than that of water. Under the action of buoyancy, the floating body floats to the water surface for solid-liquid or liquid-liquid separation.

[0058] The coagulation flotation component of the present invention enhances the oil removal effect by coagulation flotation according to the characteristics that wastewater contains more floating oil and dissolved oil, thereby doubling the oil removal amount and reducing the processing pressure of the back-end multi-component catalytic oxidation component.

[0059] like Figure 3-Figure 7 As shown, the multi-element catalytic oxidation assembly 3 includes a wastewater treatment tank 31, an electrocatalytic component and a photocatalytic component. The catalytic chamber 311 is arranged inside the wastewater treatment tank 31. The interior of the wastewater treatment tank 31 also includes a sewage bottom chamber 312 and a clean water chamber 313. The anode component 321 and cathode component of the electrocatalytic component and the photocatalytic component are all arranged in the catalytic chamber 311.

[0060] The cathode component of the electrocatalytic component is a metal mesh, which includes a first metal mesh 3221 and a second metal mesh 3222. The first metal mesh 3221 and the second metal mesh 3222 are arranged vertically inside the wastewater treatment tank 31. The first metal mesh 3221 is located below the second metal mesh 3222. Below the first metal mesh 3221 is the sewage bottom cavity 312, between the first metal mesh 3221 and the second metal mesh 3222 is the catalytic cavity 311, and above the second metal mesh 3222 is the clean water cavity 313.

[0061] The interior of the wastewater treatment tank is divided into a sewage bottom chamber, a catalytic chamber, and a clean water chamber by a first metal mesh and a second metal mesh. The first and second metal meshes not only screen out suspended and floating matter in the wastewater, but also serve as cathodes for electrocatalysis.

[0062] The inner wall of the catalytic chamber 311 is fixedly connected to a vertically arranged and insulated first bracket 314 and second bracket 315. Multiple groups of anode components 321 of the electrocatalytic component are arranged between the first bracket 314 and the second bracket 315. Both the first bracket and the second bracket can be configured as hexagonal brackets, and the anode components of the electrocatalytic component are fixedly connected between the upper and lower groups of hexagonal brackets.

[0063] The number of anode components can be set according to different application scenarios. Each group of anode components is distributed at an angle in the circumferential direction inside the catalytic chamber to increase the contact area with the wastewater in the catalytic chamber and improve the degradation effect of the wastewater.

[0064] The material of the anode component can be selected from metal oxides (Ti oxides), etc., which can show good electrocatalytic activity and stability under oxygen evolution conditions. The material of the metal mesh can be selected from Ti. By setting up an electrocatalytic component, the wastewater is oxidized, specifically: hydroxyl radicals are generated in the wastewater, and under the control of given reaction conditions and operating parameters, rapid chemical reactions between the hydroxyl radicals and the functional groups of the pollutants are induced, such as addition and substitution reactions, to achieve efficient and selective degradation of chromogenic groups such as C=C and C=O, as well as highly toxic and difficult-to-biodegrade substances such as aromatic hydrocarbons and heterocyclic rings.

[0065] The photocatalytic component includes ultraviolet light-emitting tubes 331. The inner wall of the catalytic chamber 311 is provided with a vertically arranged first layer of fixing blocks 316 and a second layer of fixing blocks (not shown in the figure). Between the first layer of fixing blocks 316 and the second layer of fixing blocks are multiple groups of ultraviolet light-emitting tubes 331 distributed at an angle.

[0066] The distance between the first bracket 314 and the second bracket 315 is smaller than the distance between the first layer fixing block 316 and the second layer fixing block.

[0067] An ultraviolet light-emitting tube is set between the first and second fixed blocks. Under the action of ultraviolet light, the pollutants in the wastewater undergo direct photolysis and indirect photolysis, coupled with electrocatalysis to achieve deep treatment of pollutants in the wastewater.

[0068] A driving mechanism 34 is also provided on the lower surface of the wastewater treatment tank 31, and the driving mechanism 34 is transmission-connected to the first stirring blade 3121, the second stirring blade 3122 and the turning auger 3123. The first stirring blade 3121, the second stirring blade 3122 and the turning auger 3123 are all arranged in the sewage bottom cavity 312, and the turning auger 3123 is arranged between the first stirring blade 3121 and the second stirring blade 3122.

[0069] The driving mechanism facilitates the rotation of the stirring blades and the turning auger, thereby improving the fluidity of the wastewater in the wastewater treatment tank and avoiding the problem of reduced treatment effect due to wastewater sedimentation.

[0070] The driving mechanism 34 includes a support bracket 341 fixedly connected to the lower surface of the wastewater treatment tank 31, a driving motor 342 and a bearing seat 343. The output shaft 3421 of the driving motor 342 is transmission-connected to a worm 3422. One end of the worm 3422 is rotationally connected to the bearing seat 343, and the worm 3422 is transmission-connected to a worm gear 3423. The worm gear 3423 is transmission-connected to a driving shaft 340. The lower end of the driving shaft 340 is rotationally connected to the support bracket 341.

[0071] A first stabilizing frame 318 and a second stabilizing frame 319 are also provided inside the wastewater treatment tank 31. The first stabilizing frame 318 is provided on the upper surface of the first metal mesh 3221, and the second stabilizing frame 319 is provided on the upper surface of the second metal mesh 3222. The first stabilizing frame 318 and the second stabilizing frame 319 pass through the drive shaft 340 in sequence.

[0072] The upper end of the drive shaft 340 sequentially passes through the wastewater treatment tank 31, the first stabilizing frame 318, the second stabilizing frame 319, the first metal mesh 3221, and the second metal mesh 3222, and is fixedly connected to the limit block 3424. The turning auger 3123 is fixedly connected to the lower end of the outer side of the drive shaft 340. The first stirring blade 3121 and the second stirring blade 3122 are both fixedly connected to the outer side of the drive shaft 340.

[0073] The first and second stabilizing frames improve the stability of the drive shaft during rotation, ensuring the efficient agitation of the wastewater by the mixing blades and the turning auger. They also enhance the stability of the first and second metal meshes, preventing deformation during use that could affect wastewater treatment efficiency.

[0074] The outer fixed sleeve of the driving shaft 340 is provided with a first scraping rod 3401 and a second scraping rod 3402 . The upper surface of the first scraping rod 3401 abuts against the lower surface of the first metal mesh 3221 , and the upper surface of the second scraping rod 3402 abuts against the lower surface of the second metal mesh 3222 .

[0075] The first scraping rod and the second scraping rod are sleeved on the outside of the driving shaft. Through the rotation of the driving shaft, the first scraping rod and the second scraping rod are driven to clean the suspended matter and impurities on the surface of the first metal mesh and the second metal mesh, so as to avoid clogging the mesh holes of the first metal mesh and the second metal mesh and affecting the wastewater treatment efficiency.

[0076] The outside of the wastewater treatment tank 31 is connected to the first sewage pipe 35, the second sewage pipe 36 and the clean water pipe 37 in order from bottom to top. A pressure gauge and an ORP meter are installed on the outside of the wastewater treatment tank 31. The lower surface of the wastewater treatment tank is plugged with an inlet pipe connected to the sewage bottom chamber. The lower surface of the wastewater treatment tank is equipped with multiple groups of support legs in an array.

[0077] A dosing mechanism 38 is also provided on the upper surface of the wastewater treatment tank 31. The dosing mechanism 38 includes a dosing bracket 381, a drug storage tank 382 and an air pump 383. The drug storage tank 382 is fixedly connected to the dosing bracket 381, and the lower end of the drug storage tank 382 is connected to a drug outlet pipe 3821, one end of the drug outlet pipe 3821 is connected to a drug guide pipe 3822, one end of the drug guide pipe 3822 is connected to the catalytic chamber 311, and the air outlet pipe 3831 of the air pump 383 is connected to the drug guide pipe 3822.

[0078] The catalyst can be easily introduced into the catalytic cavity through the air pump, thereby catalyzing the pollutants in the wastewater and improving the degradation effect of the wastewater.

[0079] A first one-way valve 3832 is provided on the air outlet pipe 3831 of the air pump 383, a second one-way valve 3833 is provided on the end of the drug guide tube 3822 away from the drug outlet pipe 3821, a flow control valve is provided at one end of the drug outlet pipe 3821, and a drug inlet pipe 3823 is provided on the outer upper end of the drug storage tank 382.

[0080] The first and second one-way valves prevent both wastewater and catalyst backflow, improving catalyst delivery efficiency. A liquid level sensor can also be installed within the tank to monitor the catalyst capacity and transmit a capacity signal to the control terminal, controlling catalyst filling within the tank.

[0081] After the wastewater enters the multi-catalytic oxidation component through the water inlet pipe, the wastewater first fills the sewage bottom cavity in the wastewater treatment tank, then overflows into the catalytic cavity and the clean water cavity in turn, and finally is discharged through the clean water pipe into the next process.

[0082] The wastewater undergoes a degradation process in the wastewater treatment tank, which specifically includes: the drive motor drives the worm and drives the worm wheel to rotate, so that the drive shaft drives the turning auger and the stirring blades to stir the wastewater in the sewage bottom chamber, maintain the fluidity of the wastewater, and also facilitate the filtering of some suspended matter when the wastewater passes through the second metal mesh into the catalytic chamber.

[0083] Within the catalytic chamber, the difficult-to-degrade organic matter and toxic substances contained in the wastewater are treated through three coupled methods. First, ultraviolet light generated by multiple sets of ultraviolet light-emitting tubes irradiates the wastewater, thereby decomposing the organic matter in the wastewater. Second, the electrocatalytic component performs electrolysis, generating hydroxyl radicals, which, through their strong oxidizing function, secondary degrade the organic matter in the wastewater. Third, an air pump increases the pressure in the drug guide tube, forcing the catalyst from the drug storage tank into the wastewater treatment tank. The catalyst enters the catalytic chamber and catalyzes the degradation of organic matter in the wastewater. The coupled electrocatalysis, photocatalysis, and chemical catalysis within the catalytic chamber improves wastewater treatment efficiency. The compact design of the electrocatalytic component, photocatalytic component, and drug delivery mechanism reduces space and reduces equipment costs.

[0084] like Figure 8 As shown, the present invention also provides a method for pre-treating multiple types of wastewater, which uses the above-mentioned multiple types of wastewater pre-treatment device and specifically includes the following steps:

[0085] S1: Each type of waste gas is discharged into the corresponding wastewater storage tank;

[0086] S2: The wastewater from the wastewater storage tank enters the coagulation and flotation components to remove emulsified dissolved matter and suspended matter;

[0087] S3: After the coagulation and flotation components, the wastewater enters the multi-catalytic oxidation component, where the organic pollutants are degraded through the action of various types of catalytic oxidation components in the catalytic cavity.

[0088] The present invention provides a multi-type wastewater pretreatment device and method, which has at least the following beneficial effects:

[0089] (1) The present invention collects and treats various types of wastewater separately, and achieves rapid degradation of organic compounds through various types of catalytic oxidation components, ensuring that the water quality at the effluent end is continuously up to standard.

[0090] (2) The coupling of electrocatalysis, photocatalysis and chemical catalysis in the wastewater treatment tank of the multi-catalytic oxidation assembly of the present invention improves the efficiency of wastewater treatment, and the design of the electrocatalytic component, photocatalytic component and dosing mechanism is compact, occupies less space, and reduces equipment cost.

[0091] (3) In the wastewater treatment tank of the present invention, the driving mechanism, the turning auger and the stirring blades cooperate with each other, and the worm on the driving shaft is driven by the driving motor to drive the worm, and then the driving shaft drives the turning auger and the stirring blades to stir the sewage in the sewage bottom cavity, thereby avoiding the deposition of impurities in the wastewater, thereby reducing the treatment effect on the sewage, improving the fluidity of the sewage, and thereby improving the catalytic oxidation efficiency of the wastewater; the first metal mesh, the second metal mesh, the first stable frame, the second stable frame, the first scraping rod and the second scraping rod cooperate with each other, and the driving shaft drives the scraping rod to scrape off impurities attached to the first metal mesh and the second metal mesh, thereby avoiding impurities clogging the mesh holes, thereby improving the catalytic oxidation efficiency of the sewage.

[0092] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the invention. Thus, the present invention is intended to include such changes and modifications as fall within the scope of the claims and their equivalents.

Claims

1. A pretreatment device for multiple types of wastewater, characterized in that: The various types of wastewater include chemical wastewater and oily wastewater. The pretreatment device includes: a storage tank component, a coagulation and flotation component and a multi-component catalytic oxidation component connected in sequence; The storage tank assembly includes multiple wastewater storage tanks corresponding to various types of wastewater, and the wastewater in each wastewater storage tank enters the coagulation flotation assembly; The multi-element catalytic oxidation assembly includes a wastewater treatment tank, an electrocatalytic component, and a photocatalytic component. The multi-element catalytic oxidation assembly is provided with a catalytic chamber, which is arranged inside the wastewater treatment tank. The interior of the wastewater treatment tank also includes a sewage bottom chamber and a clean water chamber. The anode and cathode components of the electrocatalytic component and the photocatalytic component are all arranged in the catalytic chamber. A dosing mechanism is also provided on the upper surface of the wastewater treatment tank. The cathode of the electrocatalytic component is a metal mesh, which includes a first metal mesh and a second metal mesh. The first metal mesh and the second metal mesh are arranged vertically inside the wastewater treatment tank, with the first metal mesh located below the second metal mesh. The bottom of the first metal mesh is a sewage bottom cavity, the space between the first and second metal meshes is a catalytic cavity, and the top of the second metal mesh is a clean water cavity. The inner wall of the catalytic chamber is fixedly connected to a first bracket and a second bracket arranged vertically and insulated, and a plurality of anode members of the electrocatalytic components distributed at an angle are arranged between the first bracket and the second bracket; The photocatalytic component includes an ultraviolet light emitting tube; The lower surface of the wastewater treatment tank is also provided with a driving mechanism, which is transmission-connected to the first stirring blade, the second stirring blade and the turning auger, and the first stirring blade, the second stirring blade and the turning auger are all arranged in the sewage bottom cavity; The driving mechanism includes a driving motor, the output shaft of the driving motor is connected to a worm, the worm is connected to a worm wheel, the worm wheel is connected to a driving shaft, and the outer fixed sleeve of the driving shaft is provided with a first scraping rod and a second scraping rod, the upper surface of the first scraping rod is in contact with the lower surface of the first metal mesh, and the upper surface of the second scraping rod is in contact with the lower surface of the second metal mesh.

2. The multi-type wastewater pretreatment device according to claim 1, characterized in that: The coagulation flotation component includes an oil scraper and a pressurized dissolved air flotation machine. The pressurized dissolved air flotation machine removes emulsified dissolved substances through pressurized gas. The oil scraper is arranged above the pressurized dissolved air flotation machine to remove suspended matter in the wastewater.

3. The multi-type wastewater pretreatment device according to claim 2, characterized in that: The coagulation flotation component also includes a flocculant dosing device and a sewage pump. The flocculant dosing device is connected to the pressurized dissolved air flotation machine to add flocculant to the pressurized dissolved air flotation machine. The sewage pump discharges the wastewater in each wastewater storage tank into the pressurized dissolved air flotation machine; the pressurized dissolved air flotation machine includes a flotation tank, a dissolved air water pump, a dissolved air tank, a releaser and an air compressor. The dissolved air water pump is connected to the flotation tank and the inlet end of the dissolved air tank to return part of the wastewater in the flotation tank to the dissolved air tank. The air compressor is connected to the dissolved air tank to send pressurized air into the dissolved air tank. The releaser is connected to the outlet end of the dissolved air tank and the flotation tank to send the pressurized wastewater back to the flotation tank.

4. The multi-type wastewater pretreatment device according to claim 1, characterized in that: The inner wall of the catalytic chamber is provided with a first layer of fixed blocks and a second layer of fixed blocks arranged vertically, and multiple groups of ultraviolet light-emitting tubes distributed at an angle are provided between the first layer of fixed blocks and the second layer of fixed blocks; The distance between the first bracket and the second bracket is smaller than the distance between the first layer fixing block and the second layer fixing block.

5. The multi-type wastewater pretreatment device according to claim 1, characterized in that: The material turning auger is arranged between the first stirring blade and the second stirring blade.

6. The multi-type wastewater pretreatment device according to claim 1, characterized in that: The driving mechanism also includes a support bracket and a bearing seat fixedly connected to the lower surface of the wastewater treatment tank. One end of the worm is rotatably connected to the bearing seat, and the lower end of the drive shaft is rotatably connected to the support bracket.

7. The multi-type wastewater pretreatment device according to claim 1, characterized in that: A first stabilizing frame and a second stabilizing frame are also provided inside the wastewater treatment tank. The first stabilizing frame is provided on the upper surface of the first metal mesh, and the second stabilizing frame is provided on the upper surface of the second metal mesh. The drive shaft passes through the first stabilizing frame and the second stabilizing frame in sequence.

8. The multi-type wastewater pretreatment device according to claim 7, characterized in that: The upper end of the drive shaft passes through the wastewater treatment tank, the first stable frame, the second stable frame, the first metal mesh and the second metal mesh in sequence and is fixedly connected to the limiting block. The turning auger is fixedly connected to the lower end of the outer side of the drive shaft, and the first stirring blade and the second stirring blade are both fixedly connected to the outer side of the drive shaft.

9. The multi-type wastewater pretreatment device according to claim 1, characterized in that: The outside of the wastewater treatment tank is connected to the first sewage pipe, the second sewage pipe and the clean water pipe in sequence from bottom to top, and a pressure gauge and an ORP meter are set on the outside of the wastewater treatment tank. The lower surface of the wastewater treatment tank is plugged with an inlet pipe connected to the sewage bottom chamber, and the lower surface of the wastewater treatment tank is arrayed with multiple groups of legs; The drug dispensing mechanism includes a drug dispensing bracket, a drug storage tank and an air pump. The drug storage tank is fixedly connected to the drug dispensing bracket, and the lower end of the drug storage tank is connected to a drug outlet pipe, one end of the drug outlet pipe is connected to a drug guide pipe, one end of the drug guide pipe is connected to the catalytic chamber, and the air outlet pipe of the air pump is connected to the drug guide pipe; A first one-way valve is provided on the air outlet pipe of the air pump, a second one-way valve is provided on the end of the drug guide pipe away from the drug outlet pipe, a flow control valve is provided on one end of the drug outlet pipe, and a drug inlet pipe is provided on the upper outer end of the drug storage tank.

10. A method for pre-treating multiple types of wastewater, characterized in that: The pretreatment device for multi-type wastewater according to any one of claims 1 to 9 specifically comprises the following steps: S1: Each type of wastewater is discharged into the corresponding wastewater storage tank; S2: The wastewater from each wastewater storage tank enters the coagulation flotation component to remove emulsified dissolved matter and suspended matter; S3: After the coagulation and flotation components, the wastewater enters the multi-catalytic oxidation component, where the organic pollutants are degraded through the action of various types of catalytic oxidation components in the catalytic cavity.

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