Wastewater treatment system

Abstract

The present application discloses a wastewater treatment system, which relates to the technical field of lithium battery production wastewater treatment, wherein the wastewater treatment system includes an oxidation device, a coagulation sedimentation tank, an upflow anaerobic sludge bed and an anaerobic-aerobic treatment device connected in sequence; a partition is provided in the coagulation sedimentation tank, and the partition separates the coagulation sedimentation tank into a coagulation sedimentation area and a packing area connected at the bottom, the water inlet of the coagulation sedimentation tank is connected to the coagulation sedimentation area, and the water outlet of the coagulation sedimentation tank is connected to the packing area. The technical solution provided by the present application can more efficiently remove pollutants in the cathode wastewater of lithium batteries and achieve good wastewater treatment effects.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery production wastewater treatment, and in particular to a wastewater treatment system. Background Art

[0002] As a new type of secondary battery, lithium batteries have been widely used in new energy vehicles and industrial energy storage. A large amount of high-concentration cathode wastewater is generated during the production of lithium batteries. This wastewater has the characteristics of high chemical oxygen demand (COD), high suspended solids (SS) and extremely poor biodegradability (low BOD / COD), posing a potential threat to the ecological environment. However, due to the high concentration of refractory organic matter in lithium battery cathode wastewater, the existing wastewater treatment process is used to treat lithium battery cathode wastewater to meet emission requirements, which has the problem of long treatment process and high difficulty. Summary of the invention

[0003] The main purpose of the present invention is to propose a wastewater treatment system, which aims to more efficiently remove pollutants in lithium battery cathode wastewater and achieve good wastewater treatment effects.

[0004] To achieve the above-mentioned purpose, the wastewater treatment system proposed in the present invention comprises an oxidation device, a coagulation sedimentation tank, an upflow anaerobic sludge bed and an anaerobic-aerobic treatment device which are connected in sequence; a partition is provided in the coagulation sedimentation tank, and the partition separates the coagulation sedimentation tank into a coagulation sedimentation area and a filler area which are connected at the bottom, the water inlet of the coagulation sedimentation tank is connected to the coagulation sedimentation area, and the water outlet of the coagulation sedimentation tank is connected to the filler area.

[0005] In this arrangement, when treating wastewater, the wastewater first flows into the oxidation device, so that the wastewater undergoes an oxidation reaction, opens the ring and breaks the chain of organic macromolecules, and turns them into small molecular weight substances, thereby improving the biodegradability of the wastewater. Then, the wastewater after oxidation treatment enters the coagulation sedimentation tank for coagulation and sedimentation, and the tiny particles suspended in the water are aggregated into large particles by adding coagulants, thereby achieving solid-liquid separation; the supernatant after separation enters the upflow anaerobic sludge bed. The upflow anaerobic sludge bed is provided with a sludge layer. After the wastewater enters the upflow anaerobic sludge bed, at least part of the organic matter in the wastewater can be decomposed by microorganisms in the sludge, so that the organic matter is further broken and degraded. The wastewater treated by the upflow anaerobic sludge bed enters the anoxic tank of the anaerobic-aerobic treatment device, where the organic matter can be further broken and degraded, and then the wastewater enters the aerobic tank of the anaerobic-aerobic treatment device to further remove reducing substances such as organic matter and ammonia nitrogen pollutants, thereby improving the effluent water quality. That is, in the technical solution of the present application, the biodegradability of the wastewater is first improved by an oxidation device to facilitate subsequent biochemical treatment, and then the suspended particles are precipitated and separated in a coagulation sedimentation tank; and then the organic pollutants in the wastewater are further degraded and removed by biochemical treatment devices such as an upflow anaerobic sludge bed and an anaerobic-aerobic treatment device, thereby having a better wastewater treatment effect. Moreover, the treatment process is relatively short, and the pollutants in the lithium battery cathode wastewater can be removed more efficiently.

[0006] In one embodiment, the oxidation device includes at least one of an electrolytic cell and a Fenton reaction cell. This arrangement is to use at least one of an electrochemical oxidation process and a chemical oxidation process to treat the wastewater, and one or a combination of the two processes can be selected according to different needs.

[0007] In one embodiment, the oxidation device comprises the electrolytic cell and the Fenton reaction cell connected in sequence, the electrolytic cell is provided with a water inlet, and the water outlet of the Fenton reaction cell is connected to the coagulation sedimentation tank. This arrangement allows for more usage modes when the oxidation device is enabled, and is suitable for different wastewater treatment needs. Among them, only the electrolytic cell or the Fenton reaction cell can be used to oxidize the wastewater, at which time no Fenton reagent is added to the Fenton reaction cell or the electrolytic cell is not powered; electrolysis combined with Fenton technology can also be used to improve the treatment effect of wastewater.

[0008] In one embodiment, the oxidation device is provided with at least a Fenton reaction tank, and a stirrer is provided in the Fenton reaction tank. This arrangement can improve the uniform mixing of wastewater and substances such as Fenton reagent in the Fenton reaction tank, thereby improving the wastewater treatment effect.

[0009] In one embodiment, the oxidation device is provided with at least an electrolytic cell, in which an electrolytic filler is provided; this arrangement can break the macromolecular chains through the oxidation action of iron-carbon micro-electrolysis, can effectively reduce the COD value, and the generated reaction substances are beneficial to subsequent wastewater treatment.

[0010] And / or, the oxidation device further comprises a drug feeding device, which is connected to the electrolytic cell and is used to adjust the pH value of the wastewater in the electrolytic cell. This arrangement can adjust the pH value in the electrolytic cell to a suitable range, which is conducive to improving the reaction rate and reaction effect.

[0011] In one embodiment, the oxidation device further comprises a first aeration pipe, which is inserted into the cavity of the oxidation device. This arrangement can provide sufficient oxygen to the oxidation device to avoid insufficient oxygen affecting the oxidation treatment effect of the wastewater.

[0012] In one embodiment, at least one of an inclined plate filler and an inclined tube filler is arranged in the packing area. This arrangement can extend the flow path of the wastewater and improve the sedimentation effect. The arrangement of the inclined plate and / or the inclined tube can extend the flow path of the wastewater while increasing the volume of the device.

[0013] In one embodiment, a first mud discharge port is opened at the bottom of the coagulation sedimentation tank; this arrangement facilitates the cleaning of sludge in the coagulation sedimentation tank, and the sludge can be cleaned during the wastewater treatment process, thereby avoiding the continuous increase of sludge amount in the coagulation sedimentation tank as the wastewater treatment process continues.

[0014] And / or, the cross section of at least a part of the bottom of the coagulation sedimentation tank gradually decreases from top to bottom. This arrangement is conducive to guiding the flocculation particles to settle downward.

[0015] In one embodiment, the upflow anaerobic sludge blanket comprises:

[0016] A reaction container, wherein a reaction zone, a sedimentation zone and a gas-liquid separation zone are sequentially arranged in the reaction container from bottom to top along the height direction, the bottom of the reaction container is connected to the water outlet of the coagulation sedimentation tank, and the top of the reaction container is provided with an air outlet and a water outlet connected to the gas-liquid separation zone, and the air outlet is higher than the water outlet of the reaction container; and

[0017] A three-phase separator is arranged in the precipitation zone.

[0018] In this arrangement, when wastewater enters the reaction vessel from the water inlet at the bottom of the reaction vessel, it first passes through the reaction zone, where organic matter is degraded in the sludge layer, and then the generated bubbles flow upward with the water flow; the three-phase separator can separate the methane and other gases generated in the reaction process, the sludge rising with the water flow, and the treated wastewater, so that the sludge is re-precipitated and descends to the reaction zone to avoid a large amount of sludge flowing away with the water flow, resulting in a decrease in the sludge concentration in the reaction zone, which affects the treatment effect of the upflow anaerobic sludge bed on the sludge.

[0019] In one embodiment, the bottom of the reaction container is provided with an insertion port, and the upflow anaerobic sludge blanket further comprises a water distributor, which is inserted into the reaction container from the insertion port, and one end of the water distributor located outside the reaction container is connected to the water outlet of the coagulation sedimentation tank. This arrangement can prevent the water inlet from being blocked by sludge and affecting the wastewater from entering the upflow anaerobic sludge blanket.

[0020] In one embodiment, the water distributor comprises:

[0021] A connecting section, the connecting section being passed through the insertion port and being communicated with a water outlet of the coagulation sedimentation tank; and

[0022] At least one water outlet section, the water outlet section is located in the reaction container and connected to the connecting section, the water outlet section extends from the connecting section to the side of the connecting section, and the water outlet section is provided with a plurality of discharge ports.

[0023] This arrangement is conducive to evenly discharging wastewater into different locations of the reaction container.

[0024] In one embodiment, the discharge port is arranged toward the bottom wall of the reaction container; this arrangement is conducive to the wastewater entering the reaction container and the sludge at the bottom of the reaction zone to be fully mixed and contacted, and the water flow discharged from the water distributor is opposite to the direction of the rising water flow and air flow, which can flush the suspended sludge and other substances in the rising water flow and air flow downward to make the suspended sludge fall back into the sludge layer, thereby avoiding the reduction of sludge concentration in the reaction zone and affecting the treatment effect of the upflow anaerobic sludge bed on the sludge.

[0025] And / or, at least part of the connecting section located in the reaction container extends along the cross-sectional direction of the reaction container, and at least two water outlet sections are arranged side by side along the extension direction of the connecting section; this arrangement is conducive to uniform discharge of wastewater into the reaction container.

[0026] And / or, at least two of the water outlet sections are respectively arranged on both sides of the connecting section; this arrangement is conducive to evenly discharging wastewater into the reaction container.

[0027] In one embodiment, the coagulation sedimentation tank is connected to the reaction container via a first water inlet pipe, and the reaction container is provided with a first flow guide port connected to the gas-liquid separation zone;

[0028] The upflow anaerobic sludge bed is also provided with a first circulation pipeline and a first circulation water pump. The first circulation pipeline connects the first diversion port and the first water inlet pipeline. The first circulation water pump is arranged in the first circulation pipeline and is used to introduce part of the liquid in the gas-liquid separation zone into the first water inlet pipeline.

[0029] This arrangement can utilize the liquid that has been treated in the reaction zone and flows into the gas-liquid separation zone to dilute the wastewater flowing from the coagulation sedimentation tank to the upflow anaerobic sludge bed, thereby avoiding the high organic matter concentration in the wastewater flowing into the upflow anaerobic sludge bed, which leads to poor treatment effect of the wastewater in the reaction zone and reduces the load of the upflow anaerobic sludge bed.

[0030] In one embodiment, the reaction zone includes a sludge zone located at the bottom of the reaction container and a suspended filler zone located above the sludge zone; this arrangement can prevent the loss of sludge, and the filler can provide an area for microbial attachment and production, which is beneficial to improving the wastewater treatment effect.

[0031] And / or, the reaction container also includes a first overflow groove arranged on the outside of the gas-liquid separation zone, the side wall of the gas-liquid separation zone is provided with a first overflow port connected to the first overflow groove, the first overflow port is located below the gas outlet, and the groove wall of the first overflow groove is provided with a water outlet of the reaction container; this arrangement can control the water level in the gas-liquid separation zone and avoid the problem of wastewater leakage caused by water discharge from the gas outlet.

[0032] And / or, the cross-section of at least part of the bottom area of ​​the reaction container gradually decreases from top to bottom; this arrangement helps to further flocculate and precipitate the sludge flocs, causing the sludge particles to settle to the bottom of the reaction zone, so that the sludge at the bottom of the reaction zone has a higher concentration and achieves a better wastewater treatment effect.

[0033] And / or, a second mud discharge port is provided at the bottom of the reaction vessel. This arrangement makes it easy to clean the sludge in the reaction vessel and can remove part of the sludge during the wastewater treatment process, thereby preventing the wastewater from entering the reaction vessel and affecting the normal operation of the device as the sludge content in the reaction zone continues to increase during the reaction process.

[0034] In one embodiment, the anaerobic-aerobic treatment device comprises an anoxic tank and an aerobic tank connected in sequence;

[0035] Among them, the anaerobic-aerobic treatment device also includes a second aeration pipe, which is inserted into the aerobic tank and connected to the aerobic tank; this arrangement can provide sufficient oxygen to the aerobic tank, which is beneficial to improving the activity of aerobic organisms in the aerobic tank, thereby improving the water treatment effect in the aerobic tank.

[0036] And / or, the anaerobic-aerobic treatment device further includes a sludge return pipe, one end of which extends to the bottom of the aerobic tank, and the other end of which is inserted into the anoxic tank. In this way, part of the sludge in the aerobic tank can be returned to the anoxic tank through the sludge return pipe, so that the microorganisms required for denitrification can be provided to the anoxic tank; and the sludge in the aerobic tank can be reduced to avoid a large increase in the sludge in the aerobic tank.

[0037] In one embodiment, a filler is provided in the anoxic tank of the anaerobic-aerobic treatment device. This arrangement is conducive to increasing the attachment area of ​​microorganisms in the anoxic tank, thereby increasing the content of microorganisms in the anoxic tank, and increasing the growth rate and oxidation reaction rate of microorganisms, thereby effectively increasing the reaction rate and accelerating the wastewater treatment speed.

[0038] In one embodiment, the filler is an elastic filler; in this configuration, the elastic filler has a larger surface area and porosity, which can improve the pollutant treatment efficiency of the anoxic tank. The softness of the elastic filler can reduce the impact and wear of the suspended sludge and microorganisms on the filler, thereby extending the service life of the filler.

[0039] And / or, the anoxic tank is provided with at least two packing beds arranged in sequence along the cross-sectional direction of the anoxic tank, wherein at least one of the packing beds is provided with the packing. This arrangement can increase the concentration of microorganisms in the anoxic tank to a high degree and improve the wastewater treatment effect.

[0040] In one embodiment, the wastewater treatment system further includes an adsorption filtration device, which is connected to the water outlet of the anaerobic-aerobic treatment device. In this arrangement, the adsorption filtration device can be used to further remove at least part of the organic matter that has not been removed from the wastewater after the front-end treatment, especially reducing substances such as organic matter that is difficult to biodegrade, and if there are pollutants such as heavy metals in the wastewater, at least part of them can also be removed by adsorption filtration, thereby improving the treatment effect of the wastewater.

[0041] In one embodiment, the adsorption filtration device comprises:

[0042] A filter container, wherein a water inlet and a water outlet of the filter container are arranged at intervals from bottom to top; and

[0043] The adsorption bed is arranged between the water inlet and the water outlet of the filter container.

[0044] This arrangement allows the wastewater after front-end treatment to flow from bottom to top after entering the adsorption filtration device. The water flow rate is relatively slow, so that the impurities in the water are fully adsorbed by the adsorption bed, thereby improving the treatment effect. In addition, the way the water flows from bottom to top can allow some impurities with larger particles to settle first, thereby avoiding the problem of the upper surface of the adsorption bed being blocked by impurities when using the filtration method of water flowing downward.

[0045] In one embodiment, the anaerobic-aerobic treatment device is connected to the water inlet of the filter container through a second water inlet pipe, and the filter container is provided with a second guide port connected to the space above the adsorption bed;

[0046] The adsorption and filtration device is also provided with a second circulation pipeline and a second circulation water pump, the second circulation pipeline connects the second guide port and the second water inlet pipeline, and the second circulation water pump is arranged in the second circulation pipeline for introducing part of the liquid in the space above the adsorption bed into the second water inlet pipeline.

[0047] This arrangement can utilize the liquid that has been adsorbed and filtered to dilute the wastewater to be treated that flows from the anaerobic-aerobic treatment device to the adsorption filtration device, thereby avoiding the high concentration of pollutants in the wastewater flowing into the adsorption filtration device, which may cause the adsorption bed to be overloaded and affect the adsorption filtration effect.

[0048] In one embodiment, the adsorption bed is provided with activated carbon filler; in this arrangement, since the activated carbon filler has a large specific surface area, it can effectively adsorb organic substances in the wastewater, especially organic pollutants that are difficult to biodegrade. In addition, the activated carbon filler adsorption bed also has good decolorization and odor removal effects, which can further improve the water quality of the treated wastewater.

[0049] And / or, a third mud row port is provided at the bottom of the filter container; this arrangement facilitates the cleaning of the sludge in the filter container and can remove part of the sludge during the wastewater treatment process, thereby avoiding the continuous increase of the sludge content in the filter container as the wastewater treatment process continues, thereby affecting the normal operation of the device.

[0050] And / or, the cross section of at least part of the bottom of the filter container gradually decreases from top to bottom; this arrangement is conducive to allowing the sludge particles to settle to the bottom of the filter container.

[0051] And / or, the filter container further comprises a second overflow groove disposed outside the filter container, a second overflow port connecting the second overflow groove and the space above the adsorption bed is provided on the side wall of the filter container, and a water outlet of the filter container is provided on the groove wall of the second overflow groove. This arrangement is conducive to controlling the water level in the filter container and the flow rate of the filter device through the arrangement of the second overflow hole and the second overflow groove.

[0052] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0054] Figure 1 A schematic diagram of the structure of an embodiment of a wastewater treatment system provided by the present application;

[0055] Figure 2 for Figure 1 Schematic diagram of the structure of an upflow anaerobic sludge blanket in a wastewater treatment system;

[0056] Figure 3 for Figure 2 Bottom view of the reaction vessel in the upflow anaerobic sludge blanket;

[0057] Figure 4 for Figure 2 Bottom view of the water distributor in the upflow anaerobic sludge blanket.

[0058] Description of Figure Numbers:

[0059] 100. Wastewater treatment system; 1. Oxidation device; 11. Electrolytic cell; 111. Electrolytic filler; 12. Fenton reaction cell; 13. Agitator; 14. First aeration pipeline;

[0060] 2. Coagulation sedimentation tank; 21. Coagulation sedimentation area; 22. Filling area; 23. First mud discharge port; 24. Inclined plate filler;

[0061] 3. Upflow anaerobic sludge blanket; 31. Reaction vessel; 311. Reaction zone; 3111. Sludge zone; 3112. Suspended filler zone; 312. Sedimentation zone; 313. Gas-liquid separation zone; 314. Gas outlet; 315. First flow guide port; 316. First overflow port; 317. First overflow trough; 318. Second mud outlet; 319. Insertion port; 32. Three-phase separator; 33. Water distributor; 331. Connecting section; 332. Water outlet section; 333. Discharge port; 34. Suspended filler; 35. First water inlet pipe; 36. First circulation pipeline; 37. First circulation water pump;

[0062] 4. Anaerobic-aerobic treatment device; 41. Anoxic tank; 411. Elastic filler; 412. Filler bed; 42. Aerobic tank; 43. Second aeration pipeline; 44. Sludge return pipeline;

[0063] 5. Adsorption filtration device; 51. filtration container; 511. second guide port; 512. second overflow port; 513. second overflow trough; 514. third mud discharge port; 52. adsorption bed; 53. activated carbon filler; 54. second water inlet pipe; 55. second circulation pipeline; 56. second circulation water pump.

[0064] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0067] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0068] The production process of lithium batteries generates a large amount of high-concentration cathode wastewater, which has the characteristics of high chemical oxygen demand (COD), high suspended solids (SS) and extremely poor biodegradability (low BOD / COD). With the rapid development of the lithium battery industry, its production wastewater poses a potential threat to the ecological environment.

[0069] The present invention proposes a wastewater treatment system 100, which can relatively reliably treat cathode wastewater generated in the lithium battery production process, reduce pollutants in the wastewater, and improve the water quality of the effluent after the wastewater treatment.

[0070] See also Figure 1 In one embodiment of the present invention, the wastewater treatment system 100 includes an oxidation device 1, a coagulation sedimentation tank 2, an upflow anaerobic sludge blanket 3 and an anaerobic-aerobic treatment device 4 which are connected in sequence; a partition is provided in the coagulation sedimentation tank 2, and the partition separates the coagulation sedimentation tank 2 into a coagulation sedimentation area 21 and a filler area 22 which are connected at the bottom, the water inlet of the coagulation sedimentation tank 2 is connected to the coagulation sedimentation area 21, and the water outlet of the coagulation sedimentation tank 2 is connected to the filler area 22.

[0071] In the embodiment of the present application, the oxidation device 1 is used to pre-treat the wastewater. The wastewater can be oxidized when entering the oxidation device 1, so that the organic macromolecules in the wastewater are ring-opened and chain-broken, thereby converting the organic macromolecules into small molecular weight substances, thereby improving the biodegradability of the wastewater. Biodegradability can be reflected by BOD (biochemical oxygen demand) and COD (chemical oxygen demand). BOD (biochemical oxygen demand) refers to the amount of dissolved oxygen consumed in the biochemical reaction process of microorganisms decomposing biodegradable organic matter in water; COD (chemical oxygen demand) refers to the amount of reducing substances that need to be oxidized in the water sample. Reducing substances include various organic substances, nitrites, sulfides, ferrous salts, etc., mainly organic substances.

[0072] Among them, the oxidation device 1 can adopt at least one oxidation method such as electrochemical oxidation, chemical oxidation, photocatalytic oxidation and biological oxidation. For example, at least one of an electrolysis device, a Fenton reaction device, a light radiation device, etc. can be set to treat the wastewater.

[0073] After the wastewater is oxidized, it is discharged into the coagulation sedimentation tank 2 for flocculation and sedimentation. The coagulation sedimentation tank 2 is provided with a partition to separate the coagulation sedimentation tank 2 into a coagulation sedimentation area 21 and a filler area 22 connected at the bottom. The wastewater first enters the coagulation sedimentation area 21. By adding some reagents (usually called coagulants and coagulants) into the water, during this process, the particles in the water can aggregate with each other to form colloids through the action of the reagents, and then combine with impurities in the water body to form larger floccules and precipitate downward to form sludge, while the supernatant passes through the filler area 22 and is discharged outward through the outlet. The filler area 22 can intercept the floccules to prevent the floccules from being discharged into the subsequent treatment device. In this setting, the water inlet and outlet areas in the coagulation sedimentation tank 2 are separated by a partition, which can prevent the water inlet into the coagulation sedimentation tank 2 from driving the sediment upward, thereby avoiding the phenomenon of flocculation particles surging.

[0074] The upflow anaerobic sludge blanket 3 generally comprises a reaction vessel 31, in which a sludge layer is arranged, in which granular sludge of most highly active microorganisms is mainly concentrated. Wastewater enters the reaction vessel 31 from the bottom water inlet of the reaction vessel 31 and passes through the sludge layer, so that at least part of the organic matter in the wastewater is decomposed by the microorganisms in the sludge, so that the organic matter is further degraded by chain breaking. In this process, methane and other gases are generated, which can flow upward with the water flow and then be discharged from the gas outlet 314 at the top of the reaction vessel 31 and collected; and in the process of the water flow and gas flowing upward, part of the sludge will also be driven to flow upward, and a sludge suspension zone will be formed above the sludge layer at this time. The sludge suspension zone is an area where flocculent sludge is concentrated, and the sludge concentration therein is lower than that of the sludge layer, which is generally non-granular sludge, and its sedimentation rate is significantly lower than that of the granular sludge. The bubbles rising from the sludge layer make this layer of sludge well mixed, and part of the organic matter decomposition will also occur in the sludge suspension zone.

[0075] In some embodiments, in order to prevent the sludge from flowing with the water flow and gas to the top of the reaction space and being discharged from the water outlet, a three-phase separator 32 can be set above the reaction zone 311 to separate the gas, liquid and fixed (sludge particles), so that the sludge is re-precipitated and descends into the reaction zone 311 to avoid a large amount of sludge flowing away with the water flow.

[0076] After the wastewater is treated by the upflow anaerobic sludge bed 3, it enters the anaerobic-aerobic treatment device 4 for biochemical treatment. The anaerobic-aerobic treatment device 4 includes an anoxic tank 41 and an aerobic tank 42 connected in sequence. In the anoxic tank 41, the organic matter can be further degraded by chain breaking, and then the wastewater enters the aerobic tank 42 of the anaerobic-aerobic treatment device 4 to further remove reducing substances such as organic matter and nitrogen and phosphorus pollutants, thereby improving the effluent quality. That is, in the technical solution of the present application, the biodegradability of the wastewater is first improved by the oxidation device 1 to facilitate subsequent biochemical treatment, and then the suspended particles are precipitated and separated in the coagulation sedimentation tank 2; the organic pollutants in the wastewater are further degraded and removed by the biochemical treatment devices such as the upflow anaerobic sludge bed 3 and the anaerobic-aerobic treatment device 4, thereby having a better wastewater treatment effect and a relatively short treatment process, and the process of removing pollutants in the lithium battery cathode wastewater is efficient and convenient.

[0077] In some embodiments, after front-end treatment, there are still some organic substances in the wastewater that are difficult to remove through biochemical processes. An adsorption filtration device 5 can be set after the anaerobic-aerobic treatment device 4 to further remove at least some of the organic substances that have not been removed in the wastewater after the front-end treatment, especially reducing substances such as organic matter that is difficult to biodegrade. If the wastewater contains pollutants such as heavy metals, at least some of them can also be removed by adsorption filtration, thereby improving the treatment effect of the wastewater and further improving the water quality after treatment.

[0078] Therefore, it can be understood that in the technical solution of the present application, when treating wastewater, the wastewater first flows into the oxidation device 1, so that the wastewater undergoes an oxidation reaction, opens the ring and breaks the chain of organic macromolecules, and turns them into low molecular weight substances, thereby improving the biodegradability of the wastewater. Then, the wastewater after oxidation treatment enters the coagulation sedimentation tank 2 for coagulation and sedimentation, and the tiny particles suspended in the water are aggregated into large particles by adding coagulants, thereby achieving solid-liquid separation; the supernatant after separation enters the upflow anaerobic sludge bed 3. A sludge layer is provided in the upflow anaerobic sludge bed 3. After the wastewater enters the upflow anaerobic sludge bed 3, at least part of the organic matter in the wastewater can be decomposed by microorganisms in the sludge, so that the organic matter is further degraded by chain breaking. The wastewater treated by the upflow anaerobic sludge blanket 3 enters the anoxic tank 41 of the anaerobic-aerobic treatment device 4, where the organic matter can be further broken and degraded, and then the wastewater enters the aerobic tank 42 of the anaerobic-aerobic treatment device 4 to further remove reducing substances such as organic matter and ammonia nitrogen pollutants, thereby improving the effluent quality.

[0079] See also Figure 1 In one embodiment, the oxidation device 1 includes at least one of an electrolytic cell 11 and a Fenton reaction cell 12 .

[0080] In this embodiment, at least one of an electrochemical oxidation process and a chemical oxidation process may be used to treat the wastewater, and one or a combination of the two processes may be selected according to different requirements.

[0081] For example, the oxidation device 1 can be an electrolysis device, which is provided with an electrolysis cell 11. The wastewater serves as an electrolyte in the electrolysis cell 11, and oxidation and reduction reactions occur at the anode and cathode respectively, thereby achieving oxidation treatment of the wastewater, causing the organic macromolecules in the wastewater to open their rings and break their chains, thereby converting the organic macromolecules into small molecular weight substances, thereby improving the biodegradability of the wastewater.

[0082] In addition, the oxidation device 1 can also be a Fenton reaction device. The essence of the Fenton reaction is that the chain reaction between the divalent iron ion and the hydroperoxide catalyzes the generation of hydroxyl radicals, which is a free radical with strong oxidizing ability and can non-selectively oxidize most organic matter in the water. The Fenton reaction device is provided with a Fenton reaction tank 12, in which the hydroperoxide and the iron ion are mixed in a certain proportion and added to the wastewater, for example, the Fenton reagent of hydrogen peroxide and ferrous sulfate can be added. Wherein the hydroperoxide is an oxidant, which can produce hydroxyl radicals, and the iron ion is a catalyst, which can accelerate the generation and reaction speed of hydroxyl radicals. The wastewater is oxidized by the Fenton reaction in the Fenton reaction tank 12, and the organic macromolecular substances in the wastewater can also be opened and broken, so that the organic macromolecules can be turned into small molecular weight substances, thereby improving the biodegradability of the wastewater.

[0083] In some embodiments, when the Fenton reaction process is used for wastewater treatment, other methods may be combined to improve the treatment effect, such as the photo-Fenton process combined with light radiation, and the electro-Fenton process combined with the electrolysis process in the following embodiments.

[0084] See also Figure 1 In one embodiment, the oxidation device 1 includes an electrolytic cell 11 and a Fenton reaction cell 12 which are connected in sequence. The electrolytic cell 11 is provided with a water inlet, and the water outlet of the Fenton reaction cell 12 is connected to the coagulation sedimentation tank 2.

[0085] In this embodiment, the oxidation device 1 is provided with an electrolytic cell 11 and a Fenton reaction cell 12 at the same time; such a configuration enables the oxidation device 1 to perform both electrolytic oxidation treatment and Fenton reaction oxidation treatment, and also enables the electrolytic cell 11 and the Fenton reaction cell 12 to simultaneously use an electro-Fenton process to oxidize wastewater; thus, the oxidation device 1 has more usage modes and is suitable for different wastewater treatment needs. Among them, the method of using the electrolytic cell 11 alone and the Fenton reaction cell 12 alone to treat wastewater refers to the above-mentioned embodiment, and will not be repeated here.

[0086] When the electrolytic cell 11 and the Fenton reaction cell 12 are used simultaneously, the wastewater first enters the electrolytic cell 11 for electrolytic treatment, and ferrous ions and hydrogen peroxide can be produced through electrochemical action. Such a setting can effectively utilize the ferrous ions produced in the internal electrolysis process, reduce the amount of Fenton reagent added in the subsequent Fenton process, and promote the progress of the Fenton reaction, thereby improving the treatment efficiency of wastewater. In addition, the Fenton reaction process can produce ferric hydroxide, and the precipitation of ferric hydroxide has a coagulation effect, which can replace the addition of part of the coagulant in the subsequent coagulation and precipitation stage.

[0087] See also Figure 1 In one embodiment, the oxidation device 1 is provided with at least a Fenton reaction tank 12, and a stirrer 13 is provided in the Fenton reaction tank 12. Such a configuration can improve the uniform mixing of wastewater and substances such as Fenton reagent in the Fenton reaction tank 12, thereby improving the wastewater treatment effect.

[0088] See also Figure 1 In one embodiment, the oxidation device 1 is provided with at least an electrolytic cell 11 , and an electrolytic filler 111 is provided in the electrolytic cell 11 .

[0089] Among them, the electrolytic filler 111 in the electrolytic cell 11 can be distributed on the electrolytic bed, and the electrolytic filler 111 can be an iron-carbon electrolytic filler 111. In acidic wastewater, under the catalysis of the iron-carbon filler GL catalyst, countless micro-current reactors are formed between iron and carbon, and a potential difference is formed in the wastewater, so that the organic matter in the wastewater is reduced and oxidized under the action of micro-current, thereby disconnecting the macromolecular organic matter, which can effectively reduce the COD value, and the generated ferrous ions can destroy the chromophore groups of some organic matter, decolorize and clarify the wastewater, and improve the water quality of the effluent.

[0090] See also Figure 1 In one embodiment, the oxidation device 1 further includes a drug feeding device, which is connected to the electrolytic cell 11 and is used to adjust the pH value of the wastewater in the electrolytic cell 11.

[0091] In this embodiment, sulfuric acid or other acid-base regulators can be added to the electrolytic cell 11 through the drug feeding device to adjust the pH value in the electrolytic cell 11 to an appropriate range. For example, in the embodiment of the present application, the oxidation reaction needs to be carried out in an acidic wastewater environment. Sulfuric acid can be injected through the drug feeding device to adjust the pH value of the wastewater to no more than 3.5, which is beneficial to improve the reaction rate and reaction effect.

[0092] See also Figure 1 In one embodiment, the oxidation device 1 further includes a first aeration pipe 14 , which is inserted into the cavity of the oxidation device 1 .

[0093] In this embodiment, by inserting the first aeration pipe 14 into the oxidation device 1, a plurality of air outlets 314 are provided on the first aeration pipe 14, and the first aeration pipe 14 is connected to the blast device, air or oxygen can be introduced into the cavity for carrying wastewater in the oxidation device 1, so that the oxygen content in the wastewater is sufficient, ensuring the stable progress of the oxidation reaction, and avoiding the oxidation treatment effect of the wastewater affected by insufficient oxygen. Among them, when the oxidation device 1 is an electrolytic cell 11, the first aeration pipe 14 is inserted into the electrolytic cell 11; when the oxidation device 1 is a Fenton reaction tank 12, the first aeration pipe 14 is inserted into the Fenton reaction tank 12; when the oxidation device 1 includes the electrolytic cell 11 and the Fenton reaction tank 12, the first aeration pipe 14 can be inserted into at least one of the electrolytic cell 11 and the Fenton reaction tank 12; of course, the oxidation device 1 can also be other structures, and it is only necessary to insert the first aeration pipe 14 into the cavity for holding wastewater in the oxidation device 1.

[0094] See also Figure 1 In one embodiment, at least one of an inclined plate packing 24 and an inclined tube packing is provided in the packing area 22 .

[0095] In the embodiment of the present application, the coagulation sedimentation tank 2 is separated by a partition into a coagulation sedimentation area 21 and a filling area 22 which are interconnected at the bottom. Water flows from the coagulation sedimentation area 21 to the filling area 22 and then is discharged from the outlet. In the filling area 22, water flows upward from the bottom; inclined plate fillers 24 and inclined tube fillers are arranged in the filling area 22, which will make the water flow upward at a certain angle to the inclined plate or the inclined tube, while the flocculation particles to be precipitated rely on gravity to settle downward, which causes the direction of water flow to be opposite to the direction of movement of the flocculation particles, and can extend the flow path, increase the time for the particles to reach the inclined plate, greatly reduce the efficiency of the sedimentation tank, and improve the sedimentation effect; and the arrangement of inclined plates and / or inclined tubes can extend the flow path and flow time of the wastewater while increasing the volume of the device.

[0096] See also Figure 1 In one embodiment, a first mud discharge port 23 is provided at the bottom of the coagulation sedimentation tank 2; this arrangement makes it easy to clean the sludge in the coagulation sedimentation tank 2, and the sludge can be cleaned during the wastewater treatment process, thereby preventing the amount of sludge in the coagulation sedimentation tank 2 from increasing continuously as the wastewater treatment process continues. A blocking structure can be provided on the first mud discharge port 23 to control the opening and closing and the degree of opening of the first mud discharge port 23. In addition, in some embodiments, at least two first mud discharge ports 23 can be provided at the bottom of the coagulation sedimentation tank 2, so that the sludge can be dispersedly discharged from different first mud discharge ports 23, thereby improving the sludge discharge efficiency and avoiding excessive load on a single first mud discharge port 23.

[0097] See also Figure 1In one embodiment, the cross section of at least a portion of the bottom of the coagulation sedimentation tank 2 gradually decreases from top to bottom. This arrangement allows at least a portion of the inner wall of the bottom of the coagulation sedimentation tank 2 to form an inclined surface, which is conducive to the precipitated sludge to gather along the inclined surface at the bottom of the coagulation sedimentation tank 2. In addition, in some embodiments, a first mud discharge port 23 is provided at the bottom of the coagulation sedimentation tank 2, and the inclined surface can also guide the sludge to flow to the first mud discharge port 23 for discharge.

[0098] See also Figure 2 In one embodiment, the upflow anaerobic sludge blanket 3 comprises:

[0099] A reaction container 31, wherein a reaction zone 311, a precipitation zone 312 and a gas-liquid separation zone 313 are sequentially arranged in the reaction container 31 from bottom to top along the height direction, the bottom of the reaction container 31 is connected to the water outlet of the coagulation sedimentation tank 2, and the top of the reaction container 31 is provided with an air outlet 314 and a water outlet connected to the gas-liquid separation zone 313, and the air outlet 314 is higher than the water outlet of the reaction container 31; and

[0100] The three-phase separator 32 is disposed in the sedimentation zone 312 .

[0101] In this embodiment, the upflow anaerobic sludge blanket 3 includes a reaction vessel 31, and a reaction zone 311, a sedimentation zone 312 and a gas-liquid separation zone 313 are formed in the reaction vessel 31; when the wastewater enters the reaction vessel 31 from the water inlet at the bottom of the reaction vessel 31, it first passes through the reaction zone 311, which is provided with a sludge layer, and the sludge layer mainly concentrates the granular sludge of most highly active microorganisms. The wastewater enters the reaction vessel 31 from the bottom water inlet of the reaction vessel 31 and passes through the sludge layer, so that at least part of the organic matter in the wastewater is decomposed by the microorganisms in the sludge, so that the organic matter is further chain-broken and degraded. In this process Gases such as biogas will be produced. The biogas can flow upward with the water flow, and then be discharged from the gas outlet 314 at the top of the reaction container 31 and collected. In the process of the water flow and gas flowing upward, part of the sludge will also be driven upward. At this time, a sludge suspension area is formed above the sludge layer. The sludge suspension area is an area where flocculent sludge is concentrated. The sludge concentration in the sludge suspension area is lower than that in the sludge layer. It is generally non-granular sludge, and its sedimentation rate is significantly lower than that of granular sludge. The bubbles rising from the sludge layer make this layer of sludge well mixed, and some organic matter decomposition will also occur in the sludge suspension area.

[0102] A three-phase separator 32 is provided in the sedimentation zone 312. The three-phase separator 32 can separate the methane and other gases generated in the reaction process, the sludge rising with the water flow, and the treated wastewater, and can make the solid particles (mainly the flocculent sludge in the sludge suspension layer) flowing upward with the rising water flow due to the entrainment of the water flow settle in the sedimentation zone 312, and slide down along the inclined wall at the bottom of the sedimentation zone 312 and return to the reaction zone 311 (including the sludge layer and the sludge suspension layer) to ensure that the sludge in the reactor does not flow away and at the same time ensure the concentration of the sludge in the sludge bed. It is prevented that a large amount of sludge flows away with the water flow, resulting in a decrease in the sludge concentration in the reaction zone 311, which affects the treatment effect of the upflow anaerobic sludge bed 3 on the sludge.

[0103] The gas and liquid separated by the three-phase separator 32 are discharged from the gas outlet 314 and the water outlet in the gas-liquid separation zone 313, respectively. Most of the gas discharged from the gas outlet 314 is biogas, which can be collected and reused. The gas outlet 314 is higher than the water outlet, so that the liquid treated by the upflow anaerobic sludge blanket 3 can be prevented from being directly discharged from the gas outlet 314, so as to avoid leakage at the gas outlet 314 when the wastewater has not yet reached the discharge requirements.

[0104] Combined with reference Figure 2 and Figure 3 In one embodiment, an insertion port 319 is provided at the bottom of the reaction container 31, and the upflow anaerobic sludge blanket 3 also includes a water distributor 33, which is inserted into the reaction container 31 from the insertion port 319, and one end of the water distributor 33 located outside the reaction container 31 is connected to the water outlet of the coagulation sedimentation tank 2.

[0105] It is understandable that if a water inlet is directly opened at the bottom of the reaction container 31, since the water inlet is located at the bottom of the reaction container 31, the water inlet will be covered by sludge and affect the water inlet. In this embodiment, a water distributor 33 is inserted into the reaction container 31 from the insertion port 319 at the bottom of the reaction container 31; and the discharge port 333 on the water distributor 33 is required to be substantially higher than the sludge layer in the reaction zone 311, so as to avoid the sludge layer in the reaction container 31 affecting the wastewater from entering the upflow anaerobic sludge bed 3.

[0106] See also Figure 2 and Figure 4 In one embodiment, the water distributor 33 comprises:

[0107] A connecting section 331, the connecting section 331 is passed through the insertion port 319, and the connecting section 331 is communicated with the water outlet of the coagulation sedimentation tank 2; and

[0108] At least one water outlet section 332 is located in the reaction container 31 and connected to the connecting section 331 . The water outlet section 332 extends from the connecting section 331 to the side of the connecting section 331 . The water outlet section 332 is provided with a plurality of discharge ports 333 .

[0109] In this embodiment, the water distributor 33 includes a connecting section 331 and a water outlet section 332, one end of the connecting section 331 is inserted into the reaction container 31 from the insertion port 319 at the bottom of the reaction container 31, and is located at the height of the sludge layer; the end of the connecting section 331 located outside the reaction container 31 is connected to the water outlet of the coagulation sedimentation tank 2 through the water inlet pipe; the water outlet section 332 is connected to the end of the connecting section 331 inserted in the reaction container 31, and extends from the connecting section 331 to the side of the connecting section 331, and a plurality of water distribution holes are opened on the side wall of the water outlet section 332. In this way, when the wastewater enters the upflow sludge reaction bed through the water distributor 33, it will enter the water outlet section 332 through the connecting section 331, and then enter the sludge layer from the plurality of water distribution holes on the water outlet section 332, so that the wastewater is evenly discharged into different positions of the reaction container 31 and evenly and fully mixed with the sludge in the sludge layer, thereby improving the treatment effect of the wastewater. The water outlet section 332 may extend horizontally along the cross section of the reaction container 31 to the side of the connecting section 331 , or may extend obliquely upward, which is not limited here.

[0110] Combined with reference Figure 2 and Figure 4 In one embodiment, the discharge port 333 is arranged toward the bottom wall of the reaction container 31; this arrangement is conducive to the wastewater entering the reaction container 31 and the sludge at the bottom of the reaction zone 311 to be fully mixed and contacted, and the water flow discharged from the water distributor 33 is opposite to the direction of the rising water flow and air flow, which can flush the suspended sludge and other materials in the rising water flow and air flow downward to make the suspended sludge fall back into the sludge layer, thereby avoiding the reduction of sludge concentration in the reaction zone 311 and affecting the treatment effect of the upflow anaerobic sludge bed 3 on the sludge.

[0111] See also Figure 4 In one embodiment, at least part of the connecting section 331 in the reaction container 31 extends along the cross-sectional direction of the reaction container 31, and at least two water outlet sections 332 are arranged side by side along the extending direction of the connecting section 331;

[0112] And / or, at least two water outlet sections 332 are respectively disposed on both sides of the connecting section 331 .

[0113] In this embodiment, at least two water outlet sections 332 can be set, and each water outlet section 332 is connected to the connecting section 331, so that the part of the connecting section 331 located in the reaction vessel 31 has a certain length on the cross section of the reaction vessel 31; at least two of the water outlet sections 332 can be arranged along the length direction of the connecting section 331, or at least two of the water outlet sections 332 can be respectively located on both sides of the connecting section 331; in this way, more water outlet sections 332 can be set to extend to different areas at the bottom of the reaction vessel 31.

[0114] See also Figure 2 In one embodiment, a second mud discharge port 318 is also provided at the bottom of the reaction vessel 31. It is understandable that in the upflow anaerobic sludge bed 3, the sludge layer at the bottom is the main degradation site of organic matter, and in the process of the upflow anaerobic sludge bed 3 continuously treating wastewater, there will also be sludge precipitation, resulting in an increase in the amount of sludge in the sludge layer. If the sludge content in the sludge layer is excessive, the effective volume will be reduced due to sludge precipitation, thereby reducing the treatment efficiency, and even affecting normal operation due to blockage, or causing a large amount of sludge to be entrained in the effluent, affecting the effluent water quality. Therefore, the anaerobic reactor must be regularly discharged in an appropriate amount of sludge. By providing a second mud discharge port 318 at the bottom of the reaction vessel 31, the sludge layer at the bottom of the reaction vessel 31 can be cleaned regularly according to demand to avoid excessive sludge in the sludge layer.

[0115] See also Figure 1 and Figure 2 In one embodiment, the coagulation sedimentation tank 2 is connected to the water inlet of the reaction container 31 through a first water inlet pipe 35, and the reaction container 31 is provided with a first diversion port 315 connected to the gas-liquid separation zone 313; the upflow anaerobic sludge bed 3 is also provided with a first circulation pipeline 36 and a first circulation water pump 37, the first circulation pipeline 36 connects the first diversion port 315 and the first water inlet pipe 35, and the first circulation water pump 37 is arranged in the first circulation pipeline 36, which is used to introduce part of the liquid in the gas-liquid separation zone 313 into the first water inlet pipe 35.

[0116] In this embodiment, the coagulation sedimentation tank 2 and the upflow anaerobic sludge bed 3 are connected through the first water inlet pipe 35. The side wall of the reaction container 31 is provided with a first guide port 315 connected to the gas-liquid separation zone 313; and a first circulation pipeline 36 is provided, so that one end of the first circulation pipeline 36 is connected to the first guide port 315, and the other end of the first circulation pipeline 36 is connected to the first water inlet pipe 35, and a first circulation water pump 37 is provided to provide power, so that the supernatant in the gas-liquid separation zone 313 flows into the first water inlet pipe 35 through the first guide port 315 and the first circulation pipeline 36 in turn, and flows into the coagulation sedimentation tank 2 and the upflow anaerobic sludge bed 313. The wastewater discharged from the sedimentation tank 2 into the first water inlet pipe 35 is mixed. It can be understood that since the supernatant flowing into the first circulation pipeline 36 from the first diversion port 315 has been partially degraded and treated in the upflow anaerobic sludge bed 3 to reduce the content of organic matter therein, when the supernatant is mixed with the wastewater in the first water inlet pipe 35 for dilution, the concentration of the wastewater in the first water inlet pipe 35 is reduced, thereby avoiding the high concentration of organic matter in the wastewater flowing into the upflow anaerobic sludge bed 3, resulting in poor treatment effect of the wastewater in the reaction zone 311, thereby reducing the load of the upflow anaerobic sludge bed 3 in treating wastewater.

[0117] See also Figure 2 In one embodiment, the reaction zone 311 includes a sludge zone 3111 located at the bottom of the reaction container 31 and a suspended filler zone 3112 located above the sludge zone 3111 .

[0118] As the wastewater gradually enters the upflow anaerobic sludge bed 3 from the bottom water inlet, the water flow and the gas generated by the decomposition of organic matter will flow from bottom to top. In this process, the air flow and water flow will also drive part of the sludge to flow upward. In this embodiment, a suspended filler area 3112 is set above the sludge layer. The suspended filler 34 can block at least part of the sludge from continuing to flow upward, forming a sludge suspension area above the sludge layer. The sludge suspension area is an area where flocculent sludge is concentrated. The sludge concentration therein is lower than that of the sludge layer. It is generally non-granular sludge, and its sedimentation rate is significantly lower than that of granular sludge. The bubbles rising from the sludge layer make this layer of sludge well mixed. In this way, the suspended filler area 3112 can reduce the loss of sludge, and the suspended filler 34 can provide an area for microbial attachment and production, so that part of the organic matter decomposition can also occur in the suspended filler area 3112, which is beneficial to improving the wastewater treatment effect.

[0119] See also Figure 2 In one embodiment, the reaction container 31 also includes a first overflow groove 317 arranged on the outside of the gas-liquid separation zone 313, and the side wall of the gas-liquid separation zone 313 is provided with a first overflow port 316 connected to the first overflow groove 317. The first overflow port 316 is located below the gas outlet 314, and the groove wall of the first overflow groove 317 is provided with a water outlet of the reaction container 31.

[0120] With such a configuration, when the water level in the gas-liquid separation zone 313 reaches the first overflow port 316, the water will be discharged from the first overflow port 316 and flow into the first overflow trough 317, and then discharged from the water outlet opened on the trough wall of the first overflow trough 317; the water level in the gas-liquid separation zone 313 can be controlled, and the problem of wastewater leakage caused by the water flow being discharged from the gas outlet 314 can be avoided. Among them, at least two first overflow ports 316 can be opened along the circumference of the reaction container 31, and the first overflow trough 317 can extend along at least part of the circumference of the reaction container 31 to receive the water flowing out of the first overflow port 316.

[0121] See also Figure 2 In one embodiment, the cross section of at least a portion of the bottom of the reaction container 31 gradually decreases from top to bottom. In this way, the reaction container 31 is roughly configured as a cone structure, and a portion of the inner wall at the bottom of the reaction container 31 is configured to be inclined, which is conducive to further flocculation and precipitation of sludge flocs so that the sludge particles settle to the bottom of the reaction zone 311, so that the sludge at the bottom of the reaction zone 311 has a higher concentration and achieves a better wastewater treatment effect.

[0122] See also Figure 2 In one embodiment, a second mud discharge port 318 is opened at the bottom of the reaction container 31 .

[0123] Such a configuration facilitates the cleaning of the sludge in the reaction vessel 31, and some of the sludge can be removed during the wastewater treatment process, so as to avoid the wastewater from entering the reaction vessel 31 and affecting the normal operation of the device as the sludge content in the reaction zone 311 continues to increase during the reaction process. Among them, a blocking structure can be set on the second mud discharge port 318 to control the opening and closing and the opening degree of the second mud discharge port 318. In addition, in some embodiments, at least two second mud discharge ports 318 can be opened at the bottom of the reaction vessel 31, so that the sludge can be dispersedly discharged from different second mud discharge ports 318, thereby improving the sludge discharge efficiency and avoiding excessive load on a single second mud discharge port 318.

[0124] See also Figure 1 In one embodiment, the anaerobic-aerobic treatment device 4 includes an anoxic tank 41 and an aerobic tank 42 which are connected in sequence, and the water inlet of the anoxic tank 41 is connected to the water outlet of the upflow anaerobic sludge blanket 3.

[0125] In this embodiment, the anaerobic-aerobic treatment device 4 includes an anoxic tank 41 and an aerobic tank 42 which are connected in sequence. The anoxic tank 41 is connected to the outlet of the upflow anaerobic sludge tank, so that the wastewater first enters the anoxic tank 41, mixes with nitrifying bacteria, performs denitrification reaction, reduces nitrate nitrogen to nitrogen gas, and further degrades organic matter. The wastewater after the anoxic tank 41 enters the aerobic tank 42, in which the organic matter and ammonia nitrogen in the wastewater are effectively degraded and removed under the action of aerobic microorganisms, and precipitates to form sludge, and the supernatant in the aerobic tank 42 can be discharged into the adsorption filter device 5 to further filter and remove pollutants in the water.

[0126] See also Figure 1 In one embodiment, the anaerobic-aerobic treatment device 4 further includes a second aeration pipe 43 , which is inserted into the aerobic tank 42 and communicated with the aerobic tank 42 .

[0127] In the embodiment of the present application, after the wastewater after various treatments enters the aerobic tank 42 of the anaerobic-aerobic treatment device 4, the organic matter and ammonia nitrogen and other substances in the wastewater are degraded and removed by aerobic microorganisms in the aerobic tank 42. In the present embodiment, a second aeration pipe 43 is provided and inserted into the bottom of the aerobic tank 42, and the second aeration pipe 43 is connected to the blower device, and air or oxygen can be discharged into the aerobic tank 42 through the second aeration pipe 43 to increase the oxygen concentration in the aerobic tank 42, which is conducive to improving the activity of aerobic microorganisms, so that the organic matter and ammonia nitrogen in the wastewater are effectively degraded and removed under the action of aerobic microorganisms, thereby improving the treatment efficiency and treatment effect of the wastewater.

[0128] See also Figure 1 In one embodiment, the anaerobic-aerobic treatment device 4 further includes a sludge return pipe 44 , one end of which extends to the bottom of the aerobic tank 42 , and the other end of the sludge return pipe 44 is inserted into the anoxic tank 41 .

[0129] In this embodiment, a sludge return pipe 44 is provided between the anoxic tank 41 and the aerobic tank 42, one end of the sludge return pipe 44 is inserted into the bottom of the aerobic tank 42, and the other end is inserted into the anoxic tank 41, so that at least part of the sludge in the aerobic tank 42 can be returned to the anoxic tank 41. Specifically, the aerobic tank 42 mainly functions to remove COD, nitrify, and absorb phosphorus. In the aerobic tank 42, since the sludge absorbs phosphorus in the wastewater, the phosphorus content of the sludge is relatively high at this time; by returning part of the sludge to the anoxic tank 41 through the sludge return pipe 44, the microorganisms required for denitrification can be provided to the anoxic tank 41; and the sludge in the aerobic tank 42 can be reduced to avoid a large increase in the sludge in the aerobic tank 42.

[0130] See also Figure 1In one embodiment, a filler is provided in the anoxic tank 41 of the anaerobic-aerobic treatment device 4. The filler is usually made of plastic, but can also be other materials, such as ceramics or volcanic rocks. The setting of the filler is conducive to increasing the attachment area of ​​microorganisms in the anoxic tank 41, thereby increasing the content of microorganisms in the anoxic tank 41, and increasing the growth rate and oxidation reaction rate of microorganisms, thereby effectively increasing the reaction rate and accelerating the wastewater treatment speed.

[0131] In one embodiment, the filler is an elastic filler 411; the elastic filler 411 has a large surface area and porosity, which can improve the pollutant treatment efficiency of the anoxic tank 41. The softness of the elastic filler 411 can reduce the impact and wear of the suspended sludge and microorganisms on the filler, and extend the service life of the filler.

[0132] See also Figure 1 In one embodiment, at least two packing beds 412 are arranged in sequence along the cross-sectional direction of the anoxic pool 41, and at least one of the packing beds 412 is provided with packing.

[0133] In the present embodiment, at least two packing beds 412 arranged side by side are provided in the anoxic tank 41, and the packing beds 412 can be used to place packing; wherein, packing can be provided on only one or part of the packing beds 412, and by using at least two packing beds 412 arranged side by side to provide packing, the microbial content in the anoxic tank 41 can be fully increased while the distribution of microorganisms in the anoxic tank 41 can be made relatively uniform, thereby improving the wastewater treatment effect in the anoxic tank 41.

[0134] See also Figure 1 In one embodiment, the wastewater treatment system 100 further includes an adsorption filtration device 5 , which is connected to the water outlet of the anaerobic-aerobic treatment device 4 .

[0135] The adsorption filtration device 5 includes a filter container 51 and a filter material disposed in the filter container 51. The filter material may be an activated carbon filler 53 or an exchange resin. In the filter container 51, the flow direction of the water flow may be horizontal, top-down or bottom-up, or other flow channel structures may be provided to guide the flow of the water flow, which is not limited here. The provision of the adsorption filtration device 5 can further remove at least part of the organic matter that has not been removed from the wastewater after the front-end treatment, especially reducing substances such as organic matter that is difficult to biodegrade, and if there are pollutants such as heavy metals in the wastewater, at least part of them can also be removed by adsorption filtration, thereby improving the treatment effect of the wastewater.

[0136] See also Figure 1In one embodiment, the adsorption filtration device 5 includes a filtration container 51 and an adsorption bed 52 , wherein the water inlet and the water outlet of the filtration container 51 are spaced apart from bottom to top; the adsorption bed 52 is spaced between the water inlet and the water outlet of the filtration container 51 .

[0137] In this embodiment, wastewater enters the adsorption filter device 5 from the water inlet at the bottom of the adsorption filter device 5, and then passes through the adsorption bed 52 in the adsorption filter device 5. The adsorption bed 52 is provided with filter material and other filter fillers, so that at least part of the pollutants in the wastewater entering the adsorption filter device 5 are adsorbed by the filter fillers in the adsorption bed 52, thereby reducing the content of pollutants in the wastewater flowing above the adsorption bed 52. By making the wastewater flow from bottom to top, some impurities with relatively large particles can be precipitated first, thereby avoiding the problem that the upper surface of the adsorption bed 52 is easily blocked by impurities when the filtration method of water flowing downward is adopted, and because the water enters from bottom to top, the water flow speed is relatively slow, so that the impurities in the water are fully adsorbed by the adsorption bed 52, thereby improving the treatment effect.

[0138] See also Figure 1 In one embodiment, the anaerobic-aerobic treatment device 4 is connected to the water inlet of the filter container 51 through a second water inlet pipe 54, and the filter container 51 is provided with a second guide port 511 connected to the space above the adsorption bed 52; the adsorption filtration device 5 is also provided with a second circulation pipeline 55 and a second circulation water pump 56, the second circulation pipeline 55 connects the second guide port 511 and the second water inlet pipe 54, and the second circulation water pump 56 is arranged in the second circulation pipeline 55, and is used to introduce part of the liquid in the space above the adsorption bed 52 into the second water inlet pipe 54.

[0139] In this embodiment, the anaerobic-aerobic treatment device 4 and the filtration adsorption device are connected through a second water inlet pipe 54, and a second flow guide port 511 connected to the space above the adsorption bed 52 is provided on the side wall of the filtration container 51; and a second circulation pipeline 55 is provided, so that one end of the second circulation pipeline 55 is connected to the second flow guide port 511, and the other end of the second circulation pipeline 55 is connected to the second water inlet pipe 54, and a second circulation water pump 56 is provided to provide power, so that the supernatant in the space above the adsorption bed 52 flows into the second water inlet pipe 54 through the second flow guide port 511 and the second circulation pipeline 55 in sequence. Mixed with the wastewater discharged into the second water inlet pipe 54 from the anaerobic-aerobic treatment device 4, it can be understood that since the supernatant flowing into the second circulation pipeline 55 from the second guide port 511 has been partially adsorbed by the adsorption bed 52 in the adsorption filter device 5, thereby reducing the content of pollutants therein, therefore, when the supernatant is mixed with the wastewater in the second water inlet pipe 54 for dilution, the concentration of the wastewater in the second water inlet pipe 54 is reduced, thereby avoiding a high concentration of pollutants in the wastewater flowing into the adsorption filter device 5, resulting in poor filtering treatment effect of the wastewater, and reducing the load of the adsorption filter device 5 on treating wastewater.

[0140] See also Figure 1 In one embodiment, an activated carbon filler 53 is provided in the adsorption bed 52; the activated carbon filler 53 has a large specific surface area and can effectively adsorb organic substances in the wastewater, especially organic pollutants that are difficult to biodegrade. In addition, the activated carbon filler 53 adsorption bed 52 also has good decolorization and odor removal effects, which can further improve the water quality of the treated wastewater.

[0141] See also Figure 1 In one embodiment, a third mud discharge port 514 is opened at the bottom of the filter container 51 .

[0142] This arrangement makes it easy to clean the sludge in the filter container 51, and can remove part of the sludge during the wastewater treatment process, so as to avoid the sludge content in the filter container 51 from continuously increasing as the wastewater treatment process continues, thereby affecting the normal operation of the device. Among them, a blocking structure can be set on the third mud discharge port 514 to control the opening and closing and the opening degree of the third mud discharge port 514. In addition, in some embodiments, at least two third mud discharge ports 514 can be opened at the bottom of the filter container 51, so that the sludge can be dispersedly discharged from different third mud discharge ports 514, thereby improving the sludge discharge efficiency and avoiding excessive load on a single third mud discharge port 514.

[0143] See also Figure 1 In one embodiment, the cross-section of at least a portion of the bottom of the filter container 51 gradually decreases from top to bottom.

[0144] In this embodiment, at least part of the bottom structure of the filter container 51 is set as a cone structure. At this time, at least part of the inner wall of the bottom of the filter container 51 forms an inclined surface, which is conducive to the sludge particles settling to the bottom of the filter container 51 along the inclined surface.

[0145] See also Figure 1 In one embodiment, the filter container 51 also includes a second overflow groove 513 arranged on the outside of the filter container 51, and the side wall of the filter container 51 is provided with a second overflow port 512 connecting the second overflow groove 513 and the space above the adsorption bed 52, and the groove wall of the second overflow groove 513 is provided with a water outlet of the filter container 51.

[0146] In this way, when the water level in the filter container 51 reaches the second overflow port 512, the water will be discharged from the second overflow port 512 to flow into the second overflow groove 513, and then discharged from the water outlet opened on the groove wall of the second overflow groove 513; the water level in the filter container 51 can be controlled to control the flow rate of the adsorption filter device 5. Among them, at least two second overflow ports 512 can be opened along the circumference of the filter container 51, and the second overflow groove 513 can extend along at least part of the circumference of the filter container 51 to receive the water flowing out of the second overflow port 512.

[0147] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A wastewater treatment system, characterized in that: It includes an oxidation device, a coagulation sedimentation tank, an upflow anaerobic sludge bed and an anaerobic-aerobic treatment device which are connected in sequence; The coagulation sedimentation tank is provided with a partition, which divides the coagulation sedimentation tank into a coagulation sedimentation area and a filling area which are connected at the bottom, the water inlet of the coagulation sedimentation tank is connected to the coagulation sedimentation area, and the water outlet of the coagulation sedimentation tank is connected to the filling area; The wastewater treatment system further comprises an adsorption filtration device, which comprises a filtration container, an adsorption bed, a second circulation pipeline and a second circulation water pump, wherein the water inlet and the water outlet of the filtration container are arranged at intervals from bottom to top, and the adsorption bed is arranged between the water inlet and the water outlet of the filtration container; The anaerobic-aerobic treatment device is connected to the water inlet of the filter container through a second water inlet pipe, the filter container is provided with a second flow guide port connected to the space above the adsorption bed, the second circulation pipeline is connected to the second flow guide port and the second water inlet pipe, and the second circulation water pump is provided in the second circulation pipeline for introducing part of the liquid in the space above the adsorption bed into the second water inlet pipe; The upflow anaerobic sludge blanket comprises a reaction container, a three-phase separator and a water distributor. The reaction container is provided with a reaction zone, a sedimentation zone and a gas-liquid separation zone in order from bottom to top along the height direction. The top of the reaction container is provided with a gas outlet and a water outlet connected to the gas-liquid separation zone, the gas outlet is higher than the water outlet of the reaction container, the three-phase separator is arranged in the sedimentation zone, and the reaction zone comprises a sludge zone and a suspended filler zone located above the sludge zone; The bottom of the reaction container is provided with an insertion port, the water distributor comprises a connecting section and at least two water outlet sections, the connecting section is inserted into the reaction container from the insertion port, and one end of the connecting section located outside the reaction container is connected to the water outlet of the coagulation sedimentation tank; The water outlet section extends from the connecting section to the side of the connecting section and extends obliquely from bottom to top. The water outlet section is higher than the sludge layer in the sludge area and has a plurality of discharge ports disposed toward the bottom wall of the reaction container. The coagulation sedimentation tank is connected to the reaction container via a first water inlet pipe, and the reaction container is provided with a first flow guide port connected to the gas-liquid separation zone; The upflow anaerobic sludge bed is also provided with a first circulation pipeline and a first circulation water pump. The first circulation pipeline connects the first diversion port and the first water inlet pipeline. The first circulation water pump is arranged in the first circulation pipeline and is used to introduce part of the liquid in the gas-liquid separation zone into the first water inlet pipeline.

2. The wastewater treatment system according to claim 1, characterized in that: The oxidation device includes at least one of an electrolytic cell and a Fenton reaction cell.

3. The wastewater treatment system according to claim 2, characterized in that: The oxidation device comprises the electrolytic cell and the Fenton reaction cell which are connected in sequence, the electrolytic cell is provided with a water inlet, and the water outlet of the Fenton reaction cell is connected with the coagulation sedimentation tank.

4. The wastewater treatment system according to claim 2, characterized in that: The oxidation device is at least provided with a Fenton reaction tank, and a stirrer is provided in the Fenton reaction tank.

5. The wastewater treatment system according to claim 2, characterized in that: The oxidation device is at least provided with an electrolytic cell, in which an electrolytic filler is provided.

6. The wastewater treatment system according to claim 2, characterized in that: The oxidation device is at least provided with an electrolytic cell, and the oxidation device also includes a drug feeding device, which is connected to the electrolytic cell and is used to adjust the pH value of the wastewater in the electrolytic cell.

7. The wastewater treatment system according to claim 1, characterized in that: The oxidation device further comprises a first aeration pipe, and the first aeration pipe is inserted into the cavity of the oxidation device.

8. The wastewater treatment system according to claim 1, characterized in that: At least one of an inclined plate packing and an inclined tube packing is arranged in the packing area.

9. The wastewater treatment system according to claim 1, characterized in that: A first mud discharge port is provided at the bottom of the coagulation sedimentation tank; And / or, the cross-section of at least a portion of the bottom of the coagulation sedimentation tank gradually decreases from top to bottom.

10. The wastewater treatment system according to claim 1, characterized in that: At least part of the connecting section located in the reaction container extends along the cross-sectional direction of the reaction container, and at least two of the water outlet sections are arranged side by side along the extending direction of the connecting section; And / or, at least two of the water outlet sections are respectively arranged on both sides of the connecting section.

11. The wastewater treatment system according to claim 1, characterized in that: The reaction container further comprises a first overflow groove arranged outside the gas-liquid separation zone, a first overflow port connected to the first overflow groove is opened on the side wall of the gas-liquid separation zone, the first overflow port is located below the gas outlet, and a water outlet of the reaction container is opened on the groove wall of the first overflow groove; And / or, the cross section of at least a portion of the bottom of the reaction container gradually decreases from top to bottom; And / or, a second mud discharge port is provided at the bottom of the reaction container.

12. The wastewater treatment system according to claim 1, characterized in that: The anaerobic-aerobic treatment device comprises an anoxic tank and an aerobic tank which are connected in sequence; Wherein, the anaerobic-aerobic treatment device further comprises a second aeration pipeline, which is inserted into the aerobic tank and communicated with the aerobic tank; And / or, the anaerobic-aerobic treatment device further comprises a sludge return pipe, one end of which extends to the bottom of the aerobic tank, and the other end of which is inserted into the anoxic tank.

13. The wastewater treatment system according to claim 1, characterized in that: The anoxic tank of the anaerobic-aerobic treatment device is provided with fillers.

14. The wastewater treatment system according to claim 13, characterized in that: The filler is an elastic filler; And / or, the anoxic tank is provided with at least two packing beds arranged in sequence along the cross-sectional direction of the anoxic tank, wherein at least one of the packing beds is provided with the packing.

15. The wastewater treatment system according to claim 1, characterized in that: The adsorption bed is provided with activated carbon filler; And / or, a third row of mud outlets is provided at the bottom of the filter container; and / or, the cross section of at least a portion of the bottom of the filtration container gradually decreases from top to bottom; And / or, the filter container further comprises a second overflow trough arranged outside the filter container, a side wall of the filter container is provided with a second overflow port connecting the second overflow trough and the space above the adsorption bed, and a trough wall of the second overflow trough is provided with a water outlet of the filter container.

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