Zero-discharge staged purification treatment equipment for hazardous waste chemical sewage

Abstract

The invention discloses hazardous waste chemical sewage zero-discharge grading purification treatment equipment. The equipment comprises a pretreatment mechanism, a catalytic treatment mechanism, a grading precipitation separation mechanism, a biological treatment mechanism and a membrane separation mechanism which are communicated in sequence, the pretreatment mechanism comprises a grating blocking and filtering mechanism, the grating blocking and filtering mechanism comprises a grating blocking and filtering containing shell, a grating supporting ring shell which vertically extends is fixed in the grating blocking and filtering containing shell, a plurality of grating mounting grooves which are communicated inside and outside and vertically extend are formed in the side wall of the grating supporting ring shell, and filtering gratings are mounted in the grating mounting grooves; the equipment can quickly and effectively remove solid particles, colloids and other suspended solids in hazardous waste chemical sewage, and the grating deslagging mechanism can timely clean the filtering grating to keep the effective filtering capacity of the filtering grating; the catalytic treatment mechanism can be subjected to a series of oxidation reactions with organic pollutants in the wastewater, so that the organic pollutants are gradually decomposed into carbon dioxide, water and other harmless inorganic matters.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a zero-discharge graded purification treatment device for hazardous chemical sewage. Background Art

[0002] Hazardous waste (hazardous waste) chemical wastewater refers to wastewater containing dangerous and harmful substances generated in the chemical production process. Many chemical reactions will produce wastewater. For example, in the petrochemical industry, during the refining of crude oil, process links such as atmospheric and vacuum distillation and catalytic cracking will produce wastewater containing a large amount of organic matter (such as benzene, toluene, phenols, etc.). These organic substances have dangerous characteristics such as toxicity and flammability. Common organic substances in chemical wastewater include aromatic hydrocarbons (such as benzene, naphthalene, etc.), halogenated hydrocarbons (such as chloroform, carbon tetrachloride, etc.) and phenolic compounds. Benzene is a known carcinogen, and long-term exposure can lead to serious diseases such as leukemia. Halogenated hydrocarbons are highly toxic and can cause damage to the human nervous system, liver and other organs. Phenolic compounds are corrosive and highly toxic to aquatic organisms, which will affect the balance of the aquatic ecosystem;

[0003] The existing hazardous waste chemical wastewater treatment equipment is not comprehensive and thorough enough in removing these pollutants during the purification process, and needs further improvement and optimization. Summary of the invention

[0004] The object of the present invention is to provide a zero-discharge graded purification treatment device for hazardous waste chemical wastewater, which can purify hazardous waste chemical wastewater more thoroughly and comprehensively.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A zero-discharge graded purification treatment device for hazardous waste chemical sewage, comprising a pretreatment mechanism, a catalytic treatment mechanism, a graded sedimentation separation mechanism, a biological treatment mechanism and a membrane separation mechanism which are connected in sequence;

[0007] The pretreatment mechanism includes a grille filter mechanism, which includes a grille filter housing, a grille support ring housing extending vertically is fixed in the grille filter housing, and a plurality of grille installation grooves extending vertically and communicating with each other are provided on the side wall of the grille support ring housing, wherein a filter grille is installed in the grille installation groove;

[0008] A grid filter output ring shell is fixed at the bottom of the grid filter accommodation shell, and the bottom of the grid filter accommodation shell has a plurality of filter output holes connected to the inside of the grid filter output ring shell, and a grid filter external discharge pipe connected to the inside of the grid filter output ring shell is fixed at the bottom of the grid filter output ring shell;

[0009] A vertically extending grid filter input pipe is fixed on the top of the grid filter containing shell, and the lower end of the grid filter input pipe extends to the inside of the grid support ring shell;

[0010] The grille filter is connected to a regulating tank through an external discharge pipe, and the regulating tank is connected to a sedimentation tank through an external discharge pipe of the regulating tank. An external discharge pipe of the sedimentation tank connected to the inside of the sedimentation tank is fixed on the outside of the sedimentation tank.

[0011] The catalytic treatment mechanism comprises a horizontally arranged catalytic treatment flow pipe, in which a catalytic grid support shaft coaxially arranged therewith is rotatably connected, and a plurality of catalytic grids extending parallel to the axis of the catalytic grid support shaft are fixed to the outer side wall thereof;

[0012] The catalytic grid plate and the catalytic grid plate support shaft are both provided with a photocatalytic coating, and the photocatalytic coating is a titanium dioxide coating;

[0013] A plurality of ultraviolet lamp tubes are arranged on the side wall of the catalytic treatment flow pipe;

[0014] The graded sedimentation separation mechanism comprises a horizontally arranged sedimentation separation flow pipe, a reagent dosing mechanism is arranged on the side wall of the sedimentation separation flow pipe, and a sedimentation interception mechanism is arranged in the sedimentation separation flow pipe;

[0015] The biological treatment mechanism comprises an annular and hollow biological aerobic treatment ring shell, the inner side of which is provided with a biological anaerobic treatment containing shell, and the biological aerobic treatment ring shell is connected with the biological anaerobic treatment containing shell through a plurality of biological treatment delivery pipes;

[0016] A plurality of aerobic treatment partitions are fixed in the biological aerobic treatment ring shell. Two adjacent aerobic treatment partitions divide the inside of the biological aerobic treatment ring shell into an aerobic treatment chamber. A reinforced positive plate and a reinforced negative plate are fixed in the aerobic treatment chamber.

[0017] Preferably, the regulating tank is connected to a first reserved storage tank via a first reserved delivery pipe, and the regulating tank is connected to a second reserved storage tank via a second reserved delivery pipe;

[0018] A first reflux delivery pump is provided in the first reserved storage tank, and the output end of the first reflux delivery pump is connected to the inside of the regulating tank through a pipeline. A second reflux delivery pump is provided in the second reserved storage tank, and the output end of the second reflux delivery pump is connected to the inside of the regulating tank through a pipeline.

[0019] Note: The first reserved storage tank and the second reserved storage tank can temporarily store the sewage to be treated, which is convenient for overall adjustment.

[0020] Preferably, a grid slag discharge mechanism is provided in the grid filter housing, the grid slag discharge mechanism comprises a slag discharge mechanism support ring shell arranged inside the grid support ring shell, and a plurality of grid slag discharge scrapers are fixed on the outer side of the slag discharge mechanism support ring shell;

[0021] A slag discharge lifting fixed cylinder with an opening facing downward is fixed on the top of the grid filter housing, a slag discharge lifting fixed cylinder with an opening facing upward is slidably connected inside the slag discharge lifting fixed cylinder, and a slag discharge mechanism supporting ring shell is fixedly connected to the lower end of the slag discharge lifting sliding cylinder;

[0022] A slag discharge lifting and fixing cylinder is provided with a slag discharge lifting and fixing rod for driving the slag discharge lifting and fixing cylinder to move;

[0023] A slag collecting shell connected to the inside of the grid supporting ring shell is fixed at the bottom of the grid filtering and containing shell, and a slag external discharge pipe connected to the inside of the slag collecting shell is fixed at the lower end of the slag collecting shell.

[0024] Description: The grid slag discharge mechanism can clean the filter grid in time to keep the filter grid with good filtering performance.

[0025] Preferably, a catalytic treatment input pipe and a catalytic treatment output pipe coaxially arranged therewith are fixed at both ends of the catalytic treatment circulation pipe, and the catalytic treatment input pipe is connected to the external discharge pipe of the sedimentation tank;

[0026] A plurality of light accommodating shells are fixed on the outer side wall of the catalytic treatment flow tube, and the ultraviolet lamp tubes are fixed in the light accommodating shells;

[0027] The side wall of the catalytic treatment flow pipe is provided with a light penetration slot connected to the light containing shell, and a light sealing plate made of a transparent material is fixed in the light penetration slot;

[0028] An axis end support shell is provided at both ends of the catalyst grid support shaft in the catalytic treatment flow tube, and the axis end support shell is fixedly connected to the inner wall of the catalytic treatment flow tube through a plurality of radial guide plates;

[0029] A coaxial rotating drive shaft is fixed to the end of the catalyst grid support shaft. The rotating drive shaft extends to the inside of the shaft end support shell. A rotating drive motor for driving the rotating drive shaft to rotate is fixed inside the shaft end support shell.

[0030] Description: The catalytic treatment mechanism can undergo a series of oxidation reactions with organic pollutants in wastewater, gradually decomposing the organic pollutants into carbon dioxide, water and other harmless inorganic substances.

[0031] Preferably, a sedimentation separation input pipe and a sedimentation separation output pipe coaxially arranged therewith are fixed at both ends of the sedimentation separation flow pipe, and the sedimentation separation input pipe is connected to the catalytic treatment output pipe;

[0032] The reagent dosing mechanism comprises a dosing pipe matching hole which is arranged on the side wall of the sedimentation separation flow pipe and penetrates the pipe in the radial direction, and a reagent dosing pipe is slidably connected in the dosing pipe matching hole;

[0033] A reagent dosing nozzle is fixed on one end of the reagent dosing pipe located inside the sedimentation separation flow pipe;

[0034] A plurality of dosing tube drive accommodating cylinders extending radially are fixed to the outer side wall of the sedimentation separation circulation tube, and the reagent dosing tubes extend into each dosing tube drive accommodating cylinder one by one. A dosing tube drive accommodating cylinder is provided with a dosing tube drive rod for driving the reagent dosing tube to move.

[0035] Description: The chemical dosing mechanism can be used to spread flocculants into the sewage. The flocculants can chemically react with suspended particles and colloidal substances in the sewage to form larger flocs, which are convenient for subsequent separation and removal.

[0036] Preferably, the sedimentation interception mechanism comprises a plurality of sedimentation separation interception ring plates fixed on the inner side wall of the sedimentation separation flow pipe, and the plane of the sedimentation separation interception ring plates is arranged perpendicular to the axis of the sedimentation separation flow pipe;

[0037] An outer row tube fixing hole communicating with the inside and outside is provided on the side wall of the sedimentation separation flow pipe at the sedimentation separation interception ring plate, a sedimentation outer row tube with an opening facing inward is fixed in the outer row tube fixing hole, an outer row drive shaft is rotatably connected in the sedimentation outer row tube, and a sedimentation outer row spiral blade is provided on the outer row drive shaft;

[0038] An outer end of the sedimentation outer discharge cylinder is fixed with an outer discharge drive housing, an outer discharge drive shaft extends into the inner portion of the outer discharge drive housing, and an outer discharge drive motor for driving the outer discharge drive shaft to rotate is fixed in the outer discharge drive housing;

[0039] A sedimentation slag discharge pipe connected to the interior of the sedimentation outer discharge cylinder is fixed on the outside of the sedimentation outer discharge cylinder;

[0040] A scraper support ring rail extending circumferentially around the inner wall of the sedimentation separation circulation pipe is fixed, a scraper support slider is slidably connected to the scraper support ring rail, and a sedimentation cleaning scraper is fixed to the scraper support slider.

[0041] Description: Hazardous waste chemical wastewater continues to flow in the sedimentation separation flow pipe with floc sediment. When passing through the sedimentation separation interception ring plate, the sedimentation interception mechanism is used to intercept and separate these floc sediments. The sedimentation separation interception ring plate is a hollow mesh filter structure. The floc sediment in the hazardous waste chemical wastewater will be intercepted on the water-facing side of the sedimentation separation interception ring plate.

[0042] Preferably, an aeration conveying ring shell is fixed at the bottom of the biological aerobic treatment ring shell, the top of the aeration conveying ring shell is connected to the inside of the biological aerobic treatment ring shell through multiple aeration conveying through holes, multiple aeration conveying spherical shells are fixed in the aeration conveying ring shell, multiple aeration nozzles connected to the inside of the aeration conveying spherical shell are fixed on the outer side of the aeration conveying spherical shell, and the outer side of the aeration conveying spherical shell is provided with an aeration conveying pipe connected to the inside, and the aeration conveying pipe is provided with an aeration conveying one-way valve;

[0043] The biological aerobic treatment ring shell is filled with biological aerobic fillers, and the biological anaerobic treatment containing shell is filled with biological anaerobic fillers;

[0044] The outer side of the biological aerobic treatment ring shell is provided with a plurality of aerobic treatment input pipes connected to the interior thereof, and the bottom of the biological anaerobic treatment containing shell is fixed with an anaerobic treatment output pipe connected to the interior thereof;

[0045] The sedimentation separation output pipe is connected with the aerobic treatment input pipe.

[0046] Description: The aeration nozzle can generate tiny air bubbles, which flow from bottom to top through each aeration conveying hole into the biological aerobic treatment ring shell, providing dissolved oxygen for the hazardous waste and chemical sewage in the biological aerobic treatment ring shell.

[0047] Preferably, an aeration overflow pipe extending vertically and communicating with the interior of the biological aerobic treatment ring shell is fixed on the top of the ring shell, and an aeration overflow one-way valve is provided on the aeration overflow pipe.

[0048] Note: The excess air in the biological aerobic treatment ring shell can be discharged through the aeration overflow pipe to maintain the pressure balance inside and outside the biological aerobic treatment ring shell.

[0049] Preferably, the membrane separation mechanism comprises a membrane separation starting containment shell, an ultrafiltration containment ring shell is fixed to the outside of the membrane separation starting containment shell, a nanofiltration containment ring shell is fixed to the outside of the ultrafiltration containment ring shell, and a reverse osmosis containment ring shell is fixed to the outside of the nanofiltration containment ring shell;

[0050] A plurality of ultrafiltration filters connected to the interior of the ultrafiltration containing ring shell are fixed on the outer wall of the membrane separation starting containing shell, a plurality of nanofiltration filters connected to the interior of the nanofiltration containing ring shell are fixed on the outer wall of the ultrafiltration containing ring shell, and a plurality of reverse osmosis filters connected to the interior of the reverse osmosis containing ring shell are fixed on the outer wall of the nanofiltration containing ring shell.

[0051] Description: The membrane separation mechanism can effectively intercept large molecular organic matter and colloids, remove large molecular proteins, polysaccharides, oils and some high molecular polymers in chemical wastewater, and desalinate and remove small molecular organic matter.

[0052] Preferably, a membrane separation starting conveying pipe connected to the interior is fixed to the top of the membrane separation starting housing, an ultrafiltration interception output pipe connected to the interior is fixed to the bottom of the ultrafiltration housing ring housing, a nanofiltration interception output pipe connected to the interior is fixed to the bottom of the nanofiltration housing ring housing, and a plurality of membrane separation total output pipes connected to the interior are fixed to the outside of the reverse osmosis housing ring housing;

[0053] The anaerobic treatment output pipe is connected with the membrane separation starting delivery pipe.

[0054] Description: Independent ultrafiltration interception output pipe and nanofiltration interception output pipe are provided to facilitate the separate discharge and cleaning of sewage in the ultrafiltration containment ring shell and the nanofiltration containment ring shell.

[0055] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0056] 1. The present invention has a reasonable structural design, and the pretreatment mechanism has an efficient filtering and processing capability, which can quickly and effectively remove suspended matter such as solid particles and colloids in hazardous waste chemical sewage, and the grid slag discharge mechanism can clean the filter grid in time to maintain the effective filtering capability of the filter grid;

[0057] 2. The catalytic treatment mechanism of the present invention, when light irradiates the semiconductor photocatalyst, the electrons on the valence band of the semiconductor absorb light energy and are excited to the conduction band, thereby generating positively charged holes on the valence band and negatively charged high-energy electrons on the conduction band. These electrons and holes can trigger redox reactions of other substances in the solution. The photogenerated holes have strong oxidizing properties and can oxidize water molecules adsorbed on the surface of the catalyst to generate hydroxyl free radicals; the photogenerated electrons have reducing properties and can reduce oxygen molecules adsorbed on the surface of the catalyst to generate active oxygen species such as superoxide anion free radicals. These active oxygen species have extremely high oxidizing ability and can undergo a series of oxidation reactions with organic pollutants in wastewater, gradually decomposing the organic pollutants into carbon dioxide, water and other harmless inorganic substances.

[0058] 3. The biological treatment mechanism of the present invention can effectively decompose easily degradable organic matter in hazardous waste chemical sewage, such as sugars, proteins and fats, nutrients such as nitrogen and phosphorus, and some heavy metals.

[0059] 4. The membrane separation mechanism of the present invention can effectively intercept macromolecular organic matter and colloids, remove macromolecular proteins, polysaccharides, oils and some high molecular polymers present in chemical wastewater, and perform desalination and remove small molecular organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a schematic diagram of the overall layout of the present invention;

[0061] Figure 2 It is a structural schematic diagram of the grille filter mechanism of the present invention;

[0062] Figure 3 yes Figure 2 A top view of

[0063] Figure 4 It is a top view of the position-limiting matching sliding block of the present invention;

[0064] Figure 5 is a top view of the first reserved storage pool of the present invention;

[0065] Figure 6 It is a structural schematic diagram of the catalytic treatment mechanism of the present invention;

[0066] Figure 7 yes Figure 6 Left view of

[0067] Figure 8 It is a structural schematic diagram of the shaft end support shell of the present invention;

[0068] Fig. 9 It is a structural schematic diagram of the graded sedimentation separation mechanism of the present invention;

[0069] Fig.10 It is a structural schematic diagram of the drug dosing mechanism of the present invention;

[0070] Fig.11 It is a structural schematic diagram of the sedimentation interception mechanism of the present invention;

[0071] Fig.12 It is a schematic diagram of the structure of the biological treatment mechanism of the present invention;

[0072] Fig.13 yes Fig.12 A top view of

[0073] Fig.14 It is a structural schematic diagram of the aeration conveying ring shell of the present invention;

[0074] Fig.15 It is a schematic structural diagram of the membrane separation mechanism of the present invention.

[0075] In the figure, 10-pretreatment mechanism, 11-grid filter mechanism, 110-filter grid, 111-grid filter containing shell, 1110-grid filter input pipe, 112-grid support ring shell, 113-grid installation groove, 1130-grid limit slide groove, 1131-limit matching slider, 114-grid filter output ring shell, 1140-filter output hole, 1141-grid filter external pipe, 12-grid slag discharge mechanism, 120-grid slag scraper, 121-slag discharge mechanism support ring shell, 122-slag discharge lifting fixed cylinder, 123-slag discharge lifting sliding cylinder, 124-slag discharge lifting driving rod, 125-slag collection shell, 126-slag discharge external pipe, 14-regulating tank, 140-regulating tank external pipe, 15 - sedimentation tank, 150-sedimentation tank external discharge pipe, 16-first reserved storage tank, 160-first reserved delivery pipe, 161-first reflux delivery pump, 17-second reserved storage tank, 170-second reserved delivery pipe, 171-second reflux delivery pump, 20-catalytic treatment mechanism, 21-catalytic treatment circulation pipe, 211-catalytic grid support shaft, 212-catalytic grid, 213-light accommodating shell, 214-ultraviolet lamp, 2150-light penetration slot, 215-light sealing plate, 216-axial end support shell, 217-radial guide plate, 218-rotating drive shaft, 219-rotating drive motor, 22-catalytic treatment input pipe, 23-catalytic treatment output pipe, 30-grading sedimentation separation mechanism, 31-sedimentation Sedimentation separation circulation pipe, 311-sedimentation separation input pipe, 312-sedimentation separation output pipe, 32-agent dosing mechanism, 320-dosing pipe matching hole, 321-agent dosing pipe, 322-dosing pipe drive receiving tube, 323-dosing pipe driving rod, 33-sedimentation interception mechanism, 331-sedimentation separation interception ring plate, 332-sedimentation outer discharge tube, 3320-outer discharge tube fixing hole, 333-outer discharge drive shaft, 3330-sedimentation outer discharge spiral blade, 334-outer discharge drive receiving shell, 335-outer discharge drive motor, 336-sedimentation slag discharge pipe, 337-scraper support ring rail, 338-scraper support slider, 339-sedimentation cleaning scraper, 40-biological treatment mechanism, 401-biological aerobic filler, 402-biological Anaerobic filler, 403-aerobic treatment input pipe, 404-anaerobic treatment output pipe, 41-biological aerobic treatment ring shell, 410-aerobic treatment chamber, 411-aerobic treatment partition, 42-biological anaerobic treatment containing shell, 43-biological treatment delivery pipe, 441-reinforced positive plate, 442-reinforced negative plate, 45-aeration delivery ring shell, 450-aeration delivery through hole, 451-aeration delivery spherical shell, 452-aeration nozzle, 453-aeration delivery pipe, 4530-aeration delivery check valve, 50-membrane separation mechanism, 51-membrane separation starting containing shell, 510-membrane separation starting delivery pipe, 52-ultrafiltration containing ring shell, 520-ultrafiltration retention output pipe, 53-nanofiltration containing ring shell, 530-nanofiltration retention output pipe,54-reverse osmosis containing ring shell, 55-ultrafiltration filter, 56-nanofiltration filter, 57-reverse osmosis filter, 540-membrane separation total output pipe. DETAILED DESCRIPTION

[0076] Combine the following Figure 1 to Figure 15 The present invention is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front, and back directions mentioned below are consistent with the up, down, left, right, front, and back directions of the projection relationship of the respective main views or structural schematic diagrams themselves.

[0077] Embodiment 1:

[0078] A zero-discharge graded purification treatment equipment for hazardous chemical wastewater, such as Figure 1 As shown, it includes a pretreatment mechanism 10, a catalytic treatment mechanism 20, a graded precipitation separation mechanism 30, a biological treatment mechanism 40 and a membrane separation mechanism 50 which are connected in sequence;

[0079] like Figure 2 As shown, the pretreatment mechanism 10 includes a grille filter mechanism 11, and the grille filter mechanism 11 includes a grille filter housing 111, a grille support ring housing 112 extending vertically is fixed in the grille filter housing 111, and a plurality of grille installation grooves 113 communicating with each other and extending vertically are provided on the side wall of the grille support ring housing 112, and a filter grille 110 is installed in the grille installation groove 113;

[0080] A vertically extending grille limiting slide groove 1130 is provided on the inner side wall of the grille installation groove 113, and a limiting matching slider 1131 is fixed on the side of the filter grille 110, and the limiting matching slider 1131 is slidably connected in the grille limiting slide groove 1130;

[0081] A grid filter output ring shell 114 is fixed at the bottom of the grid filter housing 111. The bottom of the grid filter housing 111 has a plurality of filter output holes 1140 connected to the inside of the grid filter output ring shell 114. A grid filter external discharge pipe 1141 connected to the inside of the grid filter output ring shell 114 is fixed at the bottom of the grid filter output ring shell 114.

[0082] A vertically extending grid filter input pipe 1110 is fixed on the top of the grid filter containing shell 111, and the lower end of the grid filter input pipe 1110 extends to the inside of the grid support ring shell 112;

[0083] The grille filter external discharge pipe 1141 is connected to a regulating tank 14, and the regulating tank 14 is connected to a sedimentation tank 15 through a regulating tank external discharge pipe 140. The sedimentation tank 15 is fixed with an external discharge pipe 150 connected to the inside thereof on the outside.

[0084] like Figure 6As shown, the catalytic treatment mechanism 20 includes a horizontally arranged catalytic treatment flow pipe 21, in which a catalytic grid support shaft 211 arranged coaxially therewith is rotatably connected, and a plurality of catalytic grids 212 extending parallel to the axis of the catalytic grid support shaft 211 are fixed to the outer side wall thereof;

[0085] The catalytic grid plate 212 and the catalytic grid plate support shaft 211 are both provided with a photocatalytic coating, and the photocatalytic coating is a titanium dioxide coating;

[0086] like Figure 7 As shown, a plurality of ultraviolet lamp tubes 214 are provided on the side wall of the catalytic treatment flow tube 21;

[0087] like Fig. 9 As shown, the graded sedimentation separation mechanism 30 includes a horizontally arranged sedimentation separation flow pipe 31, a reagent dosing mechanism 32 is provided on the side wall of the sedimentation separation flow pipe 31, and a sedimentation interception mechanism 33 is provided in the sedimentation separation flow pipe 31;

[0088] like Fig.12 As shown, the biological treatment mechanism 40 includes an annular and hollow biological aerobic treatment ring shell 41, and a biological anaerobic treatment containing shell 42 is provided inside the biological aerobic treatment ring shell 41. The biological aerobic treatment ring shell 41 and the biological anaerobic treatment containing shell 42 are connected to each other through a plurality of biological treatment delivery pipes 43.

[0089] A plurality of aerobic treatment partitions 411 are fixed in the biological aerobic treatment ring shell 41 . Two adjacent aerobic treatment partitions 411 divide the interior of the biological aerobic treatment ring shell 41 into an aerobic treatment chamber 410 . A reinforced positive electrode plate 441 and a reinforced negative electrode plate 442 are fixed in the aerobic treatment chamber 410 .

[0090] like Figure 6 As shown, the two ends of the catalytic treatment circulation pipe 21 are respectively fixed with a catalytic treatment input pipe 22 and a catalytic treatment output pipe 23 arranged coaxially therewith, and the catalytic treatment input pipe 22 is connected to the sedimentation tank external discharge pipe 150;

[0091] like Figure 7 As shown, a plurality of light accommodating shells 213 are fixed to the outer wall of the catalytic treatment flow tube 21, and the ultraviolet lamp tube 214 is fixed in the light accommodating shell 213;

[0092] The side wall of the catalytic treatment flow pipe 21 is provided with a light penetration slot 2150 which is in communication with the light containing shell 213, and a light sealing plate 215 made of a transparent material is fixed in the light penetration slot 2150;

[0093] like Figure 8As shown, shaft end support shells 216 are provided at both ends of the catalyst grid support shaft 211 in the catalytic treatment flow tube 21, and the shaft end support shells 216 are fixedly connected to the inner wall of the catalytic treatment flow tube 21 through a plurality of radial guide plates 217;

[0094] A coaxial rotating drive shaft 218 is fixed to the end of the catalyst grid support shaft 211. The rotating drive shaft 218 extends to the inside of the shaft end support shell 216. A rotating drive motor 219 is fixed inside the shaft end support shell 216 for driving the rotating drive shaft 218 to rotate.

[0095] The rotary drive motor 219 is a motor of the prior art, and the output shaft of the rotary drive motor 219 drives the rotary drive shaft 218 to rotate through gear transmission.

[0096] like Fig. 9 As shown, the two ends of the sedimentation separation flow pipe 31 are respectively fixed with a sedimentation separation input pipe 311 and a sedimentation separation output pipe 312 arranged coaxially therewith, and the sedimentation separation input pipe 311 is connected to the catalytic treatment output pipe 23;

[0097] like Fig.10 As shown, the reagent dosing mechanism 32 includes a dosing pipe matching hole 320 disposed on the side wall of the sedimentation separation flow pipe 31 and penetrating along the radial direction thereof, and a reagent dosing pipe 321 is slidably connected in the dosing pipe matching hole 320;

[0098] A reagent dosing nozzle 3210 is fixed to one end of the reagent dosing pipe 321 located inside the sedimentation separation circulation pipe 31;

[0099] The reagent dosing pipes 321 are arranged in a circle around the sedimentation separation circulation pipe 31 as a group, and multiple groups of reagent dosing pipes 321 are arranged along the axis direction of the sedimentation separation circulation pipe 31;

[0100] A plurality of dosing tube drive accommodating cylinders 322 extending radially are fixed to the outer wall of the sedimentation separation circulation pipe 31, and the reagent dosing tubes 321 extend into each dosing tube drive accommodating cylinder 322 one by one. The dosing tube drive accommodating cylinder 322 is provided with a dosing tube drive rod 323 for driving the dosing tube 321 to move.

[0101] The dosing tube driving rod 323 is an electrically controlled telescopic rod of the prior art, the outer rod end of the dosing tube driving rod 323 is fixedly connected to the inner end of the dosing tube driving accommodating cylinder 322 , and the inner rod end of the dosing tube driving rod 323 is fixedly connected to the drug dosing tube 321 .

[0102] like Fig.11 As shown, the sedimentation interception mechanism 33 includes a plurality of sedimentation separation interception ring plates 331 fixed on the inner side wall of the sedimentation separation flow pipe 31, and the plane of the sedimentation separation interception ring plates 331 is arranged perpendicular to the axis of the sedimentation separation flow pipe 31;

[0103] There are multiple sedimentation separation interception ring plates 331 arranged along the axial direction of the sedimentation separation flow pipe 31;

[0104] On the side wall of the sedimentation separation flow pipe 31, there is an outer discharge tube fixing hole 3320 communicating with the inside and outside at the sedimentation separation interception ring plate 331. A sedimentation outer discharge tube 332 with an opening facing inward is fixed in the outer discharge tube fixing hole 3320. An outer discharge drive shaft 333 is rotatably connected in the sedimentation outer discharge tube 332. The outer discharge drive shaft 333 has a sedimentation outer discharge spiral blade 3330.

[0105] An outer end of the sedimentation outer discharge cylinder 332 is fixed with an outer discharge drive housing 334, an outer discharge drive shaft 333 extends into the inner portion of the outer discharge drive housing 334, and an outer discharge drive motor 335 for driving the outer discharge drive shaft 333 to rotate is fixed in the outer discharge drive housing 334;

[0106] A sedimentation slag discharge pipe 336 connected to the interior of the sedimentation outer discharge cylinder 332 is fixed to the outside thereof;

[0107] A scraper support ring rail 337 extending circumferentially around the inner wall of the sedimentation separation circulation tube 31 is fixed, a scraper support slider 338 is slidably connected to the scraper support ring rail 337, and a sedimentation cleaning scraper 339 is fixed to the scraper support slider 338.

[0108] like Fig.14 As shown, an aeration conveying ring shell 45 is fixed at the bottom of the biological aerobic treatment ring shell 41, and the top of the aeration conveying ring shell 45 is connected to the inside of the biological aerobic treatment ring shell 41 through multiple 450, and multiple aeration conveying spherical shells 451 are fixed in the aeration conveying ring shell 45, and multiple aeration nozzles 452 connected to the inside of the aeration conveying spherical shell 451 are fixed on the outer side of the aeration conveying spherical shell 451. The outer side of the aeration conveying spherical shell 451 is provided with an aeration conveying pipe 453 connected to the inside, and the aeration conveying pipe 453 is provided with an aeration conveying check valve 4530;

[0109] The aeration delivery pipe 453 is connected to the air delivery pump of the prior art, and the air delivery pump of the prior art is used to deliver air to the inside of the aeration delivery ball shell 451 through the aeration delivery pipe 453;

[0110] The biological aerobic treatment ring shell 41 is filled with biological aerobic filler 401, and the biological anaerobic treatment containing shell 42 is filled with biological anaerobic filler 402;

[0111] The outer side of the biological aerobic treatment ring shell 41 is provided with a plurality of aerobic treatment input pipes 403 connected to the interior thereof, and the bottom of the biological anaerobic treatment containing shell 42 is fixed with an anaerobic treatment output pipe 404 connected to the interior thereof;

[0112] The sedimentation separation output pipe 312 is connected to the aerobic treatment input pipe 403 .

[0113] like Fig.15 As shown, the membrane separation mechanism 50 includes a membrane separation starting housing 51, an ultrafiltration housing ring housing 52 is fixed to the outside of the membrane separation starting housing 51, a nanofiltration housing ring housing 53 is fixed to the outside of the ultrafiltration housing ring housing 52, and a reverse osmosis housing ring housing 54 is fixed to the outside of the nanofiltration housing ring housing 53;

[0114] A plurality of ultrafiltration filters 55 connected to the interior of the ultrafiltration housing ring 52 are fixed on the outer wall of the membrane separation starting housing 51, a plurality of nanofiltration filters 56 connected to the interior of the nanofiltration housing ring 53 are fixed on the outer wall of the ultrafiltration housing ring 52, and a plurality of reverse osmosis filters 57 connected to the interior of the reverse osmosis housing ring 54 are fixed on the outer wall of the nanofiltration housing ring 53;

[0115] The ultrafiltration filter 55 is an external pressure hollow fiber membrane ultrafiltration filter of the prior art. The input end of the ultrafiltration filter 55 is connected to the inside of the membrane separation starting housing 51, and the output end of the ultrafiltration filter 55 is connected to the inside of the ultrafiltration housing ring housing 52.

[0116] The nanofiltration filter 56 is an external pressure hollow fiber membrane nanofiltration filter of the prior art, the input end of the nanofiltration filter 56 is connected to the inside of the ultrafiltration containing ring shell 52, and the output end of the nanofiltration filter 56 is connected to the inside of the nanofiltration containing ring shell 53;

[0117] The reverse osmosis filter 57 is a polyamide composite membrane reverse osmosis filter of the prior art. The input end of the reverse osmosis filter 57 is connected to the inside of the nanofiltration containing ring shell 53 , and the output end of the reverse osmosis filter 57 is connected to the inside of the reverse osmosis containing ring shell 54 .

[0118] A membrane separation starting conveying pipe 510 connected to the inside is fixed to the top of the membrane separation starting housing 51, an ultrafiltration interception output pipe 520 connected to the inside is fixed to the bottom of the ultrafiltration housing ring housing 52, a nanofiltration interception output pipe 530 connected to the inside is fixed to the bottom of the nanofiltration housing ring housing 53, and a plurality of membrane separation total output pipes 540 connected to the inside are fixed to the outside of the reverse osmosis housing ring housing 54;

[0119] The anaerobic treatment output pipe 404 is connected to the membrane separation starting delivery pipe 510 .

[0120] Embodiment 2:

[0121] On the basis of Example 1, Figure 5 As shown, the regulating pool 14 is connected to a first reserved storage pool 16 through a first reserved delivery pipe 160, and the regulating pool 14 is connected to a second reserved storage pool 17 through a second reserved delivery pipe 170;

[0122] A first reflux delivery pump 161 is provided in the first reserved storage tank 16, and the output end of the first reflux delivery pump 161 is connected to the inside of the regulating tank 14 through a pipeline. A second reflux delivery pump 171 is provided in the second reserved storage tank 17, and the output end of the second reflux delivery pump 171 is connected to the inside of the regulating tank 14 through a pipeline.

[0123] Embodiment 3:

[0124] On the basis of Example 2, Figure 2 As shown, a grid slag discharge mechanism 12 is provided in the grid filter housing 111, and the grid slag discharge mechanism 12 comprises a slag discharge mechanism support ring shell 121 provided inside the grid support ring shell 112, and a plurality of grid slag discharge scrapers 120 are fixed to the outer side of the slag discharge mechanism support ring shell 121;

[0125] A slag discharge lifting fixed cylinder 122 with an opening facing downward is fixed on the top of the grid filter housing 111, a slag discharge lifting fixed cylinder 122 with an opening facing upward is slidably connected to a slag discharge lifting sliding cylinder 123, and the slag discharge mechanism supporting ring shell 121 is fixedly connected to the lower end of the slag discharge lifting sliding cylinder 123;

[0126] A slag discharge lifting fixed cylinder 122 is provided with a slag discharge lifting driving rod 124 for driving the slag discharge lifting sliding cylinder 123 to move. The slag discharge lifting driving rod 124 is an electrically controlled telescopic rod of the prior art. The outer rod end of the slag discharge lifting driving rod 124 is fixedly connected to the top of the slag discharge lifting sliding cylinder 123, and the inner rod end of the slag discharge lifting driving rod 124 is fixedly connected to the bottom of the slag discharge lifting sliding cylinder 123.

[0127] A slag collecting shell 125 connected to the interior of the grid supporting ring shell 112 is fixed at the bottom of the grid filtering and containing shell 111, and a slag external discharge pipe 126 connected to the interior of the slag collecting shell 125 is fixed at the lower end of the slag collecting shell 125.

[0128] Embodiment 4:

[0129] On the basis of Example 3, Fig.12 As shown, an aeration overflow pipe 454 extending vertically and communicating with the interior of the biological aerobic treatment ring shell 41 is fixed to the top thereof, and an aeration overflow check valve 4540 is provided on the aeration overflow pipe 454 .

[0130] In the actual application process of the present invention, the hazardous waste chemical sewage to be treated is first filtered to intercept and remove larger solid impurities in the sewage, and the hazardous waste chemical sewage to be treated is input into the grid support ring shell 112 through the grid filter input pipe 1110 by using the existing technology delivery pump, and the slag discharge external discharge pipe 126 is provided with a valve, and the valve on the slag discharge external discharge pipe 126 is in a closed state at this time;

[0131] After entering the grid support ring shell 112, hazardous waste chemical sewage flows from the inside to the outside through each filter grid 110, and multiple filter grids 110 are used to intercept impurities on the inside of the grid support ring shell 112;

[0132] The filter output hole 1140 is located between the outer wall of the grille support ring shell 112 and the inner wall of the grille filter housing 111. The hazardous waste chemical sewage after filtration enters the grille filter output ring shell 114 through the filter output hole 1140 and is finally discharged from the grille filter external discharge pipe 1141.

[0133] The impurities intercepted on the inner side of the grid support ring shell 112 are cleaned by using the grid slag discharge mechanism 12. The inner rod of the slag discharge lifting driving rod 124 is extended to drive the slag discharge lifting sliding cylinder 123 to move from top to bottom together with the slag discharge mechanism support ring shell 121. The impurities attached to the filter grid 110 are scraped and cleaned by using multiple grid slag discharge scrapers 120. The cleaned impurities will fall into the slag discharge collection shell 125. The valve on the slag discharge external discharge pipe 126 is opened. Driven by the impact of the water flow, the cleaned impurities are discharged through the slag discharge external discharge pipe 126, and then the valve on the slag discharge external discharge pipe 126 is closed.

[0134] The hazardous waste chemical wastewater discharged from the screen filter external discharge pipe 1141 then enters the regulating tank 14, where the pH value of the hazardous waste chemical wastewater is adjusted to 7.5, and then the hazardous waste chemical wastewater in the regulating tank 14 is discharged through the regulating tank external discharge pipe 140 and enters the sedimentation tank 15 for static sedimentation for 18 hours;

[0135] The hazardous waste chemical wastewater after static sedimentation is transported to the catalytic treatment circulation pipe 21 through the catalytic treatment input pipe 22 by using the existing technology delivery pump. During the hazardous waste chemical wastewater circulating in the catalytic treatment circulation pipe 21, the ultraviolet lamp 214 is turned on to irradiate the catalytic grid plate 212 and the catalytic grid plate support shaft 211. Under the oxidation catalytic action of titanium dioxide, organic pollutants can be decomposed into carbon dioxide, water and other harmless inorganic substances, and chlorinated aliphatic hydrocarbons and chlorinated aromatic hydrocarbons, pesticides, dyes and other difficult-to-degrade substances contained in the hazardous waste chemical wastewater can be decomposed and destroyed;

[0136] During the catalytic process, the rotary drive motor 219 is used to drive the rotary drive shaft 218 to rotate together with the catalyst grid support shaft 211 and the catalyst grid 212, so that the outer surfaces of the catalyst grid 212 and the catalyst grid support shaft 211 can be evenly irradiated by the ultraviolet lamp 214;

[0137] The hazardous waste chemical wastewater after catalytic treatment is discharged from the catalytic treatment output pipe 23 and then enters the sedimentation separation circulation pipe 31 through the sedimentation separation input pipe 311. During the circulation of the hazardous waste chemical wastewater in the sedimentation separation circulation pipe 31, the inner rod of the dosing pipe driving rod 323 extends to drive the reagent dosing pipe 321 to move along the axis of the dosing pipe matching hole 320, so that the reagent dosing pipe 321 extends into the sedimentation separation circulation pipe 31, and the polyacrylamide flocculant is transported to each reagent dosing pipe 321 by the delivery pump of the prior art. The flocculant is finally sprayed out from the reagent dosing nozzle 3210 to mix with the hazardous waste chemical wastewater, and chemically reacts with the suspended particles and colloidal substances in the hazardous waste chemical wastewater to form a larger floc precipitate;

[0138] The flocculent sediments are intercepted and separated by the sedimentation interception mechanism 33. The hazardous waste chemical sewage carries the flocculent sediments and continues to flow through the sedimentation separation flow pipe 31. When passing through the sedimentation separation interception ring plate 331, the sedimentation separation interception ring plate 331 is a hollow mesh filter structure. The flocculent sediments in the hazardous waste chemical sewage will be intercepted on the water-facing side of the sedimentation separation interception ring plate 331.

[0139] The scraper support slider 338 is driven by a motor of the prior art through gear transmission to move along the scraper support ring rail 337, and the scraper support slider 338 drives the sediment cleaning scraper 339 to move together. The sediment cleaning scraper 339 is used to scrape and push the floc sediment attached to the side of the sediment separation interception ring plate 331 to the sediment outer discharge tube 332, and the outer discharge drive motor 335 drives the outer discharge drive shaft 333 to rotate and drives the sediment outer discharge spiral blade 3330 to rotate together. The conveying effect of the sediment outer discharge spiral blade 3330 is used to convey the floc sediment to the sediment outer discharge tube 332, and the floc sediment is finally discharged through the sediment discharge pipe 336 under the conveying effect of the sediment outer discharge spiral blade 3330;

[0140] The hazardous waste chemical wastewater after the sedimentation separation treatment is discharged from the sedimentation separation output pipe 312 and input into the biological aerobic treatment ring shell 41 through the aerobic treatment input pipe 403. The hazardous waste chemical wastewater is subjected to aerobic biological treatment in the biological aerobic treatment ring shell 41. After the aerobic biological treatment, the hazardous waste chemical wastewater enters the biological anaerobic treatment containment shell 42 through the biological treatment delivery pipe 43. The hazardous waste chemical wastewater is subjected to anaerobic biological treatment in the biological anaerobic treatment containment shell 42. The organic pollutants in the hazardous waste chemical wastewater can be effectively removed through the aerobic biological treatment and the anaerobic biological treatment, and the chemical oxygen demand COD and the biochemical oxygen demand BOD can be reduced.

[0141] The air delivery pump of the prior art is used to deliver air to the inside of the aeration delivery spherical shell 451 through the aeration delivery pipe 453. The air is discharged through the aeration nozzle 452 to form tiny air bubbles. The air bubbles flow from bottom to top through each aeration delivery through hole 450 into the biological aerobic treatment ring shell 41, providing dissolved oxygen for the hazardous waste chemical sewage in the biological aerobic treatment ring shell 41.

[0142] Finally, the membrane separation mechanism 50 is used to purify the hazardous waste chemical wastewater. The hazardous waste chemical wastewater after anaerobic biological treatment is discharged from the anaerobic treatment output pipe 404 and enters the membrane separation starting containment shell 51 through the membrane separation starting delivery pipe 510. The hazardous waste chemical wastewater in the membrane separation starting containment shell 51 passes through each ultrafiltration filter 55 and enters the ultrafiltration containment ring shell 52. The hazardous waste chemical wastewater in the ultrafiltration containment ring shell 52 passes through each nanofiltration filter 56 and enters the nanofiltration containment ring shell 53. The hazardous waste chemical wastewater in the nanofiltration containment ring shell 53 passes through each reverse osmosis filter 57 and enters the reverse osmosis containment ring shell 54. The ultrafiltration filter 55, the nanofiltration filter 56 and the reverse osmosis filter 57 are used in turn to purify the hazardous waste chemical wastewater, effectively removing large molecular organic matter, colloids and bacteria, divalent and higher ions, and small molecular organic matter in the hazardous waste chemical wastewater, ensuring that the effluent water quality meets the zero emission requirements. The hazardous waste chemical wastewater after membrane separation treatment can finally be discharged from the membrane separation total output pipe 540.

Claims

1. A zero-discharge graded purification treatment equipment for hazardous chemical wastewater, characterized in that: It comprises a pretreatment mechanism (10), a catalytic treatment mechanism (20), a graded precipitation separation mechanism (30), a biological treatment mechanism (40) and a membrane separation mechanism (50) which are connected in sequence; The pretreatment mechanism (10) comprises a grille filtering mechanism (11), the grille filtering mechanism (11) comprises a grille filtering housing (111), a grille supporting ring housing (112) extending vertically is fixed in the grille filtering housing (111), a plurality of grille mounting grooves (113) extending vertically and communicating with each other inside and outside and being provided on the side wall of the grille supporting ring housing (112), and a filtering grille (110) is mounted in the grille mounting groove (113); A grille filter output annular shell (114) is fixed at the bottom of the grille filter accommodation shell (111); the inner bottom of the grille filter accommodation shell (111) has a plurality of filter output holes (1140) connected to the interior of the grille filter output annular shell (114); and a grille filter external discharge pipe (1141) connected to the interior of the grille filter output annular shell (114) is fixed at the bottom of the grille filter output annular shell (114); A vertically extending grid filter input pipe (1110) is fixed on the top of the grid filter containing shell (111), and the lower end of the grid filter input pipe (1110) extends to the inside of the grid support ring shell (112); The grille filter external discharge pipe (1141) is connected to a regulating tank (14), the regulating tank (14) is connected to a sedimentation tank (15) via the regulating tank external discharge pipe (140), and a sedimentation tank external discharge pipe (150) connected to the inside of the sedimentation tank (15) is fixed to the outside of the sedimentation tank (15); The catalytic treatment mechanism (20) comprises a horizontally arranged catalytic treatment flow pipe (21), wherein a catalytic grid support shaft (211) coaxially arranged therewith is rotatably connected therein, and a plurality of catalytic grids (212) extending parallel to the axis of the catalytic grid support shaft (211) are fixed to the outer side wall of the catalytic grid support shaft (211); The catalytic grid plate (212) and the catalytic grid plate support shaft (211) are both provided with a photocatalytic coating, and the photocatalytic coating is a titanium dioxide coating; A plurality of ultraviolet lamp tubes (214) are provided on the side wall of the catalytic treatment circulation pipe (21); The graded sedimentation separation mechanism (30) comprises a horizontally arranged sedimentation separation circulation pipe (31), a reagent dosing mechanism (32) is arranged on the side wall of the sedimentation separation circulation pipe (31), and a sedimentation interception mechanism (33) is arranged inside the sedimentation separation circulation pipe (31); The biological treatment mechanism (40) comprises an annular and hollow biological aerobic treatment ring shell (41), a biological anaerobic treatment containing shell (42) is arranged inside the biological aerobic treatment ring shell (41), and the biological aerobic treatment ring shell (41) and the biological anaerobic treatment containing shell (42) are connected to each other through a plurality of biological treatment conveying pipes (43); A plurality of aerobic treatment partitions (411) are fixed in the biological aerobic treatment ring shell (41), and two adjacent aerobic treatment partitions (411) divide the interior of the biological aerobic treatment ring shell (41) into an aerobic treatment chamber (410). A reinforced positive electrode plate (441) and a reinforced negative electrode plate (442) are fixed in the aerobic treatment chamber (410).

2. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: The regulating tank (14) is connected to a first reserved storage tank (16) via a first reserved delivery pipe (160), and the regulating tank (14) is connected to a second reserved storage tank (17) via a second reserved delivery pipe (170); A first reflux delivery pump (161) is provided in the first reserved storage tank (16), and an output end of the first reflux delivery pump (161) is connected to the interior of the regulating tank (14) through a pipeline. A second reflux delivery pump (171) is provided in the second reserved storage tank (17), and an output end of the second reflux delivery pump (171) is connected to the interior of the regulating tank (14) through a pipeline.

3. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: A grid slag discharge mechanism (12) is provided in the grid filter housing (111), the grid slag discharge mechanism (12) comprising a slag discharge mechanism support ring shell (121) arranged inside the grid support ring shell (112), and a plurality of grid slag discharge scrapers (120) are fixed to the outer side of the slag discharge mechanism support ring shell (121); A slag discharge lifting fixed cylinder (122) with an opening facing downward is fixed on the top of the grid filter housing (111), a slag discharge lifting sliding cylinder (123) with an opening facing upward is slidably connected inside the slag discharge lifting fixed cylinder (122), and the slag discharge mechanism supporting ring shell (121) is fixedly connected to the lower end of the slag discharge lifting sliding cylinder (123); A slag discharge lifting and lowering driving rod (124) for driving the slag discharge lifting and lowering sliding cylinder (123) to move is arranged in the slag discharge lifting and lowering fixed cylinder (122); A slag collecting shell (125) connected to the interior of the grating support ring shell (112) is fixed at the bottom of the grating filter housing shell (111), and a slag discharge external discharge pipe (126) connected to the interior of the slag collecting shell (125) is fixed at the lower end of the slag collecting shell (125).

4. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: The two ends of the catalytic treatment circulation pipe (21) are respectively fixed with a catalytic treatment input pipe (22) and a catalytic treatment output pipe (23) arranged coaxially therewith, and the catalytic treatment input pipe (22) is connected to the external discharge pipe (150) of the sedimentation tank; A plurality of light accommodating shells (213) are fixed to the outer side wall of the catalytic treatment circulation tube (21), and the ultraviolet lamp tube (214) is fixed in the light accommodating shell (213); The catalytic treatment flow pipe (21) has a light penetration slot (2150) on the side wall thereof, which is connected to the light containing shell (213), and a light sealing plate (215) made of a transparent material is fixed in the light penetration slot (2150); An axial end support shell (216) is provided at both ends of the catalytic grid support shaft (211) in the catalytic treatment circulation tube (21), and the axial end support shell (216) is fixedly connected to the inner side wall of the catalytic treatment circulation tube (21) through a plurality of radial guide plates (217); A coaxial rotating drive shaft (218) is fixed to the end of the catalytic grid support shaft (211), and the rotating drive shaft (218) extends into the interior of the shaft end support shell (216). A rotating drive motor (219) for driving the rotating drive shaft (218) to rotate is fixed inside the shaft end support shell (216).

5. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: The two ends of the sedimentation separation circulation pipe (31) are respectively fixed with a sedimentation separation input pipe (311) and a sedimentation separation output pipe (312) arranged coaxially therewith, and the sedimentation separation input pipe (311) is connected to the catalytic treatment output pipe (23); The reagent dosing mechanism (32) comprises a dosing pipe matching hole (320) which is arranged on the side wall of the sedimentation separation circulation pipe (31) and penetrates the pipe in a radial direction thereof, and a reagent dosing pipe (321) is slidably connected in the dosing pipe matching hole (320); A reagent dosing nozzle (3210) is fixed to one end of the reagent dosing pipe (321) located inside the sedimentation separation circulation pipe (31); A plurality of dosing tube drive accommodating cylinders (322) extending radially thereof are fixed to the outer wall of the sedimentation separation circulation tube (31), and the reagent dosing tubes (321) extend one by one into each of the dosing tube drive accommodating cylinders (322). A dosing tube drive accommodating cylinder (322) is provided inside the dosing tube drive accommodating cylinder (322) for driving the reagent dosing tubes (321) to move.

6. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: The sedimentation interception mechanism (33) comprises a plurality of sedimentation separation interception ring plates (331) fixed on the inner side wall of the sedimentation separation circulation pipe (31), and the sedimentation separation interception ring plates (331) are arranged with their planes perpendicular to the axis of the sedimentation separation circulation pipe (31); The side wall of the sedimentation separation circulation pipe (31) is provided with an outer row tube fixing hole (3320) communicating with the inside and outside at the sedimentation separation interception ring plate (331), a sedimentation outer row tube (332) with an opening facing inward is fixed in the outer row tube fixing hole (3320), an outer row drive shaft (333) is rotatably connected in the sedimentation outer row tube (332), and the outer row drive shaft (333) is provided with a sedimentation outer row spiral blade (3330); An outer end of the sedimentation outer discharge cylinder (332) is fixed with an outer discharge drive housing (334), the outer discharge drive shaft (333) extends into the inner part of the outer discharge drive housing (334), and an outer discharge drive motor (335) for driving the outer discharge drive shaft (333) to rotate is fixed in the outer discharge drive housing (334); A sedimentation slag discharge pipe (336) connected to the interior of the sedimentation outer discharge cylinder (332) is fixed on the outside of the sedimentation outer discharge cylinder (332); A scraper support ring rail (337) extending circumferentially around the inner wall of the sedimentation separation circulation pipe (31) is fixed thereto, a scraper support slider (338) is slidably connected to the scraper support ring rail (337), and a sedimentation cleaning scraper (339) is fixed to the scraper support slider (338).

7. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: An aeration conveying ring shell (45) is fixed at the bottom of the biological aerobic treatment ring shell (41); the top of the aeration conveying ring shell (45) is connected to the inside of the biological aerobic treatment ring shell (41) through a plurality of aeration conveying through holes (450); a plurality of aeration conveying spherical shells (451) are fixed in the aeration conveying ring shell (45); a plurality of aeration nozzles (452) connected to the inside of the aeration conveying spherical shell (451) are fixed on the outer side surface; an aeration conveying pipe (453) connected to the inside of the aeration conveying spherical shell (451) is provided on the outer side of the aeration conveying spherical shell (451); and an aeration conveying check valve (4530) is provided on the aeration conveying check valve (453); The biological aerobic treatment ring shell (41) is filled with biological aerobic filler (401), and the biological anaerobic treatment containing shell (42) is filled with biological anaerobic filler (402); The outer side of the biological aerobic treatment ring shell (41) is provided with a plurality of aerobic treatment input pipes (403) connected to the interior thereof, and the bottom of the biological anaerobic treatment containing shell (42) is fixed with an anaerobic treatment output pipe (404) connected to the interior thereof; The sedimentation separation output pipe (312) is connected to the aerobic treatment input pipe (403).

8. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: An aeration overflow pipe (454) extending vertically and communicating with the interior of the biological aerobic treatment ring shell (41) is fixed to the top of the ring shell (41), and an aeration overflow check valve (4540) is provided on the aeration overflow pipe (454).

9. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 1 is characterized in that: The membrane separation mechanism (50) comprises a membrane separation starting containment shell (51), an ultrafiltration containment ring shell (52) is fixed on the outer side of the membrane separation starting containment shell (51), a nanofiltration containment ring shell (53) is fixed on the outer side of the ultrafiltration containment ring shell (52), and a reverse osmosis containment ring shell (54) is fixed on the outer side of the nanofiltration containment ring shell (53); A plurality of ultrafiltration filters (55) connected to the interior of the ultrafiltration containing ring shell (52) are fixed on the outer wall of the membrane separation starting containing shell (51); a plurality of nanofiltration filters (56) connected to the interior of the nanofiltration containing ring shell (53) are fixed on the outer wall of the ultrafiltration containing ring shell (52); and a plurality of reverse osmosis filters (57) connected to the interior of the reverse osmosis containing ring shell (54) are fixed on the outer wall of the nanofiltration containing ring shell (53).

10. The zero-discharge graded purification treatment equipment for hazardous chemical wastewater according to claim 9 is characterized in that: A membrane separation starting conveying pipe (510) connected to the interior is fixed to the top of the membrane separation starting housing (51), an ultrafiltration interception output pipe (520) connected to the interior is fixed to the bottom of the ultrafiltration housing ring housing (52), a nanofiltration interception output pipe (530) connected to the interior is fixed to the bottom of the nanofiltration housing ring housing (53), and a plurality of membrane separation total output pipes (540) connected to the interior are fixed to the outside of the reverse osmosis housing ring housing (54); The anaerobic treatment output pipe (404) is connected to the membrane separation starting transport pipe (510).

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